A wind-solar-storage system active compensation method, device, equipment and medium

Abstract

The application discloses a kind of wind light storage system active compensation method, device, equipment and medium, applied to electric power failure processing field, including obtaining the system frequency of target wind light storage system, super capacitor terminal voltage, energy storage state of charge and wind turbine energy state;According to system frequency and super capacitor terminal voltage setting first droop coefficient, according to system frequency and energy storage state of charge setting second droop coefficient, according to system frequency and wind turbine energy state setting third droop coefficient;According to the first droop coefficient, second droop coefficient and third droop coefficient, the total value of active compensation of target wind light storage system is calculated.The application can quickly respond and accurately adjust active compensation power, improve compensation accuracy, when system frequency fluctuates, according to the total value of active compensation corresponding to SVG and AGC Equipment is switched and the total value of corresponding active compensation is adjusted, the flexibility of system active compensation is improved, and the overall operation stability of wind light storage system is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of power fault processing, and in particular to a method, device, equipment and medium for active power compensation of a wind-solar-storage system. Background Art

[0002] With the continuous growth of energy demand and the improvement of environmental awareness, wind, solar and storage systems have attracted widespread attention as a renewable energy solution. They aim to provide stable and reliable energy supply by integrating wind energy and energy storage equipment.

[0003] However, existing wind, solar and storage systems have difficulty accurately adjusting the active power compensation when the frequency fluctuates, resulting in low compensation accuracy. In addition, in wind, solar and storage systems, the existing active power compensation method often uses fixed equipment to compensate the system for active power. In wind, solar and storage systems that include SVG (static VAR generator), the compensation effect of SVG and AGC (automatic power generation equipment) will change with frequency fluctuations. If a fixed method is still used for compensation, the compensation effect will be reduced, reducing the stability of the system.

[0004] It can be seen that how to dynamically adjust the active power compensation value of the wind, solar and storage system to optimize the compensation effect has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The present invention provides a method, device, equipment and medium for active power compensation of a wind-solar-storage system, so as to improve the active power compensation accuracy of the wind-solar-storage system.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a method for active power compensation of a wind-solar-storage system, comprising:

[0007] Obtain the system frequency, supercapacitor terminal voltage, energy storage charge state and wind turbine energy state of the target wind-solar-storage system.

[0008] A first droop coefficient is set according to the system frequency and the supercapacitor terminal voltage, a second droop coefficient is set according to the system frequency and the energy storage charge state, and a third droop coefficient is set according to the system frequency and the wind turbine energy state.

[0009] The total active compensation value of the target wind-solar-storage system is calculated according to the first droop coefficient, the second droop coefficient and the third droop coefficient.

[0010] When the frequency of the target wind, solar and storage system fluctuates, the total active compensation value when using static reactive power generation equipment is calculated as the first total active compensation value, and the total active compensation value when using automatic power generation equipment is calculated as the second total active compensation value. Active compensation is performed on the target wind, solar and storage system according to the first total active compensation value and the second total active compensation value.

[0011] Furthermore, setting a second droop coefficient according to the system frequency and the energy storage state of charge includes:

[0012] The change trend of the system frequency is determined according to the system frequency in continuous time.

[0013] A second droop coefficient is set according to the change trend.

[0014] Furthermore, setting the second droop coefficient according to the change trend includes:

[0015] When the change trend is an upward trend, the second droop coefficient is:

[0016]

[0017] Among them, K p is the second droop coefficient, K p,max is the maximum value of the second droop coefficient, SOC is the energy storage charge state, SOC min The minimum SOC value that does not trigger the energy storage unit alarm, SOC ref is the expected value of energy storage SOC, SOC max The maximum SOC value that does not trigger the energy storage alarm.

[0018] When the change trend is a downward trend, the second droop coefficient is:

[0019] .

[0020] Furthermore, the energy state of the wind turbine is:

[0021]

[0022] Among them, SOE i is the energy state of the i-th wind turbine in the wind-solar-storage system, and are the maximum and minimum angular velocity of the i-th fan, is the angular velocity of the i-th fan.

[0023] Furthermore, setting a third droop coefficient according to the system frequency and the energy state of the wind turbine generator system includes:

[0024] The change trend of the system frequency is determined according to the system frequency in continuous time.

[0025] A third droop coefficient is set according to the change trend.

[0026] Furthermore, the third droop coefficient consists of a differential droop coefficient and a proportional droop coefficient.

