Power control method for pumping condition of double-fed variable pumping and storage unit

Abstract

The disclosure provides a double-fed variable pumping and storage unit pumping condition power control method and a double-fed variable pumping and storage unit. The control method comprises: obtaining a unit power set value, an actual unit power and a speed set value output by a feedback controller in the double-fed variable pumping and storage unit pumping condition; determining a speed regulation state of the double-fed variable pumping and storage unit according to the speed set value, the unit power set value and the actual unit power, wherein the speed regulation state comprises entering a speed regulation dead zone or not entering the speed regulation dead zone; determining a final speed value according to the speed regulation state of the double-fed variable pumping and storage unit, a rated speed of the unit and / or the speed set value; and sending the final speed value to an alternating current excitation control system, wherein the alternating current excitation control system is used for controlling the water pump to rotate based on the final speed value. The control method provided by the disclosure can avoid low-frequency oscillation accidents caused by the unit speed regulation dead zone.

Description

Technical Field

[0001] This disclosure belongs to the field of pumped storage technology, specifically relating to a method for controlling the power of a doubly-fed variable pumped storage unit in pumping operation, as well as the doubly-fed variable pumped storage unit, electronic equipment, computer-readable storage medium, and computer program product. Background Technology

[0002] Pumped storage hydroelectric units, as a highly efficient and clean power source, offer advantages such as flexible start-up and shutdown and rapid response. They play a crucial role in supporting the large-scale development and utilization of new energy sources, enhancing the reliable supply capacity of the power system, and ensuring the safety and stability of the power system. Furthermore, they can optimize the power supply structure, achieve green and environmentally friendly practices, and ultimately contribute to overall energy conservation and emission reduction in the power system, thereby improving overall economic efficiency.

[0003] Traditional constant-speed pumped-storage hydroelectric turbines use synchronous motors, with the turbine speed matching the grid frequency. Therefore, the turbine can only operate at a constant synchronous speed. In this case, the constant-speed turbine cannot adapt to large head variations, and excessive water hammer in the hydraulic system can easily trigger ultra-low frequency oscillations in the grid. Because the power regulation of constant-speed turbines is a mechanical process, the regulation speed is slow, resulting in poor performance in regulating wind power output, which is highly random and volatile.

[0004] With technological advancements, new variable-speed pumped storage units have achieved decoupling between unit speed and system frequency, exhibiting superior regulation performance compared to traditional constant-speed pumped storage units during grid frequency and power regulation. Variable-speed pumped storage units utilize doubly-fed motors or full-power converters, featuring variable-speed constant-frequency operation characteristics. This broadens the operating range of the pump-turbine system while enabling rapid active power regulation. Compared to traditional pumped storage units, variable-speed pumped storage units offer advantages and application value including variable-speed constant-frequency operation and rapid active and reactive power regulation; improved unit operating conditions, increased operating efficiency and adaptability to head; enhanced power system transient stability, mitigating system frequency oscillations caused by fluctuations in renewable energy output; more stable start-up and grid connection in pump mode; and the ability to regulate system frequency during pumping.

[0005] Currently, several variable speed pumped storage units have been built in some regions, but the application of doubly-fed variable speed pumped storage units is still in its initial stage, and the problem of the governor crossing the speed dead zone under actual conditions has not been considered. Summary of the Invention

[0006] The present invention aims to at least solve one of the technical problems existing in the prior art, and provides a method for controlling the power of a doubly-fed variable pumped-storage unit in pumping operation, as well as a doubly-fed variable pumped-storage unit, electronic equipment, computer-readable storage medium and computer program product.

[0007] To achieve the above object, in a first aspect, the embodiments of the present disclosure provide a power control method for pumping mode of a doubly-fed variable pumping and storage unit, the method comprising:

[0008] In the pumping mode of the doubly-fed variable pumping and storage unit, a unit power set value, a unit actual power and a speed set value output by a feedback controller are obtained;

[0009] According to the speed set value, the unit power set value and the unit actual power, a speed regulation state of the doubly-fed variable pumping and storage unit is determined, the speed regulation state comprising entering a speed regulation dead zone or not entering the speed regulation dead zone;

[0010] According to the speed regulation state of the doubly-fed variable pumping and storage unit, a unit rated speed and / or the speed set value, a speed final value is determined;

[0011] The speed final value is sent to an alternating current excitation control system, wherein the alternating current excitation control system is configured to control rotation of the water pump based on the speed final value.

[0012] In some embodiments, according to the speed set value, the unit power set value and the unit actual power, the speed regulation state of the doubly-fed variable pumping and storage unit is determined, comprising:

[0013] A difference between the unit power set value and the unit actual power is calculated to obtain a first difference value;

[0014] It is determined whether the speed set value is within a speed regulation dead zone range to obtain a first determination result;

[0015] It is determined whether the first difference value is greater than a preset first value and less than a preset second value to obtain a second determination result;

[0016] Based on the first determination result and the second determination result, the speed regulation state of the doubly-fed variable pumping and storage unit is determined.

[0017] In some embodiments, based on the first determination result and the second determination result, the speed regulation state of the doubly-fed variable pumping and storage unit is determined, comprising:

[0018] The first determination result and the second determination result are subjected to an AND operation to obtain a first output result;

[0019] The first output result is input to a set end of a set-reset flip-flop, and a signal exclusive to the first output result is input to a reset end of the set-reset flip-flop to obtain a flag bit output by the set-reset flip-flop according to the first output result and the signal exclusive to the first output result, a value of the flag bit indicating whether the doubly-fed variable pumping and storage unit enters the speed regulation dead zone.

[0020] In some embodiments, the inputting the signal mutually exclusive with the first output result into the reset end of the set-reset flip-flop specifically comprises:

[0021] determining whether the first difference is greater than or equal to a preset second value and the final value of the rotating speed is greater than the rated rotating speed, to obtain a third determination result;

[0022] determining whether the first difference is less than or equal to an opposite number of a preset first value and the final value of the rotating speed is greater than the rated rotating speed, to obtain a fourth determination result;

[0023] determining whether the first difference is greater than or equal to the preset first value and the final value of the rotating speed is less than the rated rotating speed, to obtain a fifth determination result;

[0024] determining whether the first difference is less than or equal to an opposite number of the preset second value and the final value of the rotating speed is less than the rated rotating speed, to obtain a sixth determination result;

[0025] performing an OR operation on the third determination result, the fourth determination result, the fifth determination result and the sixth determination result, to obtain a signal mutually exclusive with the first output result;

[0026] inputting the signal mutually exclusive with the first output result into the reset end of the set-reset flip-flop.

