Operation control method of fan energy storage system

Abstract

The invention discloses an operation control method for a fan energy storage system, and the method comprises the steps: obtaining power output; the power output is compared with the self-consumption power of the fan energy storage system, and the charging and discharging state of the energy storage equipment is determined; under the condition that it is determined that the energy storage equipment is in the discharging state based on the charging and discharging state, a first control coefficient in the discharging state is determined, a first energy storage power reference value is determined according to the first control coefficient, and the working state of an energy storage converter of the fan energy storage system is controlled based on the first energy storage power reference value; and under the condition that the energy storage equipment is determined to be in the charging state based on the charging and discharging state, a second control coefficient in the charging state is determined, a second energy storage power reference value is determined according to the second control coefficient, and the working state of an energy storage converter of the fan energy storage system is controlled based on the second energy storage power reference value. The problem that the power supply quality is affected due to the fact that the fan energy storage system possibly has power imbalance under variable operation conditions in the prior art is solved.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to an operation control method of a wind turbine energy storage system. Background Art

[0002] As a major component of renewable energy, wind power generation is highly favored for its high efficiency and cleanness. However, the intermittent and unpredictable nature of wind power, especially in the off-grid island operation mode disconnected from the main grid, poses a major challenge to the stability and reliability of the power system. In the island mode, wind farms need to independently balance the supply and demand of electricity, lacking the frequency and voltage support of the main grid, which requires that wind power systems must be equipped with effective energy storage units to smooth the output power and ensure power quality and system stability.

[0003] At present, the coordinated operation strategy of wind power and energy storage systems mainly relies on the configuration of distributed energy storage systems (DESS). For example, by installing a certain capacity (usually about 10% of the rated power of the unit) of energy storage devices in each wind turbine, 1 to 2 hours of power output smoothing can be achieved. However, this solution has obvious limitations: the configuration of energy storage devices is often closely integrated with the hardware of wind turbines, resulting in insufficient system flexibility; in addition, the energy storage control strategy is single and it is difficult to effectively cope with the variable operating conditions in the island mode, especially when the wind speed fluctuates, the system load changes, and the energy storage state changes rapidly, the system may experience power imbalance, affecting the power supply quality.

[0004] Therefore, there is an urgent need for an operation control method of a wind turbine energy storage system to overcome the limitations of the existing technology in off-grid island operation mode and achieve more efficient and stable power supply. Summary of the invention

[0005] The embodiment of the present application provides an operation control method for a wind turbine energy storage system, so as to at least solve the problem in the related art that under variable operating conditions, the wind turbine energy storage system may experience power imbalance, thereby affecting the power supply quality.

[0006] According to one embodiment of the embodiments of the present application, there is provided an operation control method of a wind turbine energy storage system, comprising: obtaining the power output generated by the permanent magnet synchronous generator of the wind turbine energy storage system when the wind turbine of the wind turbine energy storage system is in a working state; comparing the power output with the self-consumption power of the wind turbine energy storage system to determine the charge and discharge state of the energy storage device of the wind turbine energy storage system; in the case where it is determined that the energy storage device is in a discharging state based on the charge and discharge state, determining a first control coefficient in the discharging state, determining a first energy storage power reference value according to the first control coefficient, and controlling the working state of the energy storage converter of the wind turbine energy storage system based on the first energy storage power reference value; in the case where it is determined that the energy storage device is in a charging state based on the charge and discharge state, determining a second control coefficient in the charging state, determining a second energy storage power reference value according to the second control coefficient, and controlling the working state of the energy storage converter of the wind turbine energy storage system based on the second energy storage power reference value.

[0007] In an exemplary embodiment, the power output is compared with the self-consumption power of the wind turbine energy storage system to determine the charge and discharge state of the energy storage device of the wind turbine energy storage system, including: when the power output is less than the self-consumption power, determining that the energy storage device of the wind turbine energy storage system is in a discharging state; when the power output is greater than or equal to the self-consumption power, determining that the energy storage device of the wind turbine energy storage system is in a charging state.

[0008] In an exemplary embodiment, when it is determined that the energy storage device is in a discharging state based on the charge and discharge state, determining the first control coefficient in the discharging state includes: when it is determined that the energy storage device is in a discharging state based on the charge and discharge state, determining the remaining power of the energy storage device; comparing the remaining power with a set remaining power threshold to obtain a first comparison result, and determining a first initial control coefficient according to the first comparison result; and determining the first control coefficient in the discharging state according to the first initial control coefficient.

[0009] In an exemplary embodiment, the remaining power threshold includes a first remaining power threshold, a second remaining power threshold, and a third remaining power threshold; wherein the first remaining power threshold is less than the second remaining power threshold, and the second remaining power threshold is less than the third remaining power threshold; the remaining power is compared with the set remaining power threshold to obtain a first comparison result, and a first initial control coefficient is determined according to the first comparison result, including: when the remaining power is less than 0 and less than or equal to the first remaining power threshold, the first initial control coefficient is determined based on a preset maximum discharge rate; when the remaining power is greater than the second remaining power threshold and less than or equal to the third remaining power threshold, the first initial control coefficient is determined based on the remaining power, the second remaining power threshold, the third remaining power threshold and the maximum discharge rate; when the remaining power is greater than the third remaining power threshold, the value of the first initial control coefficient is determined to be 0.

[0010] In an exemplary embodiment, when it is determined that the energy storage device is in a charging state based on the charge and discharge state, a second control coefficient is determined in the charging state, a second energy storage power reference value is determined according to the second control coefficient, and the working state of the energy storage converter of the wind turbine energy storage system is controlled based on the second energy storage power reference value, including: when it is determined that the energy storage device is in a charging state based on the charge and discharge state, the remaining power of the energy storage device is determined; the remaining power is compared with a set remaining power threshold to obtain a second comparison result, and a second initial control coefficient is determined according to the second comparison result; and the second control coefficient in the discharge state is determined according to the second initial control coefficient.

[0011] In an exemplary embodiment, the remaining power threshold includes a fourth remaining power threshold, a fifth remaining power threshold, and a sixth remaining power threshold; wherein the fourth remaining power threshold is less than the fifth remaining power threshold, and the fifth remaining power threshold is less than the sixth remaining power threshold; the remaining power is compared with the set remaining power threshold to obtain a second comparison result, and a second initial control coefficient is determined according to the second comparison result, including: when the remaining power is greater than the sixth remaining power threshold and less than or equal to 1, the second initial control coefficient is determined based on a preset maximum discharge rate; when the remaining power is greater than the fifth remaining power threshold and less than or equal to the sixth remaining power threshold, the second initial control coefficient is determined based on the remaining power, the fifth remaining power threshold, the sixth remaining power threshold and the maximum discharge rate; when the remaining power is greater than 0 and less than or equal to the fourth remaining power threshold, the value of the second initial control coefficient is determined to be 0.

