阅读说明：本技术 一种柴油发电机组调速系统 (Speed regulating system of diesel generating set ) 是由 田业成 吴苏敏 龚嫚 朱文江 黄丹清 张�杰 刘顺兴 杨立树 于 2021-01-14 设计创作，主要内容包括：本发明实施例公开了一种柴油发电机组调速系统。所述系统包括第一测速传感器、第二测速传感器和调速器。第一柴油机与第二柴油机之间连接一发电机,第一柴油机和第二柴油机共同带动发电机转动；调速器分别与第一测速传感器、第二测速传感器、第一柴油机以及第二柴油机电连接；调速器根据第一测速传感器所采集的第一柴油机的实际转速、第二测速传感器所采集的第二柴油机的实际转速以及预设转速确定分配负荷信号,以及通过向第一柴油机和第二柴油机分别输出对应的分配负荷信号调节第一柴油机的转速和第二柴油机的转速以调节发电机的转速。本技术方案实现了对第一柴油机和第二柴油机的统一调控,进而保障了柴油发电机组运行的稳定性。(The embodiment of the invention discloses a speed regulating system of a diesel generating set. The system comprises a first speed measuring sensor, a second speed measuring sensor and a speed regulator. A generator is connected between the first diesel engine and the second diesel engine, and the first diesel engine and the second diesel engine drive the generator to rotate together; the speed regulator is respectively and electrically connected with the first speed measuring sensor, the second speed measuring sensor, the first diesel engine and the second diesel engine; the speed regulator determines a distribution load signal according to the actual rotating speed of the first diesel engine collected by the first speed measurement sensor, the actual rotating speed of the second diesel engine collected by the second speed measurement sensor and a preset rotating speed, and regulates the rotating speed of the first diesel engine and the rotating speed of the second diesel engine by respectively outputting corresponding distribution load signals to the first diesel engine and the second diesel engine so as to regulate the rotating speed of the generator. According to the technical scheme, the first diesel engine and the second diesel engine are uniformly regulated and controlled, and the running stability of the diesel generating set is further guaranteed.)

1. A diesel generating set speed control system, its characterized in that includes: the speed controller comprises a first speed measuring sensor, a second speed measuring sensor and a speed regulator;

the first speed measuring sensor is electrically connected with a first diesel engine, the second speed measuring sensor is electrically connected with a second diesel engine, a generator is connected between the first diesel engine and the second diesel engine, and the first diesel engine and the second diesel engine drive the generator to rotate together;

the speed regulator is respectively and electrically connected with the first speed measuring sensor, the second speed measuring sensor, the first diesel engine and the second diesel engine;

the speed regulator determines a distribution load signal according to the actual rotating speed of the first diesel engine collected by the first speed measurement sensor, the actual rotating speed of the second diesel engine collected by the second speed measurement sensor and a preset rotating speed, and regulates the rotating speed of the first diesel engine and the rotating speed of the second diesel engine by respectively outputting the corresponding distribution load signal to the first diesel engine and the second diesel engine so as to regulate the rotating speed of the generator.

2. The diesel-electric set governor system of claim 1, wherein the governor includes a controller, a first actuator, and a second actuator;

the controller is electrically connected with the first diesel engine through the first executing mechanism, and the first executing mechanism adjusts the rotating speed of the first diesel engine according to the corresponding load distribution signal;

the controller is electrically connected with the second diesel engine through the second actuating mechanism, and the second actuating mechanism adjusts the rotating speed of the second diesel engine according to the corresponding load distribution signal.

3. The diesel-electric set governor system of claim 2, wherein the first actuator comprises a first servo motor and the second actuator comprises a second servo motor;

the input end of the first servo motor is electrically connected with the controller, the output end of the first servo motor is electrically connected with the first diesel engine, and the first servo motor adjusts the rotating speed of the first diesel engine by adjusting the position of an accelerator rack of the first diesel engine according to the corresponding load distribution signal;

the input end of the second servo motor is electrically connected with the controller, the output end of the second servo motor is electrically connected with the second diesel engine, and the second servo motor adjusts the rotating speed of the second diesel engine by adjusting the position of an accelerator rack of the second diesel engine according to the corresponding load distribution signal.

4. The diesel-electric set governor system of claim 3, wherein the first servo motor comprises a first servo driver and a first servo actuator; the input end of the first servo driver is used as the input end of the first servo motor, the output end of the first servo driver is electrically connected with the input end of the first servo executing motor, and the output end of the first servo executing motor is used as the output end of the first servo motor;

the second servo motor comprises a second servo driver and a second servo executing motor; the input end of the second servo driver is used as the input end of the second servo motor, the output end of the second servo driver is electrically connected with the input end of the second servo actuator motor, and the output end of the second servo actuator motor is used as the output end of the second servo motor.

5. The diesel-electric set governor system of claim 2, wherein the controller includes a speed selection unit and a load distribution unit; the rotating speed selection unit is electrically connected with the first speed measurement sensor and the second speed measurement sensor respectively;

the rotating speed selection unit determines the actual rotating speed of the generator according to the actual rotating speed of the first diesel engine acquired by the first speed measurement sensor and the actual rotating speed of the second diesel engine acquired by the second speed measurement sensor, and determines an error rotating speed according to the actual rotating speed of the generator and the preset rotating speed;

the load distribution unit is electrically connected with the rotating speed selection unit, and the load distribution unit determines the distributed load signal according to the error rotating speed.

