Pressure maintaining system and intelligent control method
阅读说明：本技术 一种压力维持系统及智能控制方法 (Pressure maintaining system and intelligent control method ) 是由 涂勇 于 2020-12-30 设计创作，主要内容包括：一种压力维持系统及智能控制方法,该系统包括压力容器,无压容器、压力维持设备；压力容器通过压力维持设备连接无压容器。压力容器设有第一传感器,无压容器设有第二传感器。第一、二传感器和压力维持设备均连接控制器,控制器连接人机交互装置。本发明旨在解决稳态固定消耗负载与压力维持设备输出功率不匹配,即系统压力由于稳态固定消耗下降的速度与压力维持设备加压的能力大小不匹配导致的,压力维持设备频繁启停或加卸载,设备原件磨损消耗加剧,影响压力维持设备寿命,同时导致能量损失,影响系统能效和经济性等问题。(A pressure maintenance system and intelligent control method, the system includes pressure vessel, non-pressure vessel, pressure maintenance equipment; the pressure vessel is connected to the pressureless vessel by a pressure maintenance device. The pressure container is provided with a first sensor, and the pressureless container is provided with a second sensor. The first sensor, the second sensor and the pressure maintaining equipment are connected with a controller, and the controller is connected with the human-computer interaction device. The invention aims to solve the problems that the output power of a steady-state fixed consumption load is not matched with the output power of a pressure maintaining device, namely the system pressure is not matched with the pressurizing capacity of the pressure maintaining device due to the fact that the steady-state fixed consumption descending speed is not matched with the pressurizing capacity of the pressure maintaining device, the pressure maintaining device is frequently started and stopped or loaded and unloaded, the abrasion consumption of the original parts of the device is aggravated, the service life of the pressure maintaining device is influenced, energy loss is caused, and the energy efficiency and.)
1. A pressure maintenance system, characterized in that the system comprises: a pressure vessel (1), a non-pressure vessel (2) and a pressure maintaining device (4); the pressure container (1) is connected with the pressureless container (2) through a pressure maintaining device (4); the pressure container (1) is provided with a first sensor, and the pressureless container (2) is provided with a second sensor; the first sensor, the second sensor and the pressure maintaining equipment (4) are connected with a controller (6), and the controller (6) is connected with a human-computer interaction device (7).
2. A pressure maintenance system as claimed in claim 1, wherein: the pressure container (1) is a pressure oil tank or a pressure gas tank.
3. A pressure maintenance system as claimed in claim 1, wherein: the non-pressure container (2) is a non-pressure oil tank or an air bag.
4. A pressure maintenance system as claimed in claim 1, wherein: the pressure maintaining equipment (4) is n fixed-frequency oil pumps or air compressors with different models and specifications, and the n fixed-frequency oil pumps or air compressors are respectively 1# and 2# … … n # according to the sequence from small to large of the pressurizing capacity.
5. A pressure maintenance system as claimed in claim 1, wherein: the controller (6) receives the corresponding pressurizing capacity information p1, p2, …, pn, p1< p2< … < pn of n fixed frequency oil pumps or air compressors in the pressure maintaining equipment (4) arranged by the man-machine interaction device (7); and according to the acquired state signal of the pressure maintenance system, after logical processing is carried out by adopting an intelligent control method of the pressure maintenance system, n fixed-frequency oil pumps or air compressors with different type numbers and specifications in the pressure maintenance equipment (4) are controlled, and meanwhile, the state information of the pressure maintenance system is transmitted to a man-machine interaction device (7).
6. A pressure maintenance system as claimed in claim 1, wherein: the man-machine interaction device (7) is communicated with the controller (6), the information of the pressurizing capacity of n fixed-frequency oil pumps or air compressors in the pressure maintaining equipment (4) arranged by a user through the man-machine interaction device (7) is transmitted to the controller (6), and meanwhile, the man-machine interaction device (7) acquires the parameter information of the pressure maintaining system sent by the controller (6) to carry out graphical display.