[0012] In an exemplary embodiment, the method further includes: when it is determined that the energy storage device is in a charging state based on the charge and discharge state, determining whether the power output is greater than a target energy storage power of the energy storage device; when the power output is greater than the target energy storage power of the energy storage device, adjusting the wind energy utilization coefficient of the wind turbine based on the pitch angle of the wind turbine, and adjusting the working state of the wind turbine based on the adjusted wind energy utilization coefficient.

[0013] According to another embodiment of the embodiments of the present application, a wind turbine energy storage system is also provided, which includes at least a wind turbine, a permanent magnet synchronous generator, a machine-side converter, an energy storage converter and an energy storage device, wherein one end of the wind turbine is connected to one end of the permanent magnet synchronous generator, the other end of the permanent magnet synchronous generator is connected to one end of the machine-side converter, the other end of the machine-side converter is connected to one end of the energy storage converter, and the other end of the energy storage converter is connected to one end of the energy storage device.

[0014] According to another embodiment of the embodiment of the present application, there is also provided an operation control device of a wind turbine energy storage system, comprising: an acquisition module, used to acquire the power output generated by the permanent magnet synchronous generator of the wind turbine energy storage system when the wind turbine of the wind turbine energy storage system is in a working state; a comparison module, used to compare the power output with the self-consumption power of the wind turbine energy storage system to determine the charge and discharge state of the energy storage device of the wind turbine energy storage system; a first control module, used to determine a first control coefficient in the discharge state when it is determined that the energy storage device is in a discharge state based on the charge and discharge state, determine a first energy storage power reference value according to the first control coefficient, and control the working state of the energy storage converter of the wind turbine energy storage system based on the first energy storage power reference value; a second control module, used to determine a second control coefficient in the charging state when it is determined that the energy storage device is in a charging state based on the charge and discharge state, determine a second energy storage power reference value according to the second control coefficient, and control the working state of the energy storage converter of the wind turbine energy storage system based on the second energy storage power reference value.

[0015] According to another aspect of the embodiments of the present application, a computer-readable storage medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the above method when running.

[0016] According to another aspect of the embodiments of the present application, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the method through the computer program.

[0017] According to another aspect of the embodiments of the present application, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0018] In an embodiment of the present application, the charging and discharging state of the energy storage device is determined by comparing the power output of the permanent magnet synchronous generator with the self-consumption power of the wind turbine energy storage system. Further, when the energy storage device is in a discharging state, the discharging process of the energy storage converter can be controlled by determining a first energy storage power reference value in the discharging state. And when the energy storage device is in a charging state, the charging process of the energy storage converter can be controlled by determining a second energy storage power reference value in the charging state, thereby ensuring the power balance of the wind turbine energy storage system in the off-grid island operation mode, maintaining the healthy state of the wind turbine energy storage system, and enabling the wind turbine energy storage system to achieve effective power balance and optimal energy utilization in the off-grid island operation mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 It is a hardware structure block diagram of a computer terminal of an operation control method of a wind turbine energy storage system according to an embodiment of the present application;

[0021] Figure 2 is a flow chart of an operation control method of a wind turbine energy storage system according to an embodiment of the present application;

[0022] Figure 3 is a structural block diagram of a wind turbine energy storage system according to an embodiment of the present application;

[0023] Figure 4 is a control flow block diagram of a motor-side converter according to an embodiment of the present application;

[0024] Figure 5 is a flowchart of an operation control method of a wind turbine energy storage system according to an embodiment of the present application;

[0025] Figure 6 is another flowchart of the operation control method of the wind turbine energy storage system according to an embodiment of the present application;

[0026] Figure 7 It is a structural block diagram of an operation control device of a wind turbine energy storage system according to an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices; "plurality" means two or more.

[0029] The method embodiments provided in the embodiments of the present application can be executed in a computer terminal or similar computing device or cloud platform or independent physical server or software platform, wherein the above software platform is run through one or more servers. Taking running on a computer terminal as an example, Figure 1 is a hardware structure block diagram of an operation control method of a wind turbine energy storage system according to an embodiment of the present application. Figure 1 As shown, the computer terminal may include one or more ( Figure 1 Only one is shown in the figure) processor 102 and memory 104 for storing data. In an exemplary embodiment, the computer terminal may also include a transmission device 106 for communication functions and an input and output device 108, wherein the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA. A person skilled in the art can understand that Figure 1 The structure shown is only for illustration and does not limit the structure of the above-mentioned computer terminal. Figure 1 More or fewer components as shown, or with Figure 1 Equivalent functions or comparisons shown Figure 1 A different configuration with more features is shown.

[0030] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as computer programs corresponding to the methods in the embodiments of the present application. The processor 102 executes various functional applications and data processing by running the computer programs stored in the memory 104, that is, the above-mentioned methods are implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0031] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of a computer terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0032] In this embodiment, a method for controlling the operation of a wind turbine energy storage system is provided, which is applied to the above-mentioned computer device. Figure 2 : is a flow chart of an operation control method of a wind turbine energy storage system according to an embodiment of the present application, the flow chart includes the following steps:

[0033] Step S202, obtaining the power output generated by the permanent magnet synchronous generator of the wind turbine energy storage system when the wind turbine of the wind turbine energy storage system is in a working state;

[0034] It should be noted that the embodiments of the present application are directed to the control of the wind turbine energy storage system in an off-grid island operation mode. Off-grid island operation refers to an operation mode in which the wind turbines and their associated energy storage systems (such as battery energy storage systems) in the wind farm operate independently after the wind farm is disconnected from the main power grid to meet the power demand of the internal load or nearby loads of the wind farm. In this mode, the wind farm needs to self-manage and adjust to ensure a stable supply of electricity and a stable system frequency.

[0035] In some embodiments, when there is no wind or the wind speed in the wind farm is less than the starting wind speed of the wind turbine, the wind turbine does not work and is in a stationary state; when there is wind and the wind speed is greater than the starting wind speed of the wind turbine, the wind turbine is in a working state.

