Power control method, system and equipment for doubly-fed pumped storage unit

Abstract

The invention discloses a doubly-fed pumped storage unit power control method, system and device, and relates to the technical field of power system power control, and the method comprises the steps: obtaining motor operation parameters of a doubly-fed pumped storage unit, and inputting the motor operation parameters into a preset machine side control loop model; a generalized integral module is adopted to carry out integral transformation on motor operation parameters to obtain output power parameters and rotor current component parameters, and a power ring is adopted to carry out power regulation processing on the output power parameters to obtain a rotor current given reference value; and inputting the rotor current given reference value and the rotor current component parameter into a stator flux linkage control module to carry out flux linkage adjustment processing to obtain a machine side converter control instruction of the doubly-fed pumped storage group, and carrying out power adjustment on the doubly-fed pumped storage group by adopting the machine side converter control instruction. The technical problems that active power oscillation is possibly caused by non-uniform output power during multi-machine parallel connection in the existing virtual synchronous control, and the operation stability of a power system is reduced are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power system power control, and in particular to a power control method, system and equipment for a double-fed pumped storage unit. Background Art

[0002] With the introduction of the "dual carbon" strategy, the proportion of new energy such as pumped storage in the power system continues to increase, and the power system is developing towards a high proportion of renewable energy and a high proportion of power electronic equipment. Pumped storage units have become the mainstream generators for pumped storage power generation due to their high stability and high efficiency. However, with the continuous increase in the penetration rate of new energy grid connection, the intermittent and volatile output power of the power system continues to increase. If the inertial support capacity of the pumped storage unit is low, it is necessary to maintain the stability of the power system operation. Therefore, it is very important to improve the inertial support capacity of the pumped storage unit.

[0003] At present, the existing technology improves the inertial support capacity of pumped-storage units by performing virtual synchronous control on pumped-storage units. However, the damping of virtual synchronous control is weak, the inertia is large, and the coupling between the droop coefficient and the friction coefficient is strong. When multiple machines are connected in parallel, the uneven output power may cause active power oscillation, reducing the stability of the power system operation. Summary of the invention

[0004] The present invention provides a power control method, system and device for a doubly-fed pumped-storage unit, which solves the technical problem that the inertial support capacity of a pumped-storage unit is improved by virtual synchronous control of the pumped-storage unit in the prior art, but the damping of the virtual synchronous control is weak, the inertia is large, and the coupling between the droop coefficient and the friction coefficient is strong. When multiple machines are connected in parallel, the uneven output power may cause active power oscillation, thereby reducing the stability of the power system operation.

[0005] A first aspect of the present invention provides a power control method for a doubly-fed pumped storage unit, comprising:

[0006] Acquire motor operating parameters of the doubly-fed pumped storage unit, and input the motor operating parameters into a preset machine-side control loop model, wherein the machine-side control loop model includes a generalized integral module, a power loop, and a stator flux control module;

[0007] The generalized integral module is used to perform integral transformation on the motor operating parameters to obtain output power parameters and rotor current component parameters;

[0008] Performing power regulation processing on the output power parameter through the power ring to obtain a given reference value of the rotor current;

[0009] Inputting the rotor current given reference value and the rotor current component parameter into the stator flux control module for flux regulation processing to obtain a machine-side converter control instruction for the doubly-fed pumped storage unit;

[0010] The machine-side converter control instruction is used to perform power regulation on the double-fed pumped storage unit.

[0011] Optionally, the generalized integration module includes a first integrator, a second integrator and a first coordinate transformer, the motor operating parameters include a stator voltage value, a stator current value, a rotor speed and a rotor current value, and the step of using the generalized integration module to perform integral transformation on the motor operating parameters to obtain output power parameters and rotor current component parameters includes:

[0012] Inputting the stator voltage value and the stator current value into the first integrator for integration operation respectively to obtain a stator voltage component parameter and a stator current component parameter;

[0013] Using the second integrator to perform integration operation on the rotor speed to obtain a rotor position angle;

[0014] Performing coordinate transformation on the rotor current value by the first coordinate transformer to obtain rotor current component parameters;

[0015] Inputting the stator voltage component parameter and the stator current component parameter into a preset stator side output power model to obtain stator side active power and stator side reactive power;

[0016] The stator side active power, the stator side reactive power and the rotor position angle are determined as output power parameters.

[0017] Optionally, the first integrator includes a second coordinate transformation module, a generalized integrator group, a first adaptive control module, a third coordinate transformation module and a second adaptive control module, and the processing process of the first integrator is specifically as follows:

[0018] Performing coordinate transformation on the input operation parameters through the second coordinate transformation module to obtain operation component parameters;

[0019] Inputting the operating component parameter and the pre-acquired feedback frequency value into the generalized integrator group for integration operation to obtain two operating integral quantities, wherein the generalized integrator group includes two generalized integrators;

[0020] Performing frequency tracking processing on the two operating integral quantities through the first adaptive control module to obtain a first tracking component and a second tracking component;

[0021] Inputting the first tracking component and the second tracking component into the third coordinate transformation module to obtain a first component value and a second component value;

[0022] Using the second adaptive control module to perform an integration operation on the second component value to obtain a third component value, wherein the second adaptive control module includes a PI controller, a summing operation module and a second integrator connected in sequence;

[0023] The first component value, the second component value and the third component value are adopted as output component parameters.

[0024] Optionally, the power loop includes an active loop and a reactive loop, and the step of performing power regulation processing on the output power parameter through the power loop to obtain a given reference value of the rotor current includes:

[0025] The stator side active power, the rotor position angle and a preset active power given value are input into the active loop for integration operation to obtain the rotor current position angle;

[0026] Inputting the stator side reactive power and the preset reactive power given value into the reactive loop for integration operation to obtain a rotor current reference amplitude;

[0027] The rotor current position angle and the rotor current reference amplitude are used as rotor current given reference values.

[0028] Optionally, the stator flux control module includes a fourth coordinate transformation module, a fifth coordinate transformation module, a flux oriented control module, a virtual reactance module and an SPWM modulator, and the step of inputting the rotor current given reference value and the rotor current component parameter into the stator flux control module for flux regulation processing to obtain the machine-side converter control instruction of the doubly-fed pumped storage unit includes:

[0029] Inputting the rotor current given reference value into the fourth coordinate transformation module for coordinate transformation to obtain rotor three-phase current reference parameters;

[0030] Performing coordinate transformation on the rotor three-phase current reference parameter by the fifth coordinate transformation module to obtain rotor reference current component parameters;

[0031] Inputting the rotor reference current component parameter and the rotor current component parameter into the flux linkage orientation control module for flux linkage orientation adjustment processing to obtain a rotor reference voltage parameter, wherein the flux linkage orientation control module includes a first orientation module, a second orientation module and a sixth coordinate transformation module;

[0032] Inputting the rotor reference voltage parameter into the virtual reactance module for reactance regulation processing to obtain a regulation voltage parameter;

[0033] The SPWM modulator performs modulation conversion processing on the regulating voltage parameter to obtain a control instruction for the machine-side converter of the double-fed pumped storage unit.

