Energy storage type wind power plant voltage compensation method, system, device, medium and equipment

Abstract

The invention belongs to the technical field of power grid voltage control, and provides an energy storage type wind power plant voltage compensation method, system and device, a storage medium and electronic equipment. The method comprises the following steps: setting a wind power plant bus three-phase voltage unbalance degree expected value, a wind power plant bus three-phase voltage deviation expected value, equivalent short-circuit impedance and a wind power plant bus phase voltage rated value; acquiring voltage information and current information, and respectively acquiring complex power actual values of the three-phase power supply of the bus of the wind power plant by taking the A-phase voltage as reference voltage; according to the equivalent short-circuit impedance and the wind power plant bus three-phase power supply complex power actual value, matching reference complex power of two ports of the low-voltage side of the compensation transformer; and generating a PWM (Pulse Width Modulation) signal for driving a static var generator according to the reference complex power, and performing voltage compensation on the wind power plant. The actual data of each phase voltage is obtained, and the result accuracy is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of power grid voltage control, and in particular relates to a voltage compensation method, system, device, storage medium and electronic equipment for an energy storage type wind farm. Background Art

[0002] As the power load level increases, the negative sequence current injected by the power load into the wind farm is also increasing. In particular, high-power single-phase loads will inject a large amount of negative sequence current into the wind farm, causing serious three-phase voltage imbalance in the wind farm, reducing the service life of the unit, and in severe cases, causing the converter to fail and disconnect from the grid, causing large-scale power outages in the power grid. When the three-phase voltage in the wind farm is unbalanced, the method of equivalent three-phase voltage to single-phase voltage in the traditional power system voltage compensation method is no longer applicable.

[0003] Therefore, how to solve the problem of three-phase voltage imbalance in energy storage wind farms and effectively control the three-phase voltage deviation in the field within the specified range is one of the key issues that need to be urgently solved in current energy storage wind farms. Summary of the invention

[0004] To solve the above problems, the present disclosure provides a voltage compensation method, system, device, storage medium and electronic device for an energy storage type wind farm. The relationship between the three-phase voltage deviation value and the expected value of the three-phase voltage deviation is judged by the voltage parameters and current parameters of each phase of the three-phase power supply under the theoretical working state and the actual working state. Based on the relationship between the three-phase voltage deviation value and the expected value of the three-phase voltage deviation, a reference complex power for additionally compensating the two ports on the low-voltage side of the transformer is determined. A PWM signal for driving a static VAR generator is generated according to the reference complex power, and voltage compensation is performed on the wind farm so that the three-phase voltage deviation meets the requirements.

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a voltage compensation method for an energy storage type wind farm, the method comprising:

[0006] Set the expected value of the three-phase voltage unbalance of the wind farm bus, the expected value of the three-phase voltage deviation of the wind farm bus, the equivalent short-circuit impedance and the rated value of the wind farm bus phase voltage;

[0007] The voltage information and current information are obtained, and the A phase voltage is used as the reference voltage to obtain the actual complex power value of the three-phase power supply of the wind farm bus;

[0008] The reference complex power of the two ports on the low-voltage side of the compensation transformer is matched according to the equivalent short-circuit impedance and the actual value of the complex power of the three-phase power supply of the wind farm busbar;

[0009] A PWM signal for driving a static VAR generator is generated according to the reference complex power to perform voltage compensation on the wind farm.

[0010] According to a preferred embodiment of the present invention, matching the reference complex power of two ports on the low-voltage side of the compensation transformer according to the equivalent short-circuit impedance and the actual value of the complex power of the wind farm bus three-phase power supply includes:

[0011] Generate a three-phase voltage deviation value of the wind farm bus when the three-phase power is the same according to the equivalent short-circuit impedance and the actual value of the complex power of the three-phase power supply of each wind farm bus;

[0012] The absolute value of the three-phase voltage deviation value of the wind farm bus is compared with the expected value of the three-phase voltage deviation of the wind farm bus to determine whether the reactive power in the wind farm meets the requirement.

[0013] According to a preferred embodiment of the present invention, the reference complex power of the two ports on the low-voltage side of the matching compensation transformer includes:

[0014] When the comparison result meets the preset requirement, it indicates that the reactive power in the wind farm meets the requirement;

[0015] The three-phase voltage imbalance degree of the wind farm bus after compensation and the three-phase voltage deviation value of the wind farm bus after compensation are obtained, and the reference complex power of the two ports on the low-voltage side of the additional compensation transformer is matched by the expected value of the three-phase voltage imbalance degree of the wind farm bus and the actual value of the three-phase power complex power of the wind farm bus.