[0036] Step S204, comparing the power output with the self-consumption power of the wind turbine energy storage system to determine the charge and discharge state of the energy storage device of the wind turbine energy storage system;

[0037] Step S206, when it is determined based on the charge and discharge state that the energy storage device is in a discharge state, determining a first control coefficient in the discharge state, determining a first energy storage power reference value according to the first control coefficient, and controlling the working state of the energy storage converter of the wind turbine energy storage system based on the first energy storage power reference value;

[0038] Step S208, when it is determined that the energy storage device is in a charging state based on the charge and discharge state, determine a second control coefficient in the charging state, determine a second energy storage power reference value according to the second control coefficient, and control the working state of the energy storage converter of the wind turbine energy storage system based on the second energy storage power reference value.

[0039] In an embodiment of the present application, the charging and discharging state of the energy storage device is determined by comparing the power output of the permanent magnet synchronous generator with the self-consumption power of the wind turbine energy storage system. Further, when the energy storage device is in a discharging state, the discharging process of the energy storage converter can be controlled by determining a first energy storage power reference value in the discharging state. And when the energy storage device is in a charging state, the charging process of the energy storage converter can be controlled by determining a second energy storage power reference value in the charging state, thereby ensuring the power balance of the wind turbine energy storage system in the off-grid island operation mode, maintaining the healthy state of the wind turbine energy storage system, and enabling the wind turbine energy storage system to achieve effective power balance and optimal energy utilization in the off-grid island operation mode.

[0040] In an exemplary embodiment, the power output is compared with the self-consumption power of the wind turbine energy storage system to determine the charge and discharge state of the energy storage device of the wind turbine energy storage system, including: when the power output is less than the self-consumption power, determining that the energy storage device of the wind turbine energy storage system is in a discharging state; when the power output is greater than or equal to the self-consumption power, determining that the energy storage device of the wind turbine energy storage system is in a charging state.

[0041] Among them, the power output of the generator is collected in real time through sensors installed on the permanent magnet synchronous generator (PMSG). This data reflects the actual power generation capacity under the current wind conditions. At the same time, the self-consumption power of the wind turbine energy storage system is monitored, that is, the power consumed by the internal equipment of the wind farm (such as control systems, lighting systems, etc.). This step ensures that the system can fully consider its own power needs to achieve accurate energy balance.

[0042] The collected generator power output is compared with the self-consumption power of the wind turbine energy storage system in real time to determine whether the current system is self-sufficient or whether there is an energy surplus or shortage. If the power output is less than the self-consumption power, it means that wind power generation is not enough to support the power consumption within the wind farm. At this time, the power system determines that the energy storage device needs to enter the discharge state. The energy storage device begins to release the stored electrical energy to supplement the power demand within the system and ensure a continuous and stable power supply. If the power output is greater than or equal to the self-consumption power, it means that the wind power generation at least meets or exceeds the consumption within the system, and there is an energy surplus. The system then determines that the energy storage device should enter the charging state. At this time, the excess energy will be stored in the energy storage device for use in subsequent wind shortages, so as to achieve reasonable allocation and utilization of energy.

[0043] In the above embodiments, through real-time monitoring and intelligent decision-making, the charging and discharging state of the energy storage device can be accurately adjusted to achieve efficient coordinated operation of wind power and the energy storage system, especially under the complex conditions of off-grid island operation of wind farms, which can significantly improve the stability and self-sufficiency of the system and achieve optimal management and configuration of energy.

[0044] In an exemplary embodiment, when it is determined that the energy storage device is in a discharging state based on the charge and discharge state, determining the first control coefficient in the discharging state includes: when it is determined that the energy storage device is in a discharging state based on the charge and discharge state, determining the remaining power of the energy storage device; comparing the remaining power with a set remaining power threshold to obtain a first comparison result, and determining a first initial control coefficient according to the first comparison result; and determining the first control coefficient in the discharging state according to the first initial control coefficient.

[0045] Among them, in the discharge state, it is first necessary to monitor the SOC state of the energy storage device in real time, that is, the current charge level of the battery. This is crucial because the SOC directly reflects the available energy of the energy storage device and its health status during the discharge process. Through the built-in battery management system (BMS), the system can obtain the battery's charge status in real time, including information such as the current voltage, current and temperature of the battery, and then calculate the remaining power. Compare the current SOC value with the preset remaining power threshold. This threshold is set based on the self-consumption power demand of the wind farm, the performance of the energy storage equipment, and the safety and reliability requirements of the system operation. The comparison result will determine whether the discharge rate needs to be adjusted and how to adjust it.

[0046] After the initial control coefficient is determined, it is necessary to further adjust it according to the actual operating conditions to optimize the discharge process. For example, if a sudden increase in external load is detected, the first control coefficient may need to be temporarily increased to increase the discharge rate to meet the additional power demand. On the contrary, if the wind is detected to be stronger, the generator output power exceeds the self-consumption power, and the SOC is high, the first control coefficient may need to be reduced to slow down the discharge rate and save more energy for the subsequent possible wind speed drop or load increase.

[0047] It is understandable that the determination of the first control coefficient is a dynamic process, and the first control coefficient can be continuously adjusted according to the real-time SOC, wind turbine power generation, external load changes and other information to ensure that the discharge process of the energy storage device not only meets the system requirements, but also remains within a healthy and safe range. By accurately controlling the discharge rate of the energy storage device, the present invention can effectively reduce the voltage and frequency fluctuations of the system caused by power imbalance, and improve the system stability in the off-grid island operation mode. On the basis of ensuring the stability of the system, the control strategy can also maximize the use of wind energy resources, avoid wasting energy when the wind is sufficient, and rationally use the energy stored in the energy storage device when the wind is insufficient, so as to achieve efficient and sustainable use of energy.

[0048] In the above embodiments, when the energy storage device is in a discharging state, the control strategy can be intelligently adjusted to ensure the coordinated operation of the wind power and energy storage system, optimize energy distribution, improve energy utilization efficiency, and ensure the stability and safety of the system.

[0049] In an exemplary embodiment, the remaining power threshold includes a first remaining power threshold, a second remaining power threshold, and a third remaining power threshold; wherein the first remaining power threshold is less than the second remaining power threshold, and the second remaining power threshold is less than the third remaining power threshold; the remaining power is compared with the set remaining power threshold to obtain a first comparison result, and a first initial control coefficient is determined according to the first comparison result, including: when the remaining power is less than 0 and less than or equal to the first remaining power threshold, the first initial control coefficient is determined based on a preset maximum discharge rate; when the remaining power is greater than the second remaining power threshold and less than or equal to the third remaining power threshold, the first initial control coefficient is determined based on the remaining power, the second remaining power threshold, the third remaining power threshold and the maximum discharge rate; when the remaining power is greater than the third remaining power threshold, the value of the first initial control coefficient is determined to be 0.

