Water pumping working condition power control method for doubly-fed variable pumped storage unit

Abstract

The invention provides a water pumping working condition power control method for a doubly-fed variable pumped storage unit and the doubly-fed variable pumped storage unit. The control method comprises the steps that under the water pumping working condition of the doubly-fed variable pumped storage unit, a unit power set value, unit actual power and a rotating speed set value output by a feedback controller are obtained; according to the rotating speed set value, the unit power set value and the unit actual power, the speed regulation state of the doubly-fed variable pumped storage unit is determined, and the speed regulation state comprises entering a speed regulation dead zone or not entering the speed regulation dead zone; determining a final rotating speed value according to the speed regulation state of the doubly-fed variable pumped storage unit, the rated rotating speed of the unit and / or the rotating speed set value; and the rotating speed final value is sent to the alternating current excitation control system, and the alternating current excitation control system is used for controlling the water pump to rotate based on the rotating speed final value. According to the control method provided by the invention, low-frequency oscillation accidents caused by the speed regulation dead zone of the unit can be avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of pumped storage, and specifically relates to a method for controlling pumping power of a double-fed variable pumped storage unit, a double-fed variable pumped storage unit, an electronic device, a computer-readable storage medium, and a computer program product. Background Art

[0002] As an efficient and clean power source, pumped storage units have the advantages of flexible start and stop and fast response. Pumped storage units play a very important role in promoting the large-scale development and utilization of new energy, enhancing the reliable supply capacity of the power system and ensuring the safety and stability of the power system. At the same time, they can also optimize the power structure, achieve green environmental protection, achieve overall energy conservation and consumption reduction of the power system, and improve the overall economic benefits.

[0003] Traditional fixed-speed pumped storage units use synchronous motors, and the unit speed is the same as the grid frequency, so the unit can only run at a constant speed at the synchronous speed. At this time, the fixed-speed unit cannot adapt to large head fluctuations, and the excessive water hammer effect in the hydraulic system can easily cause ultra-low frequency oscillation of the grid frequency. Since the power regulation of the fixed-speed unit is a mechanical process, the regulation speed is slow, and the regulation effect is poor for wind power output with strong randomness and volatility.

[0004] With the development of technology, the new variable-speed pumped-storage unit has achieved the decoupling of the unit speed and system frequency, and has shown better regulation performance than the traditional fixed-speed pumped-storage unit in the frequency and power regulation process of the power grid. The variable-speed pumped-storage unit adopts a doubly-fed motor or a full-power converter, and has the characteristics of variable speed constant frequency operation, which can broaden the operating range of the pump turbine and realize the rapid regulation of active power. Compared with the traditional pumped-storage unit, the advantages and application value of the variable-speed pumped-storage unit are that it has the ability of variable speed constant frequency operation and rapid active and reactive power regulation; improves the operating state of the unit, improves operating efficiency and adaptability to water head; improves the transient stability of the power system, and smoothes the system frequency oscillation caused by the fluctuation of new energy output; the startup and grid-connected process in the pump mode is more stable, and the system frequency can be adjusted when pumping water.

[0005] At present, a number of variable-speed pumped-storage units have been built in some areas, but the application of doubly-fed variable-speed pumped-storage units is still in its infancy, and the problem of the speed governor crossing the speed regulation dead zone in actual situations has not been considered. Summary of the invention

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

[0007] In order to achieve the above-mentioned object, in a first aspect, an embodiment of the present disclosure provides a method for controlling the power of a double-fed variable pumped storage unit under pumping conditions, the method comprising:

[0008] Under the pumping condition of the double-fed variable pumped storage unit, the unit power setting value, the unit actual power and the speed setting value output by the feedback controller are obtained;

[0009] Determine the speed regulation state of the double-fed variable pumped storage unit according to the speed setting value, the unit power setting value and the unit actual power, wherein the speed regulation state includes entering a speed regulation dead zone or not entering a speed regulation dead zone;

[0010] Determining a final speed value according to the speed regulation state of the double-fed variable pumped storage unit, the unit rated speed and / or the speed setting value;

[0011] The final value of the rotational speed is sent to the AC excitation control system, wherein the AC excitation control system is used to control the rotation of the water pump based on the final value of the rotational speed.

[0012] In some embodiments, determining the speed regulation state of the double-fed variable pumped storage unit according to the speed setting value, the unit power setting value and the unit actual power includes:

[0013] Calculating the difference between the set power value of the unit and the actual power of the unit to obtain a first difference;

[0014] Determine whether the speed setting value is within the speed regulation dead zone to obtain a first determination result;

[0015] Determine whether the first difference is greater than the opposite of a preset first value, and the first difference is less than a preset second value, to obtain a second determination result;

[0016] Based on the first judgment result and the second judgment result, the speed regulation state of the double-fed variable pumped storage unit is determined.