[0016] According to a preferred embodiment of the present invention, the reference complex power of the two ports on the low-voltage side of the matching compensation transformer includes:

[0017] When the comparison result does not meet the preset requirement, it indicates that the reactive power in the wind farm does not meet the requirement;

[0018] The reference complex power for additionally compensating the two ports on the low-voltage side of the transformer is matched by matching the actual value of the three-phase complex power of the wind farm bus, the equivalent short-circuit impedance, the rated value of the wind farm bus phase voltage, and the expected value of the three-phase voltage deviation of the wind farm bus.

[0019] In order to solve the above technical problems, the second aspect of the present invention proposes a voltage compensation system for an energy storage type wind farm, the system comprising: a data acquisition module, a data processing module, a data matching module and an execution module;

[0020] The data acquisition module is used to set the expected value of the three-phase voltage imbalance of the wind farm bus, the expected value of the three-phase voltage deviation of the wind farm bus, the equivalent short-circuit impedance and the rated value of the phase voltage of the wind farm bus;

[0021] The data processing module is used to obtain voltage information and current information, and to obtain the actual value of the complex power of the three-phase power supply of the wind farm busbar by taking the A-phase voltage as the reference voltage;

[0022] The data matching module is used to match the reference complex power of the two ports on the low-voltage side of the compensation transformer according to the equivalent short-circuit impedance and the actual value of the complex power of the wind farm bus three-phase power supply;

[0023] The execution module is used to generate a PWM signal for driving a static VAR generator according to the reference complex power, so as to perform voltage compensation on the wind farm.

[0024] According to a preferred embodiment of the present invention, it comprises:

[0025] The data matching module is also used to generate a three-phase voltage deviation value of the wind farm bus when the three-phase power is the same according to the equivalent short-circuit impedance and the actual value of the complex power of the three-phase power supply of each wind farm bus;

[0026] The data matching module is also used to compare the absolute value of the wind farm bus three-phase voltage deviation value with the wind farm bus three-phase voltage deviation expected value to determine whether the reactive power in the wind farm meets the requirement.

[0027] According to a preferred embodiment of the present invention, it comprises:

[0028] The data matching module is also used to indicate that the reactive power in the wind farm meets the requirement when the comparison result meets the preset requirement;

[0029] The data matching module is also used to obtain the three-phase voltage imbalance of the wind farm bus after compensation and the three-phase voltage deviation value of the wind farm bus after compensation, and to match the reference complex power of the two ports on the low-voltage side of the additional compensation transformer through the expected value of the three-phase voltage imbalance of the wind farm bus and the actual value of the three-phase power complex power of the wind farm bus.

[0030] In order to solve the above technical problems, the third aspect of the present invention provides a voltage compensation device for an energy storage type wind farm, the device comprising: a compensation transformer, a static VAR generator and a controller;

[0031] The low-voltage side of the compensation transformer is connected to the static VAR generator, and the high-voltage side is connected to the busbar;

[0032] The AC side of the static VAR generator is connected to the low voltage side of the compensation transformer, and the DC side is a capacitor;

[0033] The controller is used to receive voltage information and current information, and based on the method described in any of the above embodiments, controls the static VAR generator in real time to obtain a reference complex power for additionally compensating the two ports on the low-voltage side of the transformer, and the compensation transformer completes voltage compensation.

[0034] In order to solve the above technical problems, the fourth aspect of the present invention proposes a computer storage medium, wherein the computer storage medium stores one or more programs, and when the one or more programs are executed by a processor, the method described in any one of the above embodiments is implemented.

[0035] In order to solve the above technical problems, the fifth aspect of the present invention provides an electronic device, comprising:

[0036] processor;

[0037] and a memory storing computer executable instructions, wherein the computer executable instructions, when executed, cause the processor to perform the method described in any one of the above embodiments.