[0050] It should be noted that in the control strategy for the coordinated operation of wind power and energy storage systems, the setting of the remaining power threshold and the adjustment of the control coefficient based on these thresholds are key mechanisms to ensure system stability and efficient energy utilization. Specifically for the control under the discharge state, the remaining power threshold is divided into three levels: the first remaining power threshold, the second remaining power threshold and the third remaining power threshold, and there is an increasing relationship between them, that is, the first remaining power threshold < the second remaining power threshold < the third remaining power threshold. The discharge control logic based on these thresholds will be explained in detail below:

[0051] When the remaining power is greater than 0, and less than or equal to the first remaining power threshold, it indicates that the power state of the energy storage device is close to or lower than the set minimum power threshold, that is, the SOC of the energy storage device is seriously lower than the normal working range, and there is a risk of over-discharge. In such a case, emergency measures should be taken to avoid further damage to the energy storage device while ensuring the power supply of critical loads. At this time, the first initial control coefficient will be determined based on the preset maximum discharge rate to ensure that the stored electrical energy can be released at a safe rate even in a low power state. This usually means that the first initial control coefficient is relatively high, so that it can respond quickly to system needs when the power is extremely low, and at the same time, it will not let the battery enter an absolutely "empty" power state to avoid damaging the battery.

[0052] When the remaining power is greater than the second remaining power threshold, and less than or equal to the third remaining power threshold: it indicates that the energy storage device is in a higher power state within the normal working range, but has not yet reached full charge. At this time, the first initial control coefficient can be adjusted more finely according to the actual situation of the remaining power, as well as the second remaining power threshold and the third remaining power threshold. Specifically, the first initial control coefficient will be dynamically calculated based on the proximity of the remaining power to the second remaining power threshold, the third remaining power threshold, and the maximum discharge rate. The purpose of this strategy is to optimize the discharge efficiency of the energy storage device while ensuring stable power supply to the system, avoid unnecessary over-discharge or overcharging, and extend battery life. In this way, energy release can be managed more intelligently to cope with changing wind power generation and load demands.

[0053] When the remaining power is greater than the third remaining power threshold, the power of the energy storage device is close to or has reached its maximum capacity. At this time, continued discharge will be unnecessary and may result in energy waste. Therefore, the system sets the value of the first initial control coefficient to 0, completely stops the discharge of the energy storage device to prevent energy loss caused by excessive discharge, and reserves energy storage space for subsequent possible wind power reduction or load increase. This mechanism ensures that when energy is sufficient, the energy storage device can remain fully charged or nearly fully charged, providing the system with the ability to respond quickly when energy is short or demand increases.

[0054] In some embodiments, after the first initial control coefficient is determined, the first initial control coefficient may be directly determined as the first control coefficient, or the first initial control coefficient may be multiplied by a certain ratio to obtain the first control coefficient.

[0055] In the above embodiment, by comparing the remaining power with the preset remaining power threshold, the first initial control coefficient is dynamically adjusted to ensure that the discharge process of the energy storage device meets the system requirements and remains within the range of safety and efficiency. A reasonable discharge strategy ensures the stability of the system under different power states, especially in the island operation mode, when the wind farm is disconnected from the main power grid, this strategy can provide fast and reliable power support and enhance the system's ability to respond to emergencies.

[0056] In an exemplary embodiment, when it is determined that the energy storage device is in a charging state based on the charge and discharge state, a second control coefficient is determined in the charging state, a second energy storage power reference value is determined according to the second control coefficient, and the working state of the energy storage converter of the wind turbine energy storage system is controlled based on the second energy storage power reference value, including: when it is determined that the energy storage device is in a charging state based on the charge and discharge state, the remaining power of the energy storage device is determined; the remaining power is compared with a set remaining power threshold to obtain a second comparison result, and a second initial control coefficient is determined according to the second comparison result; and the second control coefficient in the discharge state is determined according to the second initial control coefficient.

[0057] In an exemplary embodiment, the remaining power threshold includes a fourth remaining power threshold, a fifth remaining power threshold, and a sixth remaining power threshold; wherein the fourth remaining power threshold is less than the fifth remaining power threshold, and the fifth remaining power threshold is less than the sixth remaining power threshold; the remaining power is compared with the set remaining power threshold to obtain a second comparison result, and a second initial control coefficient is determined according to the second comparison result, including: when the remaining power is greater than the sixth remaining power threshold and less than or equal to 1, the second initial control coefficient is determined based on a preset maximum discharge rate; when the remaining power is greater than the fifth remaining power threshold and less than or equal to the sixth remaining power threshold, the second initial control coefficient is determined based on the remaining power, the fifth remaining power threshold, the sixth remaining power threshold and the maximum discharge rate; when the remaining power is greater than 0 and less than or equal to the fourth remaining power threshold, the value of the second initial control coefficient is determined to be 0.

[0058] It should be noted that when the remaining power is greater than the sixth remaining power threshold and is less than or equal to 1: This indicates that the power of the energy storage device is close to its maximum capacity, but has not yet been fully charged. In this state, the system should take measures to prevent the battery from overcharging to avoid increased battery internal resistance, decreased battery performance, and shortened battery life. To achieve this goal, the second initial control coefficient is determined based on the preset maximum charging rate, but will be appropriately reduced to charge slowly until the maximum capacity is reached. The adjustment mechanism of this coefficient ensures that when the battery is close to full charge, the charging rate slows down, which not only avoids overcharging, but also makes full use of the remaining charging capacity.

[0059] When the remaining power is greater than the fifth remaining power threshold and less than or equal to the sixth remaining power threshold: this means that the battery is in a relatively fully charged state within the normal operating range, but there is still room for charging and discharging. At this time, the second initial control coefficient will be dynamically determined based on the remaining power, the five remaining power thresholds, the sixth remaining power threshold, and the maximum discharge rate. This process is designed to optimize the battery's charging and discharging efficiency, ensuring that the battery does not frequently switch between low and high power states, thereby reducing the number of times the battery is charged and discharged and extending the battery life.

[0060] When the remaining power is greater than 0 and less than or equal to the fourth remaining power threshold: This situation indicates that the battery power is low and may be close to or in its minimum safe operating range. In order to prevent system instability and battery damage caused by the battery entering a low power state, the value of the second initial control coefficient should be set to 0, and the charging mode or low power operation mode should be entered to restore the battery power as soon as possible. This mechanism gives priority to battery charging when the battery power is low, avoiding the power system from falling into an unstable state due to insufficient energy storage.