[0027] The setting of the third droop coefficient according to the change trend includes:

[0028] When the change trend is an upward trend, the differential droop coefficient is:

[0029]

[0030] Among them, K d is the differential droop coefficient, SOE is the energy state of the wind turbine, K d,max is the maximum value of the droop coefficient, SOE min is the minimum energy allowed for wind turbines, SOE ref is the standard value of wind turbine energy, SOE max is the maximum allowable energy of the wind turbine.

[0031] The proportional droop coefficient is:

[0032]

[0033] When the change trend is a downward trend, the differential droop coefficient is:

[0034]

[0035] The proportional droop coefficient is:

[0036]

[0037] Among them, K l is the proportional droop coefficient.

[0038] Furthermore, performing active power compensation on the target wind-solar-storage system according to the first total active power compensation value and the second total active power compensation value includes:

[0039] If the first total active power compensation value and the second total active power compensation value are both positive or negative, the second total active power compensation value is used to perform active power compensation on the target wind-solar-storage system.

[0040] Otherwise, the first total active power compensation value is used to perform active power compensation on the target wind-solar-storage system.

[0041] Another embodiment of the present invention provides an active power compensation device for a wind-solar-storage system, comprising:

[0042] The data acquisition module is used to obtain the system frequency, supercapacitor terminal voltage, energy storage charge state and wind turbine energy state of the target wind-solar-storage system.

[0043] A coefficient calculation module is used to set a first droop coefficient according to the system frequency and the supercapacitor terminal voltage, set a second droop coefficient according to the system frequency and the energy storage charge state, and set a third droop coefficient according to the system frequency and the wind turbine energy state.

[0044] A compensation calculation module is used to calculate the total active compensation value of the target wind-solar-storage system based on the first droop coefficient, the second droop coefficient and the third droop coefficient.

[0045] A dynamic compensation module is used to calculate the total active compensation value when using static reactive power generation equipment as the first total active compensation value, and calculate the total active compensation value when using automatic power generation equipment as the second total active compensation value when the frequency of the target wind-solar-storage system fluctuates, and to perform active compensation on the target wind-solar-storage system according to the first total active compensation value and the second total active compensation value.

[0046] Another embodiment of the present invention provides a computer device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the above-mentioned active power compensation method for the wind-solar-storage system when executing the computer program.

[0047] Yet another embodiment of the present invention provides a computer-readable storage medium storing a computer program. When the device where the computer-readable storage medium is located executes the computer program, the above-described method for active power compensation of the wind-solar-storage system is implemented.

[0048] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0049] By dynamically adjusting the droop coefficient, the active power compensation strategy can be flexibly set according to changes in system frequency. When the frequency fluctuates, the system can quickly respond and accurately adjust the active power compensation power, significantly improving compensation accuracy and ensuring stable operation of the wind, solar, and energy storage system under different operating conditions. When the system frequency fluctuates, the system intelligently switches compensation devices based on the corresponding active power compensation totals of the SVG and AGC, and dynamically adjusts the corresponding active power compensation totals. This improves the flexibility of the system's active power compensation and enhances the overall operational stability of the wind, solar, and energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1This is a flowchart of the steps of the active power compensation method of the wind-solar-storage system in one embodiment of the present invention;

[0051] Figure 2 This is a structural block diagram of an active power compensation device for a wind-solar-storage system in one embodiment of the present invention;

[0052] Figure 3 A structural diagram of a computer device provided in an embodiment of the present invention;

[0053] Reference numerals:

[0054] 21. Data acquisition module; 22. Coefficient calculation module; 23. Compensation calculation module; 24. Dynamic compensation module. DETAILED DESCRIPTION

[0055] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0056] In the description of this application, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0057] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two components. The terms "vertical", "horizontal", "left", "right", "up", "down" and similar expressions used herein are for illustrative purposes only, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood by those skilled in the art in specific circumstances.

[0059] With the rapid development of the global economy and the continuous growth of the population, energy demand continues to rise, putting enormous pressure on the supply of traditional fossil fuels. At the same time, greenhouse gas emissions and environmental pollution caused by their use are becoming increasingly serious. To address these challenges, the development and utilization of renewable energy sources such as wind and solar energy has become an inevitable trend in the global energy transition. However, despite the abundance of wind and solar energy resources, their output power is significantly affected by the natural environment and exhibits randomness and volatility. Therefore, in a combined wind, solar, and storage power generation system, output power fluctuations often have a significant impact on the power grid, sometimes even leading to voltage instability or even grid collapse. Therefore, when fluctuations occur in the wind, solar, and storage system, active power compensation is required. In wind, solar, and storage systems that include SVG (static VAR generator), the active power compensation values ​​corresponding to SVG and AGC (automatic generation control) are often different. There are certain differences between the two. When the system fluctuates, SVG compensation may sometimes be more effective, while AGC compensation may sometimes be more effective. Therefore, dynamic switching between the two is necessary.