[0038] Compared with the prior art, the present invention has the following advantages: the present invention obtains the three-phase voltage imbalance and the expected value of the three-phase voltage deviation of the three-phase power supply, and calculates the actual value of the three-phase power supply complex power, and judges the relationship between the three-phase voltage deviation value and the expected value of the three-phase voltage deviation through the voltage parameters and current parameters of each phase power supply in the three-phase power supply under the theoretical working state and the actual working state, and then determines the reference complex power for additionally compensating the two ports on the low-voltage side of the transformer, and generates a PWM signal for driving the static VAR generator according to the reference complex power, and performs voltage compensation on the wind farm, so that the three-phase voltage deviation meets the requirements. By judging the relationship between the three-phase voltage deviation value and the expected value of the three-phase voltage deviation, different processing methods are used to obtain the reference complex power for additionally compensating the two ports on the low-voltage side of the transformer, and the actual data of each phase voltage is obtained, so as to ensure the accuracy of the output result.

[0039] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 The basic topological structure of an energy storage type wind farm compensation device corresponding to an embodiment of the present invention is shown;

[0042] Figure 2 A schematic diagram of a voltage compensation method for an energy storage type wind farm according to an embodiment of the present invention is shown;

[0043] Figure 3 A second schematic flow chart of a voltage compensation method for an energy storage type wind farm according to an embodiment of the present invention is shown;

[0044] Figure 4 A third schematic diagram of a process flow of a voltage compensation method for an energy storage type wind farm according to an embodiment of the present invention is shown;

[0045] Figure 5 A fourth schematic flow chart of a voltage compensation method for an energy storage type wind farm according to an embodiment of the present invention is shown;

[0046] Figure 6 A structural block diagram of a voltage compensation system for an energy storage type wind farm according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 described embodiments are 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.

[0048] The same reference numerals in the drawings represent the same or similar elements, components or parts, and thus the repeated description of the same or similar elements, components or parts may be omitted below. It should also be understood that although the first, second, third and other attributives representing the numbers may be used herein to describe various devices, elements, components or parts, these devices, elements, components or parts should not be limited by these attributives. In other words, these attributives are only used to distinguish one from another. For example, the first device may also be called the second device, but it does not deviate from the essential technical solution of the present invention. In addition, the terms "and / or" and "and / or" refer to all combinations including any one or more of the listed items.

[0049] See also Figure 1 , Figure 1 The present invention provides a basic topological structure of a corresponding energy storage type wind farm compensation device, such as Figure 1 As shown, the device includes: a power generation unit and an energy storage type wind farm, the power generation unit includes an energy storage medium, the energy storage type wind farm includes a step-up transformer, a bus, a voltage transformer VT, a current transformer AT and a compensation device, and the compensation device includes a compensation transformer, a static VAR generator SVG, a controller and PWM.

[0050] In this embodiment, the low-voltage side of the compensation transformer is connected to the static VAR generator, and the high-voltage side is connected to the busbar.

[0051] In this embodiment, the AC side of the static VAR generator is connected to the low voltage side of the compensation transformer, and the DC side is a capacitor.

[0052] In this embodiment, the controller is used to receive voltage and current information collected by the voltage transformer and the current transformer, and control the static VAR generator in real time to obtain reference complex power for additional compensation of the two ports on the low-voltage side of the transformer, and the compensation transformer completes voltage compensation.

[0053] In this embodiment, the compensation device is used to compensate for the three-phase voltage imbalance and control the three-phase voltage deviation.

[0054] See also Figure 2 , Figure 2 This is a schematic diagram of a flow chart of a voltage compensation method for an energy storage type wind farm provided by the present invention. Figure 2 As shown, the method includes:

[0055] S11. Set the expected value of the three-phase voltage unbalance of the wind farm bus, the expected value of the three-phase voltage deviation of the wind farm bus, the equivalent short-circuit impedance and the rated value of the phase voltage of the wind farm bus.

[0056] In this embodiment, the expected value of three-phase voltage imbalance, the expected value of three-phase voltage deviation and the rated value of bus phase voltage are set according to the data of the best historical operating state of the energy storage wind farm, and the equivalent short-circuit impedance is obtained by short-circuit test measurement.

[0057] S12, obtaining voltage information and current information, taking the A phase voltage as a reference voltage, and obtaining actual values ​​of the wind farm bus three-phase power complex power.

[0058] In this embodiment, the voltage information and current information transmitted by the voltage transformer and the current transformer are obtained, and the A phase voltage is used as the reference voltage to obtain the actual value of the three-phase power complex power. The actual value of the three-phase power complex power includes active power and reactive power. Figure 1 Taking a storage-type wind farm compensation device as an example, it is stipulated that its positive direction is from the low-voltage side of the step-up transformer to the high-voltage side.