[0017] In some embodiments, based on the first judgment result and the second judgment result, determining the speed regulation state of the double-fed variable pumped storage unit includes:

[0018] Performing an AND operation on the first judgment result and the second judgment structure to obtain a first output result;

[0019] The first output result is input into the set end of the set-reset trigger, and a signal mutually exclusive with the first output result is input into the reset end of the set-reset trigger, so as to obtain a flag output by the set-reset trigger according to the first output result and the signal mutually exclusive with the first output result, and the value of the flag indicates whether the double-fed variable pumped storage unit enters the speed regulation dead zone.

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

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

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

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

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

[0025] Performing 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;

[0026] A signal mutually exclusive with the first output result is input into a reset terminal of the set-reset flip-flop.

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

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

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

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

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

[0032] When the speed regulation state of the double-fed variable pumped storage unit is not in the speed regulation dead zone, the speed setting value is used as the final speed value.

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

[0034] When the speed regulation state is in the speed regulation dead zone, the inputs of the set power input terminal and the actual power input terminal of the feedback controller are both the actual power of the unit;

[0035] When the speed regulation state is not in the speed regulation dead zone, the input of the set power input terminal of the feedback controller is the set power setting value, and the input of the set actual power input terminal is the set actual power.

[0036] In some embodiments, when the speed regulation state is in the speed regulation dead zone, the inputs of the set power input terminal and the actual power input terminal of the feedback controller are both the actual power of the unit, including:

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

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

[0039] If the seventh judgment result is no, the inputs of the set power input terminal and the set actual power input terminal of the feedback controller are both the set actual power;

[0040] 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 set power input terminal of the feedback controller is controlled to be the set power setting value, and the input of the set actual power input terminal is the set actual power, including:

[0042] When the value of the flag bit indicates that the double-fed variable pumped storage unit has not entered the speed regulation dead zone, output 0;

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

[0044] If the eighth judgment result is yes, the input of the set power input terminal of the feedback controller is controlled to be the set power setting value, and the input of the set actual power input terminal is the set actual power.

[0045] In a second aspect, the present disclosure further provides a double-fed variable pumped storage unit, comprising: a feedback controller configured to calculate a speed setting value according to an input value of a set power input terminal of the unit and an input value of an actual power input terminal of the unit;

[0046] A processor connected to the feedback controller, wherein the processor is configured to determine the speed regulation state of the doubly-fed variable pumped storage unit according to the speed setting value, the unit power setting value and the unit actual power under the pumping condition, wherein the speed regulation state includes entering the speed regulation dead zone or not entering the speed regulation dead zone; the processor is further configured to determine the final speed value according to the speed regulation state of the doubly-fed variable pumped storage unit, the unit rated speed and / or the speed setting value, and send the final speed value to the AC excitation control system;

[0047] an AC excitation control system connected to the processor, wherein the AC excitation control system is configured to control the rotation of the water pump based on the final value of the rotation speed;

[0048] A water pump is connected to the AC excitation control system.

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

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

[0051] Determine whether the speed setting value is within the speed regulation dead zone to obtain a first determination result;

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

[0053] Performing an AND operation on the first judgment result and the second judgment structure to obtain a first output result;

[0054] Inputting the first output result into a set terminal of a set-reset flip-flop, and inputting a signal mutually exclusive with the first output result into a reset terminal of the set-reset flip-flop;

[0055] The set-reset trigger is configured to output a flag bit according to a first output result input to the set end of the set-reset trigger and a signal input to the reset end that is mutually exclusive with the first output result; wherein the value of the flag bit indicates whether the double-fed variable pumped storage unit enters a speed regulation dead zone.

[0056] In a third aspect, the present disclosure further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the computing method of the first aspect described above is implemented.

[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, including a computer program / instruction, which implements the steps of the computing method of the first aspect when the computer program / instruction is executed by a processor.

[0059] The disclosed embodiment combines the theoretical speed value with the actual power value through the speed setting value, the unit power setting value and the unit actual power to determine the speed regulation state of the doubly fed variable pumped storage unit, which can more accurately determine the speed regulation state of the doubly fed variable pumped storage unit; further, different speed final values ​​are determined for different speed regulation states of the doubly fed variable pumped storage unit, which can improve the stability and safety of power regulation of the variable speed unit in pumping conditions and avoid low-frequency oscillation accidents caused by the speed regulation dead zone of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0061] Figure 1 It is a schematic diagram of a power control method of a variable speed pumped storage unit under pumping conditions in the prior art;

[0062] Figure 2 A flow chart of a method for controlling the pumping power of a double-fed variable pumped storage unit provided in an embodiment of the present disclosure;

[0063] Figure 3 A schematic diagram of a power control method of a variable speed pumped storage unit under pumping conditions provided by an embodiment of the present disclosure;

[0064] Figure 4 A schematic diagram of logic judgment of an SR trigger output flag bit provided in an embodiment of the present disclosure;

[0065] Figure 5 A control logic diagram of step S16 provided in an embodiment of the present disclosure;

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

[0067] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail and completely in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0068] Figure 1 FIG. 1 is a schematic diagram of a power control method of a variable speed pumped storage unit under pumping conditions in the prior art. Figure 1 As shown, the double-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 control process of the pumping power of the double-fed variable pumped storage unit is as follows: the unit setting value input terminal SP of the feedback controller (hereinafter referred to as the PID controller) 10 receives the unit setting power value, the unit actual power input terminal PV of the PID controller 10 receives the unit actual power, and the PID controller 10 calculates the speed setting value according to the received unit setting power value and the unit actual power, and sends the speed setting value to the AC excitation control system 20. The AC excitation control system 20 uses the speed setting value as the actual speed to control the water pump 30 to rotate, and at the same time, the rotation of the water pump 30 outputs the unit actual power and feeds it back to the PID controller 10.

