CN114294151A - Combined regulating and controlling system and method for speed regulator and converter of stepless speed change pumped storage power station - Google Patents
Combined regulating and controlling system and method for speed regulator and converter of stepless speed change pumped storage power station Download PDFInfo
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Abstract
The invention discloses a combined regulation and control system and a method for a speed regulator and a converter of a stepless speed change pumped storage power station, wherein the combined regulation and control system comprises a hardware part and a software part, the hardware part comprises a controller, a communication module, an analog quantity input module, a switching value input module, a manual input module and a display module, the software part comprises an automatic combination module and a manual combination module, the controller solves and obtains an optimal guide vane opening signal and an optimal mechanical rotating speed signal, the automatic combination module and the manual combination module are arranged in the controller, the stepless speed change pumped storage power station is automatically controlled through the automatic combination module, and an operator manually controls the stepless speed change pumped storage power station through the manual combination module. According to the invention, an optimal guide vane opening signal and an optimal mechanical rotating speed signal can be obtained, automatic combined regulation and control are realized, and mechanical rotating speed and guide vane opening can be set on the display module to realize manual combined regulation and control.
Description
Technical Field
The invention relates to the field of hydroelectric generation control, in particular to a combined regulation and control system and method for a speed regulator and a converter of a stepless speed change pumped storage power station.
Background
Pumped storage is an important means for supporting the development of new energy. However, the conventional constant-speed pumped storage unit has the disadvantages of narrow operation range, slow power response, low weighting efficiency and the like, and the requirement of a future power system is difficult to meet, so that the pumped storage unit needs to be upgraded urgently. The continuous variable-speed pumped storage technology is a new development direction of the global pumped storage industry due to the advantages of rapidity, high efficiency, flexibility, reliability and the like of operation and adjustment.
The variable-speed pumped storage unit realizes flexible and controllable operation track line through variable-speed regulation, but simultaneously brings a new problem of cooperative control of a speed regulator and a converter, which does not exist in the conventional unit. How to realize the optimal combination of the opening degree of the guide vane and the mechanical rotating speed is the key for ensuring the efficient and stable operation of the variable-speed pumped storage unit.
In the related technology, a research means of variable-speed pumped storage unit combined operation mainly adopts theoretical modeling and a numerical simulation method, and the proposed method is such as a self-adaptive coordination control method based on a unit operation characteristic curve, an improved optimal rotating speed optimizing strategy for seeking minimum unit flow by an equal unit power line, an optimal efficiency interpolation solving strategy and the like, and has important significance and reference value for variable-speed pumped storage unit combined control and efficient operation.
However, a mature variable-speed pumped storage unit combined regulation and control system does not exist in the prior art, and the combined control research based on numerical simulation lacks a real machine model experiment and field actual measurement verification, which directly limits the application of the research result in an actual variable-speed pumped storage power station.
Disclosure of Invention
According to the defects of the prior art, the invention aims to provide a combined regulating and controlling system and a method for a speed regulator and a converter of a stepless speed change pumped storage power station, which are used for obtaining an optimal guide vane opening signal and an optimal mechanical rotating speed signal and realizing the automatic combination of a speed regulator device and a converter device; the manual combination can be realized by independently setting the mechanical rotating speed and the guide vane opening degree on the manual input module, the standby function can be borne when the automatic combination fails, and the user preference and flexibility requirements of operators can be met.
In order to solve the technical problems, the invention adopts the technical scheme that:
a combined regulation and control system of a speed regulator and a current transformer for a stepless speed change pumped storage power station, wherein the stepless speed change pumped storage power station comprises a variable speed pumped storage unit, a speed regulator device, a current transformer device, a combined regulation and control system and a monitoring device, the combined regulation and control system comprises a hardware part and a software part, the hardware part comprises a controller, a communication module, an analog quantity input module, a switching value input module, a manual input module and a display module, and the software part comprises an automatic combination module and a manual combination module;
the controller is used for controlling the stepless speed change pumped storage power station and solving to obtain an optimal guide vane opening signal and an optimal mechanical rotating speed signal;
the analog input module comprises a power transmitter, a pressure sensor and a signal conditioning circuit, wherein the signal conditioning circuit processes a signal acquired by the pressure sensor to enable the signal to meet the signal requirement of the analog input module;
the switching value input module is used for judging the operation working conditions of the variable-speed pumped storage unit, and the operation working conditions of the variable-speed pumped storage unit comprise a pumping working condition and a power generation working condition;
the manual input module is used for an operator to manually input parameters;
the display module is used for displaying the information of the stepless speed change pumped storage power station;
the communication module is used for communicating the control module with the speed regulator device, the current transformer device, the monitoring device, the manual input module and the display module;
the automatic combination module and the manual combination module are arranged in the controller, the stepless speed change pumped storage power station is automatically controlled through the automatic combination module, and an operator manually controls the stepless speed change pumped storage power station through the manual combination module.
