A flexible control method and device for variable speed pumping and storage unit considering counter-regulation inhibition

Abstract

The application discloses a flexible control method and device of variable-speed pumped storage unit considering anti-regulation inhibition, and relates to the technical field of power system frequency stability control, and the method comprises the following steps: a combined model of full-power variable-speed pumped storage unit is established, and the operation parameters of the full-power variable-speed pumped storage unit are sampled and substituted; a DC voltage deviation feedback quantity is obtained based on a DC capacitor virtual inertia strategy; a DC voltage deviation feedback link is introduced into an active power control loop of a machine-side converter of the combined model, power grid frequency fluctuation is coupled to a machine-side power instruction to drive the rotor of the unit to release kinetic energy, and a transient virtual damping link based on the change rate of guide vane opening is set to generate a power compensation quantity; the DC voltage deviation feedback quantity, the power compensation quantity and the original machine-side active power instruction are superposed to form a reference power of machine-side cooperative active support; and flexible cooperative support of DC side capacitor energy storage and rotor kinetic energy is realized, and power anti-regulation caused by water hammer effect is effectively inhibited.

Description

Technical Field

[0001] This invention relates to the field of power system frequency stability control technology, and more specifically, to a flexible control method and device for variable speed pumped-storage units that takes into account the suppression of reverse regulation. Background Technology

[0002] In recent years, the proportion of renewable energy sources such as wind power and photovoltaic power has increased significantly. The randomness, intermittency and volatility of their output have brought severe challenges to the stable operation of new power systems. Full-power variable speed pumped storage units have become a key resource for flexible regulation due to their advantages of wide speed adjustment range, high overcurrent capacity and complete decoupling between speed and grid frequency. However, this structure means that the rotor kinetic energy and DC capacitor energy storage of the unit cannot actively respond to changes in grid frequency, and additional control is required to provide inertial support for the system.

[0003] Existing research on inertia support is mostly focused on wind power and photovoltaics. The former often utilizes rotor kinetic energy or reserved backup power, and provides inertial support by introducing the rate of change of frequency as a feedback signal. The latter relies on load shedding or DC-side capacitor energy storage to participate in grid frequency regulation. The above research has laid a theoretical foundation for designing virtual inertia strategies for full-power variable speed pumped storage units. However, the inherent water hammer effect on the hydraulic side of the unit is a significant feature that distinguishes it from wind power and photovoltaics. The water hammer effect is caused by the inertia of water flow, and the dynamic process can be described by a first-order non-minimum phase transfer function. When the governor guide vane opening is rapidly adjusted, the mechanical power exhibits the characteristic of first adjusting in the opposite direction and then in the same direction, which directly affects the stable operation and inertial support capability of the unit.

[0004] Therefore, this application is hereby submitted. Summary of the Invention

[0005] The purpose of this invention is to provide a flexible control method and device for variable speed pumped storage units that takes into account the suppression of reverse regulation. Based on the virtual inertial control of DC capacitor, this method further introduces virtual inertial control of rotor kinetic energy that takes into account the water hammer effect in the power loop on the generator side, thereby realizing flexible coordinated support of DC capacitor energy storage and rotor kinetic energy, and effectively suppressing the power reverse regulation caused by the water hammer effect.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] In a first aspect, this application provides a flexible control method for variable-speed pumped-storage units that takes into account reverse regulation suppression, comprising the following specific steps:

[0008] A combined model of a full-power variable-speed pumped storage unit was established. The combined model includes a pump-turbine and its speed control system, a synchronous generator motor, a generator-side converter, and a grid-side converter. The generator-side converter adopts a fast power control mode, and the grid-side converter adopts DC voltage outer loop and grid current inner loop control.

[0009] The operating parameters of the full-power variable-speed pumped storage unit were sampled and substituted into the combined model. The operating parameters include the electromagnetic power of the synchronous machine, the motor speed, the DC side voltage, the voltage and current of the grid-side converter, and the grid frequency.

[0010] In the grid-side converter of the combined model, based on the DC capacitor virtual inertia strategy, a coupling relationship between the DC capacitor voltage reference value and the grid frequency deviation is established to obtain the DC voltage deviation feedback quantity.

[0011] In the active power control loop of the generator-side converter in the combined model, a DC voltage deviation feedback loop is introduced to couple grid frequency fluctuations to generator-side power commands to drive the generator rotor to release kinetic energy. A transient virtual damping loop based on the guide vane opening change rate is also set to generate power compensation.