6. The diesel-electric set governor system of claim 5,

the rotating speed selection unit judges that if the actual rotating speed of the first diesel engine is larger than a normal rotating speed threshold value, the actual rotating speed of the second diesel engine is selected as the actual rotating speed of the generator; if the actual rotating speed of the second diesel engine is greater than the normal rotating speed threshold value, selecting the actual rotating speed of the first diesel engine as the actual rotating speed of the generator; if the actual rotating speed of the first diesel engine and the actual rotating speed of the second diesel engine are both greater than the normal rotating speed threshold value, the rotating speed selecting unit does not determine the error rotating speed;

if the actual rotating speed of the first diesel engine is greater than that of the second diesel engine, selecting the actual rotating speed of the first diesel engine as the actual rotating speed of the generator; if the actual rotational speed of the second diesel engine is greater than the actual rotational speed of the first diesel engine, then:

if the rotating speed selected at the last moment is the actual rotating speed of the first diesel engine, if the difference value between the actual rotating speed of the second diesel engine and the actual rotating speed of the first diesel engine is larger than a first allowable threshold value, selecting the actual rotating speed of the second diesel engine as the actual rotating speed of the generator, otherwise, selecting the actual rotating speed of the first diesel engine as the actual rotating speed of the generator; if the rotating speed selected at the last moment is the actual rotating speed of the second diesel engine, if the difference value between the actual rotating speed of the second diesel engine and the actual rotating speed of the first diesel engine is equal to or smaller than a second allowable threshold value, selecting the actual rotating speed of the first diesel engine as the actual rotating speed of the generator, and otherwise, selecting the actual rotating speed of the second diesel engine as the actual rotating speed of the generator.

7. The diesel-electric set speed regulating system of claim 1, further comprising a first rack position sensor and a second rack position sensor;

the first rack position sensor is connected to the first diesel engine, and the second rack position sensor is connected to the second diesel engine;

the speed regulator is electrically connected with the first rack position sensor and the second rack position sensor respectively; and the speed regulator respectively regulates the rotating speed of the first diesel engine to a target rotating speed and the rotating speed of the second diesel engine to the target rotating speed according to the actual load signal of the first diesel engine collected by the first rack position sensor, the actual load signal of the second diesel engine collected by the second rack position sensor and the distribution load signal.

8. The diesel-electric set governor system of claim 7, further comprising a first converter and a second converter;

the speed regulator is electrically connected with the first rack position sensor through the first converter, the first converter is used for converting an actual rack position signal of the first diesel engine, which is acquired by the first rack position sensor, into an actual load signal of the first diesel engine, and the actual load signal of the first diesel engine is a current signal;

the speed regulator is electrically connected with the second rack position sensor through the second converter, the second converter is used for converting an actual rack position signal of the second diesel engine, which is acquired by the second rack position sensor, into an actual load signal of the second diesel engine, and the actual load signal of the second diesel engine is a current signal.

9. The diesel-electric set speed regulating system of claim 1, further comprising: a first inverter and a second inverter;

the speed regulator is electrically connected with the first speed measuring sensor through the first converter, and the first converter is used for converting the actual rotating speed of the first diesel engine collected by the first speed measuring sensor into a corresponding current signal;

the speed regulator is electrically connected with the second speed measuring sensor through the second converter, and the second converter is used for converting the actual rotating speed of the second diesel engine collected by the second speed measuring sensor into a corresponding current signal.

10. The diesel-electric set governor system of claim 1, further comprising a first circuit breaker and a second circuit breaker;

the first circuit breaker is electrically connected with the first diesel engine, the first circuit breaker is electrically connected with the speed regulator, and the speed regulator judges whether the first diesel engine is in an island mode or a speed reduction mode according to a signal of the first circuit breaker;

the second circuit breaker is electrically connected with the second diesel engine, the second circuit breaker is electrically connected with the speed regulator, and the speed regulator judges that the second diesel engine is in an island mode or a speed reduction mode according to a signal of the second circuit breaker.

Technical Field

The embodiment of the invention relates to the technical field of electronic control of diesel generators, in particular to a speed regulating system of a diesel generator set.

Background

In the field of emergency power generation of nuclear power stations, in order to ensure the reliability of a diesel generating set, a 'two-in-one' power generation mode is often adopted. That is, two diesel engines are used to drive a generator together to generate electricity, wherein one diesel engine rotates clockwise and the other diesel engine rotates counterclockwise (the rotation direction is determined by the person facing the flywheel end). When a 'two-driving-one' power generation mode is adopted, higher requirements are put forward on the consistency of the operating conditions of the two diesel engines, and therefore higher requirements are put forward on the control performance of the speed regulating system of the diesel generating set.

At present, in a speed regulating system of a diesel generating set adopting a 'two-driving-one' power generation mode, a control strategy is that each diesel engine is provided with an independent controller and an actuator, and the working characteristics of the two diesel engines are basically consistent only by uniformly inputting a set rotating speed and a load signal. However, under the control strategy, if load disturbance occurs, the control effects of the two diesel engines are easily inconsistent because the two diesel engines are regulated and controlled by the independent controller and the independent actuator, so that the stable operation of the diesel generator set is influenced.

Disclosure of Invention

The embodiment of the invention provides a speed regulating system of a diesel generating set, which is used for realizing the unified regulation and control of two diesel engines through one speed regulator and ensuring the running stability of the diesel generating set.

The embodiment of the invention provides a speed regulating system of a diesel generating set, which comprises: the speed controller comprises a first speed measuring sensor, a second speed measuring sensor and a speed regulator;

the first speed measuring sensor is electrically connected with a first diesel engine, the second speed measuring sensor is electrically connected with a second diesel engine, a generator is connected between the first diesel engine and the second diesel engine, and the first diesel engine and the second diesel engine drive the generator to rotate together;

the speed regulator is respectively and electrically connected with the first speed measuring sensor, the second speed measuring sensor, the first diesel engine and the second diesel engine;

the speed regulator determines a distribution load signal according to the actual rotating speed of the first diesel engine collected by the first speed measurement sensor, the actual rotating speed of the second diesel engine collected by the second speed measurement sensor and a preset rotating speed, and regulates the rotating speed of the first diesel engine and the rotating speed of the second diesel engine by respectively outputting the corresponding distribution load signal to the first diesel engine and the second diesel engine so as to regulate the rotating speed of the generator.