[0027] In some embodiments, the determining the final value of the rotating speed according to the speed regulation state of the double-fed variable pumping storage unit, the rated rotating speed of the unit and / or the rotating speed setting value comprises:

[0028] when the speed regulation state of the double-fed variable pumping storage unit is entering a speed regulation dead zone, determining whether the rotating speed setting value is greater than the rated rotating speed;

[0029] if the rotating speed setting value is greater than the rated rotating speed, determining the final value of the rotating speed based on an upper limit value of a rotating speed regulation dead zone range of the double-fed variable pumping storage unit;

[0030] if the rotating speed setting value is less than or equal to the rated rotating speed, determining the final value of the rotating speed based on a lower limit value of the rotating speed regulation dead zone range of the double-fed variable pumping storage unit.

[0031] In some embodiments, the determining the final value of the rotating speed according to the speed regulation state of the double-fed variable pumping storage unit, the rated rotating speed of the unit and / or the rotating speed setting value further comprises:

[0032] when the speed regulation state of the double-fed variable pumping storage unit is not entering a speed regulation dead zone, taking the rotating speed setting value as the final value of the rotating speed.

[0033] In some embodiments, the method further comprises:

[0034] when the speed regulation state is entering the speed regulation dead zone, controlling the input of the unit set power input end and the unit actual power input end of the feedback controller to be the unit actual power;

[0035] when the speed regulation state is not in the speed regulation dead zone, controlling the input of the unit set power input end of the feedback controller to be the unit power set value, and the input of the unit actual power input end to be the unit actual power.

[0036] In some embodiments, when the speed regulation state is entering the speed regulation dead zone, the input of the unit set power input end and the unit actual power input end of the feedback controller is controlled to be the unit actual power, comprising:

[0037] when the value of the flag bit indicates that the double-fed variable pumping storage unit enters the speed regulation dead zone, outputting a preset third value;

[0038] determining whether the absolute value of the first difference value is greater than the preset third value, to obtain a seventh determination result;

[0039] if the seventh determination result is no, controlling the input of the unit set power input end and the unit actual power input end of the feedback controller to be the unit actual power;

[0040] wherein the preset third value is greater than the preset first value and the preset second value.

[0041] In some embodiments, when the speed regulation state is not in the speed regulation dead zone, the input of the unit set power input end of the feedback controller is controlled to be the unit power set value, and the input of the unit actual power input end is controlled to be the unit actual power, comprising:

[0042] when the value of the flag bit indicates that the double-fed variable pumping storage unit does not enter the speed regulation dead zone, outputting 0;

[0043] determining whether the absolute value of the first difference value is greater than 0, to obtain an eighth determination result;

[0044] if the eighth determination result is yes, controlling the input of the unit set power input end of the feedback controller to be the unit power set value, and the input of the unit actual power input end to be the unit actual power.

[0045] In a second aspect, the disclosure also provides a double-fed variable pumping storage unit, comprising: a feedback controller configured to calculate a speed set value according to the input value of a unit set power input end and the input value of a unit actual power input end;

[0046] a processor connected with the feedback controller, the processor being configured to determine a speed regulation state of the double-fed variable pumping storage unit according to the speed set value, the unit power set value and the unit actual power when the double-fed variable pumping storage unit is in a pumping mode, the speed regulation state including entering a speed regulation dead zone or not entering the speed regulation dead zone; the processor being further configured to determine a final speed value according to the speed regulation state of the double-fed variable pumping storage unit, a rated speed of the unit and / or the speed set value, and send the final speed value to an alternating current excitation control system;

[0047] the alternating current excitation control system being connected with the processor, the alternating current excitation control system being configured to control rotation of the water pump based on the final speed value;

[0048] a water pump connected with the alternating current excitation control system.

[0049] In some embodiments, the double-fed variable pumping storage unit further comprises a set-reset flip-flop, wherein the processor is specifically configured to perform the following steps:

[0050] calculating a difference between the unit power set value and the unit actual power to obtain a first difference value;

[0051] determining whether the speed set value is within a speed regulation dead zone range to obtain a first determination result;

[0052] determining whether the first difference value is greater than a preset first value and less than a preset second value to obtain a second determination result;

[0053] performing an AND operation on the first determination result and the second determination result to obtain a first output result;

[0054] inputting the first output result into a set end of the set-reset flip-flop, and inputting a signal exclusive to the first output result into a reset end of the set-reset flip-flop;

[0055] the set-reset flip-flop being configured to output a flag bit according to the first output result inputted into the set end and the signal exclusive to the first output result inputted into the reset end; wherein a value of the flag bit indicates whether the double-fed variable pumping storage unit enters the speed regulation dead zone.

[0056] In a third aspect, the disclosure further provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the computing method of the first aspect when executing the program.

[0057] In a fourth aspect, the present disclosure further provides a computer readable storage medium storing a computer program for executing the computing method of the first aspect.

[0058] In a fifth aspect, the present disclosure further provides a computer program product comprising computer programs / instructions for implementing the steps of the computing method of the first aspect when executed by a processor.

[0059] The present disclosure combines the theoretical speed value with the actual power value by using the speed setting value, the unit power setting value and the actual unit power, to determine the speed regulation state of the double-fed variable pumped storage unit, so that the speed regulation state of the double-fed variable pumped storage unit can be determined more accurately. Furthermore, different final speed values are determined for different speed regulation states of the double-fed variable pumped storage unit, so that the stability and safety of the power regulation of the variable speed unit in the pumped storage working condition can be improved, and low-frequency oscillation accidents caused by the speed regulation dead zone of the unit can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0060] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure or the prior art, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0061] Figure 1 A schematic diagram of a power control method of a variable speed pumped storage unit in a pumped storage working condition in the prior art;

[0062] Figure 2 A flowchart of a power control method of a double-fed variable pumped storage unit in a pumped storage working condition according to an embodiment of the present disclosure;

[0063] Figure 3 A schematic diagram of a power control method of a variable speed pumped storage unit in a pumped storage working condition according to an embodiment of the present disclosure;

[0064] Figure 4 A logic judgment schematic diagram of an SR flip-flop output flag according to an embodiment of the present disclosure;