[0069] However, under pumping conditions, the speed range of the doubly fed variable speed pumped storage unit is 93%N-106%N, where N is the rated speed. Due to the properties of the doubly fed variable speed pumped storage unit itself, the unit speed cannot operate within the range of 99.8%N-100.2%N, which is called the speed regulation dead zone. When the power setting value is within the power range corresponding to the speed regulation dead zone (the power range corresponding to different water heads is different), because the actual speed of the unit cannot operate within this range, the speed will repeatedly cross the dead zone, resulting in fluctuations in the unit load regulation and even low-frequency power oscillation.

[0070] Based on the above problems existing in the prior art, the present disclosure proposes a power control scheme for a double-fed variable pumped storage unit under pumping conditions. A control method for when the speed passes through an adjustment dead zone during power regulation of a double-fed variable speed pumped storage unit under pumping conditions includes a judgment of entering a speed regulation dead zone, a control method and a logical action sequence after entering the dead zone, and a logical judgment of a speed regulation system exiting the speed regulation dead zone, so as to improve the stability and safety of power regulation of a double-fed variable pumped storage unit under pumping conditions and avoid low-frequency oscillation accidents caused by the unit due to the speed regulation dead zone.

[0071] In a first aspect, an embodiment of the present disclosure provides a method for controlling power of a double-fed variable pumped storage unit under pumping conditions.

[0072] Figure 2 A flow chart of a method for controlling the pumping power of a double-fed variable pumped storage unit provided in an embodiment of the present disclosure. The double-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. The control method specifically includes the following steps:

[0073] Step S11: Under the pumping condition of the double-fed variable pumped storage unit, obtain the unit power setting value, the unit actual power and the speed setting value output by the feedback controller.

[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 double-fed variable pumped storage unit. The speed setting value refers to the speed value calculated by the feedback controller 10 based on the set power value of the unit and the actual power of the unit. The speed setting value can represent the theoretical speed value of the water pump in the double-fed variable pumped storage unit. Among them, the feedback controller 10 is generally a PID controller (Proportion Integration Differentiation, proportional-integral-differential controller).

[0075] Step S12: determining the speed regulation state of the doubly-fed variable pumped storage unit according to the speed setting value, the unit power setting value and the unit actual power, wherein the speed regulation state includes entering a speed regulation dead zone or not entering a speed regulation dead zone.

[0076] Specifically, under the pumping condition, the unit speed range is 93%N-106%N (N is the rated speed). Due to the properties of the double-fed variable speed pumped storage unit itself, the unit speed cannot operate within the range of 99.8%N-100.2%N, which is called the speed regulation dead zone. The speed setting value represents the theoretical speed value of the water pump in the double-fed variable pumped storage unit. The disclosed embodiment refers to the theoretical speed value of the unit, and determines the speed regulation state of the double-fed variable pumped storage unit in combination with the unit power setting value and the unit actual power, so that the result is more accurate.

[0077] Step S13, determining a final speed value according to the speed regulation state of the double-fed variable pumped storage unit, the rated speed of the unit and / or the speed setting value.

[0078] Specifically, since the actual speed of the unit cannot operate within the speed regulation dead zone, otherwise the speed will repeatedly cross the dead zone, resulting in fluctuations in the load regulation of the unit and even low-frequency power oscillation. The disclosed embodiment combines the speed regulation state of the double-fed variable pumped storage unit to determine the final speed value, which can improve the stability and safety of the power regulation of the variable speed unit in the pumping condition and avoid low-frequency oscillation accidents caused by the speed regulation dead zone of the unit.

[0079] Step S14: sending the final value of the rotational speed to the AC excitation control system, wherein the AC excitation control system is used to control the rotation of the water pump based on the final value of the rotational speed.

[0080] The disclosed embodiment combines the theoretical speed value with the actual power value through the speed setting value, the unit power setting value and the unit actual power to determine the speed regulation state of the doubly fed variable pumped storage unit, which can more accurately determine the speed regulation state of the doubly fed variable pumped storage unit; further, different speed final values ​​are determined for different speed regulation states of the doubly fed variable pumped storage unit, which can improve the stability and safety of power regulation of the variable speed unit in pumping conditions and avoid low-frequency oscillation accidents caused by the speed regulation dead zone of the unit.

[0081] In some embodiments, step S12, determining the speed regulation state of the doubly fed variable pumped storage unit according to the speed setting value, the unit power setting value and the unit actual power, specifically includes: calculating the difference between the unit power setting value and the unit actual power to obtain a first difference; judging whether the speed setting value is within the speed regulation dead zone to obtain a first judgment result; judging whether the first difference is greater than the opposite of a preset first value, and the first difference is less than a preset second value to obtain a second judgment result; based on the first judgment result and the second judgment result, determining the speed regulation state of the doubly fed variable pumped storage unit.