Optionally, the governor includes a controller, a first actuator, and a second actuator;

the controller is electrically connected with the first diesel engine through the first executing mechanism, and the first executing mechanism adjusts the rotating speed of the first diesel engine according to the corresponding load distribution signal;

the controller is electrically connected with the second diesel engine through the second actuating mechanism, and the second actuating mechanism adjusts the rotating speed of the second diesel engine according to the corresponding load distribution signal.

Optionally, the first actuator comprises a first servo motor, and the second actuator comprises a second servo motor;

the input end of the first servo motor is electrically connected with the controller, the output end of the first servo motor is electrically connected with the first diesel engine, and the first servo motor adjusts the rotating speed of the first diesel engine by adjusting the position of an accelerator rack of the first diesel engine according to the corresponding load distribution signal;

the input end of the second servo motor is electrically connected with the controller, the output end of the second servo motor is electrically connected with the second diesel engine, and the second servo motor adjusts the rotating speed of the second diesel engine by adjusting the position of an accelerator rack of the second diesel engine according to the corresponding load distribution signal.

Optionally, the first servo motor comprises a first servo driver and a first servo actuator motor; the input end of the first servo driver is used as the input end of the first servo motor, the output end of the first servo driver is electrically connected with the input end of the first servo executing motor, and the output end of the first servo executing motor is used as the output end of the first servo motor;

the second servo motor comprises a second servo driver and a second servo executing motor; the input end of the second servo driver is used as the input end of the second servo motor, the output end of the second servo driver is electrically connected with the input end of the second servo actuator motor, and the output end of the second servo actuator motor is used as the output end of the second servo motor.

Optionally, the controller comprises a rotational speed selection unit and a load distribution unit; the rotating speed selection unit is electrically connected with the first speed measurement sensor and the second speed measurement sensor respectively;

the rotating speed selection unit determines the actual rotating speed of the generator according to the actual rotating speed of the first diesel engine acquired by the first speed measurement sensor and the actual rotating speed of the second diesel engine acquired by the second speed measurement sensor, and determines an error rotating speed according to the actual rotating speed of the generator and the preset rotating speed; the load distribution unit is electrically connected with the rotating speed selection unit, and the load distribution unit determines the distributed load signal according to the error rotating speed.

Optionally, the rotation speed selection unit determines that the actual rotation speed of the second diesel engine is selected as the actual rotation speed of the generator if the actual rotation speed of the first diesel engine is greater than a normal rotation speed threshold; if the actual rotating speed of the second diesel engine is greater than the normal rotating speed threshold value, selecting the actual rotating speed of the first diesel engine as the actual rotating speed of the generator; if the actual rotating speed of the first diesel engine and the actual rotating speed of the second diesel engine are both greater than the normal rotating speed threshold value, the rotating speed selecting unit does not determine the error rotating speed;

if the actual rotating speed of the first diesel engine is greater than that of the second diesel engine, selecting the actual rotating speed of the first diesel engine as the actual rotating speed of the generator; if the actual rotational speed of the second diesel engine is greater than the actual rotational speed of the first diesel engine, then:

if the rotating speed selected at the last moment is the actual rotating speed of the first diesel engine, if the difference value between the actual rotating speed of the second diesel engine and the actual rotating speed of the first diesel engine is larger than a first allowable threshold value, selecting the actual rotating speed of the second diesel engine as the actual rotating speed of the generator, otherwise, selecting the actual rotating speed of the first diesel engine as the actual rotating speed of the generator; if the rotating speed selected at the last moment is the actual rotating speed of the second diesel engine, if the difference value between the actual rotating speed of the second diesel engine and the actual rotating speed of the first diesel engine is equal to or smaller than a second allowable threshold value, selecting the actual rotating speed of the first diesel engine as the actual rotating speed of the generator, and otherwise, selecting the actual rotating speed of the second diesel engine as the actual rotating speed of the generator.

Optionally, a first rack position sensor and a second rack position sensor are further included;

the first rack position sensor is connected to the first diesel engine, and the second rack position sensor is connected to the second diesel engine;

the speed regulator is electrically connected with the first rack position sensor and the second rack position sensor respectively; and the speed regulator respectively regulates the rotating speed of the first diesel engine to a target rotating speed and the rotating speed of the second diesel engine to the target rotating speed according to the actual load signal of the first diesel engine collected by the first rack position sensor, the actual load signal of the second diesel engine collected by the second rack position sensor and the distribution load signal.

Optionally, a first converter and a second converter are also included;

the speed regulator is electrically connected with the first rack position sensor through the first converter, the first converter is used for converting an actual rack position signal of the first diesel engine, which is acquired by the first rack position sensor, into an actual load signal of the first diesel engine, and the actual load signal of the first diesel engine is a current signal;

the speed regulator is electrically connected with the second rack position sensor through the second converter, the second converter is used for converting an actual rack position signal of the second diesel engine, which is acquired by the second rack position sensor, into an actual load signal of the second diesel engine, and the actual load signal of the second diesel engine is a current signal.

Optionally, the method further comprises: a first inverter and a second inverter;

the speed regulator is electrically connected with the first speed measuring sensor through the first converter, and the first converter is used for converting the actual rotating speed of the first diesel engine collected by the first speed measuring sensor into a corresponding current signal;

the speed regulator is electrically connected with the second speed measuring sensor through the second converter, and the second converter is used for converting the actual rotating speed of the second diesel engine collected by the second speed measuring sensor into a corresponding current signal.