Furthermore, the combined regulation and control system comprises a remote mode and a local mode, the remote mode is used for receiving an operation command sent by the monitoring device remotely and used as an input command of the combined regulation and control system, the display module displays the operation command sent by the monitoring device remotely, the local mode inputs the operation command through the manual input module, the display module displays the operation command input by the manual input module, and the operation command comprises a pumping mode, a power generation mode and an active setting signal of the variable-speed pumped storage unit.
Further, the controller is a PLC.
Further, when the working condition state obtained by the communication of the monitoring device is inconsistent with the working condition state acquired by the joint regulation and control system through the switching value input module, the display module displays that the working condition state does not correspond to the fault and stops running.
A combined regulation and control method of a speed regulator and a converter for a stepless speed change pumped storage power station comprises the following steps:
the method comprises the steps that firstly, a first combined operation table and a second combined operation table are formed in advance, the first combined operation table comprises variable-speed pumped storage unit power, a working water head and an optimal mechanical rotating speed, and the second combined operation table comprises variable-speed pumped storage unit power, a working water head and an optimal guide vane opening degree;
secondly, the controller obtains a variable-speed pumped storage unit power setting signal and a working condition instruction signal from the monitoring device;
and step three, the controller obtains an optimal guide vane opening signal and an optimal mechanical rotating speed signal through real-time solution, transmits the optimal guide vane opening signal to the speed regulator device, and transmits the optimal mechanical rotating speed signal to the converter device.
Further, the method for solving the optimal mechanical rotating speed by the controller comprises the following steps:
step S101, dividing an interpolation grid, and dividing a plane of the variable-speed pumped storage unit power P-working head H into a plurality of equidistant grids;
step S102, according to the first combined operation table, obtaining input values S corresponding to four vertexes of each square1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And a mechanical speed n1、n2、n3And n4；
Step S103, according to the input values S of four vertexes of each square1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And an output value n1、n2、n3And n4Obtaining interpolation coefficients a, b, c and d of each square:
obtaining interpolation coefficients of all the squares according to the mechanical rotating speed;
step S104, acquiring a current working water head signal, an active setting signal of the variable-speed pumped storage unit obtained by communicating with the monitoring device or an active setting signal of the variable-speed pumped storage unit input by a manual input module to obtain an input value S (p, h), positioning to a corresponding grid, taking out four interpolation coefficients of the grid, and obtaining an optimal mechanical rotating speed n according to the following formula:
n＝a+bp1+ch1+dp1h1
if the input value happens to fall on the top of the square, the square at the lower left corner of the input value is selected as the corresponding square.
Further, the method for solving the optimal guide vane opening degree by the control module comprises the following steps:
step S201, dividing an interpolation grid, and dividing a plane of the variable-speed pumped storage unit power P-working head H into a plurality of equidistant grids;
step S202, according to the second combined operation table, obtaining input values S corresponding to four vertexes of each square1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And opening y of guide vane1、y2、y3And y4；
Step S203, according to the input values S of four vertexes of each square1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And the output value y1、y2、y3And y4Obtaining interpolation coefficients e, f, l and m of each square:
obtaining interpolation coefficients of all the squares according to the opening degree of the guide vanes;
step S204, acquiring a current working water head signal, an active setting signal of the variable-speed pumped storage unit obtained by communicating with the monitoring device or an active setting signal of the variable-speed pumped storage unit input by a manual input module to obtain an input value S (p, h), positioning to a corresponding grid, taking out four interpolation coefficients of the grid, and obtaining an optimal guide vane opening y according to the following formula:
y＝e+fp+lh+mph
if the input value just falls on the top of the square grid, the grid at the lower left corner of the input value is selected as the corresponding grid.
Furthermore, the range of the working water head H is 23-33 m, and the range of the power P of the variable-speed pumped storage unit is 30-80 kW.