[0012] The DC voltage deviation feedback and power compensation are superimposed with the original active power command on the machine side to form the reference power for machine-side collaborative active support.

[0013] Based on the above technical solution, the present invention can be further improved as follows.

[0014] Furthermore, the aforementioned establishment of the coupling relationship between the DC capacitor voltage reference value and the grid frequency deviation is specifically as follows: ; In the formula, This refers to the DC capacitor voltage deviation. The virtual inertial time constant of the DC capacitor. This is the rated value of the DC capacitor voltage. This is the rated value of the network-side frequency. It is a DC capacitor. This is the initial value of the DC capacitor voltage. This indicates the frequency deviation of the power grid.

[0015] Furthermore, the aforementioned DC voltage deviation feedback amount is specifically as follows: ; In the formula, This is the DC voltage deviation feedback quantity. Indicates the kinetic energy support coefficient. This indicates the reference value for the DC capacitor voltage. This represents the DC capacitor voltage.

[0016] Furthermore, the aforementioned power compensation amount is specifically as follows: ; In the formula, This is the power compensation amount. For transient virtual damping gain, This represents the rate of change in the guide vane opening of the water pump turbine.

[0017] Furthermore, the reference power for the aforementioned machine-side coordinated active support is specifically as follows: ; In the formula, This serves as the reference power for coordinated active support from the machine side. This indicates the active power command value on the original machine side. This indicates the DC voltage deviation feedback quantity. This indicates the amount of power compensation.

[0018] Secondly, this application provides a flexible control device for a variable-speed pumped-storage unit that considers back-adjustment suppression, applied to a flexible control method for a variable-speed pumped-storage unit that considers back-adjustment suppression according to any one of the first aspects, comprising:

[0019] The model building module is used to establish a combined model of a full-power variable speed pumped storage unit. The combined model includes a pump-turbine and its speed control system, a synchronous generator motor, a generator-side converter, and a grid-side converter. The generator-side converter adopts a fast power control mode, and the grid-side converter adopts DC voltage outer loop and grid current inner loop control.

[0020] The operating parameter acquisition module is used to sample the operating parameters of the full-power variable speed pumped storage unit and substitute the operating parameters into the combined model; the operating parameters include synchronous machine electromagnetic power, motor speed, DC side voltage, grid-side converter voltage and current, and grid frequency;

[0021] The first calculation module is used to establish the coupling relationship between the DC capacitor voltage reference value and the grid frequency deviation in the grid-side converter of the combined model based on the DC capacitor virtual inertia strategy, so as to obtain the DC voltage deviation feedback quantity.

[0022] The second calculation module is used to introduce a DC voltage deviation feedback loop into the active power control loop of the generator-side converter in the combined model, couple grid frequency fluctuations to generator-side power commands to drive the generator rotor to release kinetic energy, and set a transient virtual damping loop triggered by the guide vane opening change rate to generate power compensation.

[0023] The reference power acquisition module is used to superimpose the DC voltage deviation feedback, power compensation, and the original active power command on the machine side to form a reference power for machine-side collaborative active support.

[0024] Furthermore, the reference power for the aforementioned machine-side coordinated active support is specifically as follows: ; In the formula, This serves as the reference power for coordinated active support from the machine side. This indicates the active power command value on the original machine side. This indicates the DC voltage deviation feedback quantity. This indicates the amount of power compensation.

[0025] Furthermore, the aforementioned power compensation amount is specifically as follows: ; In the formula, This is the power compensation amount. For transient virtual damping gain, The rate of change of the guide vane opening of the water pump turbine; The DC voltage deviation feedback quantity is as follows: ; In the formula, This is the DC voltage deviation feedback quantity. Indicates the kinetic energy support coefficient. This indicates the reference value for the DC capacitor voltage. This represents the DC capacitor voltage.

[0026] Thirdly, this application provides an electronic device, including: at least one processor, at least one memory, and a data bus;

[0027] In this system, the processor and memory communicate with each other via a data bus; the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute a flexible control method for variable speed pumped storage units that takes into account anti-regulation suppression, as described in any of the first aspects.