Optionally, a first circuit breaker and a second circuit breaker are also included;

the first circuit breaker is electrically connected with the first diesel engine, the first circuit breaker is electrically connected with the speed regulator, and the speed regulator judges whether the first diesel engine is in an island mode or a speed reduction mode according to a signal of the first circuit breaker;

the second circuit breaker is electrically connected with the second diesel engine, the second circuit breaker is electrically connected with the speed regulator, and the speed regulator judges that the second diesel engine is in an island mode or a speed reduction mode according to a signal of the second circuit breaker.

The speed regulating system of the diesel generating set provided by the embodiment of the invention regulates and controls the rotating speed of the diesel generating set only by the arranged speed regulator on the basis of respectively collecting the rotating speed of the first diesel engine by the first speed measuring sensor and collecting the rotating speed of the second diesel engine by the second speed measuring sensor, namely, the rotation speed of the first diesel engine and the rotation speed of the second diesel engine are regulated and controlled by only one speed regulator, the rotating speed of the generator is regulated, the problem that when load disturbance occurs, because the two diesel engines are regulated by the independent controller and the independent actuator because each existing diesel engine is provided with the independent controller and the independent actuator is solved, the control effect of the two diesel engines is easy to cause inconsistent technical problems, the uniform regulation and control of the first diesel engine and the second diesel engine are realized, and the running stability of the generator is ensured. Wherein, the distribution load signal is confirmed through the actual rotational speed of the first diesel engine that gathers according to first speed sensor, the actual rotational speed of the second diesel engine that second speed sensor gathered and predetermine the rotational speed to and adjust the rotational speed of first diesel engine and the rotational speed of second diesel engine in order to adjust the rotational speed of generator through the distribution load signal that outputs corresponding respectively to first diesel engine and second diesel engine, the unified regulation and control to first diesel engine and second diesel engine has been realized, and then the stability of diesel generating set operation has been ensured.

Drawings

FIG. 1 is a schematic structural diagram of a speed control system of a diesel generator set according to an embodiment of the invention;

FIG. 2 is a schematic structural diagram of another speed regulating system of a diesel generating set according to an embodiment of the invention;

FIG. 3 is a schematic structural diagram of another speed regulating system of a diesel generating set according to an embodiment of the invention;

FIG. 4 is a schematic structural diagram of another speed regulating system of a diesel generating set according to an embodiment of the invention;

fig. 5 is a schematic structural diagram of another speed regulating system of a diesel generator set according to an embodiment of the invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures. In addition, the descriptions of "first and second" appearing in the present embodiment are only for distinguishing technical features, and are not intended to limit the technical features.

The speed control system of the diesel generating set provided by the embodiment of the invention can be applied to a 'two-in-one' power generation mode in the field of emergency power generation of nuclear power stations, and fig. 1 is a schematic structural diagram of the speed control system of the diesel generating set provided by the embodiment of the invention, and referring to fig. 1, the system comprises: a first speed measuring sensor 20, a second speed measuring sensor 21 and a speed regulator 10.

The first speed measuring sensor 20 is electrically connected to the first diesel engine 100, the second speed measuring sensor 21 is electrically connected to the second diesel engine 200, a generator 300 is connected between the first diesel engine 100 and the second diesel engine 200, and the first diesel engine 100 and the second diesel engine 200 drive the generator 300 to rotate together; the speed regulator 10 is respectively electrically connected with a first speed measuring sensor 20, a second speed measuring sensor 21, a first diesel engine 100 and a second diesel engine 200; the governor 10 determines a distribution load signal according to the actual rotation speed of the first diesel engine 100 collected by the first speed sensor 20, the actual rotation speed of the second diesel engine 200 collected by the second speed sensor 21, and a preset rotation speed, and adjusts the rotation speed of the first diesel engine 100 and the rotation speed of the second diesel engine 200 by outputting corresponding distribution load signals to the first diesel engine 100 and the second diesel engine 200, respectively, to adjust the rotation speed of the generator 300.

In particular, the generator 300 may be connected between the first diesel engine 100 and the second diesel engine 200 by a coupling, such as an elastic rubber coupling. The first speed sensor 20 can collect the rotating speed of the first diesel engine 100, and the second speed sensor 21 can collect the rotating speed of the second diesel engine oil. The first tacho sensor 20 and the second tacho sensor 21 may be magnetic pulse type tacho sensors that enable sampling of the tacho signal by capturing the square wave frequency.

Under the normal condition, first diesel engine 100 and second diesel engine 200 all are operation under the rotational speed of predetermineeing, when the load disturbance appears, under the condition that two diesel engines are controlled alone, because the controller 11 of two diesel engines will be respectively according to predetermineeing the rotational speed and the size of load disturbance is regulated and control the diesel engine that corresponds, regulate and control so that two balanced same load disturbances of diesel engine according to the size of predetermineeing rotational speed and load disturbance to two diesel engines promptly alone, this kind of mode not only is not high to the balanced precision of load disturbance, and the control effect of two diesel engines is difficult unanimous, influence diesel generating set steady operation very easily.

In view of this, in the speed regulation system of the diesel generator set provided in the embodiment of the present invention, only one speed regulator 10 is provided to realize regulation and control of two diesel engines (the first diesel engine 100 and the second diesel engine 200). The governor 10 is an all-electric governor 10 that may include a microprocessor and a servo motor, for example, the governor 10 may include an EC-50N type controller. The governor 10 is electrically connected to the first speed sensor 20 and the second speed sensor 21, respectively, to acquire actual rotational speeds of the first diesel engine 100 and the second diesel engine 200, respectively. The governor 10 is electrically connected to the first diesel engine 100 and the second diesel engine 200, respectively, to output signals to the first diesel engine 100 and the second diesel engine 200, respectively, to regulate the first diesel engine 100 and the second diesel engine 200. The speed regulator 10 is preset and stored with a preset rotating speed, the preset rotating speed is set manually and can be modified as required, and the preset rotating speed can also be set according to the size of the steady-state speed regulation rate.

