Control method of energy storage system, wind power plant and computer device

Abstract

The application provides a control method of an energy storage system, a wind power station and a computer device. The control method comprises the following steps: obtaining power generated by a wind power generator, power required by grid dispatching and power consumed by a station load; when the power generated by the wind power generator is greater than the sum of the power required by the grid dispatching and the power consumed by the station load, generating a first control instruction, the first control instruction being used for controlling the wind power generator to transmit electric energy to the energy storage system; and when the power generated by the wind power generator is less than or equal to the sum of the power required by the grid dispatching and the power consumed by the station load, generating a second control instruction, the second control instruction being used for controlling the energy storage system to transmit electric energy to the station load.

Description

Technical Field

[0001] This application relates to the field of wind and energy storage joint control, and in particular to a control method for an energy storage system, a wind farm, and computer equipment. Background Technology

[0002] Energy storage systems, as a crucial component of wind farms, play a vital role in improving the power generation efficiency of wind turbines, maintaining the safe and stable operation of the power grid, and addressing the mismatch between power supply and demand. However, energy storage systems face the dual challenges of rapid cell performance degradation and shortened lifespan. Performance degradation means reduced equipment energy efficiency, severely impacting the economic benefits and stable, safe operation of wind farms. Shortened lifespan means the need for regular replacement of energy storage systems, increasing the operation and maintenance costs of wind farms. Summary of the Invention

[0003] One of the technical problems this application aims to solve is to ensure that the energy storage system is in a healthy working state under different conditions, thereby reducing equipment wear and extending its service life.

[0004] To address the aforementioned technical problems, embodiments of this application provide a control method for an energy storage system, a wind farm, and computer equipment.

[0005] This application provides a control method for an energy storage system. The control method includes: acquiring the power generation of a wind power generation device, the power required for grid dispatch, and the power consumption of the power station load; when the power generation of the wind power generation device is greater than the sum of the grid dispatch command and the power consumption of the power station load, generating a first control command, which is used to control the wind power generation device to transmit electrical energy to the energy storage system; when the power generation of the wind power generation device is less than or equal to the sum of the grid dispatch command and the power consumption of the power station load, generating a second control command, which is used to control the energy storage system to transmit electrical energy to the power station load.

[0006] In some embodiments, when the power generation of the wind power generation device is greater than the sum of the grid dispatch command and the power consumption of the power station load, the control method further includes: calculating the system power redundancy, where the system power redundancy is the difference between the power generation of the wind power generation device and the sum of the power required by the grid dispatch and the power consumption of the power station load; when the system power redundancy is greater than the minimum charging power of the energy storage system, generating a first control command; when the system power redundancy is greater than the minimum charging power of the energy storage system, generating a third control command, whereby the third control command is used to indicate that the energy storage system is in standby mode.

[0007] In some embodiments, the first control command carries the charging power of the energy storage system; when the system power redundancy is less than or equal to the maximum charging power of the energy storage system, and SOC≤SOCmax-Plimit×ΔT / 60, the charging power Pcharge=Plimit of the energy storage system, where SOC is the state of charge of the energy storage system, SOCmax is the maximum value of the state of charge of the energy storage system, Plimit is the system power redundancy, and ΔT is the scheduling period; when the system power redundancy is less than or equal to the maximum charging power of the energy storage system, and SOC>SOCmax-Plimit×ΔT / 60, and SOC≤SOCmax-Pmincharge×ΔT / 60, the charging power Pcharge=(SOCmax-SOC)×60 / ΔT, where Pmincharge is the minimum charging power of the energy storage system; when the system power redundancy is greater than the maximum charging power of the energy storage system, and SOC≤SOCmax-Pmaxcharge×ΔT / 60, the charging power Pcharge=Pmaxcharge, where Pmaxcharge is the maximum charging power of the energy storage system.

[0008] In some embodiments, before calculating the system power redundancy, the control method further includes: confirming that the power generation of the wind power generation device is greater than the energy storage charging start threshold during off-peak hours and the energy storage charging start threshold during peak hours.

[0009] In some embodiments, when the power generation of the wind power generation device is less than or equal to the sum of the grid dispatch command and the power consumption of the power station load, the control method further includes: confirming the current time period of the energy storage system; generating a second control command or a third control command based on the electricity price corresponding to the current time period of the energy storage system, as well as the power generation of the wind power generation device and the power consumption demand of the power station load, wherein the third control command is used to instruct the energy storage system to be in standby mode.

[0010] In some embodiments, when the power generation of the wind power generation device is less than the power demand of the power station load, and the electricity price corresponding to the current time period of the energy storage system is higher than the first electricity price threshold, a second control command is generated; when the power generation of the wind power generation device is less than the power demand of the power station load, and the electricity price corresponding to the current time period of the energy storage system is lower than or equal to the first electricity price threshold, a third control command is generated.

[0011] In some embodiments, confirming the current time period of the energy storage system further includes: if the standard deviation between the electricity price and its average value during the current time period is less than a first threshold and the duration is greater than a second threshold, and the median of the electricity price corresponding to the current time period is less than a valley price setting threshold, then the current time period is a valley price period; if the standard deviation between the electricity price and its average value during the current time period is less than the first threshold and the duration is greater than the second threshold, and the median of the electricity price corresponding to the current time period is greater than a peak price setting threshold, then the current time period is a peak price period; if the standard deviation between the electricity price and its average value during the current time period is less than the first threshold and the duration is greater than the second threshold, and the median of the electricity price corresponding to the current time period is greater than a valley price setting threshold and less than a peak price setting threshold, then the current time period is a parity period.

