阅读说明：本技术 一种可变频调压的输出发电装置 (Variable frequency voltage-regulating output power generation device ) 是由 刘慧� 喻小涛 毛一平 于 2020-07-27 设计创作，主要内容包括：本申请提供的一种可变频调压的输出发电装置,涉及供配电技术领域。包括：变频器、电动机、发电机以及控制设备；电动机分别与变频器、发电机连接；控制设备分别与变频器、发电机、电动机连接；变频器,用于连接输入电源,并接收控制设备的变频指令,根据变频指令调整输出电压；电动机,用于根据输出电压运动,向发电机供电。通过控制设备接收控制指令,并使变频器分别与控制设备以及电动机连接使变频器对电动机的输出频率进行调节,由电动机为发电机供电,并通过控制设备对发电机的输出电压进行调节,实现了发电机不同频率的宽范围电压输出,提高了对发电机输出电压的控制精度。(The application provides a variable frequency voltage-regulating output power generation device, and relates to the technical field of power supply and distribution. The method comprises the following steps: the system comprises a frequency converter, a motor, a generator and control equipment; the motor is respectively connected with the frequency converter and the generator; the control equipment is respectively connected with the frequency converter, the generator and the motor; the frequency converter is used for connecting an input power supply, receiving a frequency conversion instruction of the control equipment and adjusting output voltage according to the frequency conversion instruction; and the motor is used for supplying power to the generator according to the movement of the output voltage. The control device receives the control instruction, the frequency converter is connected with the control device and the motor respectively to adjust the output frequency of the motor, the motor supplies power to the generator, the control device adjusts the output voltage of the generator, wide-range voltage output of different frequencies of the generator is achieved, and control precision of the output voltage of the generator is improved.)

1. A variable frequency voltage regulated output power generation apparatus, said apparatus comprising: the system comprises a frequency converter, a motor, a generator and control equipment;

the motor is respectively connected with the frequency converter and the generator; the control equipment is respectively connected with the frequency converter, the generator and the motor;

the frequency converter is used for connecting an input power supply, receiving a frequency conversion instruction of the control equipment and adjusting output voltage according to the frequency conversion instruction;

the motor is used for supplying power to the generator according to the movement of the output voltage.

2. The power generation apparatus according to claim 1, wherein the control device is configured to sample an output voltage of the generator and send a voltage control command to the generator according to the output voltage;

and the generator is used for receiving the voltage control instruction sent by the control equipment, adjusting output voltage according to the voltage control instruction and outputting the adjusted voltage to a connected load.

3. The power generation apparatus according to claim 2, wherein the control device is configured to send a voltage control command to the generator when the sampled output voltage does not meet a preset threshold.

4. The power generation apparatus according to claim 1, wherein the control device is configured to sample a rotation speed of the motor and send a rotation speed adjustment instruction to the motor;

and the motor is used for receiving the rotating speed adjusting instruction and adjusting the rotating speed according to the rotating speed adjusting instruction.

5. The power generation apparatus of claim 1, further comprising: an instrument box; the instrument box is respectively connected with the control equipment, the generator and the motor;

the instrument box is used for receiving the rotating speed signal of the motor, the voltage signal and the current signal of the generator and displaying the rotating speed signal, the voltage signal and the current signal.

6. The power generation apparatus of claim 1, further comprising: a star-delta switch cabinet;

the star-delta switch cabinet comprises: the output ends of the first switch and the second switch are used for being connected with a load; the input ends of the first switch and the second switch are used for connecting the generator; the third switch is connected with the input ends of the generator and the second switch; when the first switch is closed, the second switch is opened and the third switch is closed, outputting a star connection; when the first switch is closed, the second switch is closed and the third switch is opened, the output is triangular wiring.

7. The power generation apparatus according to claim 6, wherein the control device is configured to obtain a rotation speed signal of the motor, a voltage signal of the generator, and a current signal received by an instrument box; and when the current signal exceeds a preset current threshold value, controlling the first switch in the star-delta switching cabinet to be switched off.

8. The power generation apparatus of claim 6, wherein the control device is further configured to control the third switch to close when the second switch is open; and controlling the third switch to be switched off when the second switch is switched off.

9. The power generation apparatus of any one of claims 1-8, wherein the input power source is a high voltage utility power, the motor is a high voltage motor, and the generator is a high voltage generator.

10. The power generation apparatus of any of claims 1-8, wherein the generator is a digital generator.

Technical Field

The application relates to the technical field of power supply and distribution, in particular to a variable-frequency voltage-regulating output power generation device.