Under normal conditions, the governor 10 adjusts the rotation speed of the first diesel engine 100 to a preset rotation speed according to the actual rotation speed of the first diesel engine 100, so that the first diesel engine 100 maintains operation at the preset rotation speed, and adjusts the rotation speed of the second diesel engine 200 to a preset rotation speed according to the actual rotation speed of the second diesel engine 200, so that the second diesel engine 200 maintains operation at the preset rotation speed.

When a load disturbance occurs, for example, a load disturbance connected to the generator 300 or a load disturbance of one of the diesel engines occurs, the governor 10 determines a distributed load signal according to the actual rotational speed of the first diesel engine 100, the actual rotational speed of the second diesel engine 200, and a preset rotational speed, and adjusts the rotational speed of the first diesel engine 100 and the rotational speed of the second diesel engine 200 by outputting the corresponding distributed load signals to the first diesel engine 100 and the second diesel engine 200, respectively, to adjust the rotational speed of the generator 300. Namely, the speed governor 10 obtains the magnitude of load disturbance according to the actual rotational speed of the first diesel engine 100, the actual rotational speed of the second diesel engine 200 and the preset rotational speed, and determines the load distribution signals to the first diesel engine 100 and the second diesel engine 200 according to the magnitude of the obtained load disturbance, that is, the magnitude of load disturbance is distributed on the first diesel engine 100 and the second diesel engine 200, so as to adjust the rotational speed of the first diesel engine 100 and the rotational speed of the second diesel engine 200, which shows that the load disturbance received by the diesel generator 300 group is distributed to the two diesel engines according to the preset rotational speed and the actual rotational speeds of the two diesel engines, so that the two diesel engines uniformly balance the load disturbance, the control effects of the two diesel engines are consistent, and then the first diesel engine 100 and the second diesel engine 200 drive the generator 300 to rotate together, and finally shows that the rotational speed of the generator 300 is stabilized, the stability of the operation of the diesel generating set is guaranteed.

In summary, compared with the existing system for individually controlling two diesel engines according to the preset rotation speed and the load disturbance to balance the same load disturbance, the speed control system for a diesel generator set according to the embodiment of the present invention only controls the rotation speed of the diesel generator set 300 through the set speed controller 10 on the basis of collecting the rotation speed of the first diesel engine 100 by using the first speed sensor 20 and collecting the rotation speed of the second diesel engine 200 by using the second speed sensor 21. When load disturbance occurs, the speed regulator 10 distributes the load disturbance to the first diesel engine 100 and the second diesel engine 200 according to the actual rotating speed of the first diesel engine 100, the actual rotating speed of the second diesel engine 200 and the preset rotating speed, that is, the speed regulator 10 determines a distributed load signal according to the actual rotating speed of the first diesel engine 100, the actual rotating speed of the second diesel engine 200 and the preset rotating speed, and adjusts the rotating speed of the generator 300 by respectively outputting corresponding distributed load signals to the first diesel engine 100 and the second diesel engine 200 to adjust the rotating speed of the first diesel engine 100 and the rotating speed of the second diesel engine 200, so that the uniform balance of the two diesel engines on the occurring load disturbance is realized, the control effect consistency of the two diesel engines is realized, and the running stability of the diesel generator set is guaranteed.

Optionally, fig. 2 is a schematic structural diagram of another diesel generator set governor system according to an embodiment of the present invention, and referring to fig. 2, the governor 10 includes a controller 11, a first actuator 12, and a second actuator 13. The controller 11 is electrically connected with the first diesel engine 100 through the first actuating mechanism 12, and the first actuating mechanism 12 adjusts the rotating speed of the first diesel engine 100 according to the corresponding load distribution signal; the controller 11 is electrically connected to the second diesel engine 200 through the second actuator 13, and the second actuator 13 adjusts the rotation speed of the second diesel engine 200 according to the corresponding distributed load signal.

Specifically, the controller 11 serves as a processor of the governor 10 to implement the operation function of the governor 10, and the first actuator 12 and the second actuator 13 are directly electrically connected to the corresponding first diesel engine 100 and the second diesel engine 200, respectively, to implement the operation function of the governor 10. It can also be understood that, in this embodiment, one controller 11 and two actuators are provided for the "two-in-one" diesel generator 300 set, and the two actuators are respectively controlled by the one controller 11 to realize control over the two diesel engines, so that the advantage of the control is that when the speed measurement sensor of one diesel engine fails, the rotation speed of the one diesel engine can be controlled by the controller 11 according to the rotation speed of the other diesel engine, that is, the controller 11 is independently arranged for the two diesel engines to regulate and control, which is beneficial to avoiding the influence of the failure of the speed measurement sensor, and continuous, stable and synchronous control over the two diesel engines is realized.

Optionally, fig. 3 is a schematic structural diagram of another diesel generator set speed regulation system provided in an embodiment of the present invention, and referring to fig. 3, the first actuator 12 includes a first servo motor 14, and the second actuator 13 includes a second servo motor 15. The input end of the first servo motor 14 is electrically connected with the controller 11, the output end of the first servo motor 14 is electrically connected with the first diesel engine 100, and the first servo motor 14 adjusts the rotating speed of the first diesel engine 100 by adjusting the position of an accelerator rack of the first diesel engine 100 according to the corresponding distributed load signal; the input end of the second servo motor 15 is electrically connected with the controller 11, the output end of the second servo motor 15 is electrically connected with the second diesel engine 200, and the second servo motor 15 adjusts the rotating speed of the second diesel engine 200 by adjusting the position of the accelerator rack of the second diesel engine 200 according to the corresponding load distribution signal.