[0082] Among them, when the first judgment result and the second judgment result are both yes, it is determined that the speed regulation state of the doubly fed variable pumped storage unit is entering the speed regulation dead zone; when at least one of the first judgment result and the second judgment result is no, it is determined that the speed regulation state of the doubly fed variable pumped storage unit is not entering the speed regulation dead zone.

[0083] Specifically, assuming 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 P1, and the preset second value is P2. Since SPn is calculated by the PID controller 10, it has continuity. Among them, the preset first value P1 and the preset second value P2 are both positive numbers, which can be used to indicate that during the normal speed of the double-fed variable pumped storage unit, the difference between SPp and PVp satisfies the preset condition, which is generally determined according to the actual situation of the double-fed variable pumped storage unit under pumping conditions. Optionally, the preset first value P1 and the preset second value P2 can be determined according to the speed regulation dead zone range of the double-fed variable pumped storage unit under pumping conditions. Specifically, according to the upper limit and lower limit of the speed regulation dead zone range of the double-fed variable pumped storage unit under the pumping condition, the unit power of the double-fed variable pumped storage unit under the pumping condition corresponding to the upper limit and lower limit are determined respectively, and the second difference of the unit power corresponding to the upper limit and lower limit is calculated, and the result of dividing the second difference by two is calculated to obtain the average value, wherein the preset first value P1 can be a value less than the preset value than the average value, and the preset second value P2 can be a value greater than the preset value than the average value. Among them, 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, assuming that the calculated average value is 8 and the preset value is 1, the preset first value is 7 and the preset second value is 9.

[0084] During the normal speed of the double-fed variable pumped storage unit, the first difference calculated by SPp and PVp generally meets the preset conditions, and the value of the first difference is relatively small. Therefore, the SPn calculated based on SPp and PVp is generally more accurate. Therefore, at this time, it can be judged based on SPn whether the double-fed variable pumped storage unit has entered the speed regulation dead zone. If the SPn calculated based on SPp and PVp is within the speed regulation dead zone, it can be determined that the double-fed variable pumped storage unit is in the speed regulation dead zone. On the contrary, if the SPn calculated based on SPp and PVp is within the speed regulation dead zone, but the first difference calculated by SPp and PVp is relatively large, the SPn calculated based on SPp and PVp will be inaccurate, indicating that the double-fed variable pumped storage unit is not in the speed regulation dead zone at this time.

[0085] Therefore, the idea of ​​designing the speed regulation dead zone in the embodiment of the present disclosure is: when the final calculated value of SPn is within the range of 99.8%N-100.2%N, it is judged that the double-fed variable pumped storage unit enters the speed regulation dead zone. If the current calculated value of SPn is within the range of 99.8%N-100.2%N, but the current load setting value has a large deviation from the actual value (that is, the deviation between the unit power setting value and the unit actual power is large), SPn will eventually be out of the speed regulation dead zone.

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

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

[0088] When the speed regulation state of the double-fed variable pumped storage unit is entering a speed regulation dead zone, determining whether the speed setting value is greater than the rated speed;

[0089] If the speed setting value is greater than the rated speed, determining the speed final value 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 setting value is less than or equal to the rated speed, the speed final 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, where N is the rated speed. The double-fed variable pumped storage unit cannot operate within the speed regulation dead zone range. Therefore, if the speed setting value at this moment is greater than the rated speed, a value that is larger than the upper limit value of the speed regulation dead zone range by a preset range can be used as the final speed value, for example, 100.21%N, or 100.22%N, etc., which are slightly larger than the upper limit value of the speed regulation dead zone range; conversely, if the speed setting value at this moment is less than or equal to the rated speed, a value that is smaller than the lower limit value of the speed regulation dead zone range by a preset range can be used as the final speed value, for example, 99.79%N, or 99.78%N, etc., which are slightly smaller than the lower limit value of the speed regulation dead zone range, wherein the preset range can be determined according to actual conditions, and the present disclosure does not limit this.

[0092] In the disclosed embodiment, 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 setting value calculated at the current moment and the rated speed, so that the determined final speed value is neither within the speed regulation dead zone, so that the double-fed variable pumped storage unit can operate normally, nor the final speed value determined is closer to the actual operating conditions.

[0093] In some embodiments, step S13, determining the final value of the speed according to the speed regulation state of the doubly fed variable pumped storage unit, the rated speed of the unit and / or the speed setting value, specifically also includes: when the speed regulation state of the doubly fed variable pumped storage unit is not entering the speed regulation dead zone, using the speed setting value as the final value of the speed.

[0094] In some embodiments, in step S12, the speed regulation state of the double-fed variable pumped storage unit is determined based on the first judgment result and the second judgment result, specifically including step S15: performing an AND operation on the first judgment result and the second judgment structure to obtain a first output result; inputting the first output result into the set end of the set-reset trigger, and inputting a signal that is mutually exclusive with the first output result into the reset end of the set-reset trigger, to obtain a flag bit output by the set-reset trigger according to the first output result and the signal that is mutually exclusive with the first output result, and the value of the flag bit indicates whether the double-fed variable pumped storage unit has entered a speed regulation dead zone.