[0034] Optionally, the rotor reference current component parameter includes a first rotor reference current component and a second rotor reference current component, the rotor current component parameter includes a first rotor current component and a second rotor current component, and the step of inputting the rotor reference current component parameter and the rotor current component parameter into the flux oriented control module for flux oriented adjustment processing to obtain the rotor reference voltage parameter includes:

[0035] Inputting the first rotor reference current component, the first rotor current component and the pre-acquired first rotor voltage component into the first directional module to obtain a first directional voltage value, wherein the first directional module includes a difference module, a PI controller and a summing module connected in sequence;

[0036] Inputting the second rotor parameter current component, the second rotor current component and the pre-acquired second rotor voltage component into the second directional module to obtain a second directional voltage value, wherein the second directional voltage value includes a difference module, a PI controller and a difference module connected in sequence;

[0037] The first directional voltage value and the second directional voltage value are subjected to coordinate transformation by the sixth coordinate transformation module to obtain a rotor reference voltage parameter.

[0038] Optionally, the step of inputting the first rotor reference current component, the first rotor current component and the pre-acquired first rotor voltage component into the first directional module to obtain a first directional voltage value includes:

[0039] Using a difference module to perform difference processing on the first rotor reference current component and the first rotor current component to obtain a first difference;

[0040] Inputting the first difference into a PI controller for voltage regulation to obtain a first intermediate voltage value;

[0041] The first intermediate voltage value and the pre-acquired first rotor voltage component are added together by an adding module to obtain a first directional voltage value.

[0042] Optionally, the step of inputting the second rotor parameter current component, the second rotor current component and the pre-acquired second rotor voltage component into the second directional module to obtain a second directional voltage value includes:

[0043] Using a difference module to perform difference processing on the second rotor parameter current component and the second rotor current component to obtain a second difference;

[0044] Inputting the second difference into a PI controller for voltage regulation to obtain a second intermediate voltage value;

[0045] The second intermediate voltage value and the pre-acquired second rotor voltage component are subjected to difference processing by a difference module to obtain a second directional voltage value.

[0046] The second invention of the present invention provides a double-fed pumped storage unit power control system, comprising:

[0047] An acquisition module, used for acquiring motor operating parameters of a doubly-fed pumped storage unit, and inputting the motor operating parameters into a preset machine-side control loop model, wherein the machine-side control loop model includes a generalized integral module, a power loop, and a stator flux control module;

[0048] An integration module, used for performing an integration transformation on the motor operation parameters by using the generalized integration module to obtain output power parameters and rotor current component parameters;

[0049] A power regulation module, used for performing power regulation processing on the output power parameter through the power ring to obtain a given reference value of the rotor current;

[0050] A flux regulation module, used for inputting the rotor current given reference value and the rotor current component parameter into the stator flux control module for flux regulation processing, so as to obtain a machine-side converter control instruction of the doubly-fed pumped storage unit;

[0051] An execution module is used to use the machine-side converter control instruction to perform power regulation on the double-fed pumped storage unit.

[0052] A third aspect of the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the power control method of a doubly-fed pumped storage unit as described in any one of the above items.

[0053] It can be seen from the above technical solutions that the present invention has the following advantages:

[0054] The present invention obtains the motor operating parameters of the doubly-fed pumped storage unit and uses a generalized integral module to perform integral transformation on the motor operating parameters to obtain output power parameters and rotor current component parameters. The generalized integral module has the ability to track the frequency changes of the adaptive system, so that more accurate output power parameters and rotor current component parameters can be extracted from the motor operating parameters. The output power parameters and rotor current component parameters are adaptively controlled in combination with the power loop and the stator flux control module to obtain the machine-side converter control instructions of the doubly-fed pumped storage unit. The prior art overcomes the technical problem that the inertial support capacity of the pumped storage unit is improved by virtual synchronous control of the pumped storage unit, but the virtual synchronous control has weak damping, large inertia, and strong coupling between the droop coefficient and the friction coefficient. When multiple machines are connected in parallel, the uneven output power may cause active power oscillation, thereby reducing the stability of the power system operation. Compared with traditional virtual synchronous control, the present invention increases reactive power and active power in the control process through the power loop to provide inertial support, and combines the stator flux control module to improve the damping of the doubly fed pumped storage unit, reduce power oscillation on the output side, and improve the stability of power system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0056] Figure 1 A flowchart of the steps of a power control method for a double-fed pumped storage unit provided in Embodiment 1 of the present invention;

[0057] Figure 2 A schematic diagram of the structure of a machine-side control loop model provided in Embodiment 1 of the present invention;

[0058] Figure 3 A flowchart of a method for controlling power of a double-fed pumped storage unit provided in Embodiment 2 of the present invention;

[0059] Figure 4 A schematic diagram of the structure of a first integration module provided in Embodiment 2 of the present invention;

[0060] Figure 5 A schematic diagram of the structure of a generalized integrator provided in Embodiment 2 of the present invention;

[0061] Figure 6 A schematic diagram of a frequency tracking SOGI-PLL control loop provided in Embodiment 2 of the present invention;

[0062] Figure 7 A schematic diagram of active loop control provided in Embodiment 2 of the present invention;

[0063] Figure 8 A schematic diagram of reactive loop control provided in Embodiment 2 of the present invention;

[0064] Fig. 9 A schematic diagram of the structure of a double-fed pumped storage unit power control system provided in Embodiment 3 of the present invention;

[0065] Fig.10 This is a structural block diagram of a computer device provided in Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0066] The embodiments of the present invention provide a power control method, system and device for a doubly-fed pumped-storage unit, which are used to solve the technical problem that the inertial support capacity of a pumped-storage unit is improved by virtual synchronous control of the pumped-storage unit in the prior art, but the damping of the virtual synchronous control is weak, the inertia is large, and the coupling between the droop coefficient and the friction coefficient is strong. When multiple machines are connected in parallel, the active power may oscillate due to uneven output power, thereby reducing the stability of the power system operation.

[0067] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] See also Figure 1 , Figure 1 A flowchart of the steps of a power control method for a doubly-fed pumped storage unit provided in Embodiment 1 of the present invention.