7. An intelligent control method of a pressure maintenance system is characterized by comprising the following steps:
step 1, initializing a controller (6), and acquiring rated pressure P set by a user through a man-machine interaction device (7)Forehead (forehead)Starting up of the standby-equipment pressure PPrepare forThe pressurizing capacity information p1, p2, …, pn corresponding to n fixed frequency oil pumps or air compressors in the pressure maintaining equipment (4); p1 is not less than p2 is not less than … is not less than pn;
step 2, the controller (6) controls n oil pumps or air compressors to operate and load, and the pressure maintenance system is pressurized to the rated pressure PForehead (forehead)Then stopping the operation of the n oil pumps or the air compressors;
step 3, the controller (6) collects pressure to maintain the system pressure P1, and starts timing;
step 4, the controller (6) detects whether the timing is over t minutes, if yes, the step 5 is carried out, and if not, the detection is continued;
step 5, the controller (6) collects pressure to maintain the system pressure P2;
step 6, the controller (6) calculates the steady-state fixed consumption load P of the pressure maintenance system to be (P1-P2)/t;
step 7, if pi is less than or equal to p < pj, starting an i # oil pump or an air compressor as main pressurizing equipment to operate and load for a long time, and entering the step 10; pi and pj are the information of the pressurizing capacity of two devices i # and j # with adjacent serial numbers in n fixed-frequency oil pumps or air compressors in the pressure maintaining device (4); otherwise, entering step 8;
step 8, if p is less than p1, starting a 1# oil pump or air compressor as a main pressurizing device to operate and load for a long time, and entering step 10; otherwise, go to step 9;
step 9, starting an n # oil pump or an air compressor as main pressurizing equipment to operate and load for a long time, and entering step 10;
step 10, entering a conventional control mode; that is, the controller (6) detects that the pressure of the pressure maintenance system is reduced to the pressure P of the standby equipmentPrepare forWhen the pressure of the system is detected to be increased to the rated pressure P, the rest standby pressurizing equipment is started in turnForehead (forehead)When so, all the spare pressurizing apparatuses are stopped.
Technical Field
The invention belongs to the field of industrial control, and particularly relates to a pressure maintaining system and an intelligent control method.
Background
In industrial control, there are many applications that require a pressure maintenance system, such as a hydro-generator set governor that regulates vane opening, set power and frequency, requiring a governor hydraulic system; the middle-low pressure gas system is needed in occasions such as a large shaft gas supplementing system of the hydroelectric generating set, a bus micro-positive pressure system, a speed regulator pressure oil tank gas supplementing system, an air brake mechanical braking system and the like. Governor hydraulic systems and medium and low pressure air systems are typical pressure maintenance systems.
The pressure maintenance system is usually designed with a plurality of fixed-frequency oil pumps or air compressors with the same model and specification as pressure maintenance equipment, but because the load of the pressure maintenance system has a steady-state fixed consumption load and a random consumption load, if the output power of the steady-state fixed consumption load is not matched with the output power of the pressure maintenance equipment, namely the speed of the system pressure reduced due to the steady-state fixed consumption is not matched with the pressure capacity of the pressure maintenance equipment, the pressure maintenance equipment is frequently started, stopped or unloaded, the abrasion consumption of the original equipment is aggravated, the service life of the pressure maintenance equipment is influenced, the energy loss is caused, and the energy efficiency and the economical efficiency.
Disclosure of Invention
In order to solve the technical problems, the invention provides a pressure maintaining system and an intelligent control method, and aims to solve the problems that a steady-state fixed consumption load is not matched with the output power of pressure maintaining equipment, namely the system pressure is caused by the fact that the speed of steady-state fixed consumption reduction is not matched with the pressure capacity of the pressure maintaining equipment, the pressure maintaining equipment is frequently started, stopped or unloaded, the abrasion consumption of equipment components is intensified, the service life of the pressure maintaining equipment is influenced, meanwhile, energy loss is caused, the energy efficiency and the economical efficiency of the system are influenced, and the like.
The technical scheme adopted by the invention is as follows:
a pressure maintenance system, the system comprising: a pressure vessel, a pressureless vessel, a pressure maintenance device; the pressure container is connected with the non-pressure container through pressure maintaining equipment;
the pressure vessel is provided with a first sensor for acquiring physical quantity parameters of the pressure vessel, such as the pressure of the pressure vessel of the pressure maintenance system;
the non-pressure container is provided with a second sensor for collecting physical quantity parameters of the non-pressure container;
the first sensor, the second sensor and the pressure maintaining equipment are connected with a controller, and the controller is connected with the human-computer interaction device.