Background

The generator is also called as a standby power supply or an emergency power supply, and is mainly applied to certain power utilization units, although the grid power supply is relatively reliable and reliable, in order to prevent accidents, such as circuit faults or temporary power failure, the generator needs to be configured with a self-contained power supply for emergency power generation. Due to the convenience of the generator, the existing generator is widely applied to various fields of national economy such as electric power, communication, industrial and mining and the like.

In order to improve the economy and the utilization rate of electric energy and supply electric power on some special occasions, a generator set combining a motor and a generator is adopted, and the generator set mainly provides a test power supply for pump industry tests, research on pump motors of scientific research units in colleges and universities and the like.

In the current generator set combining the motor and the generator, the voltage regulation of the motor generally adopts an analog quantity signal, and the analog quantity signal is influenced by the output impedance of a sending circuit, the resistance value of a cable, electromagnetic interference and the like, so that the voltage regulation signal reaching the generator is inconsistent with the signal at the output end of a controller of the motor, and the error between the output voltage of the generator and the expected voltage is larger.

Disclosure of Invention

In order to solve the problems existing in the prior art, the application provides an output power generation device capable of realizing frequency conversion and voltage regulation.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

the present application provides a variable frequency voltage-modulated output power generation apparatus, the apparatus including: the system comprises a frequency converter, a motor, a generator and control equipment;

the motor is respectively connected with the frequency converter and the generator; the control equipment is respectively connected with the frequency converter, the generator and the motor;

the frequency converter is used for connecting an input power supply, receiving a frequency conversion instruction of the control equipment and adjusting output voltage according to the frequency conversion instruction;

the motor is used for supplying power to the generator according to the movement of the output voltage.

Optionally, the control device is configured to sample an output voltage of the generator, and send a voltage control instruction to the generator according to the output voltage;

and the generator is used for receiving the voltage control instruction sent by the control equipment, adjusting output voltage according to the voltage control instruction and outputting the adjusted voltage to a connected load.

Optionally, the control device is specifically configured to send a voltage control instruction to the generator when the sampled output voltage does not satisfy a preset threshold.

Optionally, the control device is configured to sample a rotation speed of the motor and send a rotation speed adjustment instruction to the motor;

and the motor is used for receiving the rotating speed adjusting instruction and adjusting the rotating speed according to the rotating speed adjusting instruction.

Optionally, the apparatus further comprises: an instrument box; the instrument box is respectively connected with the control equipment, the generator and the motor;

the instrument box is used for receiving the rotating speed signal of the motor, the voltage signal and the current signal of the generator and displaying the rotating speed signal, the voltage signal and the current signal.

Optionally, the apparatus further comprises: a star-delta switch cabinet;

the star-delta switch cabinet comprises: the output ends of the first switch and the second switch are used for being connected with a load; the input ends of the first switch and the second switch are used for connecting the generator; the third switch is connected with the input ends of the generator and the second switch; when the first switch is closed, the second switch is opened and the third switch is closed, outputting a star connection; when the first switch is closed, the second switch is closed and the third switch is opened, the output is triangular wiring.

Optionally, the control device is configured to obtain a rotation speed signal of the motor, a voltage signal of the generator, and a current signal received by the instrument box; and when the current signal exceeds a preset current threshold value, controlling the first switch in the star-delta switching cabinet to be switched off.

Optionally, the control device is further configured to control the third switch to be closed when the second switch is opened; and controlling the third switch to be switched off when the second switch is switched off.

Optionally, the input power source is a high-voltage commercial power, the motor is a high-voltage motor, and the generator is a high-voltage generator.

Optionally, the generator is a digital generator.

The application provides a variable frequency voltage-regulating output power generation device, including: the system comprises a frequency converter, a motor, a generator and control equipment; the motor is respectively connected with the frequency converter and the generator; the control equipment is respectively connected with the frequency converter, the generator and the motor; the frequency converter is used for connecting an input power supply, receiving a frequency conversion instruction of the control equipment and adjusting output voltage according to the frequency conversion instruction; and the motor is used for supplying power to the generator according to the movement of the output voltage. The control device receives the control instruction, the frequency converter is connected with the control device and the motor respectively to adjust the output frequency of the motor, the motor supplies power to the generator, the control device adjusts the output voltage of the generator, wide-range voltage output of different frequencies of the generator is achieved, and the control precision of the output voltage of the generator is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a variable-frequency voltage-regulating output power generation device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a variable-frequency voltage-regulating output power generation device according to another embodiment of the present application;

fig. 3 is a schematic structural diagram of a variable-frequency voltage-regulating output power generation device according to another embodiment of the present application;

fig. 4 is a schematic view of star-delta switching according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.