Specifically, the diesel engine comprises an accelerator, the opening and closing degree of the accelerator is determined by the position of an accelerator rack on the accelerator, and the larger the accelerator is opened, the higher the rotating speed of the diesel engine is, and the smaller the accelerator is opened, the lower the rotating speed of the diesel engine is. The servo motor adjusts the position of the throttle rack of the corresponding diesel engine according to the distributed load signal, the actuating mechanism adopts the servo motor, the size of the whole actuating mechanism can be effectively reduced, high torque output and high-precision control are realized, namely, the actuating mechanism is set to be of the servo motor type so as to improve the precision of balancing the load disturbance of the speed regulating system of the diesel generating set, and the running stability of the diesel generating set is further ensured.

Optionally, with continued reference to fig. 3, the first servo motor 14 includes a first servo driver 16 and a first servo actuator motor 17; the input end of the first servo driver 16 is used as the input end of the first servo motor 14, the output end of the first servo driver 16 is electrically connected with the input end of the first servo actuator 17, and the output end of the first servo actuator 17 is used as the output end of the first servo motor 14. The second servo motor 15 includes a second servo driver 18 and a second servo actuator motor 19; an input end of the second servo driver 18 serves as an input end of the second servo motor 15, an output end of the second servo driver 18 is electrically connected with an input end of the second servo actuator 19, and an output end of the second servo actuator 19 serves as an output end of the second servo motor 15. Specifically, each servo motor is provided with a servo driver and a servo actuator motor. The servo driver is connected to the controller 11 to receive the distributed load signal output by the controller 11. The servo actuator motor is simultaneously connected with the servo driver and the diesel engine, and the servo driver drives the servo actuator motor according to the distribution load signal to realize the regulation and control of the controller 11 on the diesel engine.

Optionally, fig. 4 is a schematic structural diagram of another diesel generator set governing system provided in an embodiment of the present invention, and referring to fig. 4, the controller 11 includes a rotation speed selection unit 111 and a load distribution unit 112. The rotating speed selection unit 111 is electrically connected with the first speed measurement sensor 20 and the second speed measurement sensor 21 respectively; the rotation speed selection unit 111 determines the actual rotation speed of the generator 300 according to the actual rotation speed of the first diesel engine 100 collected by the first tachometer sensor 20 and the actual rotation speed of the second diesel engine 200 collected by the second tachometer sensor 21, and determines the error rotation speed according to the actual rotation speed of the generator 300 and the preset rotation speed. The load distribution unit 112 is electrically connected to the rotation speed selection unit 111, and the load distribution unit 112 determines a distribution load signal according to the error rotation speed.

Specifically, the rotation speed selection unit 111 in the controller 11 receives the actual rotation speed of the first diesel engine 100 and the actual rotation speed of the second diesel engine 200 from the first tachometer sensor 20 and the second tachometer sensor 21, determines the actual rotation speed of the generator 300 according to the actual rotation speed of the first diesel engine 100 and the actual rotation speed of the second diesel engine 200, and further determines an error rotation speed according to the actual rotation speed of the generator 300 and a preset rotation speed, wherein the determination of the error rotation speed can be understood as the determination of the load disturbance magnitude. The distributed load unit rotation speed selection unit 111 in the controller 11 acquires an error rotation speed and determines a distributed load signal according to the error rotation speed.

Alternatively, how the rotational speed selection unit 111 determines the actual rotational speed of the generator 300 from the actual rotational speed of the first diesel engine 100 and the actual rotational speed of the second diesel engine 200 is explained below:

the first rotation speed selection unit 111 judges the received actual rotation speed of the first diesel engine 100 and the actual rotation speed of the second diesel engine 200, and a preset and modifiable normal rotation speed threshold, a first allowable threshold and a second allowable threshold are set in the rotation speed selection unit 111, where the first allowable threshold and the second allowable threshold may be equal or unequal:

if the actual rotation speed of the first diesel engine 100 is greater than the normal rotation speed threshold, the actual rotation speed of the second diesel engine 200 is selected as the actual rotation speed of the generator 300, that is, the rotation speed selection unit 111 determines an error rotation speed according to the preset rotation speed and the actual rotation speed of the second diesel engine 200, where the error rotation speed is a difference between the preset rotation speed and the actual rotation speed of the second diesel engine 200.

If the actual rotation speed of the second diesel engine 200 is greater than the normal rotation speed threshold, the actual rotation speed of the first diesel engine 100 is selected as the actual rotation speed of the generator 300, that is, the rotation speed selection unit 111 determines an error rotation speed according to the preset rotation speed and the actual rotation speed of the first diesel engine 100, where the error rotation speed is a difference between the preset rotation speed and the actual rotation speed of the first diesel engine 100.

If the actual rotation speed of the first diesel engine 100 and the actual rotation speed of the second diesel engine 200 are both greater than the normal rotation speed threshold, the rotation speed selection unit 111 does not determine the error rotation speed, in which case the rotation speed selection unit 111 does not determine the actual rotation speed of the generator 300 according to the actual rotation speed of the first diesel engine 100 and the actual rotation speed of the second diesel engine 200, and the rotation speed selection unit 111 may output an abnormal signal to the speed governor 10, so that the speed governor 10 outputs an emergency stop signal to the first actuator 12 and the second actuator 13 to control the first diesel engine 100 and the second diesel engine 200 to stop rotating, or control the first diesel engine 100 and the second diesel engine 200 to maintain the current rotation.

(ii) if the actual rotational speed of the first diesel engine 100 is greater than the actual rotational speed of the second diesel engine 200, selecting the actual rotational speed of the first diesel engine 100 as the actual rotational speed of the generator 300; that is, when the actual rotation speeds of the two diesel engines do not exceed the normal rotation speed threshold, if the actual rotation speed of the first diesel engine 100 is greater than the actual rotation speed of the second diesel engine 200, the actual rotation speed of the first diesel engine 100 is selected as the actual rotation speed of the generator 300, and the rotation speed selection unit 111 determines the error rotation speed according to the preset rotation speed and the actual rotation speed of the first diesel engine 100.