[0059] After obtaining the expected value of three-phase voltage imbalance, the expected value of three-phase voltage deviation, the equivalent short-circuit impedance and the rated value of bus phase voltage, any phase voltage among phases A, B and C can be used as a reference voltage. Specifically, in this scheme, the voltage of phase A can be used as a reference voltage to determine the actual value of the complex power of the three-phase power supply.

[0060] Specifically,

[0061] Among them, U d％_p,i is the three-phase voltage deviation value when the three-phase power is the same, SA is the actual value of the complex power of phase A power supply, S B is the actual value of the complex power of phase B power supply, S c is the actual value of the complex power of phase C power supply, Z is the equivalent short-circuit impedance, U is the rated value of the bus phase voltage, real is a function that returns the real part of a complex number, and imag is a function that returns the imaginary part of a complex number.

[0062] S13, matching the reference complex power of the two ports on the low-voltage side of the compensation transformer according to the equivalent short-circuit impedance and the actual value of the complex power of the wind farm bus three-phase power supply.

[0063] In this embodiment, the reference complex powers of the two ports on the low-voltage side of the compensation transformer are matched according to the obtained equivalent short-circuit impedance and the actual value of the complex power of the wind farm bus three-phase power supply.

[0064] S14. Generate a PWM signal for driving a static VAR generator according to the reference complex power to perform voltage compensation on the wind farm.

[0065] In this embodiment, the static VAR generator is also called SVG. After obtaining the reference complex power for additionally compensating the two ports on the low-voltage side of the transformer, the reference complex power is transmitted to the SVG driving end to generate a PWM signal for driving the SVG to complete voltage compensation.

[0066] See also Figure 3 , Figure 3 The second flow chart of a voltage compensation method for an energy storage type wind farm provided by the present invention is as follows: Figure 3 As shown, the method includes:

[0067] S21. Generate a three-phase voltage deviation value of the wind farm bus when the three-phase power is the same according to the equivalent short-circuit impedance and the actual value of the complex power of the three-phase power supply of each wind farm bus.

[0068] In this embodiment, after obtaining the expected value of the three-phase voltage imbalance, the expected value of the three-phase voltage deviation, the equivalent short-circuit impedance and the rated value of the bus phase voltage, each phase voltage is used as a reference voltage, and any one of the phases A, B and C can be used as a reference voltage. Specifically, in this scheme, the A phase voltage can be used as a reference voltage to determine the actual value of the three-phase power complex power, and based on the equivalent short-circuit impedance, the three-phase voltage deviation value when the three-phase power is the same can be determined.

[0069] Specifically,

[0070] Among them, U d％_p,i is the three-phase voltage deviation value when the three-phase power is the same, S A is the actual value of the complex power of phase A power supply, S B is the actual value of the complex power of phase B power supply, S cis the actual value of the complex power of phase C power supply, Z is the equivalent short-circuit impedance, U is the rated value of the bus phase voltage, real is the function that returns the real part of the complex number, and imag is the function that returns the imaginary part of the complex number.

[0071] S22: Compare the absolute value of the three-phase voltage deviation value of the wind farm bus with the expected value of the three-phase voltage deviation of the wind farm bus to determine whether the reactive power in the wind farm meets the requirement.

[0072] In this embodiment, after obtaining the absolute value of the wind farm bus three-phase voltage deviation value and the wind farm bus three-phase voltage deviation expected value, it is determined whether the reactive power in the wind farm meets the requirement according to the comparison result.

[0073] See also Figure 4 , Figure 4 The third is a flow chart of a voltage compensation method for an energy storage type wind farm provided by the present invention. Figure 4 As shown, the method includes:

[0074] S31. When the comparison result meets the preset requirement, it indicates that the reactive power in the wind farm meets the requirement.

[0075] In this embodiment, when the absolute value of the wind farm bus three-phase voltage deviation value is not greater than the wind farm bus three-phase voltage deviation expected value, the comparison result meets the preset requirement, indicating that the reactive power in the wind farm meets the requirement.