[0060] An embodiment of the present invention provides a method for active power compensation of a wind-solar-storage system. For details, see Figure 1 , Figure 1 The flowchart shows the steps of the wind-solar-storage system active power compensation method in one embodiment of the present invention, including:

[0061] S11. Obtain the system frequency, supercapacitor terminal voltage, energy storage charge state, and wind turbine energy state of the target wind-solar-storage system.

[0062] When the frequency deviation value of the system exceeds the preset deviation tolerance value, the solution of this embodiment is executed. Specifically, this embodiment sets the deviation tolerance value to 0.05Hz. Therefore, when the frequency fluctuation of the target wind, solar and storage system is monitored to be greater than 0.05Hz, the system is controlled and compensated.

[0063] First, it is necessary to measure the system frequency, supercapacitor terminal voltage, and energy storage SOC (energy storage state of charge) of the target wind-solar-storage system, and calculate the wind turbine SOE (wind turbine energy state).

[0064] S12. Setting a first droop coefficient according to the system frequency and the supercapacitor terminal voltage, setting a second droop coefficient according to the system frequency and the energy storage charge state, and setting a third droop coefficient according to the system frequency and the wind turbine energy state.

[0065] Since the main components involved in active power compensation are energy storage units and some wind turbines, the energy storage units are calculated first. The conventional control method for energy storage units is droop control, which simulates the droop characteristics of synchronous generators so that the energy storage units can also change the corresponding active power output when the frequency changes. The traditional droop control expression is:

[0066]

[0067] in, K is the additional active power generated in droop control. c is the droop coefficient, For the system frequency at this time, is the rated frequency of the system. It can be seen that in this control mode, the droop coefficient K c The larger the K is, the more sensitive the active power output of the energy storage is to the change of the system frequency. c The bigger the better, this is because when the load fluctuates on a larger time scale, a larger K c It is not conducive to the management of energy storage SOC, and the energy storage may enter a power alarm state during a certain period of time.

[0068] Therefore, this embodiment incorporates the SOC of the energy storage unit into the droop coefficient and proposes a situation-specific energy storage droop control strategy. That is, when the system frequency rises, the energy storage unit needs to be charged. The expression of the second droop coefficient of the energy storage unit is as follows:

[0069]

[0070] Among them, K p is the second droop coefficient, K p,max is the maximum value of the second droop coefficient, SOC is the energy storage charge state, SOC min The minimum SOC value that does not trigger the energy storage unit alarm, SOC ref is the expected value of energy storage SOC, SOC max The maximum SOC value that does not trigger the energy storage alarm.

[0071] According to the above formula, when the energy storage SOC is lower than the expected value, the droop coefficient K p will increase accordingly, allowing the energy storage unit to absorb more active power and enhance its support capacity. On the contrary, the droop coefficient K pIt will decrease, protecting the energy storage SOC from rising too much to ensure that it still has a certain supporting capacity.

[0072] Similarly, when the system frequency decreases, the second droop coefficient is:

[0073]

[0074] For wind turbines, there is no expression similar to the SOC of energy storage. Therefore, an energy state index (SOE) is needed to evaluate the available energy. The kinetic energy stored in the rotating blades of a wind turbine is proportional to the square of the wind turbine speed:

[0075]

[0076] in, is the energy of the i-th fan, is the moment of inertia of the i-th fan, is the angular velocity of the i-th fan.

[0077] Therefore, when the upper and lower limits of the wind turbine angular velocity are given, the WT of the i-th wind turbine in the wind turbine group is i SOE i The expression is:

[0078]

[0079] Among them, SOE i is the energy state of the i-th wind turbine in the wind-solar-storage system, and are the maximum and minimum angular velocity of the i-th fan, is the angular velocity of the i-th fan.