[0069] The present invention provides a double-fed pumped storage unit power control method, comprising:

[0070] Step 101, obtaining motor operating parameters of a doubly-fed pumped storage unit, and inputting the motor operating parameters into a preset machine-side control loop model, wherein the machine-side control loop model includes a generalized integral module, a power loop, and a stator flux control module;

[0071] The motor operating parameters refer to the operating parameters of the doubly-fed induction motor in the doubly-fed pumped storage unit, wherein the operating parameters include but are not limited to stator voltage value, stator current value, rotor speed and rotor current value.

[0072] In an embodiment of the present invention, the motor operating parameters of the doubly-fed pumped storage unit are collected by a preset sampling processing unit, and the motor operating parameters are input into a preset machine-side control loop model, wherein the machine-side control loop model includes a generalized integral module, a power loop and a stator flux control module.

[0073] Step 102: using a generalized integral module to perform integral transformation on the motor operating parameters to obtain output power parameters and rotor current component parameters;

[0074] The rotor current component parameters refer to the rotor current component and rotor position angle of the doubly-fed pumped storage unit.

[0075] In the embodiment of the present invention, refer to Figure 2 As shown, a generalized integration module is used to perform integration transformation on the motor operating parameters to obtain output power parameters and rotor current component parameters. The generalized integration module includes a first integrator (i.e., an improved SOGI-PLL module), a second integrator (i.e., an integrator connected to the Hall sensor) and a first coordinate converter (i.e., an abc-dq converter).

[0076] Step 103: Perform power regulation processing on the output power parameter through the power loop to obtain a given reference value of the rotor current;

[0077] The output power parameter refers to the stator side active power and stator side reactive power of the doubly-fed pumped storage unit.

[0078] In the embodiment of the present invention, refer to Figure 2 As shown, the power ring includes an active ring and a reactive ring. The active power on the stator side is regulated by the active ring to obtain a first power regulation value. The reactive power on the stator side is regulated by the reactive ring to obtain a second power regulation value. The first power regulation value and the second power regulation value are used as given reference values ​​for the rotor current.

[0079] Step 104: input the rotor current given reference value and the rotor current component parameter into the stator flux control module for flux regulation processing to obtain a machine-side converter control instruction of the doubly-fed pumped storage unit;

[0080] In the embodiment of the present invention, refer to Figure 2 As shown, the rotor current given reference value, rotor current component parameters and pre-acquired rotor voltage components are input into the stator flux control module for flux regulation processing to obtain the machine-side converter control instructions of the double-fed pumped storage unit. Among them, the stator flux control module includes a fourth coordinate transformation module, a fifth coordinate transformation module, a flux directional control module, a virtual reactance module and an SPWM modulator.

[0081] Step 105: Use the machine-side converter control instruction to perform power regulation on the doubly-fed pumped storage unit.

[0082] In an embodiment of the present invention, the machine-side converter control instruction is sent down to the machine-side converter of the doubly-fed pumped storage unit, so that the machine-side converter responds to and executes the machine-side converter control instruction, thereby adjusting the doubly-fed induction motor connected to the machine-side converter.

[0083] In an embodiment of the present invention, the present invention obtains the motor operating parameters of the doubly-fed pumped storage unit, and uses a generalized integral module to perform integral transformation on the motor operating parameters to obtain output power parameters and rotor current component parameters. The generalized integral module has the ability to track the frequency change of the adaptive system, so that more accurate output power parameters and rotor current component parameters can be extracted from the motor operating parameters. Then, the power loop and the stator flux control module are combined to perform adaptive control on the output power parameters and rotor current component parameters, and the machine-side converter control instructions of the doubly-fed pumped storage unit can be obtained. The prior art overcomes the problem that the inertial support capacity of the pumped storage unit is improved by virtual synchronous control of the pumped storage unit, but the virtual synchronous control has weak damping, large inertia, and strong coupling between the droop coefficient and the friction coefficient. When multiple machines are connected in parallel, the uneven output power may cause active power oscillation, thereby reducing the stability of the power system operation. Compared with traditional virtual synchronous control, the present invention increases reactive power and active power in the control process through the power loop to provide inertial support, and combines the stator flux control module to improve the damping of the doubly fed pumped storage unit, reduce power oscillation on the output side, and improve the stability of power system operation.

[0084] See also Figure 3 , Figure 3 A flowchart of the steps of a power control method for a doubly-fed pumped storage unit provided in Embodiment 2 of the present invention.

[0085] The present invention provides a double-fed pumped storage unit power control method, comprising:

[0086] Step 201, obtaining motor operating parameters of a doubly-fed pumped storage unit, and inputting the motor operating parameters into a preset machine-side control loop model, wherein the machine-side control loop model includes a generalized integral module, a power loop, and a stator flux control module, and the stator flux control module includes a fourth coordinate transformation module, a fifth coordinate transformation module, a flux directional control module, a virtual reactance module, and an SPWM modulator;

[0087] In an embodiment of the present invention, the motor operating parameters of the doubly-fed pumped storage unit are obtained by a sampling processing unit installed on the doubly-fed pumped storage unit, and the motor operating parameters are input into a preset machine-side control loop module. The machine-side control loop model includes a generalized integral module, a power loop, and a stator flux control module.

[0088] Step 202: using a generalized integral module to perform integral transformation on the motor operating parameters to obtain output power parameters and rotor current component parameters;

[0089] Further, the generalized integration module includes a first integrator, a second integrator and a first coordinate transformer, the motor operation parameters include a stator voltage value, a stator current value, a rotor speed and a rotor current value, and step 202 includes the following sub-steps:

[0090] S11, inputting the stator voltage value and the stator current value into the first integrator for integration operation respectively, to obtain the stator voltage component parameter and the stator current component parameter;

[0091] The stator voltage component parameter refers to the dq-axis component of the stator voltage value.

[0092] The stator current component parameter refers to the dq-axis component of the stator current value.

[0093] In the embodiment of the present invention, the stator voltage value and the stator current value are respectively input into the first integrator (ie, the improved SOGI-PLL) for integration operation to obtain the stator voltage component parameter and the stator current component parameter.

[0094] It is worth mentioning that see Figure 6 As shown, when the input signal frequency is not equal to the system resonant frequency, there will be a tracking error in the system output. At this time, the output frequency of the first integrator can be used as the resonant frequency of the second-order generalized integral. This can further improve the first integrator so that the system has the ability to adaptively track system frequency changes.

[0095] It should be noted that the first integrator includes a second coordinate transformation module, a generalized integrator group, a first adaptive control module, a third coordinate transformation module and a second adaptive control module. The processing process of the first integrator is specifically as follows:

[0096] A1. Performing coordinate transformation on the input operation parameters through the second coordinate transformation module to obtain operation component parameters;

[0097] In the embodiment of the present invention, refer to Figure 4As shown, the second coordinate transformation module performs coordinate transformation on the input operation parameters to obtain operation component parameters. For example, when the stator voltage value is input, the second coordinate transformation module outputs the stator voltage operation component parameter. When the stator current value is input, the second coordinate transformation module outputs the stator current operation component parameter.