[0028] Fourthly, this application provides a non-transitory computer-readable storage medium that stores computer instructions, which cause a computer to execute a flexible control method for a variable-speed pumped-storage unit that takes into account anti-adjustment suppression, as described in any of the first aspects.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] This invention achieves coordinated support of DC-side capacitor energy storage and rotor kinetic energy by introducing DC capacitor virtual inertial control on the grid side and DC voltage deviation feedback and transient virtual damping on the turbine side. This method can effectively suppress frequency deviation peaks, reduce power back-regulation amplitude, weaken the influence of water hammer effect, enhance system stability, and achieve optimized coordination between unit support effect and mechanical-hydraulic safety boundary. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0032] Figure 1 This is a control block diagram of a full-power variable-speed pumped storage unit in an embodiment of the present invention;

[0033] Figure 2 This is a control block diagram of a unit considering a cooperative active support strategy for hydraulic back-regulation suppression in an embodiment of the present invention;

[0034] Figure 3 This is a topology diagram of the unit's electromagnetic transient simulation in an embodiment of the present invention;

[0035] Figure 4 The waveform diagrams are for virtual control without additional control and based solely on DC capacitors in this embodiment of the invention.

[0036] Figure 5 This is a waveform diagram showing the change in rotor kinetic energy coefficient K1 in an embodiment of the present invention;

[0037] Figure 6 This is a waveform diagram showing the change in transient virtual damping gain K2 in an embodiment of the present invention;

[0038] Figure 7 This is a flowchart of the control method in an embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of the embodiments of the present invention, "multiple" means at least two.

[0043] Example 1: This example provides a flexible control method for variable speed pumped-storage units that takes into account reverse regulation suppression, including the following specific steps:

[0044] S1. Establish a combined model of the full-power variable speed pumped storage unit. The combined model includes the pump turbine and its speed control system, synchronous generator motor, generator-side converter and grid-side converter. The generator-side converter adopts a fast power control mode, and the grid-side converter adopts DC voltage outer loop and grid current inner loop control.

[0045] S2, sample the operating parameters of the full-power variable speed pumped storage unit and substitute the operating parameters into the combined model; the operating parameters include the electromagnetic power of the synchronous machine, the motor speed, the DC side voltage, the voltage and current of the grid-side converter, and the grid frequency.

[0046] S3. In the grid-side converter of the combined model, based on the DC capacitor virtual inertia strategy, a coupling relationship between the DC capacitor voltage reference value and the grid frequency deviation is established to obtain the DC voltage deviation feedback quantity.

[0047] S4. In the active power control loop of the generator-side converter in the combined model, a DC voltage deviation feedback loop is introduced to couple grid frequency fluctuations to generator-side power commands to drive the generator rotor to release kinetic energy. A transient virtual damping loop based on the guide vane opening change rate is set to generate power compensation.

[0048] S5 superimposes the DC voltage deviation feedback, power compensation, and the original active power command on the machine side to form a reference power for machine-side collaborative active support.

[0049] In step S1 above, it can be done according to Figure 1 The control block diagram shown establishes a full-power variable-speed pumped storage unit model, in which the generator-side converter adopts a fast power operating mode, and the grid-side converter adopts voltage and current dual-loop control.

[0050] Among them, U k I k P k Q k (k=s, g) represent the voltage, current, active power, and reactive power of the converter on the generator side and grid side, respectively. The subscript s represents the generator-side variable, and the subscript g represents the grid-side variable; U dcref with U dc For the DC capacitor voltage reference command and actual value; P sref n ref These are the machine-side active power command value and the motor speed command value, respectively.

[0051] In step S2 above, the voltage and current outputs of the two converters and the DC capacitor voltage can be sampled using voltage and current sensors to extract the synchronous motor electromagnetic power P.e Mechanical power P m Motor speed n and power grid frequency f.

[0052] In step S3 above, when fluctuations in new energy output cause a power deficit in the system, the full-power variable-speed pumped storage unit needs to provide rapid power support to the system. To enable the energy stored in the DC capacitor to respond to system frequency fluctuations, a DC capacitor virtual inertia method is proposed based on a current-source type virtual inertia strategy.

[0053] In a full-power pumped-storage unit, neglecting converter power losses, by simultaneously establishing the expression for the virtual inertia of the current source type and the DC capacitor power deviation equation, and then normalizing them, we can obtain: ; Integrating both sides simultaneously yields: ; By analogy with the inertial response equation of a synchronous machine, we can obtain K and H. dc The relationship between H dc =Kf N / 2, therefore, the DC voltage outer loop command considering the DC capacitor virtual inertia strategy is: ; In the above formula, This refers to the DC capacitor voltage deviation. The virtual inertial time constant of the DC capacitor. This is the rated value of the DC capacitor voltage. This is the rated value of the network-side frequency. It is a DC capacitor. This is the initial value of the DC capacitor voltage. This indicates the frequency deviation of the power grid.