The pressure container is a pressure oil tank or a gas tank.
The non-pressure container is a non-pressure oil tank or an air bag.
The pressure maintaining equipment is n fixed-frequency oil pumps or air compressors with incompletely same model specifications, and the n fixed-frequency oil pumps or the air compressors are respectively 1# and 2# … … n # according to the sequence from small to large of the pressurizing capacity.
The controller receives the corresponding pressurizing capacity information p1, p2, … and pn of n fixed frequency oil pumps or air compressors in the pressure maintaining equipment arranged by the man-machine interaction device, wherein p1 is less than p2 is less than … is less than pn; and according to the state signal of the pressure maintenance system collected by the sensor, after logical processing is carried out by adopting an intelligent control method of the pressure maintenance system, n fixed-frequency oil pumps or air compressors with different models and specifications in the pressure maintenance equipment are controlled by an electric loop, and meanwhile, the state information of the pressure maintenance system is transmitted to a man-machine interaction device.
The man-machine interaction device is communicated with the controller, the information of the pressurizing capacity of n fixed-frequency oil pumps or air compressors in the pressure maintaining equipment arranged by a user through the man-machine interaction device is transmitted to the controller, and meanwhile, the man-machine interaction device acquires the parameter information of the pressure maintaining system sent by the controller to carry out graphical display.
An intelligent control method of a pressure maintenance system comprises the following steps:
step 1, initializing a controller 6, and acquiring rated pressure P set by a user through a man-machine interaction device 7Forehead (forehead)Starting up of the standby-equipment pressure PPrepare forThe pressure maintaining apparatus 4 includes pressure capacity information p1, p2, …, pn corresponding to n constant frequency oil pumps or air compressors. p1 is not less than p2 is not less than … is not less than pn.
Step 2, the controller 6 controls n oil pumps or air compressors to operate and load, and the pressure maintenance system is pressurized to the rated pressure PForehead (forehead)And then stopping the operation of the n oil pumps or the air compressors.
And 3, collecting the pressure maintaining system pressure P1 by the controller 6, and starting timing.
And 4, detecting whether the timing is finished for t minutes by the controller 6, if so, entering the step 5, and otherwise, continuously detecting.
Step 5, the controller 6 collects the pressure maintenance system pressure P2.
Step 6, the controller 6 calculates the steady-state fixed consumption load P of the pressure maintenance system as (P1-P2)/t.
And 7, if pi is less than or equal to p < pj, starting an i # oil pump or an air compressor as main pressurizing equipment to operate and load for a long time, and entering the step 10. pi and pj are the information of the pressurizing capacity of two devices i # and j # adjacent in sequence number among n constant frequency oil pumps or air compressors in the pressure maintenance device 4. Otherwise, go to step 8.
And 8, if p is less than p1, starting the 1# oil pump or air compressor as the main pressurizing equipment to operate and load for a long time, and entering the step 10. Otherwise, go to step 9.
And 9, starting the n # oil pump or the air compressor as main pressurizing equipment to operate and load for a long time, and entering step 10.
And step 10, entering a conventional control mode. I.e. the controller 6 detects that the pressure is maintaining the system pressure down to the priming device pressure PPrepare forWhen the pressure of the system is detected to be increased to the rated pressure P, the residual standby pressurizing equipment is alternately started to be loadedForehead (forehead)When so, all the spare pressurizing apparatuses are stopped. Alternate method detailed in figure 3 is an intelligent queuing alternate operating method with multiple operating pumps and multiple backup pumps.
The invention discloses a pressure maintaining system and an intelligent control method, which have the following technical effects:
the pressure maintaining system is designed with fixed-frequency oil pumps or air compressors with different pressurizing capacities as pressure maintaining equipment so as to be suitable for the condition that steady-state fixed consumption loads are in different size ranges, and therefore the pressure maintaining system has wide adaptability.
By adopting the intelligent control method of the pressure maintenance system, on the premise of adopting the fixed-frequency oil pump or the air compressor, an optimization algorithm is adopted, and the fixed-frequency oil pump or the air compressor which is close to the load capacity is selected as the main pressurizing equipment to operate and load for a long time as far as possible according to the calculated steady-state fixed consumption load, so that the stability of the pressure of a control object is improved, the pressure change speed is reduced as far as possible, the stability of the pressure is ensured, the frequent starting, stopping, loading and unloading of the pressure maintenance equipment are avoided, the abrasion consumption of the original components of the equipment is reduced, the service life of the pressure maintenance equipment is prolonged, the energy consumption of the pressure maintenance system is reduced. Therefore, the method has good control performance and economy.