[0080] At this time, the output of the wind turbine generator set at this moment can be represented by SOE, and the third droop coefficient can be selected by SOE. Preferably, this embodiment introduces the differential of the frequency change at this moment to make the active power compensation more accurate. The expression of the active power compensation of the wind turbine generator set is:

[0081]

[0082] in, is the reference value of active power processing of wind turbine generator set, The active power generated by the wind turbine grid connection point, is the differential droop coefficient, K l is the proportional droop coefficient.

[0083] Among them, when the frequency drops and the fan is required to generate additional power, the differential droop coefficient The expression is:

[0084]

[0085] Among them, K d is the differential droop coefficient, SOE is the energy state of the wind turbine, K d,max is the maximum value of the droop coefficient, SOE min is the minimum energy allowed for wind turbines, SOE ref is the standard value of wind turbine energy, SOE max is the maximum allowable energy of the wind turbine.

[0086] Proportional droop coefficient K l The expression is:

[0087]

[0088] Similarly, when the frequency rises and the wind turbines need to reduce their active power processing, The expression is:

[0089]

[0090] Proportional droop coefficient K l The expression is:

[0091]

[0092] For the setting of the first droop coefficient of the supercapacitor terminal voltage, the method adopted in this embodiment is: setting the three-level droop coefficient K t1 , K t2 and K t3 , assuming that the terminal voltage of the supercapacitor when fully charged is U a If the voltage at the supercapacitor terminal is between 0 and 0.4 times U a , and when the system frequency increases, the first droop coefficient adopts a smaller droop coefficient K t1 If the system frequency drops at this time, no compensation will be performed, and a signal will be sent to the energy storage unit to request the energy storage unit to output frequency support to prevent the supercapacitor from running in a power-deficient state. If the supercapacitor terminal voltage at this time is between 0.4 and 0.6 times U a , then the first droop coefficient adopts the normal droop coefficient K t2 If the voltage at the supercapacitor terminal is between 0.6 and 1 times U a , and when the system frequency decreases, the first droop coefficient adopts a larger droop coefficient K t3 If the system frequency rises at this time, no compensation will be performed, and a signal will be sent to the energy storage unit to request the energy storage unit to output power for frequency support to prevent the supercapacitor from overcharging and damage.

[0093] S13. Calculate the total active compensation value of the target wind-solar-storage system according to the first droop coefficient, the second droop coefficient, and the third droop coefficient.

[0094] Since the wind turbine, energy storage unit and supercapacitor jointly output power to compensate for the active power of the target wind-solar-storage system, and the three affect each other, the values ​​may be positive or negative. Therefore, it is necessary to add the three vectors to calculate the total active power compensation that the target wind-solar-storage system can provide.

[0095] S14. When the frequency of the target wind-solar-storage system fluctuates, the total active compensation value when using static reactive power generation equipment is calculated as the first total active compensation value, and the total active compensation value when using automatic power generation equipment is calculated as the second total active compensation value, and active compensation is performed on the target wind-solar-storage system according to the first total active compensation value and the second total active compensation value.

[0096] When the frequency of the target wind, solar and storage system fluctuates, the system will monitor the frequency fluctuation in real time. When the amplitude of the frequency fluctuation reaches the deviation tolerance value, it is determined to be a frequency drop. Due to the long control cycle of the AGC equipment, SVG will first be used to compensate the target wind, solar and storage system for active power to prevent the frequency from collapsing too quickly. When the AGC is started, the SVG will exit operation after receiving the AGC intervention command and enter the standby stage.

[0097] After this, the reference value of the system's active power compensation will be determined jointly by SVG and AGC, specifically:

[0098] Each time the active compensation value is input into the converter, the total active compensation value of the target wind-solar-storage system when SVG is used is calculated as the first total active compensation value; when AGC is used, the other total active compensation value of the target wind-solar-storage system is calculated as the second total active compensation value.

[0099] The first total active compensation value calculated when using SVG is compared with the second total active compensation value calculated when using AGC. If both values ​​are positive or negative, the second total active compensation value corresponding to AGC is used as the reference value to perform active compensation on the target wind-solar-storage system. Otherwise, the first total active compensation value corresponding to SVG is used to perform active compensation on the target wind-solar-storage system.

[0100] The present invention's active power compensation method for a wind, solar, and energy-storage system dynamically adjusts the droop coefficient, enabling flexible configuration of active power compensation strategies based on system frequency fluctuations. During frequency fluctuations, the system rapidly responds and precisely adjusts active power compensation, significantly improving compensation accuracy and ensuring stable operation of the wind, solar, and energy-storage system under varying operating conditions. When system frequency fluctuates, the system intelligently switches compensation devices based on the corresponding active power compensation totals of the SVG and AGC, dynamically adjusting the corresponding total active power compensation values. This improves the flexibility of system active power compensation and enhances the overall operational stability of the wind, solar, and energy-storage system.