[0054] In step S4 above, in order to obtain rotational kinetic energy while suppressing water hammer, a transient virtual damping element P is added to the machine-side control command. damp And introduce a DC voltage deviation term ΔP k : ; The final collaborative active support reference power value for the machine-side converter is: ; In the formula, This is the DC voltage deviation feedback quantity. Indicates the kinetic energy support coefficient. This indicates the reference value for the DC capacitor voltage. Indicates the DC capacitor voltage. This is the power compensation amount. For transient virtual damping gain, This represents the rate of change in the guide vane opening of the water pump turbine.

[0055] The method of the present invention will be further illustrated by the following examples.

[0056] Simulation verification was conducted using a 5MW full-power variable speed pumped storage unit as an example, according to... Figure 2 The control block diagram shown controls each module. A system like this is built in PSCAD / EMTDC. Figure 3 The electromagnetic transient simulation model of the unit shown is given, where P psu P sg P load These represent the active power output from the grid-side converter, the active power output from the AC-side synchronous generator, and the active power absorbed by the load. The main parameters of the model are: switching frequency 5kHz, rated capacity 5MW, effective terminal voltage 3.3kV, synchronous machine inertia time constant 6.4s, DC capacitor 0.1F, and filter inductance 0.06mH. The system initially operates under rated generating conditions. At t=45s, a sudden load increase of 0.02pu triggers a frequency step drop disturbance.

[0057] Figure 4 The figures show the waveforms of grid-side frequency, DC voltage, grid-side active power, and machine-side mechanical work with and without additional control, only with additional control based on DC capacitor virtual inertia control. When the frequency drops at 45s, due to the complete decoupling effect of the full-power converter, the machine-side mechanical power P... m Almost no response occurs, DC voltage U dc Maintaining a constant frequency, the grid frequency drops significantly and exhibits noticeable oscillations. After introducing virtual inertial control of the grid-side DC capacitor, the DC capacitor rapidly releases energy in response to the frequency drop, and the grid-side power P... g A sudden positive increase is generated to support the grid frequency, effectively raising the lowest point of the grid frequency drop and significantly reducing transient oscillations. However, at this time, due to capacitor discharge, the DC voltage U... dc A significant drop occurred; simultaneously, due to the opening of the governor guide vanes, the mechanical power P... m A clear water hammer effect was observed.

[0058] Figure 5 This represents the system response as the rotor kinetic energy inertia support coefficient K1 gradually increases. As K1 increases, the machine-side converter couples the rotor kinetic energy more strongly to the DC bus. DC voltage U dc The drop depth was significantly reduced, and the lowest frequency point was further raised, resulting in a more stable system frequency. As K1 increases, the grid-side active power P... g The peak power of the motor gradually increases, providing more ample power support. However, due to the extraction of rotor kinetic energy, the decrease in motor speed triggers the speed governor to operate more violently, resulting in a decrease in the mechanical power P on the machine side.m The transient water hammer counter-damping depth also increases, indicating that simply increasing the kinetic energy support will exacerbate the water hammer counter-damping.

[0059] To suppress water hammer back-adjustment caused by rotor support Figure 6 The system response is given by changing the transient virtual damping gain K2 while keeping K1=7. As K2 increases, the mechanical power P... m The trough value of the drop was gradually raised, and the transient virtual damping element based on the guide vane opening change rate effectively suppressed the power reversal caused by the water hammer effect. With the optimized adjustment of K2, not only was the mechanical power reversal effectively suppressed, but the DC voltage U dc Transient drops and grid-side active power P g The fluctuations were further smoothed out, while the grid frequency f maintained a good supporting effect.

[0060] In summary, the flexible collaborative active support control strategy proposed in this invention achieves collaborative support between the DC capacitor and rotor kinetic energy through the K1 stage, thereby improving frequency stability. Through the K2 transient virtual damping stage, it effectively overcomes the inherent water hammer problem during frequency regulation in full-power pumped-storage units, achieving coordinated operation between the external active support effect and the internal mechanical-hydraulic safety boundary of the unit.