[0098] A2. Inputting the operating component parameter and the feedback frequency value obtained in advance into the generalized integrator group for integration operation to obtain two operating integral quantities, wherein the generalized integrator group includes two generalized integrators;

[0099] In the embodiment of the present invention, refer to Figure 4 As shown, the operating component parameters include a first component signal and a second component signal. The first component signal and the second component signal are respectively input into corresponding generalized integrators (improved SOGI devices), and the pre-acquired feedback frequency value is simultaneously input into the generalized integrator for integration operation to obtain two operating integral quantities.

[0100] It should be noted that the feedback frequency value obtained in advance is the running integral amount output by the generalized integrator at the previous moment.

[0101] It should be noted that, see Figure 5 As shown, the transfer function of the generalized integrator can be expressed as:

[0102]

[0103]

[0104] in, is a complex variable, is the closed gain, is the first integrated signal, is the second integrated signal, is the input component signal amplitude, is the first integrated signal amplitude, is the second integrated signal amplitude, To track the corresponding frequency without static error, is the first transfer function value, is the value of the second transfer function.

[0105] From this, the amplitude-frequency and phase-frequency characteristics of the generalized integrator can be calculated as:

[0106]

[0107]

[0108] in, is the amplitude-frequency characteristic value, is the phase-frequency characteristic value, is the signal frequency.

[0109] A3, performing frequency tracking processing on the two operating integral quantities through the first adaptive control module to obtain a first tracking component and a second tracking component;

[0110] In the embodiment of the present invention, refer to Figure 4 As shown, the first adaptive control module performs frequency tracking processing on the two operating integrals to obtain the first tracking component and the second tracking component. The specific processing process of the first adaptive control module is as follows: select any one operating component as the first transition component (the first transition component includes the first transition signal and the second transition signal), and the remaining operating components as the second transition component (the second transition component includes the third transition signal and the fourth transition signal), perform difference processing on the first transition signal and the fourth transition signal to obtain the first transition difference, and perform multiplication processing on the first transition difference and the preset gain coefficient (the gain coefficient is 0.5) to obtain the first tracking component. The second transition signal and the third transition signal are added to obtain the first transition sum, and the first transition sum is multiplied by the preset gain coefficient to obtain the second tracking component.

[0111] A4, inputting the first tracking component and the second tracking component into a third coordinate transformation module to obtain a first component value and a second component value;

[0112] A5. Performing an integration operation on the second component value using a second adaptive control module to obtain a third component value, wherein the second adaptive control module includes a PI controller, a summing operation module and a second integrator connected in sequence;

[0113] A6. Use the first component value, the second component value and the third component value as output component parameters.

[0114] In the embodiment of the present invention, refer to Figure 4 As shown, the first tracking component and the second tracking component are input into the third coordinate transformation module to obtain the first component value and the second component value. The second component value is input into the second adaptive control module which is connected by the PI controller, the summing operation module and the second integrator in sequence to obtain the third component value. The first component value, the second component value and the third component value are used as the output component parameters.

[0115] S12, using a second integrator to perform an integration operation on the rotor speed to obtain a rotor position angle;

[0116] In the embodiment of the present invention, refer to Figure 2 As shown, the rotor speed is input into the second integrator (i.e. 1 / s) to obtain the rotor position angle.

[0117] S13, performing coordinate transformation on the rotor current value by a first coordinate transformer to obtain rotor current component parameters;

[0118] In the embodiment of the present invention, a first coordinate transformer is used to perform coordinate transformation on the rotor current value to obtain rotor current component parameters.

[0119] S14, inputting the stator voltage component parameter and the stator current component parameter into a preset stator side output power model to obtain the stator side active power and the stator side reactive power;

[0120] In the embodiment of the present invention, the stator voltage component parameter and the stator current component parameter are used as inputs of a preset stator side output power model to obtain the stator side active power and the stator side reactive power.

[0121] It should be noted that the stator side output power model is specifically:

[0122]

[0123] in, is the active power on the stator side, is the stator side reactive power, is the d-axis component of the stator voltage, is the d-axis component of the stator current, is the q-axis component of the stator voltage, is the q-axis component of the stator current.

[0124] S15. Determine the stator side active power, the stator side reactive power and the rotor position angle as output power parameters.

[0125] In the embodiment of the present invention, the stator side active power, the stator side reactive power and the rotor position angle are used to determine the output power parameters.

[0126] Step 203: Perform power regulation processing on the output power parameter through the power loop to obtain a given reference value of the rotor current;

[0127] Further, the power loop includes an active loop and a reactive loop, and step 203 includes the following sub-steps:

[0128] S21, inputting the stator side active power, the rotor position angle and the preset active power given value into the active loop for integration operation to obtain the rotor current position angle;

[0129] In the embodiment of the present invention, refer to Figure 7 As shown, the output stator side angular frequency, stator side active power and preset active power given value are input into the active loop for integration operation to obtain the stator angle, and then the stator angle and the rotor position angle are difference processed to obtain the rotor current position angle.

[0130] S22, inputting the stator side reactive power and the preset reactive power set value into the reactive loop for integration operation to obtain the rotor current reference amplitude;

[0131] S23, using the rotor current position angle and the rotor current reference amplitude as the rotor current given reference value.

[0132] In the embodiment of the present invention, refer to Figure 8 As shown, the reactive loop will be controlled by the reference value of the stator voltage amplitude The actual amplitude measured with the stator voltage After subtraction, the droop coefficient After that, the reactive power compensation value is obtained, and the reactive power compensation value is added to the reactive power given value to obtain the reactive sum value, and the reactive sum value is processed by difference with the reactive power on the stator side and adjusted by the PI controller to obtain the rotor current reference amplitude. The rotor current position angle and the rotor current reference amplitude are used as the rotor current given reference value.

[0133] Step 204: input the given reference value of the rotor current into the fourth coordinate transformation module for coordinate transformation to obtain a rotor three-phase current reference parameter;

[0134] In the embodiment of the present invention, the fourth coordinate transformation module performs coordinate transformation on the given reference value of the rotor current to obtain the rotor three-phase current reference parameter.

[0135] It should be noted that the specific conversion process of performing coordinate transformation on the given reference value of the rotor current through the fourth coordinate transformation module is:

[0136]

[0137] in, is the rotor current reference amplitude, is the rotor current position angle, is the rotor a phase current reference value, is the rotor b phase current reference value, is the rotor c phase current reference value.