[0076] S32, obtaining the three-phase voltage imbalance degree of the wind farm bus after compensation and the three-phase voltage deviation value of the wind farm bus after compensation, and matching the expected value of the three-phase voltage imbalance degree of the wind farm bus and the actual value of the three-phase power complex power of the wind farm bus to obtain the reference complex power for additional compensation of the two ports on the low-voltage side of the transformer.

[0077] In this embodiment, the three-phase voltage unbalance degree of the wind farm bus and the three-phase voltage deviation value of the wind farm bus after compensation are not independent of each other. When the comparison result meets the preset requirements, it is necessary to ensure that the three-phase voltage unbalance degree and the three-phase voltage deviation value after compensation meet the requirements. The relationship between the three-phase voltage unbalance degree after compensation and the three-phase voltage deviation value after compensation needs to meet certain conditions.

[0078] Specifically,

[0079] Among them, U d％_h,i is the three-phase voltage deviation value after compensation, m i is the compensation coefficient, V un_h To compensate for the imbalance of the three-phase voltage, V un To compensate for the actual value of the unbalanced voltage of the first three phases, S iis the actual value of the three-phase power complex power, Z is the equivalent short-circuit impedance, U is the rated value of the bus phase voltage, real is a function that returns the real part of a complex number, and imag is a function that returns the imaginary part of a complex number.

[0080] In this embodiment, the way to obtain the compensation coefficient is related to the electrical connection method of the high-voltage side of the compensation transformer. Figure 1 The connection relationship shown, Figure 1 The basic topology structure of a wind farm compensation device with energy storage is used to obtain the compensation coefficient.

[0081] Specifically,

[0082]

[0083] Among them, m A is the A phase compensation coefficient, m B is the B phase compensation coefficient, m C is the C phase compensation coefficient, S un is the active power, Z is the equivalent short-circuit impedance, U is the bus phase voltage rated value, real is a function that returns the real part of a complex number, and imag is a function that returns the imaginary part of a complex number.

[0084] In this embodiment, after the compensation coefficient of each phase is obtained, the active power of the reference complex power of the two ports on the low-voltage side of the compensation transformer is generated.

[0085] Specifically,

[0086] Among them, S un is the active power, S A is the actual value of the complex power of phase A power supply, S B is the actual value of the complex power of phase B power supply, S c is the actual value of the complex power of phase C power supply, e is a natural constant, j is a complex unit, A is the connection angle of phase A voltage, B is the connection angle of the B-phase voltage, C is the connection angle of the C-phase voltage.

[0087] In this embodiment, the reference complex power of the two ports on the low-voltage side of the compensation transformer is obtained by using the active power of the reference complex power of the two ports on the low-voltage side of the compensation transformer.

[0088] Specifically,

[0089]

[0090] Among them, S ref,1 is the first reference complex power, S ref,2is the second reference complex power, V un_h,A To compensate for the unbalanced voltage of phase A, V un_h,B To compensate for the unbalanced voltage of phase B, V un_h,C To compensate for the unbalanced voltage of phase C, V un_ref is the expected value of three-phase voltage unbalance, V un To compensate for the actual value of the unbalanced voltage of the first three phases, S un is the active power and min is the smallest element in a set.

[0091] See also Figure 5 , Figure 5 The fourth is a flow chart of a voltage compensation method for an energy storage type wind farm provided by the present invention. Figure 5 As shown, the method includes:

[0092] S41. When the comparison result does not meet the preset requirement, it indicates that the reactive power in the wind farm does not meet the requirement.

[0093] In this embodiment, when the absolute value of the wind farm bus three-phase voltage deviation value is greater than the wind farm bus three-phase voltage deviation expected value, the comparison result meets the preset requirement, indicating that the reactive power in the wind farm meets the requirement.

[0094] S42, matching the reference complex power for additionally compensating the two ports on the low-voltage side of the transformer through the actual values ​​of the three-phase complex powers of the wind farm bus, the equivalent short-circuit impedance, the rated values ​​of the phase voltages of the wind farm bus, and the expected values ​​of the three-phase voltage deviations of the wind farm bus.

[0095] In this embodiment, under the condition that the power of the three-phase power supply is equal, in order to make the three-phase voltage deviation meet the requirements, the reactive power that needs to be compensated is obtained.