Furthermore, the automatic combination is realized by the optimal guide vane opening value and the optimal mechanical rotating speed value obtained by tracking the actual guide vane opening and the actual mechanical rotating speed of the variable-speed pumped storage unit.
Further, the variable-speed pumped storage unit dynamic characteristic experiment table obtains a first combined operation table and a second combined operation table by adopting a method based on a BP neural network and a variable-speed evolution rule.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention relates to a combined regulating and controlling system and a method of a speed regulator and a converter for a stepless speed change pumped storage power station, which are key devices for realizing the combined control of the converter device and the speed regulator device, can obtain an optimal guide vane opening signal and an optimal mechanical rotating speed signal, and realize the automatic combination of the speed regulator device and the converter device; the automatic combination system can also realize manual combination by independently setting mechanical rotating speed and guide vane opening on a manual input module, can bear standby function when the automatic combination fails, can meet the user preference and flexibility requirements of operators, and can be well applied to double-fed asynchronous motor variable-speed pumped storage power stations and synchronous motor full-power variable-speed pumped storage power stations.
2. According to the system and the method for jointly regulating and controlling the speed regulator and the converter of the stepless speed change pumped storage power station, the actual guide vane opening and mechanical rotation speed dynamic response of the variable speed pumped storage unit can quickly and accurately track the optimal guide vane opening value and the optimal mechanical rotation speed value, so that the mechanical rotation speed and the guide vane opening of the variable speed pumped storage unit can be flexibly and accurately regulated, the variable speed pumped storage unit can always run at the optimal efficiency working point, the efficient running of the variable speed pumped storage unit is ensured, the transition process of the volute pressure and the tail water pressure of the variable speed pumped storage unit is mainly influenced by the guide vane opening regulation and is secondly influenced by the rotation speed regulation, and the water attack pressure amplitude can meet the calculation requirement of the unit regulation and guarantee by flexibly and accurately regulating the mechanical rotation speed and the guide vane opening of the variable speed pumped storage unit.
Drawings
Fig. 1 is a general structure and signal flow diagram of the present invention.
FIG. 2 is a field diagram of a display module according to the present invention.
FIG. 3 is a joint interpolation grid partition diagram of the present invention;
fig. 4 is an optimal joint operation table of the present invention.
FIG. 5 is an effect diagram of the present invention applied to a variable speed pumped storage dynamic property physical model experiment table.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
A combined regulation and control system of a speed regulator and a current transformer for a stepless speed change pumped storage power station is disclosed, and shown in figure 1, the stepless speed change pumped storage power station comprises a variable speed pumped storage unit, a speed regulator device, a current transformer device, a combined regulation and control system and a monitoring device, the combined regulation and control system comprises a hardware part and a software part, the hardware part comprises a controller, a communication module, an analog quantity input module, a switching value input module, a manual input module and a display module, and the software part comprises an automatic combined module and a manual combined module;
the controller is used for controlling the stepless speed change pumped storage power station and solving to obtain an optimal guide vane opening signal and an optimal mechanical rotating speed signal;
the analog input module comprises a power transmitter, a pressure sensor and a signal conditioning circuit, wherein the signal conditioning circuit processes a signal acquired by the pressure sensor to enable the signal to meet the signal requirement of the analog input module;
the switching value input module is used for judging the operation condition of the variable-speed pumped storage unit, and the operation condition of the variable-speed pumped storage unit comprises a pumping condition and a power generation condition;
the manual input module is used for manually inputting parameters by an operator;
the display module is used for displaying information of the stepless speed change pumped storage power station;
the communication module is used for communicating the control module with the speed regulator device, the converter device, the monitoring device, the manual input module and the display module;
the automatic combination module and the manual combination module are both arranged in the controller, the stepless speed change pumped storage power station is automatically controlled through the automatic combination module, and an operator manually controls the stepless speed change pumped storage power station through the manual combination module.
The variable-speed pumped storage unit can pump water and generate electricity.
The speed regulator device is connected with a water pump turbine guide vane of the variable-speed pumped storage unit and is used for regulating the flow of the variable-speed pumped storage unit.
The converter device is connected with a double-fed asynchronous motor of the variable-speed pumped storage unit and is used for alternating current excitation and grid connection regulation of the generator motor.
The monitoring device is used for implementing the functions of operation management, data processing, real-time monitoring and control on the whole physical model experiment device.