[0138] Step 205: performing coordinate transformation on the rotor three-phase current reference parameter by a fifth coordinate transformation module to obtain rotor reference current component parameters;

[0139] In the embodiment of the present invention, a fifth coordinate transformation module is used to perform coordinate transformation on the rotor three-phase current reference parameter to obtain the rotor reference current component parameter.

[0140] Step 206: Input the rotor reference current component parameter and the rotor current component parameter into the flux orientation control module for flux orientation adjustment processing to obtain the rotor reference voltage parameter, wherein the flux orientation control module includes a first orientation module, a second orientation module and a sixth coordinate transformation module;

[0141] Further, the rotor reference current component parameter includes a first rotor reference current component and a second rotor reference current component, and the rotor current component parameter includes a first rotor current component and a second rotor current component. Step 206 includes the following sub-steps:

[0142] S31, inputting the first rotor reference current component, the first rotor current component and the pre-acquired first rotor voltage component into a first directional module to obtain a first directional voltage value, wherein the first directional module includes a difference module, a PI controller and a summing module connected in sequence;

[0143] It is worth mentioning that the control process of the stator flux control module orients the stator flux on the d-axis, which can reduce the impact of grid voltage fluctuations on the excitation system. After the coordinate transformation of the stator and rotor voltages and flux, the mathematical model of the doubly fed induction motor in the two-phase rotating coordinate system can be described as:

[0144] The voltage equation in the two-phase rotating coordinate system is:

[0145]

[0146] in, is the rotor resistance, is the d-axis component of the rotor voltage, is the q-axis component of the rotor voltage, is the d-axis component of the rotor current, is the q-axis component of the rotor current, is the stator resistance, is the d-axis component of the stator voltage, is the q-axis component of the stator voltage, is the d-axis component of the stator current, is the q-axis component of the stator current, is the d-axis component of the stator flux, is the q-axis component of the stator flux, is the grid frequency, is the slip frequency.

[0147] The flux equation in the two-phase rotating coordinate system is:

[0148]

[0149] in, is the component of the rotor flux on the d-axis, is the component of the rotor flux on the q axis, is the component of the stator flux on the d-axis, is the component of the stator flux on the q axis, is the mutual inductance between the corresponding equivalent windings of the stator and rotor, is the self-inductance of the equivalent winding of the rotor in the dq coordinate system, is the self-inductance of the equivalent winding of the stator in the dq coordinate system.

[0150] Under the stator flux oriented control mode of the stator flux control module, the dq axis components of the stator flux are:

[0151]

[0152] At this time, the relationship between the stator and rotor currents can be expressed as:

[0153]

[0154] From the knowledge of electrical machinery, we know that the AC excitation phase voltage leads the flux by 90 degrees, so the stator voltage can be controlled in the positive direction of the q axis through the machine-side converter. Since the resistance is very low compared to the reactance in the doubly fed induction motor, the influence of the resistance is ignored, and it can be concluded that:

[0155]

[0156] From this, the expression of rotor flux can be obtained as:

[0157]

[0158] in, is the leakage reactance of the doubly-fed induction motor, .

[0159] According to the above formula, the relationship between rotor current and voltage can be derived as follows:

[0160]

[0161] According to the above formula, when a voltage source converter is used on the machine side of the excitation system to control the rotor current of the doubly fed machine, it is necessary to obtain the reference voltage of the PWM output of the voltage source converter by calculating the rotor voltage equation, and then set the PI regulator to dynamically control the rotor current.

[0162] Further, S31 includes the following sub-steps:

[0163] S311, using a difference module to perform difference processing on the first rotor reference current component and the first rotor current component to obtain a first difference;

[0164] In an embodiment of the present invention, a first difference between the first rotor reference current component and the first rotor current component is calculated by a difference module.

[0165] S312, inputting the first difference into a PI controller for voltage regulation to obtain a first intermediate voltage value;

[0166] In the embodiment of the present invention, the first difference is input into a PI controller for adjustment to obtain a first intermediate voltage value.

[0167] S313, adding the first intermediate voltage value and the pre-acquired first rotor voltage component through an adding module to obtain a first directional voltage value.

[0168] In the embodiment of the present invention, the first intermediate voltage value and the pre-acquired first rotor voltage component are input to the summing module for summing processing to obtain the first directional voltage value.

[0169] S32, inputting the second rotor parameter current component, the second rotor current component and the pre-acquired second rotor voltage component into the second directional module to obtain a second directional voltage value, wherein the second directional voltage value includes a difference module, a PI controller and a difference module connected in sequence;

[0170] Further, S32 includes the following sub-steps:

[0171] S321, using a difference module to perform difference processing on the second rotor parameter current component and the second rotor current component to obtain a second difference;

[0172] In the embodiment of the present invention, the second rotor parameter current component and the second rotor current component are input into a difference module for difference processing to obtain a second difference.

[0173] S322, inputting the second difference into a PI controller for voltage regulation to obtain a second intermediate voltage value;

[0174] In the embodiment of the present invention, the second difference is adjusted by a PI controller to output a second intermediate voltage value.

[0175] S323, performing difference processing on the second intermediate voltage value and the pre-acquired second rotor voltage component through a difference module to obtain a second directional voltage value.

[0176] In the embodiment of the present invention, the second intermediate voltage value and the pre-acquired second rotor voltage component are input to a difference module for difference processing to obtain a second directional voltage value.

[0177] It should be noted that the expressions of the first rotor voltage component and the second rotor voltage component (that is, the first rotor voltage component and the second rotor voltage component are feedforward supplementary phases for overcoming the influence of the disturbance term in the rotor voltage equation on the rotor current control) obtained in advance are:

[0178]

[0179] in, is the first rotor voltage component, is the second rotor voltage component, is the leakage reactance of the doubly-fed induction motor, is the equivalent winding self-inductance of the rotor in the dq coordinate system, is the self-inductance of the equivalent winding of the stator in the dq coordinate system, is the mutual inductance between the corresponding equivalent windings of the stator and rotor, is the slip frequency, is the q-axis component of the rotor current, is the d-axis component of the rotor current, is the grid frequency.

[0180] S33, performing coordinate transformation on the first directional voltage value and the second directional voltage value through a sixth coordinate transformation module to obtain a rotor reference voltage parameter.

[0181] In the embodiment of the present invention, a sixth coordinate transformation module is used to perform coordinate transformation on the first directional voltage value and the second directional voltage value to obtain a rotor reference voltage parameter.

[0182] Step 207, inputting the rotor reference voltage parameter into the virtual reactance module for reactance regulation processing to obtain a regulation voltage parameter;

[0183] In the embodiment of the present invention, the rotor reference voltage parameter is input into the virtual reactance module to perform virtual synchronous control processing to obtain the adjustment voltage parameter.