If the actual rotation speed of the second diesel engine 200 is greater than the actual rotation speed of the first diesel engine 100, that is, if the actual rotation speeds of the two diesel engines do not exceed the normal rotation speed threshold, if the actual rotation speed of the second diesel engine 200 is greater than the actual rotation speed of the first diesel engine 100, then:

(1) if the rotation speed selected at the previous moment is the actual rotation speed of the first diesel engine 100, if the difference value between the actual rotation speed of the second diesel engine 200 and the actual rotation speed of the first diesel engine 100 is greater than a first allowable threshold value, selecting the actual rotation speed of the second diesel engine 200 as the actual rotation speed of the generator 300, otherwise, selecting the actual rotation speed of the first diesel engine 100 as the actual rotation speed of the generator 300; that is, if the rotation speed selection unit 111 is calculating the error rotation speed at the preset rotation speed and the actual rotation speed of the first diesel engine 100 at the previous moment, but an increase in the actual rotation speed of the second diesel engine 200 occurs due to a load disturbance, if the actual rotation speed of the second diesel engine 200 increases to a difference from the actual rotation speed of the first diesel engine 100 greater than a first allowable threshold, the rotation speed selection unit 111 will select the actual rotation speed of the second diesel engine 200 to perform calculation of the error rotation speed from the preset rotation speed, and if the actual rotation speed of the second diesel engine 200 increases to a difference from the actual rotation speed of the first diesel engine 100 less than or equal to the first allowable threshold, the rotation speed selection unit 111 continues to calculate the error rotation speed at the preset rotation speed and the actual rotation speed of the first diesel engine 100. In the case of load disturbance, both the actual rotational speed of the first diesel engine 100 and the actual rotational speed of the second diesel engine 200 fluctuate, but the fluctuation magnitudes of both are not the same, and the greater actual rotational speed is selected as the rotational speed of the generator 300.

(2) If the rotation speed selected at the previous moment is the actual rotation speed of the second diesel engine 200, if the difference value between the actual rotation speed of the second diesel engine 200 and the actual rotation speed of the first diesel engine 100 is equal to or smaller than a second allowable threshold value, selecting the actual rotation speed of the first diesel engine 100 as the actual rotation speed of the generator 300, otherwise, selecting the actual rotation speed of the second diesel engine 200 as the actual rotation speed of the generator 300; that is, if the rotation speed selection unit 111 calculates the error rotation speed at the preset rotation speed and the actual rotation speed of the second diesel engine 200 at the previous moment, but there is a case where the actual rotation speed of the second diesel engine 200 decreases due to the governor 10 continuously adjusting the actual rotation speed of the second diesel engine 200 (for example PID adjustment), if the actual rotation speed of the second diesel engine 200 is reduced to a difference from the actual rotation speed of the first diesel engine 100 equal to or less than the second allowable threshold, the rotation speed selection unit 111 selects the actual rotation speed of the first diesel engine 100 from the preset rotation speed to perform the calculation of the error rotation speed, and if the actual rotational speed of the second diesel engine 200 decreases to a value that is still greater than the second allowable threshold from the actual rotational speed of the first diesel engine 100, the rotation speed selection unit 111 continues to calculate the error rotation speed at the preset rotation speed and the actual rotation speed of the second diesel engine 200.

In addition, the definition of "last time" and "current time" in this embodiment is as follows: in the operation of the rotational speed selection unit 111 to make one rotational speed selection, the time before the rotational speed selection unit 111 makes the rotational speed selection operation is "previous time", and the time after the rotational speed selection unit 111 makes the rotational speed selection operation is "current time".

In the method for determining the actual rotation speed and the error rotation speed of the generator 300 provided by this embodiment, the actual rotation speed of the first diesel engine 100 and the actual rotation speed of the second diesel engine 200 are taken into consideration, so that the actual rotation speed of the generator 300 is uniformly and stably obtained, thereby contributing to realizing uniform balance of load disturbance caused by the two diesel engines and consistency of control effects of the two diesel engines.

Optionally, fig. 5 is a schematic structural diagram of another diesel genset governor system provided in an embodiment of the present invention, and referring to fig. 5, the diesel genset governor system provided in the embodiment of the present invention further includes a first rack position sensor 30 and a second rack position sensor 31. The first rack position sensor 30 is connected to the first diesel engine 100, and the second rack position sensor 31 is connected to the second diesel engine 200. The speed governor 10 is electrically connected with a first rack position sensor 30 and a second rack position sensor 31, respectively; the governor 10 adjusts the rotation speed of the first diesel engine 100 to the target rotation speed and the rotation speed of the second diesel engine 200 to the target rotation speed, respectively, based on the actual load signal of the first diesel engine 100 collected by the first rack position sensor 30, the actual load signal of the second diesel engine 200 collected by the second rack position sensor 31, and the distributed load signal.

Specifically, a diesel engine load signal, a diesel engine throttle rack position signal and the rotation speed of the diesel engine correspond to one another. Thus, the actual throttle rack position signal of the diesel engine corresponds to the actual load signal of the diesel engine. After the speed regulator 10 outputs the distributed load signal to the diesel engine, the throttle rack position signal of the diesel engine is determined to be a target throttle rack position signal of the diesel engine, and the target throttle rack position signal corresponds to the target rotating speed of the diesel engine and also corresponds to the target load signal of the diesel engine.