[0065] Figure 5 A control logic schematic diagram of step S16 according to an embodiment of the present disclosure;

[0066] Figure 6 A structural block diagram of a double-fed variable pumped storage unit according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0067] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail and completely below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0068] Figure 1 This is a schematic diagram of a power control method for a variable-speed pumped-storage unit under pumping conditions in the prior art. Wherein, as... Figure 1 As shown, a doubly-fed variable pumped-storage unit includes a feedback controller 10, an AC excitation control system 20 connected to the feedback controller 10, and a water pump 30 connected to the AC excitation control system 20. In the prior art, the power control process of a doubly-fed variable pumped-storage unit during pumping operation is as follows: the setpoint input terminal SP of the feedback controller (hereinafter referred to as the PID controller) 10 receives the setpoint power value of the unit, and the actual power input terminal PV of the PID controller 10 receives the actual power of the unit. Based on the received setpoint power value and actual power, the PID controller 10 calculates the speed setpoint and sends this speed setpoint to the AC excitation control system 20. The AC excitation control system 20 uses this speed setpoint as the actual speed to control the rotation of the water pump 30, and simultaneously, the rotation of the water pump 30 outputs the actual power of the unit, feeding it back to the PID controller 10.

[0069] However, under pumping conditions, the unit speed range of a doubly-fed variable speed pumped-storage unit is 93%N-106%N, where N is the rated speed. Due to the inherent characteristics of the doubly-fed variable speed pumped-storage unit, the unit speed cannot operate within the range of 99.8%N-100.2%N; this range is called the speed regulation dead zone. When the power setpoint is within the power range corresponding to the speed regulation dead zone (the power range varies depending on the water head), because the actual unit speed cannot operate within this range, the speed will repeatedly cross the dead zone, leading to fluctuations in unit load regulation and even low-frequency power oscillations.

[0070] Based on the aforementioned problems in the existing technology, this disclosure proposes a power control scheme for doubly-fed variable pumped-storage units during pumping operation. The scheme addresses the control method for when the speed passes through the adjustment dead zone during power regulation of the doubly-fed variable pumped-storage unit during pumping operation. This includes determining whether the speed has entered the dead zone, the control method and logical sequence after entering the dead zone, and the logical judgment of the speed regulation system exiting the dead zone. This improves the stability and safety of power regulation during pumping operation of the doubly-fed variable pumped-storage unit and avoids low-frequency oscillation accidents caused by the unit's speed dead zone.

[0071] In a first aspect, the embodiments of the present disclosure provide a power control method for a pumped storage unit in a pumping mode.

[0072] Figure 2 A flowchart of a power control method for a pumped storage unit in a pumping mode is provided in the embodiments of the present disclosure. The pumped storage unit comprises a feedback controller 10, an AC excitation control system 20 connected to the feedback controller 10, and a water pump 30 connected to the AC excitation control system 20. The control method comprises the following steps:

[0073] In step S11, the set power value of the unit, the actual power of the unit, and the speed set value output by the feedback controller are obtained in the pumping mode of the pumped storage unit.

[0074] Specifically, the set power value of the unit refers to the power value sent by the power grid system to the power plant station. The actual power of the unit refers to the power value corresponding to the actual speed of the water pump in the pumped storage unit. The speed set value refers to the speed value calculated by the feedback controller 10 according to the set power value of the unit and the actual power of the unit. The speed set value can represent the theoretical speed value of the water pump in the pumped storage unit. The feedback controller 10 is generally a PID controller (Proportion Integration Differentiation).

[0075] In step S12, the speed regulation state of the pumped storage unit is determined according to the speed set value, the set power value of the unit, and the actual power of the unit. The speed regulation state includes entering a speed regulation dead zone or not entering the speed regulation dead zone.

[0076] Specifically, in the pumping mode, the speed range of the unit is 93%N-106%N (N is the rated speed). Due to the inherent properties of the pumped storage unit, the speed of the unit cannot be operated in the range of 99.8%N-100.2%N, which is referred to as the speed regulation dead zone range. The speed set value represents the theoretical speed value of the water pump in the pumped storage unit. The embodiments of the present disclosure refer to the theoretical speed value of the unit, and determine the speed regulation state of the pumped storage unit in combination with the set power value of the unit and the actual power of the unit, so that the result is more accurate.

[0077] In step S13, the final speed value is determined according to the speed regulation state of the pumped storage unit, the rated speed of the unit, and / or the speed set value.

[0078] Specifically, since the actual rotating speed of the unit cannot run in the speed regulation dead zone range, otherwise the rotating speed repeatedly crosses the dead zone range, resulting in load regulation fluctuation of the unit, and even low-frequency oscillation phenomenon of power. The speed regulation state of the double-fed variable pumping and storage unit is determined in combination with the embodiment of the disclosure, and the final value of the rotating speed can improve the stability and safety of power regulation of the variable speed unit in pumping condition, and avoid low-frequency oscillation accidents caused by the speed regulation dead zone of the unit.

[0079] In step S14, the final value of the rotating speed is sent to the alternating current excitation control system, wherein the alternating current excitation control system is used to control the water pump rotation based on the final value of the rotating speed.

[0080] The embodiment of the disclosure determines the speed regulation state of the double-fed variable pumping and storage unit by combining the theoretical rotating speed value with the actual power value through the rotating speed setting value, the unit power setting value and the actual power of the unit, which can more accurately determine the speed regulation state of the double-fed variable pumping and storage unit. Further, different final values of the rotating speed are determined for different speed regulation states of the double-fed variable pumping and storage unit, which can improve the stability and safety of power regulation of the variable speed unit in pumping condition, and avoid low-frequency oscillation accidents caused by the speed regulation dead zone of the unit.

[0081] In some embodiments, in step S12, the speed regulation state of the double-fed variable pumping and storage unit is determined according to the rotating speed setting value, the unit power setting value and the actual power of the unit, specifically including: calculating the difference between the unit power setting value and the actual power of the unit to obtain a first difference value; determining whether the rotating speed setting value is in the rotating speed regulation dead zone range to obtain a first determination result; determining whether the first difference value is greater than the opposite number of a preset first value and less than a preset second value to obtain a second determination result; and determining the speed regulation state of the double-fed variable pumping and storage unit based on the first determination result and the second determination result.