[0184] It should be noted that the virtual reactance module simulates the external characteristics of the synchronous generator, so that the power electronic devices have similar frequency and voltage regulation characteristics as the synchronous generator, and have good frequency and voltage support capabilities. By combining it with the stator flux directional control of the traditional excitation system, the double-fed pumped storage unit has certain frequency and voltage regulation characteristics. Based on the typical model of the synchronous generator, the mathematical model of the active-frequency control loop of the virtual reactance module can be obtained:

[0185] The mathematical model of the active power-frequency control loop is as follows:

[0186]

[0187] in, is the moment of inertia, is the damping coefficient, is the mechanical torque, is the electromagnetic torque, is the mechanical angular velocity, is the rated angular velocity.

[0188] It is worth mentioning that the virtual reactance module uses the frequency deviation as the input of the virtual speed regulator in the virtual synchronous active power control loop, and Then the output of mechanical power reference is obtained, the specific expression is:

[0189]

[0190] in, Output quantity referenced to mechanical power.

[0191] It is worth mentioning that the oscillation of active power is caused by the unequal instantaneous power increment. For the case of multiple excitation systems in parallel, when the line reactance ratio between the excitation systems is and the moment of inertia in each control When the ratio of is equal, it is approximately 1, which can significantly reduce the power oscillation of the excitation system. However, it is unrealistic and uneconomical to change the line reactance in the actual pumped storage unit. Therefore, the virtual reactance module is used to simulate the reactance value required in the actual line to suppress the oscillation of active power. The specific virtual reactance algorithm is:

[0192]

[0193]

[0194] in, The first voltage reference for the initial output based on stator flux control on the machine side, The second voltage reference is initially output based on the stator flux control of the machine side. The third voltage reference is initially output based on the stator flux control on the machine side. is the first straight-axis voltage component in the stationary coordinate system, is the second direct-axis voltage component in the stationary coordinate system, is the rotor a-phase current value of the doubly-fed induction motor, is the b-phase current value of the doubly-fed induction motor rotor, is the c-phase current value of the doubly-fed induction motor rotor, is the first straight-axis current component in the stationary coordinate system, is the second direct-axis current component in the stationary coordinate system, is the actual output voltage reference of phase a, is the actual output voltage reference of phase b, is the actual output voltage reference of phase C. Therefore, by adjusting the virtual reactance value of each parallel excitation system, the reactance ratio and the moment of inertia ratio of different excitation systems can be made equal, thereby achieving an average distribution of the forward power and effectively suppressing the oscillation of the active power.

[0195] Step 208: Modulate and convert the regulated voltage parameters through the SPWM modulator to obtain a machine-side converter control instruction for the doubly-fed pumped storage unit.

[0196] In the embodiment of the present invention, an SPWM modulator is used to perform modulation conversion processing on the regulating voltage parameter to obtain a machine-side converter control instruction of the double-fed pumped storage unit.

[0197] Step 209: Use the machine-side converter control instruction to perform power regulation on the double-fed pumped storage unit.

[0198] In the embodiment of the present invention, the doubly-fed pumped storage unit is controlled to output power according to the control instruction of the machine-side converter.

[0199] It is worth mentioning that the double-fed pumped storage unit can suppress power oscillation by adding a low-frequency oscillation component extraction unit and a virtual damping unit. The specific working principle is: by setting a reasonable cutoff frequency (The period is ), the frequency oscillation component is obtained through the DC isolation filter, and the DC component is filtered out, so that the output signal can obtain the frequency oscillation component without DC component. Finally, the low-frequency oscillation component is multiplied by the damping coefficient , and use it as a negative feedback signal of the electromagnetic torque to add additional damping to the original electromagnetic torque, thereby accelerating the attenuation of power oscillation.

[0200] The expression of cut-off frequency is:

[0201]

[0202] in, is the filter input angular velocity, is the output angular velocity of the filter.

[0203] In an embodiment of the present invention, the present invention obtains the motor operating parameters of the doubly-fed pumped storage unit, and uses a generalized integral module to perform integral transformation on the motor operating parameters to obtain output power parameters and rotor current component parameters. The generalized integral module has the ability to track the frequency change of the adaptive system, so that more accurate output power parameters and rotor current component parameters can be extracted from the motor operating parameters. Then, the power loop and the stator flux control module are combined to perform adaptive control on the output power parameters and rotor current component parameters, and the machine-side converter control instructions of the doubly-fed pumped storage unit can be obtained. The prior art overcomes the problem that the inertial support capacity of the pumped storage unit is improved by virtual synchronous control of the pumped storage unit, but the virtual synchronous control has weak damping, large inertia, and strong coupling between the droop coefficient and the friction coefficient. When multiple machines are connected in parallel, the uneven output power may cause active power oscillation, thereby reducing the stability of the power system operation. Compared with traditional virtual synchronous control, the present invention increases reactive power and active power in the control process through the power loop to provide inertial support, and combines the stator flux control module to improve the damping of the doubly fed pumped storage unit, reduce power oscillation on the output side, and improve the stability of power system operation.

[0204] See also Fig. 9 , Fig. 9 This is a structural block diagram of a doubly-fed pumped storage unit power control system provided in Embodiment 3 of the present invention.

[0205] The present invention provides a double-fed pumped storage unit power control system, comprising:

[0206] The acquisition module 301 is used to obtain the motor operating parameters of the double-fed pumped storage unit and input the motor operating parameters into a preset machine-side control loop model, wherein the machine-side control loop model includes a generalized integral module, a power loop and a stator flux control module;

[0207] An integration module 302 is used to perform an integration transformation on the motor operation parameters using a generalized integration module to obtain output power parameters and rotor current component parameters;

[0208] The power regulation module 303 is used to perform power regulation processing on the output power parameter through the power loop to obtain a given reference value of the rotor current;

[0209] The flux regulation module 304 is used to input the rotor current given reference value and the rotor current component parameters into the stator flux control module for flux regulation processing to obtain the machine-side converter control instruction of the doubly-fed pumped storage unit;

[0210] The execution module 305 is used to adjust the power of the double-fed pumped storage unit by using the machine-side converter control instruction.

[0211] Further, the generalized integration module includes a first integrator, a second integrator and a first coordinate transformer, the motor operation parameters include a stator voltage value, a stator current value, a rotor speed and a rotor current value, and the integration module 302 includes:

[0212] A first analysis submodule, used for inputting the stator voltage value and the stator current value into a first integrator for integration operation to obtain a stator voltage component parameter and a stator current component parameter;

[0213] The second integrator is used to perform integration operation on the rotor speed to obtain the rotor position angle;

[0214] A first transformation submodule, used for performing coordinate transformation on the rotor current value through a first coordinate transformer to obtain rotor current component parameters;

[0215] The second analysis submodule is used to input the stator voltage component parameters and the stator current component parameters into a preset stator side output power model to obtain the stator side active power and the stator side reactive power;

[0216] The stator side active power, the stator side reactive power and the rotor position angle are determined as output power parameters.