[0061] Example 2: This application provides a flexible control device for a variable-speed pumped-storage unit that considers back-adjustment suppression, applied to a flexible control method for a variable-speed pumped-storage unit that considers back-adjustment suppression as described in Example 1, including:

[0062] The model building module is used to establish a combined model of a full-power variable speed pumped storage unit. The combined model includes a pump-turbine and its speed control system, a synchronous generator motor, a generator-side converter, and a grid-side converter. The generator-side converter adopts a fast power control mode, and the grid-side converter adopts DC voltage outer loop and grid current inner loop control.

[0063] The operating parameter acquisition module is used to sample the operating parameters of the full-power variable speed pumped storage unit and substitute the operating parameters into the combined model; the operating parameters include synchronous machine electromagnetic power, motor speed, DC side voltage, grid-side converter voltage and current, and grid frequency;

[0064] The first calculation module is used to establish the coupling relationship between the DC capacitor voltage reference value and the grid frequency deviation in the grid-side converter of the combined model based on the DC capacitor virtual inertia strategy, so as to obtain the DC voltage deviation feedback quantity.

[0065] The second calculation module is used to introduce a DC voltage deviation feedback loop into the active power control loop of the generator-side converter in the combined model, couple grid frequency fluctuations to generator-side power commands to drive the generator rotor to release kinetic energy, and set a transient virtual damping loop triggered by the guide vane opening change rate to generate power compensation.

[0066] The reference power acquisition module is used to superimpose the DC voltage deviation feedback, power compensation, and the original active power command on the machine side to form a reference power for machine-side collaborative active support.

[0067] Optionally, the reference power for the aforementioned machine-side coordinated active support is specifically as follows: ; In the formula, This serves as the reference power for coordinated active support from the machine side. This indicates the active power command value on the original machine side. This indicates the DC voltage deviation feedback quantity. This indicates the amount of power compensation.

[0068] Optionally, the above power compensation amount is specifically as follows: ; In the formula, This is the power compensation amount. For transient virtual damping gain, The rate of change of the guide vane opening of the water pump turbine; The DC voltage deviation feedback quantity is as follows: ; In the formula, This is the DC voltage deviation feedback quantity. Indicates the kinetic energy support coefficient. This indicates the reference value for the DC capacitor voltage. This represents the DC capacitor voltage.

[0069] Example 3: This application provides an electronic device, including: at least one processor, at least one memory, and a data bus;

[0070] In this system, the processor and the memory communicate with each other via a data bus; the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute a flexible control method for a variable speed pumped storage unit that takes into account the suppression of reverse regulation, as described in Example 1.

[0071] Example 4: This application provides a non-transitory computer-readable storage medium that stores computer instructions, which cause the computer to execute a flexible control method for a variable-speed pumped-storage unit that takes into account the suppression of reverse regulation, as described in Example 1.

[0072] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0073] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0074] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0075] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0076] Those skilled in the art will understand that all or part of the steps in the above facts and methods can be implemented by a program instructing related hardware. The program or the program described therein can be stored in a computer-readable storage medium. When the program is executed, it includes the following steps: at this time, the corresponding method steps are introduced. The storage medium can be ROM / RAM, magnetic disk, optical disk, etc.

[0077] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flexible control method for a variable-speed pumped-storage unit considering reverse regulation suppression, characterized in that, The specific steps include the following: A combined model of a full-power variable-speed pumped storage unit was established. The combined model includes a pump-turbine and its speed control system, a synchronous generator motor, a generator-side converter, and a grid-side converter. The generator-side converter adopts a fast power control mode, and the grid-side converter adopts DC voltage outer loop and grid current inner loop control. The operating parameters of the full-power variable-speed pumped storage unit are sampled and substituted into the combined model; the operating parameters include the synchronous machine electromagnetic power, motor speed, DC side voltage, grid-side converter voltage and current, and grid frequency; In the grid-side converter of the combined model, a coupling relationship between the DC capacitor voltage reference value and the grid frequency deviation is established based on the DC capacitor virtual inertia strategy to obtain the DC voltage deviation feedback quantity. In the active power control loop of the generator-side converter in the combined model, a DC voltage deviation feedback loop is introduced to couple grid frequency fluctuations to generator-side power commands to drive the generator rotor to release kinetic energy, and a transient virtual damping loop triggered by the guide vane opening change rate is set to generate power compensation. The DC voltage deviation feedback, the power compensation, and the original active power command on the machine side are superimposed to form the reference power for machine-side collaborative active support.