Specifically, the combined regulation and control system comprises a remote mode and a local mode, the remote mode is used for receiving an operation command sent by a monitoring device remotely and serving as an input command of the combined regulation and control system, a display module displays the operation command sent by the monitoring device remotely, the local mode inputs the operation command through a manual input module, the display module displays the operation command input by the manual input module, and the operation command comprises a pumping mode, a power generation mode and an active setting signal of the variable-speed pumped storage unit.
The remote mode and the local mode are switched by a switching knob on the combined regulation and control system.
The controller obtains an active setting signal and a working condition instruction signal of the variable-speed pumped storage unit from the monitoring device; the controller obtains an optimal guide vane opening signal and an optimal mechanical rotating speed signal through real-time solution, transmits the optimal guide vane opening signal to the speed regulator device through optical fiber communication, and transmits the optimal mechanical rotating speed signal to the converter device through optical fiber communication.
In the invention, the controller is a PLC. The PLC selects Siemens PLC S7-1500.
The controller adopts RS485 communication, transmits information such as operating parameters to the display module for real-time display, and the display module sends instruction signals to the PLC in the local mode.
In the invention, the analog input module comprises a high-precision alternating current sampling power transmitter, a microphone pressure sensor and a signal conditioning circuit, wherein the signal conditioning circuit comprises ISO124 isolation, voltage following, resistance voltage division and UAF42 low-pass filtering, and signals acquired by the sensor are isolated and filtered to meet the signal requirements of the analog input module.
The switching value input module is used for acquiring the closing states of a power generation contactor and a pumping contactor of the variable-speed pumped storage unit, judging the operation working condition of the variable-speed pumped storage unit, and directly sending a mechanical rotating speed signal to the switching value input module through the signal conditioning circuit by residual voltage frequency measurement (sine wave) or fluted disc frequency measurement (square wave).
Referring to fig. 2, the display module is configured to display, in real time, operation information acquired by the combined control system from the communication module, the analog input module, and the switching value input module, including but not limited to a power feedback value of the variable-speed pumped storage unit, a power set value of the variable-speed pumped storage unit, a current working head, an optimal guide vane opening, an actual guide vane opening, an optimal mechanical rotational speed, an actual mechanical rotational speed, a working condition state, and the like; in the local mode, the manual input module and the display module are also provided with a variable speed pumped storage unit power set value window manual input module and a display module which are also provided with an optimal guide vane opening signal and an optimal mechanical rotating speed signal setting window which are manually combined, and the manual input module and the display module are used for being flexibly set by an operator according to self requirements under the condition that the optimal guide vane opening and the optimal mechanical rotating speed are known or the debugging experiment operation condition is adopted.
In the invention, the display module and the manual input module are realized together through the touch screen.
The invention also provides a combined regulation and control method of the speed regulator and the converter for the stepless speed change pumped storage power station, and the combined regulation and control system provided by the invention comprises the following steps:
the method comprises the steps that firstly, a first combined operation table and a second combined operation table are formed in advance, the first combined operation table comprises variable-speed pumped storage unit power, a working water head and an optimal mechanical rotating speed, and the second combined operation table comprises variable-speed pumped storage unit power, a working water head and an optimal guide vane opening degree;
secondly, the controller obtains a variable-speed pumped storage unit power setting signal and a working condition instruction signal from the monitoring device;
and step three, the controller obtains an optimal guide vane opening signal and an optimal mechanical rotating speed signal through real-time solution, transmits the optimal guide vane opening signal to the speed regulator device, and transmits the optimal mechanical rotating speed signal to the converter device.
As shown in fig. 4, in the embodiment of the present invention, the first join operation table and the second join operation table are merged into one table.
According to the invention, the communication module adopts optical fiber communication, the controller obtains a power setting signal and a working condition instruction signal of the variable-speed pumped storage unit from the monitoring device through the optical fiber communication, the controller transmits an optimal guide vane opening signal to the speed regulator device through the optical fiber communication, and transmits an optimal mechanical rotating speed signal to the converter device through the optical fiber communication.