[0095] That is, the judgment result of whether the double-fed variable pumped storage unit enters the speed regulation dead zone is represented by the flag bit output by the set-reset trigger (hereinafter referred to as SR trigger).

[0096] Specifically, the SR trigger includes a set terminal S and a reset terminal R. The working principle of the SR trigger is as follows:

[0097] When S=1, R=0, the trigger enters the set state and the output is 1.

[0098] When S=0, R=1, the trigger enters the reset state and the output is 0.

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

[0100] When S=1, R=1, the trigger is in the disabled state and the output is uncertain.

[0101] In the embodiment of the present disclosure, since the signals of the R-terminal input and the S-terminal input of the SR trigger are mutually exclusive, the SR trigger provided by the embodiment of the present disclosure will not have S=1, R=1, and the trigger is in a prohibited state, making the output uncertain. At the same time, the value of the first output result indicates whether the double-fed variable speed pumped storage unit has entered the speed regulation dead zone. The first output result is not input to the S-terminal of the SR trigger, so that the output of the SR trigger is consistent with the first output result. Therefore, the flag bit output by the SR trigger can indicate whether the double-fed variable speed pumped storage unit has entered the speed regulation dead zone.

[0102] Further, according to the above step S13, it can be known that after the double-fed variable pumped 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 or lower limit of the speed regulation dead zone range, which is different from the speed setting value output by the PID controller 10. Because there is a deviation between the unit power setting value SPp and the actual power value PVp, the speed setting value output by the PID controller 10 will continue to increase or decrease due to the integral effect, resulting in a large deviation between the speed setting value output by the PID controller 10 and the actual required speed regulator setting 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 it can be ensured that the final speed regulation value determined according to the speed regulation state is more in line with actual needs.

[0103] The disclosed embodiment uses the identification bit output by the SR trigger to indicate whether the double-fed variable pumped storage unit has entered the speed regulation dead zone. The holding function of the SR trigger can be used to maintain the state of the previous moment when the double-fed variable pumped storage unit exits the speed regulation dead zone, so that the final value of the speed regulation unit obtained is more accurate.

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

[0105] Determine whether the first difference is greater than or equal to the preset second value, and whether the final speed value is greater than the rated speed, to obtain a third judgment result; determine whether the first difference is less than or equal to the opposite of the preset first value, and whether the final speed value is greater than the rated speed, to obtain a fourth judgment result; determine whether the first difference is greater than or equal to the preset first value, and whether the final speed value is less than the rated speed, to obtain a fifth judgment result; determine whether the first difference is less than or equal to the opposite of the preset second value, and whether the final speed value is less than the rated speed, to obtain a sixth judgment 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 mutually exclusive with the first output result; input the signal mutually exclusive with the first output result into the reset end of the set-reset trigger. Such a 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 trigger will not appear in an uncertain state.

[0106] Figure 4 This is a schematic diagram of the logic judgment of the SR trigger output flag bit provided by the embodiment of the present disclosure. The logic of the specific SR trigger output flag bit can be found in Figure 4 ,like 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<P2 is the second judgment result; the result of the AND operation of the first judgment result and the second judgment result is the first output result, which is the result of whether the double-fed variable pumped storage unit enters the speed regulation dead zone, and serves as the S-end input of the SR trigger.

[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<N is the fifth judgment result; the result of the AND operation of SPn-PVp≤-P2 and FSPn<N is the sixth judgment result; and the third judgment result, the fourth judgment result, the fifth judgment result and the sixth judgment result are ORed to obtain a signal mutually exclusive with the first output result; and the signal mutually exclusive with the first output result is used as the R terminal of the SR trigger. Among them, FSPn represents the final value of the speed, and N is the rated speed.

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

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

[0110] When the speed regulation state is entering the speed regulation dead zone, the inputs of the unit set power input terminal and the unit actual power input terminal that control 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 that controls the feedback controller is the unit power setting value, and the input of the unit actual power input terminal is the unit actual power.

[0111] Specifically, after the double-fed variable pumped 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 or lower limit of the speed regulation dead zone range, which is different from the speed setting value output by the PID controller 10. Because there is a deviation between the unit power setting value SPp and the actual power value PVp, the speed setting value output by the PID controller 10 will continue to increase or decrease due to the integral effect, resulting in a large deviation between the speed setting value output by the PID controller 10 and the actual required speed regulator setting value when the double-fed variable pumped 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 pumped storage unit enters the speed regulation dead zone.