[0061] In the above embodiments, by setting and comparing different remaining power thresholds, the control strategy of the present invention can intelligently adjust the charge and discharge rates of the energy storage device, which not only improves the operating efficiency and reliability of the wind power and energy storage system, but also effectively extends the service life of the battery by optimizing the charging and discharging process, reduces operation and maintenance costs, and improves the overall economic benefits and environmental friendliness of the system.

[0062] In an exemplary embodiment, the method further includes: when it is determined that the energy storage device is in a charging state based on the charge and discharge state, determining whether the power output is greater than a target energy storage power of the energy storage device; when the power output is greater than the target energy storage power of the energy storage device, adjusting the wind energy utilization coefficient of the wind turbine based on the pitch angle of the wind turbine, and adjusting the working state of the wind turbine based on the adjusted wind energy utilization coefficient.

[0063] It should be noted that after determining that the energy storage device is in a charging state, the real-time power output of the wind turbine will be further compared with the target energy storage power of the energy storage device. The target energy storage power refers to the maximum power that the energy storage device can safely receive and store at the current SOC level. This comparison is to ensure that the power output of the wind turbine does not exceed the range that the energy storage device can effectively absorb, avoiding energy waste or unnecessary pressure on the energy storage device.

[0064] When the power output is indeed greater than the target energy storage power, it means that the wind turbine is generating more electricity than the system needs. At this time, the wind turbine pitch angle will be adjusted to change the wind energy utilization factor to reduce the wind turbine power output and match it with the receiving capacity of the energy storage system. Pitch angle adjustment principle: By adjusting the pitch angle, the wind turbine can change the wind capture area of ​​the blades, thereby affecting the utilization rate of wind energy. When it is necessary to reduce the power output, the pitch angle will be increased, so that the wind capture area of ​​the blades will be reduced, the wind energy utilization factor will decrease, and the power output of the wind turbine will also decrease. Wind energy utilization factor adjustment: The wind energy utilization factor is a key factor in the power output of the wind turbine. After the pitch angle is adjusted, the wind energy utilization factor will be recalculated to ensure that the wind turbine can maintain a high efficiency while reducing the power output. In this way, even at high wind speeds, the wind energy capture can be flexibly adjusted to maintain stable and efficient operation.

[0065] Based on the adjusted wind energy utilization factor, the working state of the wind turbine will be readjusted, including but not limited to its rated speed, output power and other parameters. This adjustment process is designed to ensure that the output power of the wind turbine is compatible with the system demand and the charging capacity of the energy storage device, while avoiding excessive burden on the wind turbine and the energy storage device. For example, when the output power of the wind turbine decreases after adjustment, the system may adjust the rated speed of the generator accordingly to maintain its efficiency at the optimal operating point.

[0066] In order to better understand the process of the operation control method of the above-mentioned wind turbine energy storage system, the operation control method of the above-mentioned wind turbine energy storage system is described below in combination with an optional embodiment, but it is not used to limit the technical solution of the embodiment of the present application. The operation control method of the wind turbine energy storage system of the present application is implemented based on the wind turbine energy storage system, refer to Figure 3 As shown in Figure 1, the wind turbine energy storage system includes a wind turbine, a permanent magnet synchronous generator (PMSG), a machine-side converter, and an energy storage converter (i.e. Figure 3The energy storage bidirectional DC converter in the wind turbine) and the energy storage device (BESS), and also include a grid-side converter (the grid-side converter function is not considered during island operation). Among them, one end of the wind turbine is connected to one end of the permanent magnet synchronous generator, the other end of the permanent magnet synchronous generator is connected to one end of the machine-side converter, the other end of the machine-side converter is connected to one end of the energy storage converter, and the other end of the energy storage converter is connected to one end of the energy storage device. Figure 3 In the process, both the software and hardware equipment of the wind turbine need to be modified. The energy storage device of a single wind turbine has a smaller capacity, occupies less space, has a longer service life, and is easy to install inside the unit. The output of the energy storage converter is directly connected to the DC bus of the converter, with a dual system integrated design, fewer system components, low manufacturing cost and high efficiency.

[0067] For a wind turbine, the aerodynamic characteristics of the wind turbine show that the mechanical output power of the wind turbine is:

[0068]

[0069] Where ρ is the air density, R is the radius of the wind wheel, v is the wind speed, and C p is the wind energy utilization coefficient, is the tip speed ratio, θ is the pitch angle. Wind energy utilization coefficient C p is a function of λ and θ. The tip speed ratio λ is ω r is the wind turbine rotor speed. The Betz theory proves that the upper limit of the wind energy utilization coefficient is 0.593. When the pitch angle remains unchanged, as long as the optimal blade tip speed ratio is kept constant according to the wind turbine speed, C can be maintained. p =C p,max , at this time the wind turbine obtains maximum wind energy.

[0070] For PMSG, in synchronous rotating coordinates, the voltage equation of the permanent magnet synchronous generator (PMSG) is:

[0071]

[0072] The magnetic flux equation is:

[0073]

[0074] The torque equation is:

[0075]

[0076] In the formula, u sd 、u sq is the motor d and q axis output voltage, i sd 、isq is the d and q axis armature current, L d , L q is the d-axis and q-axis inductance of the stator winding, is the d-axis and q-axis magnetic flux, ω e is the point angular frequency, is the permanent magnet flux.

[0077] For wind power converters, the functions of the generator-side converter are: 1) rectifying the alternating current with varying frequency and voltage amplitude emitted by the permanent magnet synchronous generator into direct current; 2) controlling the speed of the wind turbine to achieve maximum wind energy capture; 3) controlling the reactive exchange with the permanent magnet synchronous generator.

[0078] The control flow diagram of the motor side converter is as follows: Figure 4 As shown, it includes collecting grid current, dq transformation, and multiple PI controllers. By collecting grid current, dq transformation is performed on the d axis and q axis respectively. The dq transformation is used to convert the three-phase AC input into a DC signal to obtain ω e L d , which is convenient for subsequent control. And the fan rotor speed ω r , and the fan rotor reference speed ω ref Input to the PI controller to get u sd and u sq . Finally, the difference between the actual active power output of the generator and the reference active power output of the generator is compared. The reference value of the q-axis current can be obtained through the PI controller. The d-axis is used to control the operating state of the generator, and the control method of id=0 can be used. Including generator speed, grid current, reference signal, etc.

[0079] The BESS energy storage system has the characteristics of fast response and flexible configuration of power and battery capacity. Compared with other batteries, lithium batteries have higher energy density, better energy storage capacity, more cycles, and more environmentally friendly materials. The mathematical expression of lithium batteries in charging mode and discharging mode is:

[0080]

[0081] Where U ch , U disch is the no-load voltage of the battery, U0 is the rated voltage, R ch is the polarization resistance, Q max is the maximum capacity of the micro battery, i * is the low frequency current, i t is the actual available capacity of the battery, A is the amplitude of the exponential region, and B is the inverse of the time constant at which the exponential approaches.