The method for solving the optimal mechanical rotating speed by the control module comprises the following steps:
step S101, dividing a control module interpolation grid, and dividing a variable-speed pumped storage unit power P-working head H plane into a plurality of equidistant squares as shown in figure 3, wherein the working head H range is 23-33 m, and the variable-speed pumped storage unit power P range is 30-80 kW;
step S102, according to the first combined operation table, obtaining input values S corresponding to four vertexes of each square1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And a mechanical speed n1、n2、n3And n4；
Step S103, according to the input values S of four vertexes of each square1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And an output value n1、n2、n3And n4Obtaining interpolation coefficients a, b, c and d of each square:
obtaining interpolation coefficients of all the squares according to the mechanical rotating speed;
step S104, acquiring a current working water head signal, an active setting signal of the variable-speed pumped storage unit obtained by communicating with the monitoring device or an active setting signal of the variable-speed pumped storage unit input by a manual input module to obtain an input value S (p, h), positioning to a corresponding grid, taking out four interpolation coefficients of the grid, and obtaining an optimal mechanical rotating speed n according to the following formula:
n＝a+bp1+ch1+dp1h1
if the input value happens to fall on the top of the square, the square at the lower left corner of the input value is selected as the corresponding square.
In one embodiment of the invention, the combined regulation and control system monitors that the current working water head is 30m, the upper computer sets the power of the variable-speed pumped storage unit to be 68KW, the combined regulation and control system positions a square grid corresponding to the working condition point to be an area with horizontal coordinates P7-P8 and vertical coordinates H7-H8 in fig. 4, the combined regulation and control system regulates optimal rotating speed interpolation coefficients a, b, c and d stored in the square grid, and the optimal rotating speed interpolation coefficients a, b, c and d are stored according to the condition that n is a + bp1+ch1+dp1h1And solving to obtain the optimal mechanical rotating speed, and transmitting the optimal mechanical rotating speed to the converter device by the controller through optical fiber communication to adjust the rotating speed.
The method for solving the optimal guide vane opening degree by the control module comprises the following steps:
step S201, dividing a control module interpolation grid, and dividing a variable-speed pumped storage unit power P-working head H plane into a plurality of equidistant squares as shown in figure 3, wherein the working head H range is 23-33 m, and the variable-speed pumped storage unit power P range is 30-80 kW;
step S202, according to the second combined operation table, obtaining input values S corresponding to four vertexes of each grid respectively1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And opening y of guide vane1、y2、y3And y4；
Step S203, according to the input values S of four vertexes of each mesh1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And the output value y1、y2、y3And y4Obtaining interpolation coefficients e, f, l and m of each grid:
obtaining interpolation coefficients of all grids according to the opening degree of the guide vane;
step S204, acquiring a current working head signal, an active setting signal of the variable-speed pumped storage unit obtained by communicating with the monitoring device or an active setting signal of the variable-speed pumped storage unit input by a manual input module to obtain an input value S (p, h), positioning to a corresponding grid, taking out four interpolation coefficients of the grid, and obtaining an optimal guide vane opening y according to the following formula:
y＝e+fp+lh+mph
if the input value just falls on the top point of the grid, the square at the lower left corner of the input value is selected as the corresponding grid side.
In one embodiment of the invention, a combined regulation and control system monitors a current working water head to be 24.5m, an upper computer sets the power of a variable-speed pumped storage unit to be 38KW, the combined regulation and control system positions a square grid corresponding to a working condition point to be an area with horizontal coordinates P1-P2 and vertical coordinates H1-H2 in a graph 4, the combined regulation and control system regulates optimal rotating speed interpolation coefficients e, f, l and m stored in the square grid, the optimal guide vane opening is obtained by solving according to y ═ e + fp + lh + mph, and a controller transmits the optimal guide vane opening to a speed regulator device through optical fiber communication to regulate the opening.
In the invention, in the actual operation of the combined regulation and control system, a first combined operation table and a second combined operation table are required to be formed in advance, the first combined operation table comprises variable-speed pumped storage unit power, a working water head and an optimal mechanical rotation speed, the second combined operation table comprises variable-speed pumped storage unit power, a working water head and an optimal guide vane opening, and the corresponding optimal mechanical rotation speed and the optimal guide vane opening are solved according to different first combined operation tables and second combined operation tables.