[0082] When the first determination result and the second determination result are both yes, it is determined that the speed regulation state of the double-fed variable pumping and storage unit is in the speed regulation dead zone; when at least one of the first determination result and the second determination result is no, it is determined that the speed regulation state of the double-fed variable pumping and storage unit is not in the speed regulation dead zone.

[0083] Specifically, it is assumed that the unit speed setting value is SPn, the unit power setting value is SPp, the unit actual power is PVp, the preset first value is PI, and the preset second value is P2. Since SPn is calculated by the PID controller 10, it has continuity. The preset first value PI and the preset second value P2 are both positive numbers, which can be used to represent the preset condition that the difference between SPp and PVp meets in the process of the normal speed of the double-fed variable pumping storage unit. The preset first value PI and the preset second value P2 are generally determined according to the actual situation of the double-fed variable pumping storage unit in the pumping condition. Alternatively, the preset first value PI and the preset second value P2 can be determined according to the speed regulation dead zone range of the double-fed variable pumping storage unit in the pumping condition. Specifically, the upper limit value and the lower limit value of the speed regulation dead zone range of the double-fed variable pumping storage unit in the pumping condition are used to determine the unit power of the double-fed variable pumping storage unit in the pumping condition corresponding to the upper limit value and the lower limit value, respectively, the second difference of the unit power corresponding to the upper limit value and the lower limit value is calculated, the average value of the second difference divided by two is calculated, and the average value is obtained. The preset first value PI can be a value less than the average value by a preset value, and the preset second value P2 can be a value greater than the average value by a preset value. The preset value is generally not too large and can be 1, 0.5 or can be determined according to the actual situation. For example, it is assumed that the calculated average value is 8 and the preset value is 1, then the preset first value is 7 and the preset second value is 9.

[0084] In the process of the normal speed of the double-fed variable pumping storage unit, the first difference between SPp and PVp generally meets the preset condition, and the value of the first difference is relatively small. Therefore, SPn calculated based on SPp and PVp is generally accurate, so that the double-fed variable pumping storage unit can be determined to enter the speed regulation dead zone based on SPn. If SPn calculated based on SPp and PVp is in the speed regulation dead zone range, it is determined that the double-fed variable pumping storage unit is in the speed regulation dead zone. Otherwise, if SPn calculated based on SPp and PVp is in the speed regulation dead zone range, but the first difference between SPp and PVp is relatively large, SPn calculated based on SPp and PVp will be inaccurate, indicating that the double-fed variable pumping storage unit is not in the speed regulation dead zone at this time.

[0085] Therefore, the idea of entering the speed regulation dead zone in the embodiment of the present disclosure is that when the final calculation value of SPn is in the range of 99.8%N-100.2%N, it is determined that the double-fed variable pumping storage unit enters the speed regulation dead zone. If the current calculation value of SPn is in the range of 99.8%N-100.2%N, but the deviation between the current load setting value and the actual value is large (i.e., the deviation between the unit power setting value and the unit actual power is large), the final SPn will not be in the speed regulation dead zone range.

[0086] Figure 3A schematic diagram of a power control method of a variable-speed pumped storage unit in a pumping operation provided by an embodiment of the present disclosure.

[0087] As shown in Figure 3 In some embodiments, step S13, according to the speed regulation state of the double-fed variable pumped storage unit, the rated speed of the unit and / or the speed set value, determines the final speed value, specifically including the following steps:

[0088] When the speed regulation state of the double-fed variable pumped storage unit is entering the speed regulation dead zone, it is judged whether the speed set value is greater than the rated speed.

[0089] If the speed set value is greater than the rated speed, the final speed value is determined based on the upper limit value of the speed regulation dead zone range of the double-fed variable pumped storage unit.

[0090] If the speed set value is less than or equal to the rated speed, the final speed value is determined based on the lower limit value of the speed regulation dead zone range of the double-fed variable pumped storage unit.

[0091] Specifically, for example, the speed regulation dead zone range of the double-fed variable pumped storage unit is 99.8%N~100.2%N, and N is the rated speed. The double-fed variable pumped storage unit cannot operate in this speed regulation dead zone range, therefore, if the speed set value at this moment is greater than the rated speed, a value that is greater than the upper limit value of the speed regulation dead zone range by a preset range can be taken as the final speed value, for example, 100.21%N, or 100.22%N, and the like, which is slightly greater than the upper limit value of the speed regulation dead zone range; on the contrary, if the speed set value at this moment is less than or equal to the rated speed, a value that is less than the lower limit value of the speed regulation dead zone range by a preset range can be taken as the final speed value, for example, 99.79%N, or 99.78%N, and the like, which is slightly less than the lower limit value of the speed regulation dead zone range, wherein the preset range can be determined according to the actual situation, which is not limited in the present disclosure.

[0092] In the embodiment of the present disclosure, when the double-fed variable pumped storage unit enters the speed regulation dead zone, the final speed value is determined based on the relationship between the speed set value calculated at the current moment and the rated speed, so that the determined final speed value is neither in the speed regulation dead zone range, so that the double-fed variable pumped storage unit can operate normally, nor is the final determined final speed value too far from the actual operating condition.

[0093] In some embodiments, step S13, according to the speed regulation state of the double-fed variable pumped storage unit, the rated speed of the unit and / or the speed set value, determines the final speed value, specifically further including: when the speed regulation state of the double-fed variable pumped storage unit is not entering the speed regulation dead zone, taking the speed set value as the final speed value.

[0094] In some embodiments, the step S12 of determining the speed regulation state of the double-fed variable speed pumping and storage unit based on the first determination result and the second determination result specifically comprises the step S15 of: performing an AND operation on the first determination result and the second determination result to obtain a first output result; inputting the first output result to a set end of a set-reset flip-flop, and inputting a signal exclusive to the first output result to a reset end of the set-reset flip-flop to obtain a flag bit output by the set-reset flip-flop according to the first output result and the signal exclusive to the first output result, wherein a value of the flag bit identifies whether the double-fed variable speed pumping and storage unit enters a speed regulation dead zone.

[0095] That is, the determination result of whether the double-fed variable speed pumping and storage unit enters the speed regulation dead zone is represented by a flag bit output by a set-reset flip-flop (hereinafter referred to as an SR flip-flop).

[0096] Specifically, the SR flip-flop comprises a set end S and a reset end R, and the working principle of the SR flip-flop is as follows:

[0097] When S = 1 and R = 0, the flip-flop enters a set state and the output is 1.