[0101] The embodiment of the present invention further provides a wind-solar-storage system active power compensation device, which is used to execute the wind-solar-storage system active power compensation method described above. Figure 2 This is a structural block diagram of an active power compensation device for a wind-solar-storage system according to an embodiment of the present invention. The device includes:

[0102] The data acquisition module 21 is used to obtain the system frequency, supercapacitor terminal voltage, energy storage charge state and wind turbine energy state of the target wind-solar-storage system.

[0103] The coefficient calculation module 22 is used to set a first droop coefficient according to the system frequency and the supercapacitor terminal voltage, set a second droop coefficient according to the system frequency and the energy storage charge state, and set a third droop coefficient according to the system frequency and the wind turbine energy state.

[0104] The compensation calculation module 23 is used to calculate the total active compensation value of the target wind-solar-storage system according to the first droop coefficient, the second droop coefficient and the third droop coefficient.

[0105] The dynamic compensation module 24 is used to calculate the total active compensation value when using static reactive power generation equipment as the first total active compensation value, and calculate the total active compensation value when using automatic power generation equipment as the second total active compensation value when the frequency of the target wind-solar-storage system fluctuates, and perform active compensation on the target wind-solar-storage system according to the first total active compensation value and the second total active compensation value.

[0106] The technical features and technical effects of the device proposed in the embodiment of the present invention are the same as those of the method proposed in the embodiment of the present invention and are not described in detail here. Each module in the above-mentioned device can be implemented in whole or in part by software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software so that the processor can call and execute the operations corresponding to the above modules.

[0107] See also Figure 3, which is a structural block diagram of a computer device provided in an embodiment of the present invention. The computer device provided in an embodiment of the present invention includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the steps in the embodiment of the active power compensation method of the wind-solar-storage system are implemented, for example Figure 1 or, when the processor executes the computer program, the functions of the modules in the above-mentioned device embodiments are realized, such as module 21 to module 24 of the wind-solar-storage system active power compensation device.

[0108] For example, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program in the computer device.

[0109] The computer device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the schematic diagram is merely an example of a computer device and does not limit the computer device. The computer device may include more or fewer components than shown, or a combination of certain components, or different components. For example, the computer device may also include input and output devices, network access devices, buses, etc.

[0110] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the computer device, connecting various parts of the entire computer device using various interfaces and lines.

[0111] The memory can be used to store the computer programs and / or modules. The processor implements the various functions of the computer device by running or executing the computer programs and / or modules stored in the memory and accessing the data stored in the memory. The memory may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (such as a sound playback function or an image playback function); the data storage area may store data generated based on the use of the mobile phone (such as audio data, a phone book, etc.). Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0112] If the module integrated into the computer device is implemented as 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 present invention can also implement all or part of the process steps in the above-mentioned method embodiments by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium.

[0113] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium, and when executed, the program can include the processes in the above-described method embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0114] Accordingly, an embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to perform the steps of the active power compensation method of the wind-solar-storage system as described in the above embodiment, for example Figure 1 Steps S11 to S14 described in .

[0115] In summary, compared with the prior art, the method, apparatus, computer device, and computer-readable storage medium for active power compensation of a wind-solar-storage system provided by the embodiments of the present invention have the following advantages:

[0116] By dynamically adjusting the droop coefficient, the active power compensation strategy can be flexibly set according to changes in system frequency. When the frequency fluctuates, the system can quickly respond and accurately adjust the active power compensation power, significantly improving compensation accuracy and ensuring stable operation of the wind, solar, and energy storage system under different operating conditions. When the system frequency fluctuates, the system intelligently switches compensation devices based on the corresponding active power compensation totals of the SVG and AGC, and dynamically adjusts the corresponding active power compensation totals. This improves the flexibility of the system's active power compensation and enhances the overall operational stability of the wind, solar, and energy storage system.