By adopting the pressure maintenance system and the intelligent control method, the problems that the steady-state fixed consumption load of the pressure maintenance system is not matched with the output power of the pressure maintenance equipment, namely the system pressure is not matched with the pressurizing capacity of the pressure maintenance equipment due to the fact that the descending speed of the steady-state fixed consumption is not matched with the pressure maintenance equipment, the pressure maintenance equipment is frequently started, stopped or unloaded, the abrasion consumption of equipment components is aggravated, the service life of the pressure maintenance equipment is influenced, meanwhile, the energy loss is caused, the energy efficiency and the economical efficiency of the system are influenced and the like can be.
Drawings
FIG. 1 is a schematic diagram of a pressure maintenance system according to the present invention.
FIG. 2 is a flow chart of the intelligent control method of the present invention.
Fig. 3 is a flow chart of an intelligent queuing alternate working method of a plurality of working pumps and a plurality of standby pumps.
Detailed Description
As shown in fig. 1, a pressure maintenance system includes a plurality of fixed-frequency oil pumps or air compressors with different models and specifications and different pressurization capacities as pressure maintenance equipment 4, and further includes a pressure container 1, a non-pressure container 2, a pipeline 3, a sensor 5, a controller 6, a human-computer interaction device 7, an electrical circuit 8, and a communication circuit 9. The sensor 5 includes a first sensor and a second sensor.
The pressure container 1 is a pressure oil tank or a pressure gas tank.
The non-pressure container 2 is a non-pressure oil tank or an air bag.
The pressure vessel 1 is connected to a pressure maintenance device 4 by a pipeline, and the pressureless vessel 2 is connected to the pressure maintenance device 4 by a pipeline 3.
The pressure maintaining equipment 4 is n fixed-frequency oil pumps or air compressors with different models and specifications, and the n fixed-frequency oil pumps or air compressors are respectively 1# and 2# … … n # according to the sequence from small to large of the pressurizing capacity.
The sensor 5 collects physical quantity parameters of the pressure container 1 and the pressureless container 2 in the pressure maintenance system, such as the pressure of the pressure container of the pressure maintenance system.
The controller 6 receives the information p1, p2, …, pn of the pressurizing capacity corresponding to n fixed-frequency oil pumps or air compressors in the pressure maintaining equipment 4 arranged by the man-machine interaction device 7 through the communication circuit 9, (p1< p2< … < pn), and controls the n fixed-frequency oil pumps or air compressors with incompletely same specification in the pressure maintaining equipment 4 through the electric circuit 8 after logic processing is carried out by adopting an intelligent control method of the pressure maintaining system according to the state signal of the pressure maintaining system collected by the sensor 5 received by the electric circuit 8, and simultaneously transmits the state information of the pressure maintaining system to the man-machine interaction device 7 through the communication circuit 9.
The human-computer interaction device 7 communicates with the controller 6. The information of the pressurizing capacity of n fixed-frequency oil pumps or air compressors in the pressure maintaining equipment 4 arranged by a user through the human-computer interaction device 7 is transmitted to the controller 6, and meanwhile, the human-computer interaction device 7 acquires the parameter information of the pressure maintaining system sent by the controller 6 for graphical display.
The pressure maintenance device 4 is connected with the controller 6 through an electric circuit 8; the sensor 5 is connected with the controller 6; and the transmission of the state signal and the control signal is realized.
The controller 6 is connected with the man-machine interaction device 7 through the communication loop 9, and transmission of pressurization capacity information and state information is achieved.
The sensor 5 is a pressure transmitter with a brand of KELLER and a model number of PA.23SY/100 bar/81594.55.
The controller 6 is a PLC controller with the model number of 140CPU67160 and the brand number of Schneider.
The man-machine interaction device 7 adopts a touch screen with the brand name of Schneider and the model number of XBTGT 7340.
The electric loop 8 adopts a universal national standard cable.
The communication loop 9 adopts a universal Ethernet network cable.