[0082] The open circuit voltage of a lithium battery is related to its own residual circuit, and its residual power is represented by SOC. The expression of SOC and voltage source control quantity is:

[0083]

[0084] In the formula, Q r is the battery capacity, C max is the total capacity of the battery, E0 is the internal potential, Q e is the discharge amount. Lithium battery energy storage is electrochemical energy storage, which is applied to the DC side through a bidirectional DC-DC converter. The DC / DC bidirectional converter is the key to the BESS system to achieve bidirectional flow of electric energy. The charge and discharge control of the energy storage battery adopts the voltage and current loop closed-loop control technology, and PI regulators are used. The main goal of the voltage loop is to achieve real-time control of the voltage value, track the reference value as much as possible, and achieve constant voltage control. The main goal of the current loop is to achieve real-time control of the current value, reduce the actual current value fluctuation, and enhance the system's dynamic response capability.

[0085] The wind farm is separated from the main grid, the wind turbine energy storage operates independently, and the system enters the island operation mode when the self-consumption such as unit maintenance and attitude control is independently powered. The control block diagram of the island operation with only wind turbines and energy storage batteries is as follows: Figure 5 As shown: The input is the rotor speed of the generator ω r , and then get P MPPT , that is, power data, by MPPT With P 自耗电 (i.e. self-consumption power) to determine whether the energy storage device is charging or discharging, or neither charging nor discharging. In the state of charging or discharging, the energy storage SOC value is set to 4 critical points, namely SOC min , SOC low , SOC high , SOC max , and then determine the control coefficient, that is, the first control coefficient and the second control coefficient. When not charging and not discharging, directly set Kw (the third control coefficient) to start the control of the motor-side converter. When SOC is in different states, parameters need to be adjusted according to the charging and discharging mode to form an adaptive control method for energy storage charging and discharging.

[0086] When the battery is charging, if SOC∈(0,SOC min ], the battery power is seriously insufficient, and the first droop control coefficient is:

[0087] K S1 =-K S，max

[0088] Among them, K s1 is the first droop control coefficient, K s,max is the set maximum discharge rate.

[0089] If SOC∈(SOC high ,SOC max ], in order to ensure the frequency modulation effect and battery SOC balance, the parameters are adjusted as follows:

[0090]

[0091] If SOC∈(SOC max ,1], at this time the battery is charged to the limit state and charging stops, that is:

[0092] K S1 =0

[0093] When the battery is discharged, if SOC∈(SOC low ,1], the battery power is sufficient, and the second droop control coefficient is:

[0094] K S2 =K S，max

[0095] If SOC∈(SOC min ,SOC low ], in order to ensure the frequency modulation effect and battery SOC balance, the parameters are adjusted as follows:

[0096]

[0097] If SOC∈(0,SOC min ], at this time the battery is discharged to the limit state and stops discharging, that is:

[0098] K S2 =0

[0099] The first control coefficient K during island operation charging and discharging S3 , the second control coefficient K S4 The first lower control coefficient K of the frequency modulation process S1 , the second droop control coefficient K S2 Has a certain proportional relationship:

[0100] K S3 =γK S1 , K S4 =γK S2

[0101] In the formula, γ is the proportionality coefficient.

[0102] refer to Figure 6As shown in the figure, it is a block diagram of the operation control flow of the wind turbine energy storage system, which is as follows: When v<=vcut_in, that is, there is no wind or the wind speed is less than the starting wind speed of the wind turbine, the wind turbine energy storage system does not work, and is in a stationary state. When there is wind and the wind speed is greater than the starting wind speed of the wind turbine, the maximum power P output on the stator side MPPT Greater than or equal to P 自耗电 , and is less than the maximum input power P that the energy storage can accept SC,max At this time, the energy storage device is in the charging state, the wind turbine energy storage system is in the maximum power tracking state of wind energy and supplies power to the battery; determine the second control coefficient K in the charging state S3 , according to the second control coefficient K S3 Determine a second energy storage power reference value PS_ref, and control the working state of the energy storage converter of the wind turbine energy storage system based on the second energy storage power reference value. The formula is as follows: PS_ref = K S3 (PSC,max-P MPPT +P 自耗电 );K S3 =γK S1 .

[0103] On the other hand, when there is wind and the wind speed is greater than the starting wind speed of the wind turbine, the maximum power output on the stator side is P MPPT Greater than or equal to self-consumption P 自耗电 , and P MPPT >P SC,max At this time, the energy storage is in a saturated state, and the system can adopt pitch angle control to reduce the wind energy utilization coefficient; that is, based on the pitch angle of the wind turbine, the wind energy utilization coefficient of the wind turbine is adjusted, and based on the adjusted wind energy utilization coefficient, the working state of the wind turbine is adjusted. W_ref (Wind power reference value) = P MPPT -K W (P SC,max -P MPPT +P 自耗电 );

[0104] On the other hand, when there is wind and the wind speed is greater than the starting wind speed of the wind turbine, the maximum power output on the stator side is P MPPT <P 自耗电， That is, it is not enough to support self-consumption, the energy storage device is in a discharging state, and the wind turbine energy storage system is in a maximum power tracking state of wind energy. At this time, the first control coefficient in the discharging state is determined, and the first energy storage power reference value is determined according to the first control coefficient, and the working state of the energy storage converter of the wind turbine energy storage system is controlled based on the first energy storage power reference value; when the energy storage device reaches the maximum discharge depth, the energy storage device stops working and is in a protection state. The specific formula is as follows: P S_ref (First energy storage power reference value) = K S4 (First control coefficient)(PMPPT -P 自耗电 );K S4 =γ(set ratio)*K S2 .

[0105] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods of each embodiment of the present application.

[0106] The present application also provides a structural block diagram of an operation control device for a wind turbine energy storage system. Figure 7 is a structural block diagram of an operation control device of a wind turbine energy storage system according to an embodiment of the present application; Figure 7 As shown, including:

[0107] An acquisition module 702 is used to acquire the power output generated by the permanent magnet synchronous generator of the wind turbine energy storage system when the wind turbine of the wind turbine energy storage system is in a working state;

[0108] A comparison module 704, used to compare the power output with the self-consumption power of the wind turbine energy storage system to determine the charge and discharge state of the energy storage device of the wind turbine energy storage system;

[0109] A first control module 706 is used to determine a first control coefficient in the discharge state when it is determined that the energy storage device is in a discharge state based on the charge and discharge state, determine a first energy storage power reference value according to the first control coefficient, and control the working state of the energy storage converter of the wind turbine energy storage system based on the first energy storage power reference value;

[0110] The second control module 708 is used to determine a second control coefficient in the charging state when it is determined that the energy storage device is in a charging state based on the charging and discharging state, determine a second energy storage power reference value according to the second control coefficient, and control the working state of the energy storage converter of the wind turbine energy storage system based on the second energy storage power reference value.