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

[0113] In some embodiments, step S16, when the speed regulation state is in the speed regulation dead zone, the inputs of the set power input terminal and the actual power input terminal of the feedback controller are both the actual power of the unit, specifically comprising the following steps:

[0114] When the value of the flag indicates that the double-fed variable pumped storage unit enters the speed regulation dead zone, the preset third value P3 is output; it is judged whether the absolute value of the first difference (SPp-PVp) is greater than the preset third value P3, and the seventh judgment result is obtained; if the seventh judgment result is no, the input of the set power input terminal SP of the feedback controller and the input of the actual power input terminal PV of the unit are both the actual power of the unit; 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 terminal of the feedback controller is controlled to be 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 bit indicates that the double-fed variable pumped storage unit has not entered the speed regulation dead zone, output 0; determine whether the absolute value of the first difference (SPp-PVp) is greater than 0, and obtain an eighth judgment result; if the eighth judgment result is yes, then the input of the unit set power input terminal SP of the feedback controller is controlled to be the unit power set value, and the input of the unit actual power input terminal PV is the unit actual power.

[0116] Specifically, Figure 5 As shown, the absolute value of the first difference SPp-PVp must be a positive number. Therefore, when the flag is 0, that is, the double-fed variable pumped storage unit has not entered the speed regulation dead zone, the output is 0. At this time, the absolute value of the first difference SPp-PVp must be greater than 0, and the SP end input of the PID control is the unit power setting value. At this time, the PID controller calculates normally; on the contrary, when the flag is 1, that is, the double-fed variable pumped storage unit enters the speed regulation dead zone, the output is P3, and P3 is greater than P1 and P3 is greater than P2, and according to Figure 4 As shown in the figure, when the double-fed variable pumped storage unit enters the speed regulation dead zone, SPp-PVp is less than P2, so P3 must also be greater than the absolute value of the first difference SPp-PVp. The SP end input of the PID control is the actual power of the unit, and the PID controller stops calculating at this time.

[0117] It is understandable that step S16 can also be other logical controls, as long as it ensures that the PID controller stops calculating when the double-fed variable pumped storage unit enters the speed regulation dead zone, and the present disclosure does not impose any restrictions on this.

[0118] The power control method for the pumping condition of the double-fed variable pumped storage unit provided in the embodiment of the present disclosure determines the logic of the double-fed variable pumped storage unit entering the speed regulation dead zone through the speed setting value, the unit power setting value and the actual power of the unit output by the PID controller; after the double-fed variable pumped storage unit enters the speed regulation dead zone, the final speed value is determined based on the speed setting value at the current moment and the rated speed, so that the determined final speed value is neither within the speed regulation dead zone range, ensuring the normal operation of the double-fed variable pumped storage unit, and can meet the actual speed requirements to the greatest extent; finally, when the double-fed variable pumped storage unit exits the speed regulation dead zone, in order to avoid the speed setting value calculated by the PID controller and the actual required speed The speed setting value is too large, the PID controller is controlled to stop calculating. The logic of the double-fed variable pumped storage unit provided in the embodiment of the present disclosure when crossing the speed regulation dead zone range avoids the problem of unit power oscillation caused by the speed regulator repeatedly crossing the edge of the speed regulation dead zone due to the difference between the power setting value and the actual value, which is of great significance for the stable frequency control of the pumping condition and the safe operation of the unit.

[0119] On the second aspect, based on the same inventive concept, the disclosed embodiment also provides a double-fed variable pumped storage unit.

[0120] Figure 6 This is a structural block diagram of a double-fed variable pumped storage unit provided in an embodiment of the present disclosure. Figure 6 As shown, the double-fed variable pumped storage unit 100 includes: a feedback controller 10 , a processor 40 , an AC excitation control system 20 and a water pump 30 .

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

[0122] The processor 40 is connected to the feedback controller 10, and the processor 40 is configured to determine the speed regulation state of the double-fed variable pumped storage unit according to the speed setting value, the unit power setting value and the actual power of the unit under 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 also configured to determine the final speed value according to the speed regulation state of the double-fed variable pumped storage unit, the unit rated speed and / or the speed setting value, and send the final speed value to the AC excitation control system 20.

[0123] The AC excitation control system 20 is connected to 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 speed. The water pump 30 is connected to the AC excitation control system 20, and the water pump 30 is also connected to the feedback controller 10, and is 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 pumped storage unit 100 includes not only a feedback controller 10, a processor 40, an AC excitation control system 20 and a water pump 30, but also a set-reset trigger (hereinafter referred to as SR trigger) 50. The processor 40 is connected to the feedback controller 10 and the AC excitation control system 20 through the set-reset trigger 50.

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

[0126] Calculate the difference between the unit power setting value and the unit actual power to obtain a first difference; determine whether the speed setting value is within the speed regulation dead zone to obtain a first judgment result; determine whether the first difference is greater than the opposite of a preset first value, and the first difference is less than a preset second value to obtain a second judgment result; perform an AND operation on the first judgment result and the second judgment structure to obtain a first output result; input the first output result into the set end of a set-reset trigger, and input a signal that is mutually exclusive with the first output result into the reset end of the set-reset trigger.

[0127] The set-reset trigger 50 is configured to output a flag bit according to a first output result input to the set end of the set-reset trigger and a signal input to the reset end that is mutually exclusive with the first output result; wherein the value of the flag bit indicates whether the double-fed variable pumped storage unit enters a speed regulation dead zone.