2. The flexible control method for a variable-speed pumped-storage unit considering reverse regulation suppression according to claim 1, characterized in that, The establishment of the coupling relationship between the DC capacitor voltage reference value and the grid frequency deviation is specifically as follows: ； In the formula, This refers to the DC capacitor voltage deviation. The virtual inertia time constant of the DC capacitor. This is the rated value of the DC capacitor voltage. This is the rated value of the network-side frequency. It is a DC capacitor. This is the initial value of the DC capacitor voltage. This indicates the frequency deviation of the power grid.

3. The flexible control method for a variable-speed pumped-storage unit considering reverse regulation suppression according to claim 1, characterized in that, The DC voltage deviation feedback amount is specifically: ； In the formula, This is the DC voltage deviation feedback quantity. Indicates the kinetic energy support coefficient. This indicates the reference value for the DC capacitor voltage. This represents the DC capacitor voltage.

4. The flexible control method for a variable-speed pumped-storage unit considering reverse regulation suppression according to claim 1, characterized in that, The power compensation amount is specifically as follows: ； In the formula, This is the power compensation amount. For transient virtual damping gain, This represents the rate of change in the guide vane opening of the water pump turbine.

5. The flexible control method for a variable-speed pumped-storage unit considering reverse regulation suppression according to claim 1, characterized in that, The reference power for the machine-side collaborative active support is specifically: ； In the formula, This serves as the reference power for coordinated active support from the machine side. This indicates the active power command value on the original machine side. This indicates the DC voltage deviation feedback quantity. This indicates the amount of power compensation.

6. A flexible control device for a variable-speed pumped-storage unit that considers reverse regulation suppression, characterized in that, include: The model building module is used to establish a combined model of a full-power variable speed pumped storage unit. The combined model includes a pump-turbine and its speed control system, a synchronous generator motor, a generator-side converter, and a grid-side converter. The generator-side converter adopts a fast power control mode, and the grid-side converter adopts DC voltage outer loop and grid current inner loop control. The operating parameter acquisition module is used to sample the operating parameters of the full-power variable speed pumped storage unit and substitute the operating parameters into the combined model; the operating parameters include synchronous machine electromagnetic power, motor speed, DC side voltage, grid-side converter voltage and current, and grid frequency; The first calculation module is used to establish a coupling relationship between the DC capacitor voltage reference value and the grid frequency deviation in the grid-side converter of the combined model based on the DC capacitor virtual inertia strategy, so as to obtain the DC voltage deviation feedback quantity. The second calculation module is used to introduce a DC voltage deviation feedback loop into the active power control loop of the generator-side converter in the combined model, couple grid frequency fluctuations to generator-side power commands to drive the generator rotor to release kinetic energy, and set a transient virtual damping loop triggered by the guide vane opening change rate to generate power compensation. The reference power acquisition module is used to superimpose the DC voltage deviation feedback, the power compensation, and the original active power command on the machine side to form a reference power for machine-side collaborative active support.

7. A flexible control device for a variable-speed pumped-storage unit considering reverse regulation suppression according to claim 6, characterized in that, The reference power for the machine-side collaborative active support is specifically: ； In the formula, This serves as the reference power for coordinated active support from the machine side. This indicates the active power command value on the original machine side. This indicates the DC voltage deviation feedback quantity. This indicates the amount of power compensation.

8. A flexible control device for a variable-speed pumped-storage unit considering reverse regulation suppression according to claim 7, characterized in that, The power compensation amount is specifically as follows: ； In the formula, This is the power compensation amount. For transient virtual damping gain, The rate of change of the guide vane opening of the water pump turbine; The DC voltage deviation feedback amount is specifically: ； In the formula, This is the DC voltage deviation feedback quantity. Indicates the kinetic energy support coefficient. This indicates the reference value for the DC capacitor voltage. This represents the DC capacitor voltage.

9. An electronic device, characterized in that, include: At least one processor, at least one memory, and a data bus; The processor and the memory communicate with each other via the data bus. The memory stores program instructions that can be executed by the processor, which invokes the program instructions to execute a flexible control method for a variable-speed pumped-storage unit that takes into account anti-regulation suppression as described in any one of claims 1-6.

10. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions that cause the computer to execute any one of claims 1-6 of a flexible control method for a variable-speed pumped-storage unit that takes into account anti-regulation suppression.

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