The fixed-frequency oil pump motor adopts a fixed-frequency motor with the brand ABB and the model M3BP series.
The fixed frequency air compressor adopts a DG series piston middle-high pressure air compressor with a Brand of Delier and the model of DG0.8/100, DG3/100DG, DG5.5/100 and the like.
As shown in fig. 2, an intelligent control method for a pressure maintenance system includes the following steps:
step 1, initializing a controller 6, and acquiring rated pressure P set by a user through a man-machine interaction device 7Forehead (forehead)Starting up of the standby-equipment pressure PPrepare forThe pressure maintaining apparatus 4 includes pressure capacity information p1, p2, …, pn corresponding to n constant frequency oil pumps or air compressors. p1≤p2≤…≤pn。
Step 2, the controller 6 controls n oil pumps or air compressors to operate and load, and the pressure maintenance system is pressurized to the rated pressure PForehead (forehead)And then stopping the operation of the n oil pumps or the air compressors.
And 3, collecting the pressure maintaining system pressure P1 by the controller 6, and starting timing.
And 4, detecting whether the timing is finished for t minutes by the controller 6, if so, entering the step 5, and otherwise, continuously detecting.
Step 5, the controller 6 collects the pressure maintenance system pressure P2.
Step 6, the controller 6 calculates the steady-state fixed consumption load P of the pressure maintenance system as (P1-P2)/t.
And 7, if pi is less than or equal to p < pj, starting an i # oil pump or an air compressor as main pressurizing equipment to operate and load for a long time, and entering the step 10. pi and pj are the information of the pressurizing capacity of two devices i # and j # adjacent in sequence number among n constant frequency oil pumps or air compressors in the pressure maintenance device 4. Otherwise, go to step 8.
And 8, if p is less than p1, starting the 1# oil pump or air compressor as the main pressurizing equipment to operate and load for a long time, and entering the step 10. Otherwise, go to step 9.
And 9, starting the n # oil pump or the air compressor as main pressurizing equipment to operate and load for a long time, and entering step 10.
And step 10, entering a conventional control mode. I.e. the controller 6 detects that the pressure is maintaining the system pressure down to the priming device pressure PPrepare forWhen the pressure of the system is detected to be increased to the rated pressure P, the residual standby pressurizing equipment is alternately started to be loadedForehead (forehead)When so, all the spare pressurizing apparatuses are stopped. Alternate startup method referring to fig. 3, an intelligent queuing alternate operation method with multiple operating pumps and multiple standby pumps is shown.
As shown in fig. 3, an intelligent queuing alternate working method of multiple working pumps and multiple standby pumps includes the following steps:
the method comprises the following steps: and initializing, and determining the number i of the working pumps of the system and the total number j of the pumps.
Step two: and collecting multiple working condition factors of all pumps and determining various working condition values of all pumps.
Step three: and (4) carrying out weight sequencing according to various working condition factors of all the pumps, and determining the weight values of various working condition factors of all the pumps.
Step IV: and calculating the priority score of each pump according to the working condition values corresponding to the various working condition factors of all the pumps and the weight values corresponding to the corresponding working condition factors.
Step five: prioritizing all pumps in the system according to the priority score of each pump;
step (c): according to the priority sequence of all pumps, the first i pumps with the priority sequence from high to low are taken as working pumps, and other j-i pumps are taken as standby pumps;
step (c): and detecting the running states of all the pumps, and if any pump stops running, returning to the step II.
In the second step, the multiple working condition factors include: the operation times of the pump, whether the pump can work normally or not, and the operation state of the pump is manually set by a handle of 'active', 'standby' or 'cut'. The steps of the invention take the three working condition factors as examples, and the working condition factors can be expanded according to the actual application condition in actual application.