[0098] When S = 0 and R = 1, the flip-flop enters a reset state and the output is 0.

[0099] When S = 0 and R = 0, the flip-flop is in a hold state and the output remains consistent with the previous state.

[0100] When S = 1 and R = 1, the flip-flop is in a forbidden state and the output is uncertain.

[0101] In the embodiments of the present disclosure, since the R end of the SR flip-flop inputs a signal exclusive to the S end, the SR flip-flop provided in the embodiments of the present disclosure will not be in the forbidden state with S = 1 and R = 1, so that the output is uncertain. At the same time, the value of the first output result represents whether the double-fed variable speed pumping and storage unit enters the speed regulation dead zone, and the first output result is input to the S end of the SR flip-flop, so that the output of the SR flip-flop remains consistent with the first output result. Therefore, the flag bit output by the SR flip-flop can identify whether the double-fed variable speed pumping and storage unit enters the speed regulation dead zone.

[0102] Further, according to the step S13, since the double-fed variable pumped storage unit enters the speed regulation dead zone, the final value of the rotational speed determined and sent to the AC excitation control system is determined by the upper limit value or the lower limit value of the speed regulation dead zone, which is different from the rotational speed set value output by the PID controller 10. Because there is a deviation between the unit power set value SPp and the actual power value PVp, the rotational speed set value output by the PID controller 10 will continuously increase or decrease due to the integral action, resulting in a large deviation between the rotational speed set value output by the PID controller 10 and the actual required governor set value when the double-fed variable pumped storage unit exits the speed regulation dead zone. Therefore, at the moment when the double-fed variable pumped storage unit exits the speed regulation dead zone, it is still necessary to keep the speed regulation state the same as the previous state, so that the final value of the speed regulation determined according to the speed regulation state is more in line with the actual needs.

[0103] The embodiment of the present disclosure adopts the identification bit output by the SR flip-flop to identify whether the double-fed variable pumped storage unit enters the speed regulation dead zone, and can use the holding function of the SR flip-flop to keep the state at the previous moment at the moment when the double-fed variable pumped storage unit exits the speed regulation dead zone, so that the final value of the unit obtained is more accurate.

[0104] In some embodiments, the step of inputting the signal mutually exclusive with the first output result into the reset end of the set-reset flip-flop in step S15 specifically includes the following steps:

[0105] determining whether the first difference is greater than or equal to a preset second value and the final value of the rotational speed is greater than the rated rotational speed to obtain a third determination result; determining whether the first difference is less than or equal to a preset first value or its opposite number and the final value of the rotational speed is greater than the rated rotational speed to obtain a fourth determination result; determining whether the first difference is greater than or equal to the preset first value and the final value of the rotational speed is less than the rated rotational speed to obtain a fifth determination result; determining whether the first difference is less than or equal to the preset second value or its opposite number and the final value of the rotational speed is less than the rated rotational speed to obtain a sixth determination result; performing an OR operation on the third determination result, the fourth determination result, the fifth determination result and the sixth determination result to obtain a signal mutually exclusive with the first output result; and inputting the signal mutually exclusive with the first output result into the reset end of the set-reset flip-flop. This setting can ensure that the input of the R end and the input of the S end are mutually exclusive signals, thereby ensuring that the flag bit output by the SR flip-flop will not appear an uncertain state.

[0106] Figure 4 A logic determination diagram of the flag bit output by the SR flip-flop is provided for the embodiment of the present disclosure. The logic of the flag bit output by the SR flip-flop can be referred to in Figure 4 For example, Figure 4As shown, SPn-PVp represents the first difference; the result of the AND operation of SPn≤100.2% and SPn≥99.8% is the first judgment result; the result of the AND operation of SPn-PVp>-P1 and SPn-PVp

[0107] Further, the result of the AND operation of SPn-PVp≥P2 and FSPn>N is the third judgment result; the result of the AND operation of SPn-PVp≤-P1 and FSPn>N is the fourth judgment result; the result of the AND operation of SPn-PVp≥P1 and FSPn

[0108] Of course, the input of the R terminal can also be other input signals that are mutually exclusive with the input of the S terminal, and the present disclosure does not limit this.

[0109] In some embodiments, the control method not only includes steps S11-S15, but also includes step S16, specifically including the following steps:

[0110] When the speed regulation state is in the speed regulation dead zone, the inputs of the unit set power input terminal and the unit actual power input terminal of the feedback controller are both the unit actual power; when the speed regulation state is not in the speed regulation dead zone, the input of the unit set power input terminal of the feedback controller is the unit power set value, and the input of the unit actual power input terminal is the unit actual power.

[0111] Specifically, since the double-fed variable pumping storage unit enters the speed regulation dead zone, the final speed value determined and sent to the AC excitation control system is determined by the upper limit value or the lower limit value of the speed regulation dead zone, which is different from the speed set value output by the PID controller 10. Because there is a deviation between the unit power set value SPp and the actual power value PVp, the speed set value output by the PID controller 10 will continue to increase or decrease due to the integral action, resulting in a large deviation between the speed set value output by the PID controller 10 and the actual required governor set value when the double-fed variable pumping storage unit exits the speed regulation dead zone. Therefore, the purpose of step S16 is to design the unit power to adjust the speed regulation dead zone, so that the PID controller 10 stops calculating when the double-fed variable pumping storage unit enters the speed regulation dead zone.

[0112] Figure 5 A control logic schematic diagram of step S16 provided for an embodiment of the present disclosure.

[0113] In some embodiments, the step S16, the input of the unit set power input end and the unit actual power input end of the feedback controller is controlled to be the unit actual power when the speed regulation state is entering the speed regulation dead zone, specifically comprising the following steps:

[0114] When the value of the flag bit indicates that the double-fed variable pumping storage unit enters the speed regulation dead zone, a preset third value P3 is outputted; whether the absolute value of the first difference (SPp-PVp) is greater than the preset third value P3 is judged to obtain a seventh judgment result; if the seventh judgment result is no, the input of the unit set power input end SP and the unit actual power input end PV of the feedback controller is controlled to be the unit actual power; wherein the preset third value P3 is greater than the preset first value P1 and the preset second value P2. It can be understood that the preset third value P3 can be any value greater than the preset first value P1 and the preset second value P2.