[0111] Through the above-mentioned device, the charging and discharging state of the energy storage device is determined by comparing the power output of the permanent magnet synchronous generator with the self-consumption power of the wind turbine energy storage system. Further, when the energy storage device is in a discharging state, the discharging process of the energy storage converter can be controlled by determining the first energy storage power reference value in the discharging state. And when the energy storage device is in a charging state, the charging process of the energy storage converter can be controlled by determining the second energy storage power reference value in the charging state, thereby ensuring the power balance of the wind turbine energy storage system in the off-grid island operation mode, maintaining the healthy state of the wind turbine energy storage system, and enabling the wind turbine energy storage system to achieve effective power balance and optimal energy utilization in the off-grid island operation mode.

[0112] In an exemplary embodiment, the comparison module 704 is also used to determine that the energy storage device of the wind turbine energy storage system is in a discharging state when the power output is less than the self-consumption power; and to determine that the energy storage device of the wind turbine energy storage system is in a charging state when the power output is greater than or equal to the self-consumption power.

[0113] In an exemplary embodiment, the first control module 706 is also used to determine the remaining power of the energy storage device when it is determined that the energy storage device is in a discharging state based on the charging and discharging state; compare the remaining power with a set remaining power threshold to obtain a first comparison result, and determine a first initial control coefficient according to the first comparison result; and determine the first control coefficient in the discharging state according to the first initial control coefficient.

[0114] In an exemplary embodiment, the remaining power threshold includes a first remaining power threshold, a second remaining power threshold, and a third remaining power threshold; wherein the first remaining power threshold is less than the second remaining power threshold, and the second remaining power threshold is less than the third remaining power threshold; the first control module 706 is also used to determine a first initial control coefficient based on a preset maximum discharge rate when the remaining power is greater than 0 and less than or equal to the first remaining power threshold; when the remaining power is greater than the second remaining power threshold and less than or equal to the third remaining power threshold, determine the first initial control coefficient based on the remaining power, the second remaining power threshold, the third remaining power threshold and the maximum discharge rate; when the remaining power is greater than the third remaining power threshold, determine the value of the first initial control coefficient to be 0.

[0115] In an exemplary embodiment, the second control module 708 is also used to determine the remaining power of the energy storage device when it is determined that the energy storage device is in a charging state based on the charging and discharging state; compare the remaining power with a set remaining power threshold to obtain a second comparison result, and determine a second initial control coefficient according to the second comparison result; and determine the second control coefficient in the discharge state according to the second initial control coefficient.

[0116] In an exemplary embodiment, the remaining power threshold includes a fourth remaining power threshold, a fifth remaining power threshold, and a sixth remaining power threshold; wherein the fourth remaining power threshold is less than the fifth remaining power threshold, and the fifth remaining power threshold is less than the sixth remaining power threshold; the second control module 708 is also used to determine a second initial control coefficient based on a preset maximum discharge rate when the remaining power is greater than the sixth remaining power threshold and less than or equal to 1; when the remaining power is greater than the fifth remaining power threshold and less than or equal to the sixth remaining power threshold, determine the second initial control coefficient based on the remaining power, the fifth remaining power threshold, the sixth remaining power threshold and the maximum discharge rate; when the remaining power is greater than 0 and less than or equal to the fourth remaining power threshold, determine the value of the second initial control coefficient to be 0.

[0117] In an exemplary embodiment, the device also includes an adjustment module; the adjustment module is used to determine whether the power output is greater than the target energy storage power of the energy storage device when it is determined that the energy storage device is in a charging state based on the charging and discharging state; when the power output is greater than the target energy storage power of the energy storage device, the wind energy utilization coefficient of the wind turbine is adjusted based on the pitch angle of the wind turbine, and the working state of the wind turbine is adjusted based on the adjusted wind energy utilization coefficient.

[0118] An embodiment of the present application further provides a storage medium, which includes a stored program, wherein the program executes any of the above methods when it is run.

[0119] Optionally, in this embodiment, the storage medium may be configured to store program codes for executing the following steps:

[0120] S1, obtaining the power output generated by the permanent magnet synchronous generator of the wind turbine energy storage system when the wind turbine of the wind turbine energy storage system is in a working state;

[0121] S2, comparing the power output with the self-consumption power of the wind turbine energy storage system to determine the charge and discharge state of the energy storage device of the wind turbine energy storage system;

[0122] S3, when it is determined that the energy storage device is in a discharging state based on the charging and discharging state, determining a first control coefficient in the discharging state, determining a first energy storage power reference value according to the first control coefficient, and controlling the working state of the energy storage converter of the wind turbine energy storage system based on the first energy storage power reference value;

[0123] S4, when it is determined that the energy storage device is in a charging state based on the charge and discharge state, determine a second control coefficient in the charging state, determine a second energy storage power reference value according to the second control coefficient, and control the working state of the energy storage converter of the wind turbine energy storage system based on the second energy storage power reference value.

[0124] An embodiment of the present application further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0125] Optionally, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0126] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0127] S1, obtaining the power output generated by the permanent magnet synchronous generator of the wind turbine energy storage system when the wind turbine of the wind turbine energy storage system is in a working state;

[0128] S2, comparing the power output with the self-consumption power of the wind turbine energy storage system to determine the charge and discharge state of the energy storage device of the wind turbine energy storage system;

[0129] S3, when it is determined that the energy storage device is in a discharging state based on the charging and discharging state, determining a first control coefficient in the discharging state, determining a first energy storage power reference value according to the first control coefficient, and controlling the working state of the energy storage converter of the wind turbine energy storage system based on the first energy storage power reference value;

[0130] S4, when it is determined that the energy storage device is in a charging state based on the charge and discharge state, determine a second control coefficient in the charging state, determine a second energy storage power reference value according to the second control coefficient, and control the working state of the energy storage converter of the wind turbine energy storage system based on the second energy storage power reference value.

[0131] Optionally, in this embodiment, the above-mentioned storage medium may include but is not limited to: a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk, and other media that can store program codes.

[0132] An embodiment of the present application further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps in any one of the above method embodiments are implemented.