[0128] In some embodiments, when the processor 40 executes the step of inputting the signal mutually exclusive with the first output result into the reset terminal of the set-reset flip-flop, the following steps are specifically included:

[0129] Determine whether the first difference is greater than or equal to the preset second value, and whether the final speed value is greater than the rated speed, to obtain a third judgment result; determine whether the first difference is less than or equal to the opposite of the preset first value, and whether the final speed value is greater than the rated speed, to obtain a fourth judgment result; determine whether the first difference is greater than or equal to the preset first value, and whether the final speed value is less than the rated speed, to obtain a fifth judgment result; determine whether the first difference is less than or equal to the opposite of the preset second value, and whether the final speed value is less than the rated speed, to obtain a sixth judgment 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; input the signal that is mutually exclusive with the first output result into the reset end of the set-reset trigger.

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

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

[0132] In some embodiments, when the processor 40 determines the final value of the speed according to the speed regulation state of the doubly fed variable pumped storage unit, the rated speed of the unit and / or the speed setting value, it specifically also includes: when the speed regulation state of the doubly fed variable pumped storage unit is not entering the speed regulation dead zone, using the speed setting value as the final value of the speed.

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

[0134] In some embodiments, when the speed regulation state is entering the speed regulation dead zone, the processor 40 controls the input of the set power input terminal and the actual power input terminal of the feedback controller to be the actual power of the unit, and the processor 40 is specifically configured to perform the following steps:

[0135] When the value of the flag bit indicates that the double-fed variable pumped storage unit enters the speed regulation dead zone, a preset third value is output; whether the absolute value of the first difference is greater than the preset third value is judged to obtain a seventh judgment result; if the seventh judgment result is no, 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; 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 executes the steps of controlling the input of the set power input terminal of the feedback controller to be the set power setting value of the unit, and when the input of the actual power input terminal of the unit is the actual power of the unit, the processor 40 is specifically configured to execute the following steps:

[0137] When the value of the flag bit indicates that the double-fed variable pumped storage unit has not entered the speed regulation dead zone, output 0; judge whether the absolute value of the first difference is greater than 0, and obtain an eighth judgment 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.

[0138] It should be noted that other details of the double-fed variable pumped storage unit provided in the embodiment of the present disclosure are the same as the embodiment of the power control method for the pumping condition of the double-fed variable pumped storage unit provided in the first aspect above, and will not be repeated here.

[0139] In a third aspect, an embodiment of the present disclosure further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method described in any one of the first aspects is implemented.

[0140] In a fourth aspect, an embodiment of the present disclosure further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program of the method described in any one of the first aspects above.

[0141] In a fifth aspect, an embodiment of the present disclosure further provides a computer program product, comprising a computer program / instructions, which, when executed by a processor, implement the steps of any one of the methods described in the first aspect above.

[0142] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented 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.

[0143] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0144] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0145] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0146] The present disclosure uses specific embodiments to illustrate the principles and implementation methods of the present disclosure. The description of the above embodiments is only used to help understand the method of the present disclosure and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present disclosure, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present disclosure.

Claims

1. A method for controlling pumping power of a double-fed variable pumped storage unit, wherein the double-fed variable pumped storage unit comprises 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 comprises: Under the pumping condition of the double-fed variable pumped storage unit, the unit power setting value, the unit actual power and the speed setting value output by the feedback controller are obtained; Determine the speed regulation state of the double-fed variable pumped storage unit according to the speed setting value, the unit power setting value and the unit actual power, wherein the speed regulation state includes entering a speed regulation dead zone or not entering a speed regulation dead zone; Determining a final speed value according to the speed regulation state of the double-fed variable pumped storage unit, the unit rated speed and / or the speed setting value; The final value of the rotational speed is sent to the AC excitation control system, wherein the AC excitation control system is used to control the rotation of the water pump based on the final value of the rotational speed.

2. The control method according to claim 1, characterized in that: Determining the speed regulation state of the double-fed variable pumped storage unit according to the speed setting value, the unit power setting value and the unit actual power includes: Calculating the difference between the set power value of the unit and the actual power of the unit to obtain a first difference; Determine whether the speed setting value is within the speed regulation dead zone to obtain a first determination result; Determine whether the first difference is greater than the opposite of a preset first value, and 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 double-fed variable pumped storage unit is determined.

3. The control method according to claim 2, characterized in that: Based on the first judgment result and the second judgment result, determining the speed regulation state of the double-fed variable pumped storage unit includes: Performing an AND operation on the first judgment result and the second judgment structure to obtain a first output result; The first output result is input into the set end of the set-reset trigger, and a signal mutually exclusive with the first output result is input into the reset end of the set-reset trigger, so as to obtain a flag output by the set-reset trigger according to the first output result and the signal mutually exclusive with the first output result, and the value of the flag indicates whether the double-fed variable pumped storage unit enters the speed regulation dead zone.