[0115] In some embodiments, when the speed regulation state is not in the speed regulation dead zone, the input of the unit set power input end of the feedback controller is controlled to be the unit power set value, and the input of the unit actual power input end is controlled to be the unit actual power, comprising: when the value of the flag bit indicates that the double-fed variable pumping storage unit does not enter the speed regulation dead zone, 0 is outputted; whether the absolute value of the first difference (SPp-PVp) is greater than 0 is judged to obtain an eighth judgment result; if the eighth judgment result is yes, the input of the unit set power input end SP of the feedback controller is controlled to be the unit power set value, and the input of the unit actual power input end PV is controlled to be the unit actual power.

[0116] Specifically, as shown in Figure 5 the absolute value of the first difference SPp-PVp is always positive, therefore, when the flag bit is 0, that is, the double-fed variable pumping storage unit does not enter the speed regulation dead zone, 0 is outputted, at this time the absolute value of the first difference SPp-PVp is always greater than 0, then the input of the SP end of the PID control is the unit power set value, at this time the PID controller normally calculates; on the contrary, when the flag bit is 1, that is, the double-fed variable pumping storage unit enters the speed regulation dead zone, P3 is outputted, and P3 is greater than P1 and P3 is greater than P2, and according to Figure 4 shown, when the double-fed variable pumping storage unit enters the speed regulation dead zone, SPp-PVp is less than P2, therefore, P3 is also always greater than the absolute value of the first difference SPp-PVp, then the input of the SP end of the PID control is the unit actual power, at this time the PID controller stops calculating.

[0117] It can be understood that step S16 can also be other logic control, as long as it is ensured that the PID controller stops calculation when the double-fed variable pumping and storage unit enters the speed regulation dead zone, and the present disclosure does not limit this.

[0118] The double-fed variable pumping and storage unit power control method in the pumping condition provided by the embodiments of the present disclosure determines the logic that the double-fed variable pumping and storage unit enters the speed regulation dead zone through the speed set value, the unit power set value and the actual unit power output by the PID controller; after the double-fed variable pumping and storage unit enters the speed regulation dead zone, the final speed value is determined based on the speed set value at the current time and the rated speed, so that the determined final speed value is neither in the speed regulation dead zone range, ensuring the normal operation of the double-fed variable pumping and storage unit, nor can it meet the actual speed requirement to the greatest extent; finally, when the double-fed variable pumping and storage unit exits the speed regulation dead zone, the PID controller is controlled to stop calculation in order to avoid the gap between the speed set value calculated by the PID controller and the actual required speed being too large. The logic provided by the embodiments of the present disclosure when the double-fed variable pumping and storage unit passes through the speed regulation dead zone range avoids the problem of unit power oscillation caused by the speed regulator repeatedly passing through the edge of the speed regulation dead zone due to the difference between the power set value and the actual value, and has important significance for the frequency control stability in the pumping condition and the safe operation of the unit.

[0119] In a second aspect, based on the same inventive concept, the embodiments of the present disclosure also provide a double-fed variable pumping and storage unit.

[0120] Figure 6 A structural block diagram of a double-fed variable pumping and storage unit provided by the embodiments of the present disclosure is shown in FIG. 1. As shown in the figure, the double-fed variable pumping and storage unit 100 includes a feedback controller 10, a processor 40, an alternating current excitation control system 20 and a water pump 30. Figure 6

[0121] The feedback controller 10 is configured to calculate the speed set value according to the input value of the unit set power input end and the input value of the actual unit power input end.

[0122] The processor 40 is connected with the feedback controller 10, and the processor 40 is configured to determine the speed regulation state of the double-fed variable pumping and storage unit according to the speed set value, the unit power set value and the actual unit power when the double-fed variable pumping and storage unit is in the pumping condition, and the speed regulation state includes entering the speed regulation dead zone or not entering the speed regulation dead zone. The processor 40 is further configured to determine the final speed value according to the speed regulation state of the double-fed variable pumping and storage unit, the rated speed of the unit and / or the speed set value, and send the final speed value to the alternating current excitation control system 20.

[0123] ​The AC excitation control system 20 is connected with the processor 40, and the AC excitation control system 20 is configured to control the rotation of the water pump 30 based on the final value of the rotating speed. The water pump 30 is connected with the AC excitation control system 20, and the water pump 30 is further connected with the feedback controller 10 and configured to feed back the actual power output by the water pump 30 to the feedback controller 10.

[0124] In some embodiments, the double-fed variable pumping and storage unit 100 not only includes the feedback controller 10, the processor 40, the AC excitation control system 20 and the water pump 30, but also includes a set-reset flip-flop (hereinafter referred to as an SR flip-flop) 50. The processor 40 is connected with the feedback controller 10 and the AC excitation control system 20 through the set-reset flip-flop 50.

[0125] In some embodiments, the processor 40 is specifically configured to perform the following steps:

[0126] The difference between the unit power set value and the actual unit power is calculated to obtain a first difference value; it is judged whether the rotating speed set value is in the rotating speed adjustment dead zone range to obtain a first judgment result; it is judged whether the first difference value is greater than the opposite of a preset first value and less than a preset second value to obtain a second judgment result; the first judgment result and the second judgment result are subjected to AND operation to obtain a first output result; the first output result is input to the set end of the set-reset flip-flop, and a signal exclusive to the first output result is input to the reset end of the set-reset flip-flop.

[0127] The set-reset flip-flop 50 is configured to output a flag bit according to the first output result input to the set end of the set-reset flip-flop and the signal exclusive to the first output result input to the reset end of the set-reset flip-flop; and the value of the flag bit identifies whether the double-fed variable pumping and storage unit enters the rotating speed dead zone.

[0128] In some embodiments, when the processor 40 performs the step of inputting the signal exclusive to the first output result to the reset end of the set-reset flip-flop, the processor 40 specifically includes the following steps:

[0129] determining whether the first difference is greater than or equal to a preset second value and whether the final value of the rotating speed is greater than the rated rotating speed, to obtain a third determination result; determining whether the first difference is less than or equal to a reverse of a preset first value and whether the final value of the rotating speed is greater than the rated rotating speed, to obtain a fourth determination result; determining whether the first difference is greater than or equal to the preset first value and whether the final value of the rotating speed is less than the rated rotating speed, to obtain a fifth determination result; determining whether the first difference is less than or equal to a reverse of the preset second value and whether the final value of the rotating speed is less than the rated rotating speed, to obtain a sixth determination result; performing an OR operation on the third determination result, the fourth determination result, the fifth determination result and the sixth determination result, to obtain a signal exclusive to the first output result; and inputting the signal exclusive to the first output result into the reset end of the set-reset flip-flop.