In the current generator set combining the motor and the generator, the voltage regulation of the motor generally adopts an analog quantity signal, and the analog quantity signal is influenced by the output impedance of a sending circuit, the resistance value of a cable, electromagnetic interference and the like, so that the voltage regulation signal reaching the generator is inconsistent with the signal at the output end of a controller of the motor, and the error between the output voltage of the generator and the expected voltage is larger.

In order to solve the above problems, an embodiment of the present invention provides a variable frequency voltage-regulating output power generation apparatus, and fig. 1 is a schematic structural diagram of a variable frequency voltage-regulating output power generation apparatus according to an embodiment of the present invention. As shown in fig. 1, the apparatus includes: a frequency converter 1, a motor 2, a generator 3 and a control device 6; the motor 2 is respectively connected with the frequency converter 1 and the generator 3; the control equipment 6 is respectively connected with the frequency converter 1, the generator 3 and the motor 2; the frequency converter 1 is used for connecting an input power supply, receiving a frequency conversion instruction of the control equipment 6 and adjusting output voltage according to the frequency conversion instruction; and the motor 2 is used for supplying power to the generator 3 according to the output voltage movement.

The frequency converter 1 is used for changing the frequency and amplitude of power supply of the alternating current motor, so that the period of a moving magnetic field of the alternating current motor is changed, and the rotating speed of the motor is smoothly controlled. In the embodiment of the present application, the inverter 1 has one end connected to an input power source and the other end connected to the motor 2 and the control device 6. Specifically, the input power source in the embodiment of the present application is three-phase alternating current, which corresponds to U, V, W in fig. 1. The embodiment of the present application is not limited to setting the specific voltage of the input power.

Exemplarily, in the present embodiment, the control device 6 implements the control (frequency conversion instruction) process of the voltage of the motor 2 through the frequency converter 1 as follows: taking the example that the voltage frequency required to be output is 480V and 60HZ, the control device 6 sends control signals (480V and 60HZ) to the frequency converter 1, the voltage to be input by the frequency converter 1 can be 220V and 50HZ, firstly, the input voltage 220 is maintained unchanged, and the voltage frequency is adjusted to 60 HZ; the adjusted voltage (220V, 60HZ) is then input to the generator 3 by the motor 2, and finally the control device 6 controls the output voltage of the generator 3 to be adjusted, i.e. the input voltage is adjusted from 220V to 480V, and finally the required target voltage (480V, 60HZ) is reached.

It can be understood that, in the embodiment of the present application, through adjusting the output voltage (output voltage range, output voltage frequency) of the generator 3, when the generator 3 is used for supplying power to some loads or devices, the power supply range of the generator 3 can be expanded without being limited by the voltage magnitude and the voltage frequency of the loads or devices.

The control device 6 may remotely control the motor 2 and the generator 3 by remote signals through remote wiring. Therefore, the control device 6 in the embodiment of the present application is also referred to as a remote control system.

The output power generation facility of variable frequency voltage regulation that this application embodiment provided includes: the system comprises a frequency converter, a motor, a generator and control equipment; the motor is respectively connected with the frequency converter and the generator; the control equipment is respectively connected with the frequency converter, the generator and the motor; the frequency converter is used for connecting an input power supply, receiving a frequency conversion instruction of the control equipment and adjusting output voltage according to the frequency conversion instruction; and the motor is used for supplying power to the generator according to the movement of the output voltage. The control device receives the control instruction, the frequency converter is connected with the control device and the motor respectively to adjust the output frequency of the motor, the motor supplies power to the generator, the control device adjusts the output voltage of the generator, wide-range voltage output of different frequencies of the generator is achieved, and the control precision of the output voltage of the generator is improved.

Optionally, the control device 6 is configured to sample an output voltage of the generator 3 and send a voltage control command to the generator 3 according to the output voltage;

and the generator 3 is used for receiving the voltage control instruction sent by the control equipment 6, adjusting the output voltage according to the voltage control instruction, and outputting the adjusted voltage to a connected load.

In the embodiment of the present application, A Voltage Regulator (AVR) for applying a control command (mainly, a Voltage regulating command) to the generator 3 is provided inside the generator 3. AVRs are commonly used in field generators, primarily to regulate the generator output voltage and control the internal field voltage, and are essentially feedback circuits. In the embodiment of the present application, the adjustment of the target voltage is realized by the interaction of the control device 6 and the AVR.

Illustratively, when the target output voltage of the generator 3 is 480V, the control device 6 sends a voltage adjustment command to an AVR inside the generator 3, which controls the voltage output by the generator 3 by controlling the field current inside the generator 3. It should be noted that, in the embodiment of the present application, there is a corresponding regulation relationship between the excitation current and the output voltage of the generator 3. That is, when the AVR control excitation current changes, the output voltage also changes accordingly.