[0217] Furthermore, the first integrator includes a second coordinate transformation module, a generalized integrator group, a first adaptive control module, a third coordinate transformation module and a second adaptive control module. The processing process of the first integrator is specifically as follows:

[0218] The input operation parameters are coordinate transformed by a second coordinate transformation module to obtain operation component parameters;

[0219] Inputting the operating component parameter and the pre-acquired feedback frequency value into the generalized integrator group for integration operation to obtain two operating integral quantities, wherein the generalized integrator group includes two generalized integrators;

[0220] Performing frequency tracking processing on the two operating integral quantities through a first adaptive control module to obtain a first tracking component and a second tracking component;

[0221] Inputting the first tracking component and the second tracking component into a third coordinate transformation module to obtain a first component value and a second component value;

[0222] Using a second adaptive control module to perform an integration operation on the second component value to obtain a third component value, wherein the second adaptive control module includes a PI controller, a summing operation module and a second integrator connected in sequence;

[0223] The first component value, the second component value and the third component value are used as component parameters of the output.

[0224] Furthermore, the power loop includes an active loop and a reactive loop, and the power regulation module 303 includes:

[0225] The first power regulation submodule is used to input the stator side active power, the rotor position angle and the preset active power given value into the active loop for integration operation to obtain the rotor current position angle;

[0226] The second power regulation submodule is used to input the stator side reactive power and the preset reactive power set value into the reactive loop for integration operation to obtain the rotor current reference amplitude;

[0227] The rotor current position angle and the rotor current reference amplitude are used as the rotor current given reference values.

[0228] Further, the stator flux control module includes a fourth coordinate transformation module, a fifth coordinate transformation module, a flux orientation control module, a virtual reactance module and an SPWM modulator, and the flux regulation module 304 includes:

[0229] A second transformation submodule is used to input the given reference value of the rotor current into the fourth coordinate transformation module for coordinate transformation to obtain a rotor three-phase current reference parameter;

[0230] A third transformation submodule, configured to perform coordinate transformation on the rotor three-phase current reference parameter through a fifth coordinate transformation module to obtain a rotor reference current component parameter;

[0231] A first flux submodule, used for inputting the rotor reference current component parameter and the rotor current component parameter into the flux directional control module for flux directional adjustment processing to obtain the rotor reference voltage parameter, wherein the flux directional control module includes a first directional module, a second directional module and a sixth coordinate transformation module;

[0232] The signal generation submodule is used to input the rotor reference voltage parameter into the virtual reactance module for reactance regulation processing to obtain the regulated voltage parameter;

[0233] The SPWM modulator is used to modulate and convert the regulated voltage parameters to obtain the control instructions of the machine-side converter of the doubly-fed pumped storage unit.

[0234] Further, the rotor reference current component parameter includes a first rotor reference current component and a second rotor reference current component, the rotor current component parameter includes a first rotor current component and a second rotor current component, and the first flux linkage submodule includes:

[0235] A first directional unit, used for inputting a first rotor reference current component, a first rotor current component and a pre-acquired first rotor voltage component into a first directional module to obtain a first directional voltage value, wherein the first directional module comprises a difference module, a PI controller and a summing module connected in sequence;

[0236] A second directional unit, used for inputting a second rotor parameter current component, a second rotor current component and a pre-acquired second rotor voltage component into a second directional module to obtain a second directional voltage value, wherein the second directional voltage value includes a difference module, a PI controller and a difference module connected in sequence;

[0237] The first transformation unit is used to perform coordinate transformation on the first directional voltage value and the second directional voltage value through a sixth coordinate transformation module to obtain a rotor reference voltage parameter.

[0238] Furthermore, the first orientation unit comprises:

[0239] A first analysis subunit, configured to perform difference processing on the first rotor reference current component and the first rotor current component using a difference module to obtain a first difference;

[0240] A second analysis subunit is used to input the first difference into a PI controller for voltage regulation to obtain a first intermediate voltage value;

[0241] The third analysis subunit is used to perform sum processing on the first intermediate voltage value and the pre-acquired first rotor voltage component through the summing module to obtain a first directional voltage value.

[0242] Furthermore, the second orientation unit comprises:

[0243] a fourth analysis subunit, configured to perform difference processing on the second rotor parameter current component and the second rotor current component by using a difference module to obtain a second difference;

[0244] A fifth analysis subunit, configured to input the second difference into a PI controller for voltage regulation to obtain a second intermediate voltage value;

[0245] The sixth analysis subunit is used to perform difference processing on the second intermediate voltage value and the pre-acquired second rotor voltage component through a difference module to obtain a second directional voltage value.

[0246] See also Fig.10 , Fig.10 This is a structural block diagram of a computer device provided in Embodiment 4 of the present invention.

[0247] An electronic device according to an embodiment of the present invention comprises: a memory 401 and a processor 402, wherein the memory 402 stores a computer program; when the computer program is executed by the processor 402, the processor 402 executes a power control method for a doubly-fed pumped storage unit according to any of the above embodiments.

[0248] The memory 401 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk or a ROM. The memory 401 has a storage space 403 for a program code 413 for executing any method step in the above method. For example, the storage space 403 for the program code may include individual program codes 413 for implementing the various steps in the above method, respectively. These program codes may be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. The program code may be compressed, for example, in an appropriate form. When these codes are run by a computing and processing device, the computing and processing device performs the various steps in the method described above. These program codes may be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. The program code may be compressed, for example, in an appropriate form. When these codes are executed by a computing and processing device, they cause the computing and processing device to execute the various steps in the above-described double-fed pumped storage unit power control method.

[0249] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0250] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0251] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0252] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0253] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0254] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power control method for a double-fed pumped storage unit, characterized in that: include: Acquire motor operating parameters of the doubly-fed pumped storage unit, and input the motor operating parameters into a preset machine-side control loop model, wherein the machine-side control loop model includes a generalized integral module, a power loop, and a stator flux control module; The generalized integral module is used to perform integral transformation on the motor operating parameters to obtain output power parameters and rotor current component parameters; Performing power regulation processing on the output power parameter through the power ring to obtain a given reference value of the rotor current; Inputting the rotor current given reference value and the rotor current component parameter into the stator flux control module for flux regulation processing to obtain a machine-side converter control instruction for the doubly-fed pumped storage unit; The machine-side converter control instruction is used to perform power regulation on the double-fed pumped storage unit.