[0096] Specifically,

[0097]

[0098] Among them, Q ref is the reactive power to be compensated, S A is the actual value of the complex power of phase A power supply, S B is the actual value of the complex power of phase B power supply, S c is the actual value of the complex power of phase C power supply, Z is the equivalent short-circuit impedance, U is the rated value of the bus phase voltage, U d％_ref is the expected value of the three-phase voltage deviation, real is a function that returns the real part of a complex number, imag is a function that returns the imaginary part of a complex number, and min is the smallest element in a set.

[0099] In this embodiment, the reference complex power of the two ports on the low-voltage side of the compensation transformer is generated according to the obtained reactive power that needs to be compensated.

[0100] Specifically,

[0101]

[0102]

[0103] Among them, S ref,1 is the first reference complex power, S ref,2 is the second reference complex power, S un is the active power, Q ref is the reactive power, e is a natural constant, j is a complex unit, and π is the circumference of a circle.

[0104] See also Figure 6 , Figure 6 This is a block diagram of a voltage compensation system for an energy storage type wind farm provided by the present invention, such as Figure 6 As shown, the system includes: a data acquisition module 11, a data processing module 12, a data matching module 13 and an execution module 14.

[0105] In this embodiment, the data acquisition module 11 is specifically used to set the expected value of the three-phase voltage unbalance of the wind farm bus, the expected value of the three-phase voltage deviation of the wind farm bus, the equivalent short-circuit impedance and the rated value of the wind farm bus phase voltage;

[0106] In this embodiment, the data processing module 12 is specifically used to obtain voltage information and current information, and to obtain the actual value of the complex power of the three-phase power supply of the wind farm bus by taking the A phase voltage as the reference voltage;

[0107] In this embodiment, the data matching module 13 is specifically used to match the reference complex power of the two ports on the low-voltage side of the compensation transformer according to the equivalent short-circuit impedance and the actual value of the complex power of the wind farm bus three-phase power supply;

[0108] In this embodiment, the execution module 14 is specifically configured to generate a PWM signal for driving a static VAR generator according to the reference complex power, so as to perform voltage compensation on the wind farm.

[0109] In this embodiment, the data matching module 13 is specifically used to generate the three-phase voltage deviation value of the wind farm bus when the three-phase power is the same according to the equivalent short-circuit impedance and the actual value of the complex power of the three-phase power supply of each wind farm bus;

[0110] In this embodiment, the data matching module 13 is specifically used to compare the absolute value of the wind farm bus three-phase voltage deviation value with the wind farm bus three-phase voltage deviation expected value to determine whether the reactive power in the wind farm meets the requirement.

[0111] In this embodiment, the data matching module 13 is specifically used to indicate that the reactive power in the wind farm meets the requirement when the comparison result meets the preset requirement;

[0112] In this embodiment, the data matching module 13 is specifically used to obtain the three-phase voltage imbalance of the wind farm bus after compensation and the three-phase voltage deviation value of the wind farm bus after compensation, and to match the reference complex power of the two ports on the low-voltage side of the additional compensation transformer through the expected value of the three-phase voltage imbalance of the wind farm bus and the actual value of the three-phase power complex power of the wind farm bus.

[0113] An embodiment of the present invention provides a computer storage medium, wherein the computer storage medium stores one or more programs, and the one or more programs can be executed by one or more controllers to implement the determination method of any of the above embodiments.

[0114] An embodiment of the present invention provides an electronic device, including a controller and a memory storing computer executable instructions, wherein the computer executable instructions, when executed, enable the controller to execute a method according to any one of the above embodiments.

[0115] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A voltage compensation method for an energy storage type wind farm, characterized in that: The method comprises: Set the expected value of the three-phase voltage unbalance of the wind farm bus, the expected value of the three-phase voltage deviation of the wind farm bus, the equivalent short-circuit impedance and the rated value of the wind farm bus phase voltage; The voltage information and current information are obtained, and the A phase voltage is used as the reference voltage to obtain the actual complex power value of the three-phase power supply of the wind farm bus; The reference complex power of the two ports on the low-voltage side of the compensation transformer is matched according to the equivalent short-circuit impedance and the actual value of the complex power of the three-phase power supply of the wind farm busbar; A PWM signal for driving a static VAR generator is generated according to the reference complex power to perform voltage compensation on the wind farm.