After the governor 10 outputs the distributed load signals to the first diesel engine 100 and the second diesel engine 200, respectively, it is necessary to determine whether to adjust the rotational speed of the first diesel engine 100 and the rotational speed of the second diesel engine 200 to the target rotational speeds, i.e., whether to adjust the throttle rack position signal of the first diesel engine 100 and the throttle rack position signal of the second diesel engine 200 to the target throttle rack position signal, respectively. In this embodiment, the first rack position sensor 30 and the second rack position sensor 31 are provided to respectively acquire throttle rack position signals of the first diesel engine 100 and the second diesel engine 200 in real time.

The throttle rack position signals of the first diesel engine 100 and the second diesel engine 200 correspond to actual load signals of the first diesel engine 100 and the second diesel engine 200, respectively, and the governor 10 may calculate a target load signal of the first diesel engine 100 according to the actual load signal and the distributed load signal of the first diesel engine 100, the target load signal corresponding to a target rotation speed.

After the speed governor 10 outputs the distribution load signal to the first diesel engine 100, the speed governor 10 compares the actual load signal of the first diesel engine 100 fed back by the first rack position sensor 30 in real time with the calculated target load signal, calculates a difference between the actual load signal and the target load signal, i.e., an error load signal, if the actual load signal has not yet reached the target load signal, and outputs the error load signal to the first diesel engine 100 until the rotational speed of the first diesel engine 100 is adjusted to the target rotational speed, so that the rotational speed of the diesel engine is adjusted by outputting the distribution load signal to the first diesel engine 100 to balance the disturbance of the load, thereby also realizing the feedback adjustment, i.e., PID adjustment, of the first diesel engine 100. The principle of the governor 10 adjusting the rotation speed of the second diesel engine 200 to the target rotation speed is the same as the principle of adjusting the rotation speed of the first diesel engine 100 to the target rotation speed, and a method of adjusting the rotation speed of the first diesel engine 100 to the target rotation speed may be directly referred to, and details thereof are not repeated.

Optionally, the diesel generator set speed regulation system provided by the embodiment further comprises a first converter and a second converter. The governor 10 is electrically connected to the first rack position sensor 30 through a first converter, and the first converter is configured to convert an actual rack position signal of the first diesel engine 100 collected by the first rack position sensor 30 into an actual load signal of the first diesel engine 100, where the actual load signal of the first diesel engine 100 is a current signal. The speed governor 10 is electrically connected to the second rack position sensor 31 through a second converter, the second converter is configured to convert an actual rack position signal of the second diesel engine 200 collected by the second rack position sensor 31 into an actual load signal of the second diesel engine 200, and the actual load signal of the second diesel engine 200 is a current signal.

Specifically, the conversion of the rack position signal to a load signal may be accomplished by a distributed load cell in the governor 10. The load signal of the diesel engine can be a current signal output by the speed regulator 10 to the servo driver, the current of the current signal can be between 4 milliamperes and 20 milliamperes, the larger the current output by the speed regulator 10 to the servo driver is, the larger the rotation angle of the servo execution motor is, the larger the throttle degree of the diesel engine is, the larger the opening degree of the throttle of the diesel engine can be detected by the rack position sensor, and different rack position signals can reflect different opening degrees of the throttle of the diesel engine.

Optionally, the speed control system of the diesel generator set provided by this embodiment further includes: a first inverter and a second inverter. The speed regulator 10 is electrically connected with the first speed measurement sensor 20 through a first converter, and the first converter is used for converting the actual rotating speed of the first diesel engine 100 collected by the first speed measurement sensor 20 into a corresponding current signal; the speed controller 10 is electrically connected to the second speed sensor 21 through a second converter, and the second converter is configured to convert the actual rotational speed of the second diesel engine 200 collected by the second speed sensor 21 into a corresponding current signal.

Specifically, the speed regulator 10 receives a rotation speed signal of the diesel engine as a current signal, and the magnitude of the current signal may be between 4 ma and 20 ma. Therefore, the corresponding distribution load signal is also a current signal, and the governor 10 outputs the distribution load signal to the diesel engine, which can be understood as that the controller 11 outputs a current signal to the actuator, for example, outputs a current signal to the servo driver, so as to adjust the opening degree of the throttle valve of the diesel engine, that is, to adjust the rotation speed of the diesel engine. The distributed load signals respectively output to the first diesel engine 100 and the second diesel engine 200 may be equal or unequal, if the various configurations of the first diesel engine 100 and the second diesel engine 200 are completely consistent, the load disturbance is preferably equally distributed to the first diesel engine 100 and the second diesel engine 200, that is, the distributed load signals output to the first diesel engine 100 and the second diesel engine 200 are equal, and if the various configurations of the first diesel engine 100 and the second diesel engine 200 are not completely consistent, the distributed load unit may correspondingly distribute the first diesel engine 100 and the second diesel engine 200 according to the various configurations of the first diesel engine 100 and the second diesel engine 200 when performing load distribution, that is, the distributed load signals output to the first diesel engine 100 and the second diesel engine 200 are unequal.

Optionally, the diesel generator set speed regulation system provided by this embodiment further includes a first circuit breaker and a second circuit breaker. The first circuit breaker is electrically connected with the first diesel engine 100, the first circuit breaker is electrically connected with the speed regulator 10, and the speed regulator 10 judges that the first diesel engine 100 is in an island mode or a speed reduction mode according to a signal of the first circuit breaker; the second circuit breaker is electrically connected to the second diesel engine 200, the second circuit breaker is electrically connected to the governor 10, and the governor 10 determines that the second diesel engine 200 is in an island mode or a speed drop mode according to a signal of the second circuit breaker. Specifically, the governor 10 can determine that the first diesel engine 100 is in the islanding mode or the speed drop module according to the received signal of the first circuit breaker, and similarly, the governor 10 can determine that the second diesel engine 200 is in the islanding mode or the speed drop module according to the received signal of the second circuit breaker.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.