It should be noted that the communication between the control device 6 and the AVR inside the generator 3 may be implemented by MODBUS TCP communication. MODBUSTCP combines an Ethernet physical network, a network standard TCP/IP and a data representation method taking MODBUS as an application protocol standard, and MODBUS TCP communication messages are encapsulated in Ethernet TCP/IP data packets.

When the control device 6 controls the voltage of the generator 3, the voltage regulation result of the generator may have a certain error due to interference of some external factors. In order to reduce the influence of the error, in the embodiment of the present application, the control device 6 is further configured to sample the output voltage of the generator 3, and when the error between the output voltage of the generator 3 and the target voltage is large, the output voltage of the generator 3 is finely adjusted according to the sampling result.

In the embodiment of the application, the output voltage of the generator 3 is sampled by the control device 6, and the output voltage of the generator 3 is adjusted by the sampling signal, so that the control device 6 controls the generator 3 in a closed-loop control mode, and the technical problem that the voltage output error of the generator 3 is large when the control device 6 is simply used for interacting with the AVR is solved.

Optionally, the control device 6 is specifically configured to send a voltage control instruction to the generator 3 when the sampled output voltage does not satisfy the preset threshold.

In the embodiment of the present application, the magnitude of the output voltage may be completely consistent with the magnitude of the target voltage, or a certain error may exist. The output voltage is considered to meet the target voltage as long as the error between the output voltage and the target voltage is acceptable within a certain preset threshold range.

Specifically, in the embodiment of the present application, the output voltage of the generator 3 is sampled by the control device 6 and compared with a preset target voltage, and when the difference between the output voltage and the target voltage satisfies a preset threshold, the output of the voltage of the generator 3 is controlled. When the difference between the output voltage and the target voltage does not meet the preset threshold, the control device 6 sends a voltage control instruction to the generator 3, and continues to adjust the output voltage of the generator 3 through interaction with the AVR in the generator.

In the embodiment of the present application, the setting of the preset threshold may be adjusted according to actual requirements, and for example, the preset threshold may be set within a range of 0.1V of the target voltage. Specifically, for setting the preset threshold, the embodiment of the present application is not limited.

Optionally, a control device 6, configured to sample a rotation speed of the motor 2 and send a rotation speed adjustment instruction to the motor 2; and the motor 2 is used for receiving the rotating speed adjusting instruction and adjusting the rotating speed according to the rotating speed adjusting instruction.

When the control device 6 controls the voltage frequency output by the motor 2 through the frequency converter 1, there may be interference of some external factors, and therefore, there may be a certain error in the output voltage frequency of the motor 2, and in order to reduce the influence of the error, in this embodiment of the application, the control device 6 is further configured to sample a rotation speed signal of the motor 2. Note that there is a certain correspondence relationship between the rotation speed signal of the motor 2 and the frequency of the output voltage of the motor 2. That is, when the rotation speed of the motor 2 is represented by n and the output voltage frequency is represented by f: n is 60 f/p. Where p is the pole pair number of the rotating magnetic field of the motor 2.

In the embodiment of the application, the control device 6 is used for sampling the rotating speed of the motor 2, and the sampled rotating speed signal of the motor 2 is converted into the corresponding output voltage frequency through a conversion formula between the rotating speed of the motor and the output voltage frequency. When the corresponding output voltage frequency converted by the rotation speed of the motor 2 is the same as the preset frequency, the preset condition is satisfied. When the corresponding output voltage frequency converted by the rotating speed of the motor 2 is different from the preset frequency, the rotating speed adjusting instruction is sent to the motor 2 through the frequency converter 1 according to the rotating speed of the motor 2 sampled by the control device 6, and the rotating speed of the motor 2 is adjusted by the motor 2 according to the rotating speed adjusting instruction until the rotating speed signal of the motor 2 sampled by the control device 6 is converted into the corresponding output voltage frequency and reaches the preset requirement.

Fig. 2 is a schematic structural diagram of an output power generation apparatus capable of frequency conversion and voltage regulation according to another embodiment of the present application. As shown in fig. 2, the apparatus further includes: an instrument box 5; the instrument box 5 is respectively connected with the control device 6, the generator 3 and the motor 2;

the meter box 5 is configured to receive a rotation speed signal of the motor 2, a voltage signal and a current signal of the generator 3, and display the rotation speed signal, the voltage signal and the current signal.