2. The compensation method according to claim 1, characterized in that: Matching the reference complex power of two ports on the low-voltage side of the compensation transformer according to the equivalent short-circuit impedance and the actual value of the complex power of the wind farm bus three-phase power supply includes: Generate a three-phase voltage deviation value of the wind farm bus when the three-phase power is the same according to the equivalent short-circuit impedance and the actual value of the complex power of the three-phase power supply of each wind farm bus; The absolute value of the three-phase voltage deviation value of the wind farm bus is compared with the expected value of the three-phase voltage deviation of the wind farm bus to determine whether the reactive power in the wind farm meets the requirement.

3. The compensation method according to claim 2, characterized in that: The reference complex power of the two ports on the low-voltage side of the matching compensation transformer includes: When the comparison result meets the preset requirement, it indicates that the reactive power in the wind farm meets the requirement; The three-phase voltage imbalance degree of the wind farm bus after compensation and the three-phase voltage deviation value of the wind farm bus after compensation are obtained, and the reference complex power of the two ports on the low-voltage side of the additional compensation transformer is matched by the expected value of the three-phase voltage imbalance degree of the wind farm bus and the actual value of the three-phase power complex power of the wind farm bus.

4. The compensation method according to claim 2, characterized in that: The reference complex power of the two ports on the low-voltage side of the matching compensation transformer includes: When the comparison result does not meet the preset requirement, it indicates that the reactive power in the wind farm does not meet the requirement; The reference complex power for additionally compensating the two ports on the low-voltage side of the transformer is matched by matching the actual value of the three-phase complex power of the wind farm bus, the equivalent short-circuit impedance, the rated value of the wind farm bus phase voltage, and the expected value of the three-phase voltage deviation of the wind farm bus.

5. A voltage compensation system for an energy storage wind farm, characterized in that: The system comprises: a data acquisition module, a data processing module, a data matching module and an execution module; The data acquisition module is used to set the expected value of the three-phase voltage imbalance of the wind farm bus, the expected value of the three-phase voltage deviation of the wind farm bus, the equivalent short-circuit impedance and the rated value of the phase voltage of the wind farm bus; The data processing module is used to obtain voltage information and current information, and to obtain the actual value of the complex power of the three-phase power supply of the wind farm busbar by taking the A-phase voltage as the reference voltage; The data matching module is used to match the reference complex power of the two ports on the low-voltage side of the compensation transformer according to the equivalent short-circuit impedance and the actual value of the complex power of the wind farm bus three-phase power supply; The execution module is used to generate a PWM signal for driving a static VAR generator according to the reference complex power, so as to perform voltage compensation on the wind farm.

6. The compensation system according to claim 5, characterized in that: include: The data matching module is also used to generate a three-phase voltage deviation value of the wind farm bus when the three-phase power is the same according to the equivalent short-circuit impedance and the actual value of the complex power of the three-phase power supply of each wind farm bus; The data matching module is also used to compare the absolute value of the wind farm bus three-phase voltage deviation value with the wind farm bus three-phase voltage deviation expected value to determine whether the reactive power in the wind farm meets the requirement.

7. The compensation system according to claim 6, characterized in that include: The data matching module is also used to indicate that the reactive power in the wind farm meets the requirement when the comparison result meets the preset requirement; The data matching module is also used to obtain the three-phase voltage imbalance of the wind farm bus after compensation and the three-phase voltage deviation value of the wind farm bus after compensation, and to match the reference complex power of the two ports on the low-voltage side of the additional compensation transformer through the expected value of the three-phase voltage imbalance of the wind farm bus and the actual value of the three-phase power complex power of the wind farm bus.

8. A voltage compensation device for an energy storage type wind farm, characterized in that: The device comprises: a compensating transformer, a static VAR generator and a controller; The low-voltage side of the compensation transformer is connected to the static VAR generator, and the high-voltage side is connected to the busbar; The AC side of the static VAR generator is connected to the low voltage side of the compensation transformer, and the DC side is a capacitor; The controller is used to receive voltage information and current information, and based on the compensation method described in claims 1-4, controls the static VAR generator in real time to obtain reference complex power for additionally compensating the two ports on the low-voltage side of the transformer, and the compensation transformer completes voltage compensation.

9. A computer storage medium, characterized in that in, The computer storage medium stores one or more programs, and when the one or more programs are executed by a processor, the method according to any one of claims 1 to 4 is implemented.

10. An electronic device, characterized in that: include: processor; and a memory storing computer executable instructions which, when executed, cause the processor to perform the method according to any one of claims 1 to 4.

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