4. The control method according to claim 3, characterized in that: The step of inputting a signal mutually exclusive with the first output result into a reset terminal of the set-reset flip-flop specifically includes: Determine whether the first difference is greater than or equal to a preset second value, and whether the final speed value is greater than the rated speed, to obtain a third determination result; Determine whether the first difference is less than or equal to the opposite of a preset first value, and whether the final speed value is greater than the rated 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 speed value is less than the rated speed, to obtain a fifth determination result; Determine whether the first difference is less than or equal to the negative number of the preset second value, and whether the final speed value is less than the rated speed, to obtain a sixth determination result; Performing 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 into a reset terminal of the set-reset flip-flop.

5. The control method according to any one of claims 1 to 4, characterized in that: Determining a final speed value according to the speed regulation state of the double-fed variable pumped storage unit, the rated speed of the unit and / or the speed setting value includes: When the speed regulation state of the double-fed variable pumped storage unit is entering a speed regulation dead zone, determining whether the speed setting value is greater than the rated speed; If the speed setting value is greater than the rated speed, determining the speed final value based on the upper limit value of the speed regulation dead zone range of the double-fed variable pumped storage unit; If the speed setting value is less than or equal to the rated speed, the speed final value is determined based on the lower limit value of the speed regulation dead zone range of the double-fed variable pumped storage unit.

6. The control method according to any one of claims 1 to 4, characterized in that: Determining the final speed value according to the speed regulation state of the double-fed variable pumped storage unit, the rated speed of the unit and / or the speed setting value, further includes: When the speed regulation state of the double-fed variable pumped storage unit is not in the speed regulation dead zone, the speed setting value is used as the final speed value.

7. The control method according to claim 3, characterized in that: The method further comprises: When the speed regulation state is in the speed regulation dead zone, the inputs of the set power input terminal and the actual power input terminal of the feedback controller are both the actual power of the unit; When the speed regulation state is not in the speed regulation dead zone, the input of the set power input terminal of the feedback controller is the set power setting value of the unit, and the input of the actual power input terminal of the unit is the actual power of the unit.

8. The control method according to claim 7, characterized in that: When the speed regulation state is in the speed regulation dead zone, the inputs of the set power input terminal and the actual power input terminal of the feedback controller are both the actual power of the unit, including: When the value of the flag bit indicates that the double-fed variable pumped storage unit enters a speed regulation dead zone, outputting a preset third value; Determine whether the absolute value of the first difference is greater than the preset third value, and obtain a seventh determination result; If the seventh judgment result is no, the inputs of the set power input terminal and the set actual power input terminal of the feedback controller are both the set actual power; The preset third value is greater than the preset first value and the preset second value.

9. The control method according to claim 7, characterized in that: When the speed regulation state is not in the speed regulation dead zone, the input of the set power input terminal of the feedback controller is controlled to be the set power setting value, and the input of the set actual power input terminal is controlled to be the set actual power, including: When the value of the flag bit indicates that the double-fed variable pumped storage unit has not entered the speed regulation dead zone, output 0; Determine whether the absolute value of the first difference is greater than 0, and obtain an eighth determination result; If the eighth judgment result is yes, the input of the set power input terminal of the feedback controller is controlled to be the set power setting value, and the input of the set actual power input terminal is controlled to be the set actual power.

10. A double-fed variable pumped storage unit, characterized in that: include: A feedback controller is configured to calculate a speed setting value according to an input value of a set power input terminal of the unit and an input value of an actual power input terminal of the unit; A processor connected to the feedback controller, wherein the processor is configured to determine the speed regulation state of the doubly-fed variable pumped storage unit according to the speed setting value, the unit power setting value and the unit actual power under the pumping condition, wherein the speed regulation state includes entering the speed regulation dead zone or not entering the speed regulation dead zone; the processor is further configured to determine the final speed value according to the speed regulation state of the doubly-fed variable pumped storage unit, the unit rated speed and / or the speed setting value, and send the final speed value to the AC excitation control system; an AC excitation control system connected to the processor, wherein the AC excitation control system is configured to control the rotation of the water pump based on the final value of the rotation speed; A water pump is connected to the AC excitation control system.

11. The double-fed variable pumped storage unit according to claim 10, characterized in that: The double-fed variable pumped storage unit also includes a set-reset trigger, wherein: The processor is specifically configured to perform the following steps: Calculating the difference between the set power value of the unit and the actual power of the unit to obtain a first difference; Determine whether the speed setting value is within the speed regulation dead zone to obtain a first determination result; Determine whether the first difference is greater than the opposite of a preset first value, and the first difference is less than a preset second value, to obtain a second determination result; Performing an AND operation on the first judgment result and the second judgment structure to obtain a first output result; Inputting the first output result into a set terminal of a set-reset flip-flop, and inputting a signal mutually exclusive with the first output result into a reset terminal of the set-reset flip-flop; The set-reset trigger is configured to output a flag bit according to a first output result input to the set end of the set-reset trigger and a signal input to the reset end that is mutually exclusive with the first output result; wherein the value of the flag bit indicates whether the double-fed variable pumped storage unit enters a speed regulation dead zone.

12. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 9 is implemented.

13. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program for executing the method according to any one of claims 1 to 9.

14. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 9 are implemented.

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