In the embodiment of the application, the meter box 5 can display the rotating speed signal of the motor 2, the voltage signal of the generator 3 and the current signal in real time, and a worker can visually see some important information related to voltage regulation through the meter box 5.

In order to meet different wiring modes of different loads, fixed wiring modes are avoided, such as: the star connection or the triangular connection results in that the generator 3 cannot supply power for certain loads, and the output of different connection modes is realized by controlling the connection method of the generator in the embodiment of the application.

Fig. 3 is a schematic structural diagram of an output power generation apparatus capable of frequency conversion and voltage regulation according to another embodiment of the present application. As shown in fig. 3, the apparatus further comprises: a star-delta switching cabinet 4; the star-delta switching cabinet 4 includes: the output ends of the first switch QF1 and the second switch QF2 are used for connecting a load; the input ends of the first switch QF1 and the second switch QF2 are used for connecting the generator 3; the third switch QF3 is connected to the input of the generator 3 and the second switch QF 2; when the first switch QF1 is closed, the second switch QF2 is open, and the third switch QF3 is closed, the output is star connection; when the first switch QF1 is closed, the second switch QF2 is closed, and the third switch QF3 is open, the output is triangular wiring, and a star-triangle switching schematic diagram is shown in fig. 4.

In the present example, the third switch QF3 and the second switch QF2 have an appliance interlock function, and in particular, the third switch and the second switch may be circuit breakers. The electrical interlocking between QF3 and QF2 can ensure that when one breaker is switched on in the operation process of the whole device, the other breaker can be safely and reliably ensured not to be switched on.

It should be noted that, in the embodiment of the present application, the first switch may also be configured as a circuit breaker, and specifically, may also be configured as a three-stage circuit breaker.

In order to avoid the circuit damage or the equipment burnout caused by the circuit abnormality, the current signal of the generator 3 is monitored by acquiring the data in the instrument box 5 in the embodiment of the application.

Optionally, the control device 6 is configured to obtain a rotation speed signal of the motor 2, a voltage signal of the generator 3 and a current signal received by the meter box 5; when the current signal exceeds a preset current threshold value, the first switch QF1 in the star-delta switch cabinet 4 is controlled to be switched off.

It should be noted that in the embodiment of the present application, the communication between the control device 6 and the meter box 5 may utilize the RS485 interface on the meter box 5 to transmit the operating parameters of the motor 2 and the generator 3 to the control device 6. When the control device 6 monitors that the current of the generator 3 exceeds a preset threshold, and the time exceeding the preset threshold is maintained for a certain set time, the control device 6 controls the first switch QF1 in the star-delta switching cabinet 4 to be turned off.

It can be understood that, in the present embodiment, the control loop of the power generation device and the operation safety of the load device can be protected to some extent by monitoring the output current of the generator and switching off the first switch QF1 when the output current exceeds a preset threshold.

Optionally, the control device 6 is further configured to control the third switch QF3 to be closed when the second switch QF2 is open; when the second switch QF2 is closed, the third switch QF3 is controlled to be opened.

In some possible implementations, the states of the second switch and the third switch may also be controlled by the control device 6. Specifically, when the control device 6 detects that the second switch QF2 is open, the third switch QF3 is controlled to be closed, and when the control device 6 detects that the second switch QF2 is closed, the third switch QF3 is controlled to be open.

Optionally, the input power source is a high-voltage commercial power, the motor 2 is a high-voltage motor, and the generator 3 is a high-voltage generator.

It should be noted that, in the embodiment of the present application, the input voltage of the frequency converter 1 is the high-voltage commercial power, and may be, for example, 10.5KV high-voltage commercial power. The motor 2 and the generator 3 are a high-voltage motor and a high-voltage generator, respectively.

Optionally, the generator 3 is a digital generator.

In the embodiment of the present application, the generator 3 may specifically be a digital generator. Specifically, in the embodiment of the present application, the digital AVR inside the digital generator may be controlled to perform the generator excitation, voltage regulation, and output voltage control.

It can be understood that, in the embodiment of the present application, the digital generator is adopted to avoid the influence of the output impedance, the cable resistance value, the electromagnetic interference, and the like of the sending circuit on the analog quantity signal when the analog quantity signal is adopted in the prior art. The method has the advantages of strong real-time performance, long transmission distance, strong anti-electromagnetic interference capability and the like.

The output power generation facility of variable frequency pressure regulating that this application embodiment provided receives control command through controlgear to make the converter be connected with controlgear and motor respectively and make the converter adjust the output frequency of motor, supply power for the generator by the motor, and adjust the output voltage of generator through controlgear, realized the wide range voltage output of different frequencies, improved the control accuracy of generator output voltage.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.