[0133] An embodiment of the present application further provides another computer program product, including a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0134] An embodiment of the present application also provides a computer program, which includes computer instructions stored in a computer-readable storage medium; a processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the steps in any one of the above method embodiments.

[0135] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation modes, and this embodiment will not be described in detail here.

[0136] Obviously, those skilled in the art should understand that the above modules or steps of the present application can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that herein, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.

[0137] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for controlling the operation of a wind turbine energy storage system, characterized in that: include: Obtaining the power output generated by the permanent magnet synchronous generator of the wind turbine energy storage system when the wind turbine of the wind turbine energy storage system is in a working state; Compare the power output with the self-consumption power of the wind turbine energy storage system to determine the charge and discharge state of the energy storage device of the wind turbine energy storage system; In the case where it is determined that the energy storage device is in a discharging state based on the charging and discharging state, determining a first control coefficient in the discharging state, determining a first energy storage power reference value according to the first control coefficient, and controlling the working state of the energy storage converter of the wind turbine energy storage system based on the first energy storage power reference value; When it is determined that the energy storage device is in a charging state based on the charge and discharge state, a second control coefficient in the charging state is determined, a second energy storage power reference value is determined according to the second control coefficient, and the working state of the energy storage converter of the wind turbine energy storage system is controlled based on the second energy storage power reference value.

2. The method according to claim 1, characterized in that The comparing the power output with the self-consumption power of the wind turbine energy storage system to determine the charge and discharge state of the energy storage device of the wind turbine energy storage system includes: When the power output is less than the self-consumption power, determining that the energy storage device of the wind turbine energy storage system is in a discharging state; When the power output is greater than or equal to the self-consumption power, it is determined that the energy storage device of the wind turbine energy storage system is in a charging state.

3. The method according to claim 1, characterized in that In the case where it is determined based on the charge and discharge state that the energy storage device is in a discharge state, determining a first control coefficient in the discharge state includes: In a case where it is determined based on the charge and discharge status that the energy storage device is in a discharging state, determining a remaining amount of power of the energy storage device; Comparing the remaining power with a set remaining power threshold to obtain a first comparison result, and determining a first initial control coefficient according to the first comparison result; A first control coefficient in the discharge state is determined according to the first initial control coefficient.

4. The method according to claim 3, characterized in that: The remaining power threshold includes a first remaining power threshold, a second remaining power threshold, and a third remaining power threshold; wherein the first remaining power threshold is less than the second remaining power threshold, and the second remaining power threshold is less than the third remaining power threshold; The comparing the remaining power with a set remaining power threshold to obtain a first comparison result, and determining a first initial control coefficient according to the first comparison result, includes: When the remaining power is greater than 0 and less than or equal to the first remaining power threshold, determining a first initial control coefficient based on a preset maximum discharge rate; When the remaining power is greater than the second remaining power threshold and less than or equal to the third remaining power threshold, determining the first initial control coefficient based on the remaining power, the second remaining power threshold, the third remaining power threshold and the maximum discharge rate; When the remaining power is greater than the third remaining power threshold, the value of the first initial control coefficient is determined to be 0.

5. The method according to claim 1, characterized in that In the case where it is determined that the energy storage device is in a charging state based on the charge and discharge state, determining a second control coefficient in the charging state, determining a second energy storage power reference value according to the second control coefficient, and controlling the working state of the energy storage converter of the wind turbine energy storage system based on the second energy storage power reference value, including: In a case where it is determined based on the charge and discharge status that the energy storage device is in a charging state, determining the remaining power of the energy storage device; Comparing the remaining power with a set remaining power threshold to obtain a second comparison result, and determining a second initial control coefficient according to the second comparison result; The second control coefficient in the discharge state is determined according to the second initial control coefficient.

6. The method according to claim 5, characterized in that The remaining power threshold includes a fourth remaining power threshold, a fifth remaining power threshold, and a sixth remaining power threshold; wherein the fourth remaining power threshold is smaller than the fifth remaining power threshold, and the fifth remaining power threshold is smaller than the sixth remaining power threshold; The comparing the remaining power with a set remaining power threshold to obtain a second comparison result, and determining a second initial control coefficient according to the second comparison result, includes: When the remaining power is greater than the sixth remaining power threshold and less than or equal to 1, determining a second initial control coefficient based on a preset maximum discharge rate; When the remaining power is greater than the fifth remaining power threshold and less than or equal to the sixth remaining power threshold, determining the second initial control coefficient based on the remaining power, the fifth remaining power threshold, the sixth remaining power threshold and the maximum discharge rate; When the remaining power is greater than 0 and less than or equal to the fourth remaining power threshold, the value of the second initial control coefficient is determined to be 0.

7. The method according to claim 1, characterized in that The method further comprises: In a case where it is determined based on the charge and discharge status that the energy storage device is in a charging state, determining whether the power output is greater than a target energy storage power of the energy storage device; When the power output is greater than the target energy storage power of the energy storage device, the wind energy utilization coefficient of the wind turbine is adjusted based on the pitch angle of the wind turbine, and the working state of the wind turbine is adjusted based on the adjusted wind energy utilization coefficient.

8. A wind turbine energy storage system, characterized in that: The wind turbine energy storage system at least includes a wind turbine, a permanent magnet synchronous generator, a machine-side converter, an energy storage converter and an energy storage device, wherein one end of the wind turbine is connected to one end of the permanent magnet synchronous generator, the other end of the permanent magnet synchronous generator is connected to one end of the machine-side converter, the other end of the machine-side converter is connected to one end of the energy storage converter, and the other end of the energy storage converter is connected to one end of the energy storage device.

9. An operation control device for a wind turbine energy storage system, characterized in that: include: An acquisition module, used for acquiring the power output generated by the permanent magnet synchronous generator of the wind turbine energy storage system when the wind turbine of the wind turbine energy storage system is in working state; A comparison module, used to compare the power output with the self-consumption power of the wind turbine energy storage system to determine the charge and discharge state of the energy storage device of the wind turbine energy storage system; a first control module, for determining a first control coefficient in the discharge state when the energy storage device is determined to be in the discharge state based on the charge and discharge state, and The first control coefficient determines a first energy storage power reference value, and controls the working state of the energy storage converter of the wind turbine energy storage system based on the first energy storage power reference value; The second control module is used to determine a second control coefficient in the charging state when it is determined that the energy storage device is in a charging state based on the charging and discharging state, determine a second energy storage power reference value according to the second control coefficient, and control the working state of the energy storage converter of the wind turbine energy storage system based on the second energy storage power reference value.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the method described in any one of claims 1 to 7 when executed.

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