[0130] In some embodiments, when determining the final value of the rotating speed according to the speed regulation state of the double-fed variable pumping storage unit, the rated rotating speed of the unit and / or the rotating speed setting value, the processor 40 specifically comprises the following steps:

[0131] When the speed regulation state of the double-fed variable pumping storage unit is entering the speed regulation dead zone, it is determined whether the rotating speed setting value is greater than the rated rotating speed; if the rotating speed setting value is greater than the rated rotating speed, the final value of the rotating speed is determined based on the upper limit value of the rotating speed regulation dead zone range of the double-fed variable pumping storage unit; if the rotating speed setting value is less than or equal to the rated rotating speed, the final value of the rotating speed is determined based on the lower limit value of the rotating speed regulation dead zone range of the double-fed variable pumping storage unit.

[0132] In some embodiments, when determining the final value of the rotating speed according to the speed regulation state of the double-fed variable pumping storage unit, the rated rotating speed of the unit and / or the rotating speed setting value, the processor 40 specifically further comprises the following step: when the speed regulation state of the double-fed variable pumping storage unit is not entering the speed regulation dead zone, the rotating speed setting value is taken as the final value of the rotating speed.

[0133] In some embodiments, the processor 40 is further configured to: when the speed regulation state is entering the speed regulation dead zone, control the inputs of the unit setting power input end and the unit actual power input end of the feedback controller to be the unit actual power; and when the speed regulation state is not in the speed regulation dead zone, control the input of the unit setting power input end of the feedback controller to be the unit power setting value and the input of the unit actual power input end to be the unit actual power.

[0134] In some embodiments, when the processor 40 performs the control that the inputs of the unit setting power input end and the unit actual power input end of the feedback controller are the unit actual power when the speed regulation state is entering the speed regulation dead zone, the processor 40 is specifically configured to perform the following steps:

[0135] outputting a preset third value when the value of the flag bit indicates that the doubly-fed variable pumping and storage unit enters the speed regulation dead zone; determining whether the absolute value of the first difference is greater than the preset third value to obtain a seventh determination result; if the seventh determination result is no, controlling the input of the unit set power input end and the unit actual power input end of the feedback controller to be the unit actual power; wherein the preset third value is greater than the preset first value and the preset second value.

[0136] In some embodiments, when the speed regulation state is not in the speed regulation dead zone, the processor 40 performs the step of controlling the input of the unit set power input end of the feedback controller to be the unit power set value and the input of the unit actual power input end to be the unit actual power, the processor 40 is specifically configured to perform the following steps:

[0137] outputting 0 when the value of the flag bit indicates that the doubly-fed variable pumping and storage unit does not enter the speed regulation dead zone; determining whether the absolute value of the first difference is greater than 0 to obtain an eighth determination result; if the eighth determination result is yes, controlling the input of the unit set power input end of the feedback controller to be the unit power set value and the input of the unit actual power input end to be the unit actual power.

[0138] It should be noted that other details of the doubly-fed variable pumping and storage unit provided by the embodiments of the present disclosure are the same as the embodiments of the doubly-fed variable pumping and storage unit power control method provided by the first aspect described above, and will not be repeated here.

[0139] In a third aspect, the embodiments of the present disclosure further provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method of any one of the first aspect when executing the computer program.

[0140] In a fourth aspect, the embodiments of the present disclosure further provide a computer readable storage medium, which stores the computer program of the method of any one of the first aspect.

[0141] In a fifth aspect, the embodiments of the present disclosure further provide a computer program product, including computer programs / instructions, which implement the steps of the method of any one of the first aspect when executed by a processor.

[0142] Those skilled in the art will appreciate that embodiments of the disclosure can be supplied as a method, a system, or a computer program product. Accordingly, the disclosure can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the disclosure can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, and the like) embodying computer readable program code.

[0143] The disclosure is described in reference to the flowchart and / or block diagrams of the method, apparatus (system) and computer program product according to embodiments of the disclosure. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as a combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing apparatus to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing apparatus produce a device that implements the flow Figure 1 one or more flows and / or blocks Figure 1 an apparatus that implements the function specified in the flow or flows and / or block or blocks.

[0144] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to work in a specific manner, so that the instructions stored in the computer readable memory produce a manufactured product including instruction apparatus, which implements the flow Figure 1 one or more flows and / or blocks Figure 1 an apparatus that implements the function specified in the flow or flows and / or block or blocks.

[0145] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable data processing apparatus to produce a computer implemented process, so that the instructions executed on the computer or other programmable data processing apparatus provide a process for implementing the flow Figure 1 one or more flows and / or blocks Figure 1 an apparatus that implements the function specified in the flow or flows and / or block or blocks.

[0146] The specific embodiments in the disclosure are applied to the principles and implementation of the disclosure, and the above description of the embodiments is only for the purpose of helping to understand the method of the disclosure and its core idea; at the same time, for those skilled in the art, according to the idea of the disclosure, there will be changes in specific implementation and application range, and the above description of the disclosure should not be understood as a limitation.

Claims

1. A method for controlling the power of a doubly-fed variable pumped-storage unit during pumping operation, wherein the doubly-fed variable pumped-storage unit includes a feedback controller, an AC excitation control system connected to the feedback controller, and a water pump connected to the AC excitation control system, characterized in that... The method includes: Under the pumping operation of the doubly fed variable pumped storage unit, the unit power setpoint, the actual unit power, and the speed setpoint output by the feedback controller are obtained. The speed regulation state of the doubly-fed variable pumped storage unit is determined based on the speed setting value, the unit power setting value, and the actual power of the unit. The speed regulation state includes entering the speed regulation dead zone or not entering the speed regulation dead zone. The final speed value is determined based on the speed regulation status of the doubly fed variable pumped storage unit, the rated speed of the unit, and / or the speed set value. The final rotational speed value is sent to the AC excitation control system, wherein the AC excitation control system is used to control the water pump rotation based on the final rotational speed value; Based on the set speed value, the set power value, and the actual power of the unit, the speed regulation state of the doubly-fed variable pumped-storage unit is determined, including: Calculate the difference between the unit power setpoint and the unit actual power to obtain the first difference; Determine whether the speed setting value is within the speed adjustment dead zone range to obtain a first determination result; Determine whether the first difference is greater than the opposite of a preset first value and whether the first difference is less than a preset second value to obtain a second determination result; Based on the first judgment result and the second judgment result, the speed regulation state of the doubly fed variable pumped storage unit is determined.