[0117] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for active power compensation of a wind-solar-storage system, characterized in that: include: Obtain the system frequency, supercapacitor terminal voltage, energy storage charge state and wind turbine energy state of the target wind-solar-storage system; Setting a first droop coefficient according to the system frequency and the supercapacitor terminal voltage, setting a second droop coefficient according to the system frequency and the energy storage charge state, and setting a third droop coefficient according to the system frequency and the energy state of the wind turbine generator set; Calculating the total active power compensation value of the target wind-solar-storage system according to the first droop coefficient, the second droop coefficient, and the third droop coefficient; When the frequency of the target wind, solar and storage system fluctuates, the total active compensation value when using static reactive power generation equipment is calculated as the first total active compensation value, and the total active compensation value when using automatic power generation equipment is calculated as the second total active compensation value. Active compensation is performed on the target wind, solar and storage system according to the first total active compensation value and the second total active compensation value.

2. The method for active power compensation of a wind-solar-storage system according to claim 1, characterized in that: The setting of the second droop coefficient according to the system frequency and the energy storage state of charge includes: Determine the change trend of the system frequency according to the system frequency in continuous time; A second droop coefficient is set according to the change trend.

3. The method for active power compensation of a wind-solar-storage system according to claim 2, wherein: The setting of the second droop coefficient according to the change trend includes: When the change trend is an upward trend, the second droop coefficient is: Among them, K p is the second droop coefficient, K p,max is the maximum value of the second droop coefficient, SOC is the energy storage charge state, SOC min The minimum SOC value that does not trigger the energy storage unit alarm, SOC ref is the expected value of energy storage SOC, SOC max The maximum SOC value that does not trigger the energy storage alarm; When the change trend is a downward trend, the second droop coefficient is: 。 4. The method for active power compensation of a wind-solar-storage system according to claim 1, wherein: The energy state of the wind turbine is: Among them, SOE i is the energy state of the i-th wind turbine in the wind-solar-storage system, and are the maximum and minimum angular velocity of the i-th fan, is the angular velocity of the i-th fan.

5. The method for active power compensation of a wind-solar-storage system according to claim 4, characterized in that: The step of setting a third droop coefficient according to the system frequency and the energy state of the wind turbine generator system includes: Determine the change trend of the system frequency according to the system frequency in continuous time; A third droop coefficient is set according to the change trend.

6. The method for active power compensation of a wind-solar-storage system according to claim 5, characterized in that: The third droop coefficient is composed of a differential droop coefficient and a proportional droop coefficient; The setting of the third droop coefficient according to the change trend includes: When the change trend is an upward trend, the differential droop coefficient is: Among them, K d is the differential droop coefficient, SOE is the energy state of the wind turbine, K d,max is the maximum value of the droop coefficient, SOE min is the minimum energy allowed for wind turbines, SOE ref is the standard value of wind turbine energy, SOE max is the maximum allowed energy of the wind turbine; The proportional droop coefficient is: When the change trend is a downward trend, the differential droop coefficient is: The proportional droop coefficient is: Among them, K l is the proportional droop coefficient.

7. The method for active power compensation of a wind-solar-storage system according to claim 1, wherein: The performing active power compensation on the target wind-solar-storage system according to the first active power compensation total value and the second active power compensation total value includes: If the first total active power compensation value and the second total active power compensation value are both positive or negative, the second total active power compensation value is used to perform active power compensation on the target wind-solar-storage system; Otherwise, the first total active power compensation value is used to perform active power compensation on the target wind-solar-storage system.

8. A wind-solar-storage system active power compensation device, characterized in that: include: A data acquisition module is used to obtain the system frequency, supercapacitor terminal voltage, energy storage charge state and wind turbine energy state of the target wind-solar-storage system; a coefficient calculation module, configured to set a first droop coefficient according to the system frequency and the supercapacitor terminal voltage, set a second droop coefficient according to the system frequency and the energy storage state of charge, and set a third droop coefficient according to the system frequency and the energy state of the wind turbine; a compensation calculation module, configured to calculate a total active compensation value of the target wind-solar-storage system according to the first droop coefficient, the second droop coefficient, and the third droop coefficient; A dynamic compensation module is used to calculate the total active compensation value when using static reactive power generation equipment as the first total active compensation value, and calculate the total active compensation value when using automatic power generation equipment as the second total active compensation value when the frequency of the target wind-solar-storage system fluctuates, and to perform active compensation on the target wind-solar-storage system according to the first total active compensation value and the second total active compensation value.

9. A computer device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for active power compensation of the wind-solar-storage system according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, wherein when the device where the computer-readable storage medium is located executes the computer program, the active power compensation method for the wind-solar-storage system according to any one of claims 1 to 7 is implemented.

Images