The transition process dynamic response of the variable-speed pumped storage unit under the automatic combination of the controller is shown in fig. 5, according to the current working water head and the power set value of the variable-speed pumped storage unit, the combined regulation and control system solves the optimal guide vane opening value and the optimal mechanical rotating speed value in real time, the actual guide vane opening and mechanical rotating speed dynamic response of the variable-speed pumped storage unit can quickly and accurately track the optimal guide vane opening value and the optimal mechanical rotating speed value, the rotating speed and the opening are flexibly and accurately regulated, the variable-speed pumped storage unit always operates at the optimal efficiency working point, and the efficient operation of the variable-speed pumped storage unit is ensured; the transition process of the volute pressure and the tail water pressure is mainly influenced by the adjustment of the opening of the guide vane and is influenced by the adjustment of the rotating speed, and the water attack pressure amplitude meets the calculation requirement of the adjustment guarantee of the unit; as can be seen from the graph 5, the pressure pulsation amplitude of the bladeless region of the variable-speed pumped storage unit can be effectively reduced by adjusting the mechanical rotating speed, and the safe and reliable operation of the variable-speed pumped storage unit is facilitated. Compared with a constant-speed pumped storage unit which can only operate at a synchronous rotating speed, the variable-speed pumped storage unit realizes the active adjustment of the mechanical rotating speed, thereby not only improving the operating efficiency and reducing the pressure pulsation of the unit, but also improving the dynamic quality of the transition process.
The manual combination of the software part of the combined controller is that an operator can directly set the mechanical rotating speed and the guide vane opening degree in the operating range through a manual input module according to the actual operating environment of the variable-speed pumped storage unit without an online real-time solving process, so that the standby function can be borne during automatic combined failure, and the user preference and flexibility requirements of the operator can be met;
manual combination and automatic combination switching of the software part of the combined regulation and control system are realized by the operation of a user on a manual input module;
and if the working condition state obtained from the communication of the monitoring device is inconsistent with the working condition state acquired by the joint regulation and control system through the switching value input module, the display module displays the fault that the working condition state does not correspond to and stops running.
The optimal operation curved surface or the combined operation table of the variable-speed pumped storage unit required by automatic combination in the controller describes the corresponding relation among the working water head, the power of the variable-speed pumped storage unit, the optimal guide vane opening and the optimal mechanical rotation speed, the dynamic characteristic physical model experiment table obtains the optimal combined operation table of the unit by adopting a method based on a BP neural network and a variable speed evolution law, and in addition, the optimal efficiency tracking strategy and the model experiment methods of different operation working condition points can also be adopted to obtain the optimal combined operation table, and the optimal combined operation table can also be obtained by other new methods or improved methods.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A combined regulation and control system of a speed regulator and a current transformer for a stepless speed change pumped storage power station, wherein the stepless speed change pumped storage power station comprises a variable speed pumped storage unit, a speed regulator device, a current transformer device, a combined regulation and control system and a monitoring device, and is characterized in that: the combined regulation and control system comprises a hardware part and a software part, wherein the hardware part comprises a controller, a communication module, an analog input module, a switching value input module, a manual input module and a display module, and the software part comprises an automatic combination module and a manual combination module;
the controller is used for controlling the stepless speed change pumped storage power station and solving to obtain an optimal guide vane opening signal and an optimal mechanical rotating speed signal;
the analog input module comprises a power transmitter, a pressure sensor and a signal conditioning circuit, wherein the signal conditioning circuit processes a signal acquired by the pressure sensor to enable the signal to meet the signal requirement of the analog input module;
the switching value input module is used for judging the operation working conditions of the variable-speed pumped storage unit, and the operation working conditions of the variable-speed pumped storage unit comprise a pumping working condition and a power generation working condition;
the manual input module is used for an operator to manually input parameters;
the display module is used for displaying the information of the stepless speed change pumped storage power station;
the communication module is used for communicating the control module with the speed regulator device, the current transformer device, the monitoring device, the manual input module and the display module;
the automatic combination module and the manual combination module are arranged in the controller, the stepless speed change pumped storage power station is automatically controlled through the automatic combination module, and an operator manually controls the stepless speed change pumped storage power station through the manual combination module.
2. The combined governor and converter regulation system for a continuously variable pumped-hydro power plant of claim 1, wherein: the combined regulation and control system comprises a remote mode and a local mode, the remote mode is used for receiving an operation command sent by the monitoring device remotely and used as an input command of the combined regulation and control system, the display module displays the operation command sent by the monitoring device remotely, the local mode inputs the operation command through the manual input module, the display module displays the operation command input by the manual input module, and the operation command comprises a pumping mode, a power generation mode and an active setting signal of the variable-speed pumped storage unit.
3. The combined governor and converter regulation system for a continuously variable pumped-hydro power plant of claim 1, wherein: the controller is a PLC.
4. The combined governor and converter regulation system for a continuously variable pumped-hydro power plant of claim 1, wherein: and when the working condition state obtained by the communication of the monitoring device is inconsistent with the working condition state acquired by the combined regulation and control system through the switching value input module, the display module displays that the working condition state does not correspond to the fault and stops running.