2. The control method according to claim 1, characterized in that, Based on the first judgment result and the second judgment result, the speed regulation state of the doubly-fed variable pumped-storage unit is determined, including: Perform a bitwise AND operation on the first judgment result and the second judgment result to obtain the first output result; The first output result is input to the set terminal of the set-reset trigger, and a signal mutually exclusive with the first output result is input to the reset terminal of the set-reset trigger to obtain a flag bit output by the set-reset trigger based on the first output result and the signal mutually exclusive with the first output result. The value of the flag bit indicates whether the doubly fed variable pumped storage unit has entered the speed regulation dead zone.

3. The control method according to claim 2, characterized in that, The step of inputting a signal mutually exclusive with the first output result into the reset terminal of the set-reset trigger specifically includes: A third judgment result is obtained by determining whether the first difference is greater than or equal to a preset second value and whether the final value of the rotational speed is greater than the rated rotational speed. Determine whether the first difference is less than or equal to the opposite of a preset first value, and whether the final value of the rotational speed is greater than the rated rotational speed, to obtain a fourth determination result; Determine whether the first difference is greater than or equal to the preset first value, and whether the final value of the rotational speed is less than the rated rotational speed, to obtain the fifth determination result; Determine whether the first difference is less than or equal to the opposite of the preset second value, and whether the final value of the rotational speed is less than the rated rotational speed, to obtain the sixth determination result; Perform an OR operation on the third judgment result, the fourth judgment result, the fifth judgment result, and the sixth judgment result to obtain a signal that is mutually exclusive with the first output result; A signal mutually exclusive with the first output result is input to the reset terminal of the set-reset trigger.

4. The control method according to any one of claims 1-3, characterized in that, Based on the speed regulation status of the doubly-fed variable pumped-storage unit, the rated speed of the unit, and / or the speed setpoint, the final speed value is determined, including: When the speed regulation state of the doubly fed variable pumped storage unit is in the speed regulation dead zone, it is determined whether the speed setting value is greater than the rated speed. If the set speed value is greater than the rated speed, the final speed value is determined based on the upper limit of the speed regulation dead zone range of the doubly fed variable pumped storage unit. If the set speed is less than or equal to the rated speed, the final speed value is determined based on the lower limit of the speed regulation dead zone range of the doubly fed variable pumped storage unit.

5. The control method according to any one of claims 1-3, characterized in that, Determining the final speed value based on the speed regulation status of the doubly-fed variable pumped-storage unit, the rated speed of the unit, and / or the speed setpoint, further includes: When the speed regulation state of the doubly fed variable pumped storage unit is not in the speed regulation dead zone, the speed set value is taken as the final speed value.

6. The control method according to claim 2, characterized in that, The method further includes: When the speed regulation state is in the speed regulation dead zone, the inputs to both the unit set power input terminal and the unit actual power input terminal of the feedback controller are the unit actual power. When the speed regulation state is not in the speed regulation dead zone, the input of the unit set power input terminal of the feedback controller is the unit power set value, and the input of the unit actual power input terminal is the unit actual power.

7. The control method according to claim 6, characterized in that, When the speed regulation state is in the speed regulation dead zone, the inputs to both the unit set power input terminal and the unit actual power input terminal of the feedback controller are the unit actual power, including: When the value of the flag indicates that the doubly fed variable pumped-storage unit has entered the speed regulation dead zone, a preset third value is output; Determine whether the absolute value of the first difference is greater than the preset third value to obtain the seventh determination result; If the seventh judgment result is negative, then the inputs to the unit set power input terminal and the unit actual power input terminal of the feedback controller are both the unit actual power. The preset third value is greater than the preset first value and the preset second value.

8. The control method according to claim 6, characterized in that, When the speed regulation state is not in the speed regulation dead zone, the input of the unit set power input terminal of the feedback controller is the unit power set value, and the input of the unit actual power input terminal is the unit actual power, including: When the value of the flag indicates that the doubly fed variable pumped-storage unit has not entered the speed regulation dead zone, the output is 0; Determine whether the absolute value of the first difference is greater than 0 to obtain the eighth determination result; If the eighth judgment result is yes, then the input of the unit set power input terminal of the feedback controller is the unit power set value, and the input of the unit actual power input terminal is the unit actual power.

9. A doubly-fed variable pumped-storage unit, characterized in that, include: The feedback controller is configured to calculate the speed setpoint based on the input value at the set power input terminal of the unit and the input value at the actual power input terminal of the unit; A processor, connected to the feedback controller, is configured to determine the speed regulation state of the doubly-fed variable pumped-storage unit under pumping conditions, based on the speed setpoint, the unit power setpoint, and the actual power of the unit. The speed regulation state includes entering or not entering the speed dead zone. The processor is also configured to determine the final speed value based on the speed regulation state of the doubly-fed variable pumped-storage unit, the rated speed of the unit, and / or the speed setpoint, and send the final speed value to the AC excitation control system. An AC excitation control system, connected to the processor, is configured to control the water pump rotation based on the final rotational speed value. The water pump is connected to the AC excitation control system. The doubly-fed variable pumped-storage unit also includes a set-reset trigger, wherein... The processor is specifically configured to perform the following steps: Calculate the difference between the unit power setpoint and the unit actual power to obtain the first difference; Determine whether the speed setting value is within the speed adjustment dead zone range to obtain a first determination result; Determine whether the first difference is greater than the opposite of a preset first value and whether the first difference is less than a preset second value to obtain a second determination result; Perform a bitwise AND operation on the first judgment result and the second judgment result to obtain the first output result; The first output result is input to the set terminal of the set-reset trigger, and a signal mutually exclusive with the first output result is input to the reset terminal of the set-reset trigger. The set-reset trigger is configured to output a flag bit based on a first output result input at the set terminal of the set-reset trigger and a signal mutually exclusive with the first output result input at the reset terminal; wherein the value of the flag bit indicates whether the doubly fed variable pumped-storage unit has entered the speed regulation dead zone.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method according to any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that performs the method according to any one of claims 1 to 8.

12. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method according to any one of claims 1 to 8.

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