The various operating conditions of all pumps are as follows:
in all the pumps, if the pumps can work normally, the working condition value X is 1; if the pump can not work normally, the working condition value X is 0. Setting the working condition value of the n number pump as Xn；
In all the pumps, if the pumps can work normally, the working condition value X is 1; if the pump can not work normally, the working condition value X is 0. Setting the working condition value of the n number pump as Xn。
In all pumps, if the operating state of the pump is manually set as 'main use', the value of the state working condition value Y is 2; if the operating state handle of the pump is manually set as 'standby', the working condition value Y of the state is 1; if the operating state handle of the pump is artificially set to be cut off, the state working condition value Y is 0. The reason for taking the value is that the operating state of the pump is manually set to have higher priority than the main operationSet to "Standby", the artificial setting to "Standby" has a higher priority than the artificial setting to "cut". Setting the state working condition value of the n number pump as Yn。
In all the pumps, the operation times of the pumps are sequenced, and the pump time working condition values Z corresponding to the times from high to low are sequentially 1, 2 … … 5 and 6. The number working condition value of the n number pump is set as Zn。
In the step 3, the importance of three factors considered by the pump alternation is that: whether the pump can work normally or not, the running state handle of the pump is manually set in a primary mode, a standby mode or a cutting mode, and the running times of the pump are counted;
setting the weight value a of 100 for the normal operation of the pump;
the running state of the pump is characterized in that the weight value b of the handle which is manually set as 'primary', 'standby' or 'cut-off' is 10;
the weighted value c of the number of pump operations is 1.
In the step (iv), the priority score M ═ aX + bY + cZ ═ 100X +10Y + Z is calculated for each pump; the priority score M for pump number nn＝100Xn+10Yn+Zn。
In the fifth step, according to MnThe size of the pump, the priority score M of the number n pumpnThe larger the priority, the more forward it will be in the queue, let M ben1≧Mn2≧Mn3≧Mn4≧Mn5≧Mn6Then the priority ranking is as follows: n1, n2, n3, n4, n5 and n 6.
Example (b):
the invention is applied to the start-stop control of the oil pump of the hydraulic system of the speed regulator of a certain power station. 4 oil pumps are designed in the system, wherein 1 pump is started to serve as a main working pump and the other 3 pumps serve as standby pumps during normal work. The method of the present invention will be described in detail below with reference to the examples.
The method for controlling the oil pump of the hydraulic system of the speed regulator of a certain power station comprises the following detailed steps:
1. controller of speed regulator hydraulic system for initialization and collectionRated pressure P set by user through man-machine interaction deviceForehead (forehead)Starting up of the standby-equipment pressure PPrepare forThe corresponding pressurizing capacity information of the 4 oil pumps is 0.1Mpa/min, 0.2Mpa/min, 0.3Mpa/min and 0.4 Mpa/min.
2. The speed regulator hydraulic system controller controls 4 oil pumps to operate and load, builds the pressure of the speed regulator hydraulic system to a rated pressure P amount, and then stops the 4 oil pumps from operating.
3. The governor hydraulic system controller detects and collects governor hydraulic system pressure P1 and starts timing.
4. And (5) detecting whether the timing is finished for t minutes by a speed regulator hydraulic system controller, if so, entering the step 5, and otherwise, continuously monitoring.
5. The governor hydraulic system controller detects and collects governor hydraulic system pressure P2.
6. And the governor hydraulic system controller calculates the steady-state fixed consumption load P of the governor hydraulic system to be (P1-P2)/t.
7. If p is more than or equal to 0.1 and less than 0.2, starting a No. 1 oil pump as main pressurizing equipment to operate and load for a long time, and entering the step 10; if p is more than or equal to 0.2 and less than 0.3, starting a No. 2 oil pump as main pressurizing equipment to operate and load for a long time, and entering the step 10; if p is more than or equal to 0.3 and less than 0.4, starting a No. 3 oil pump as main pressurizing equipment to operate and load for a long time, and entering the step 10; otherwise, step 8 is entered.
8. If p is less than 0.1, starting the 1# oil pump as the main pressurizing equipment for long-term operation loading, and entering the step 10. Otherwise, step 9 is entered.
9. Starting the 3# oil pump as the main pressurizing equipment to operate and load for a long time, and entering the step 10.
10. A normal control mode is entered. That is, the controller of the hydraulic system of the speed regulator detects that the pressure of the hydraulic system of the speed regulator is reduced to the pressure P of the starting pumpPrepare forWhen the pressure of the hydraulic system of the speed regulator is detected to rise to the rated pressure P, the residual spare oil pump is started to load in turnForehead (forehead)When it is time, all the backup oil pumps are stopped. The rotating method is shown in detail in fig. 3, which is an intelligent queuing rotating operating method for a plurality of operating pumps and a plurality of standby pumps.
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