5. A combined regulation and control method of speed governor and converter for infinitely variable speed pumped-storage power station, using the combined regulation and control system for infinitely variable speed pumped-storage power station of any of claims 1 to 4, comprising:
the method comprises the steps that firstly, a first combined operation table and a second combined operation table are formed in advance, the first combined operation table comprises variable-speed pumped storage unit power, a working water head and an optimal mechanical rotating speed, and the second combined operation table comprises variable-speed pumped storage unit power, a working water head and an optimal guide vane opening degree;
secondly, the controller obtains a variable-speed pumped storage unit power setting signal and a working condition instruction signal from the monitoring device;
and step three, the controller obtains an optimal guide vane opening signal and an optimal mechanical rotating speed signal through real-time solution, transmits the optimal guide vane opening signal to the speed regulator device, and transmits the optimal mechanical rotating speed signal to the converter device.
6. The method of claim 5 wherein the step of combining the governor and converter for a continuously variable pumped-hydro power plant comprises the steps of: the method for solving the optimal mechanical rotating speed by the controller comprises the following steps:
step S101, dividing an interpolation grid, and dividing a plane of the variable-speed pumped storage unit power P-working head H into a plurality of equidistant grids;
step S102, according to the first combined operation table, obtaining input values S corresponding to four vertexes of each square1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And a mechanical speed n1、n2、n3And n4；
Step S103, according to the input values S of four vertexes of each square1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And an output value n1、n2、n3And n4Obtaining interpolation coefficients a, b, c and d of each square:
obtaining interpolation coefficients of all the squares according to the mechanical rotating speed;
step S104, acquiring a current working water head signal, an active setting signal of the variable-speed pumped storage unit obtained by communicating with the monitoring device or an active setting signal of the variable-speed pumped storage unit input by a manual input module to obtain an input value S (p, h), positioning to a corresponding grid, taking out four interpolation coefficients of the grid, and obtaining an optimal mechanical rotating speed n according to the following formula:
n＝a+bp1+ch1+dp1h1
if the input value happens to fall on the top of the square, the square at the lower left corner of the input value is selected as the corresponding square.
7. The method of claim 5 wherein the step of combining the governor and converter for a continuously variable pumped-hydro power plant comprises the steps of: the method for solving the optimal guide vane opening degree by the control module comprises the following steps:
step S201, dividing an interpolation grid, and dividing a plane of the variable-speed pumped storage unit power P-working head H into a plurality of equidistant grids;
step S202, according to the second combined operation table, obtaining input values S corresponding to four vertexes of each square1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And opening y of guide vane1、y2、y3And y4；
Step S203, according to the input values S of four vertexes of each square1(p1,h1)、S2(p2,h2)、S3(p3,h3) And S4(p4,h4) And the output value y1、y2、y3And y4Obtaining interpolation coefficients e, f, l and m of each square:
obtaining interpolation coefficients of all the squares according to the opening degree of the guide vanes;
step S204, acquiring a current working water head signal, an active setting signal of the variable-speed pumped storage unit obtained by communicating with the monitoring device or an active setting signal of the variable-speed pumped storage unit input by a manual input module to obtain an input value S (p, h), positioning to a corresponding grid, taking out four interpolation coefficients of the grid, and obtaining an optimal guide vane opening y according to the following formula:
y＝e+fp+lh+mph
if the input value happens to fall on the top of the square, the square at the lower left corner of the input value is selected as the corresponding square.
8. The method of combined regulation of governors and converters for infinitely variable speed pumped-storage power plants according to any of claims 6 or 7, wherein: the range of the working water head H is 23-33 m, and the range of the power P of the variable-speed pumped storage unit is 30-80 kW.
9. The method of claim 5 wherein the step of combining the governor and converter for a continuously variable pumped-hydro power plant comprises the steps of: and the optimal guide vane opening value and the optimal mechanical rotating speed value obtained by tracking the actual guide vane opening and the actual mechanical rotating speed of the variable-speed pumped storage unit realize automatic combination.
10. The method of claim 5 wherein the step of combining the governor and converter for a continuously variable pumped-hydro power plant comprises the steps of: the dynamic characteristic experiment table of the variable-speed pumped storage unit obtains a first combined operation table and a second combined operation table by adopting a method based on a BP neural network and a variable-speed evolution rule.
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