2. The power control method of a double-fed pumped storage unit according to claim 1, characterized in that: The generalized integration module includes a first integrator, a second integrator and a first coordinate transformer, the motor operating parameters include a stator voltage value, a stator current value, a rotor speed and a rotor current value, and the step of using the generalized integration module to perform integral transformation on the motor operating parameters to obtain output power parameters and rotor current component parameters includes: Inputting the stator voltage value and the stator current value into the first integrator for integration operation respectively to obtain a stator voltage component parameter and a stator current component parameter; Using the second integrator to perform integration operation on the rotor speed to obtain a rotor position angle; Performing coordinate transformation on the rotor current value by the first coordinate transformer to obtain rotor current component parameters; Inputting the stator voltage component parameter and the stator current component parameter into a preset stator side output power model to obtain stator side active power and stator side reactive power; The stator side active power, the stator side reactive power and the rotor position angle are determined as output power parameters.

3. The power control method of a double-fed pumped storage unit according to claim 2, characterized in that: The first integrator includes a second coordinate transformation module, a generalized integrator group, a first adaptive control module, a third coordinate transformation module and a second adaptive control module. The processing process of the first integrator is specifically as follows: Performing coordinate transformation on the input operation parameters through the second coordinate transformation module to obtain operation component parameters; Inputting the operating component parameter and the pre-acquired feedback frequency value into the generalized integrator group for integration operation to obtain two operating integral quantities, wherein the generalized integrator group includes two generalized integrators; Performing frequency tracking processing on the two operating integral quantities through the first adaptive control module to obtain a first tracking component and a second tracking component; Inputting the first tracking component and the second tracking component into the third coordinate transformation module to obtain a first component value and a second component value; Using the second adaptive control module to perform an integration operation on the second component value to obtain a third component value, wherein the second adaptive control module includes a PI controller, a summing operation module and a second integrator connected in sequence; The first component value, the second component value and the third component value are adopted as output component parameters.

4. The power control method of a double-fed pumped storage unit according to claim 2, characterized in that: The power ring includes an active ring and a reactive ring, and the step of performing power regulation processing on the output power parameter through the power ring to obtain a given reference value of the rotor current includes: The stator side active power, the rotor position angle and a preset active power given value are input into the active loop for integration operation to obtain the rotor current position angle; Inputting the stator side reactive power and the preset reactive power given value into the reactive loop for integration operation to obtain a rotor current reference amplitude; The rotor current position angle and the rotor current reference amplitude are used as rotor current given reference values.

5. The power control method of a double-fed pumped storage unit according to claim 1, characterized in that: The stator flux control module includes a fourth coordinate transformation module, a fifth coordinate transformation module, a flux directional control module, a virtual reactance module and an SPWM modulator. The step of inputting the rotor current given reference value and the rotor current component parameter into the stator flux control module for flux regulation processing to obtain the machine-side converter control instruction of the doubly-fed pumped storage unit includes: Inputting the rotor current given reference value into the fourth coordinate transformation module for coordinate transformation to obtain rotor three-phase current reference parameters; Performing coordinate transformation on the rotor three-phase current reference parameter by the fifth coordinate transformation module to obtain rotor reference current component parameters; Inputting the rotor reference current component parameter and the rotor current component parameter into the flux linkage orientation control module for flux linkage orientation adjustment processing to obtain a rotor reference voltage parameter, wherein the flux linkage orientation control module includes a first orientation module, a second orientation module and a sixth coordinate transformation module; Inputting the rotor reference voltage parameter into the virtual reactance module for reactance regulation processing to obtain a regulation voltage parameter; The SPWM modulator performs modulation conversion processing on the regulating voltage parameter to obtain a control instruction for the machine-side converter of the double-fed pumped storage unit.

6. The power control method of a double-fed pumped storage unit according to claim 5, characterized in that: The rotor reference current component parameter includes a first rotor reference current component and a second rotor reference current component, the rotor current component parameter includes a first rotor current component and a second rotor current component, and the step of inputting the rotor reference current component parameter and the rotor current component parameter into the flux oriented control module for flux oriented adjustment processing to obtain the rotor reference voltage parameter includes: Inputting the first rotor reference current component, the first rotor current component and the pre-acquired first rotor voltage component into the first directional module to obtain a first directional voltage value, wherein the first directional module includes a difference module, a PI controller and a summing module connected in sequence; Inputting the second rotor parameter current component, the second rotor current component and the pre-acquired second rotor voltage component into the second directional module to obtain a second directional voltage value, wherein the second directional voltage value includes a difference module, a PI controller and a difference module connected in sequence; The first directional voltage value and the second directional voltage value are subjected to coordinate transformation by the sixth coordinate transformation module to obtain a rotor reference voltage parameter.

7. The power control method of a double-fed pumped storage unit according to claim 6, characterized in that: The step of inputting the first rotor reference current component, the first rotor current component and the pre-acquired first rotor voltage component into the first orientation module to obtain a first orientation voltage value comprises: Using a difference module to perform difference processing on the first rotor reference current component and the first rotor current component to obtain a first difference; Inputting the first difference into a PI controller for voltage regulation to obtain a first intermediate voltage value; The first intermediate voltage value and the pre-acquired first rotor voltage component are added together by an adding module to obtain a first directional voltage value.

8. The power control method of a double-fed pumped storage unit according to claim 6, characterized in that: The step of inputting the second rotor parameter current component, the second rotor current component and the pre-acquired second rotor voltage component into the second directional module to obtain a second directional voltage value comprises: Using a difference module to perform difference processing on the second rotor parameter current component and the second rotor current component to obtain a second difference; Inputting the second difference into a PI controller for voltage regulation to obtain a second intermediate voltage value; The second intermediate voltage value and the pre-acquired second rotor voltage component are subjected to difference processing by a difference module to obtain a second directional voltage value.

9. A double-fed pumped storage unit power control system, characterized in that: include: An acquisition module, used for acquiring motor operating parameters of a doubly-fed pumped storage unit, and inputting the motor operating parameters into a preset machine-side control loop model, wherein the machine-side control loop model includes a generalized integral module, a power loop, and a stator flux control module; An integration module, used for performing an integration transformation on the motor operation parameters by using the generalized integration module to obtain output power parameters and rotor current component parameters; A power regulation module, used for performing power regulation processing on the output power parameter through the power ring to obtain a given reference value of the rotor current; A flux regulation module, used for inputting the rotor current given reference value and the rotor current component parameter into the stator flux control module for flux regulation processing, so as to obtain a machine-side converter control instruction of the doubly-fed pumped storage unit; An execution module is used to use the machine-side converter control instruction to perform power regulation on the double-fed pumped storage unit.

10. An electronic device, characterized in that: It comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the power control method of the doubly-fed pumped storage unit as described in any one of claims 1 to 8.

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