[0012] In some embodiments, the control method further includes: when the power generation of the wind power generation device is greater than the power demand of the power station load and the current time period is a parity period or a peak period, generating a fourth control command, the fourth control command being used to control the energy storage system to transmit power to the grid.

[0013] This application provides a wind farm station, which includes: a controller, and wind power generation devices, an energy storage system, a power grid, and a station load, all connected to the controller. The energy storage system supplies power to the power grid and the station load. The controller is configured to: acquire the power generation of the wind power generation devices, the power required for grid dispatch, and the power consumption of the station load; generate a first control command when the power generation of the wind power generation devices is greater than the sum of the grid dispatch command and the power consumption of the station load, the first control command being used to control the wind power generation devices to transmit electrical energy to the energy storage system; and generate a second control command when the power generation of the wind power generation devices is less than or equal to the sum of the grid dispatch command and the power consumption of the station load, the second control command being used by the energy storage system to transmit electrical energy to the station load.

[0014] This application provides a computer device, including a processor and a memory storing a computer program. When the processor executes the program, it implements the method provided in the above embodiments.

[0015] This application provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of any of the above-described energy storage system control methods.

[0016] Through the aforementioned technical methods, the energy storage system control method, wind farm, and computer equipment provided in this application precisely control the charging and discharging process of the energy storage system by determining whether the power generation of the wind power generation device can meet the power requirements of the power grid dispatch and the power consumption of the farm load. This ensures that the energy storage is in a healthy working state under different operating conditions, reduces equipment wear and tear, and extends its service life. Simultaneously, it optimizes the energy utilization of the wind farm, reduces energy waste, and allows for flexible responses to electricity price fluctuations and changes in market demand, maximizing the use of peak-valley price differences, improving the economic efficiency of the wind farm, and reducing operating costs. Attached Figure Description

[0017] To more clearly illustrate the technical methods in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of a wind farm disclosed in an embodiment of this application;

[0019] Figure 2 This is a flowchart illustrating the control method of the energy storage system disclosed in the embodiments of this application;

[0020] Figure 3 This is a flowchart illustrating the control method disclosed in another embodiment of this application;

[0021] Figure 4 This is a flowchart illustrating the control method disclosed in another embodiment of this application;

[0022] Figure 5 This is a flowchart illustrating the control method disclosed in another embodiment of this application;

[0023] Figure 6 This is a schematic diagram of the structure of a computer device disclosed in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures:

[0025] 110. Controller; 120. Wind power generation device; 130. Energy storage system; 140. Power grid; 150. Station load; 501. Processor; 502. Communication interface; 503. Memory; 504. Communication bus. Detailed Implementation

[0026] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application. This application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical methods falling within the scope of the claims.

[0027] These embodiments are provided to make the application thorough and complete, and to fully express the scope of the application to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions and values ​​illustrated in these embodiments should be interpreted as merely exemplary and not as limiting.

[0028] Furthermore, the terms "including" or "comprising" as used in this application mean that the element preceding the word covers the element listed after the word, and do not exclude the possibility that it may also cover other elements.

[0029] It should also be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0030] All terms used in this application have the same meaning as understood by one of ordinary skill in the art to which this application pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as having idealized or highly formalized meanings, unless expressly defined herein.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0032] This application provides a wind farm station, such as Figure 1 As shown, the wind farm includes: a controller 110, and a wind power generation device 120, an energy storage system 130, a power grid 140, and a farm load 150, which are respectively connected to the controller 110. The energy storage system 130 is used to supply power to the power grid 140 and the farm load 150.

[0033] The controller 110 may include one or more processing units, such as an application processor (AP), a modem processor, a digital signal processor (DSP), a baseband processor, and / or a neural network processing unit (NPU). These different processing units may be independent devices or integrated into one or more controllers 110. The controller 110 can generate operation control signals based on the instruction opcode and timing signals to control instruction fetching and execution.

[0034] The controller 110 may also include a memory for storing instructions and data, such as instructions for controlling the charging or discharging of the energy storage system 130. In some embodiments, the memory in the controller 110 is a cache memory, which can store instructions or data that the controller 110 has just used or that are used repeatedly. If the controller 110 needs to use the instruction or data again, it can directly retrieve it from the memory. This avoids repeated accesses, reduces the waiting time of the controller 110, and thus improves the efficiency of the system.

[0035] The wind turbine in the wind power generation device 120 rotates under the influence of wind, converting the kinetic energy of the wind into mechanical energy. Specifically, the wind turbine can convert low-speed mechanical energy into high-speed rotation through a gearbox, driving a generator to operate, and then the generator converts the mechanical energy into electrical energy. The generated electrical energy is stepped up by a transformer and then transmitted to the power grid 140 or supplied to users. However, because changes in wind speed can cause instability in the power generation of the wind power generation device 120, it needs to be used in conjunction with an energy storage system 130.

[0036] Energy storage system 130 typically includes devices such as batteries and flywheels to store excess electrical energy and release it when needed. Because wind power generation is intermittent, when wind power generation device 120 generates excess power, energy storage system 130 can store the excess electricity, reducing the impact on the power grid 140. When wind power generation device 120 generates insufficient power, energy storage system 130 can provide additional power to balance the load on the power grid 140. Thus, by regulating the timing of power generation and consumption, energy storage system 130 can improve the stability and reliability of the power grid 140.

[0037] Power grid 140 is a system that connects power plants to users, including transmission lines, substations, and distribution networks. Power grid 140 is responsible for transmitting the electricity generated by wind farms to end users, and also provides power to the wind farm loads 150.

[0038] Electric load refers to the electricity demand within a wind farm, including the power consumption of control systems, wind turbine operation, lighting, and other auxiliary equipment.

[0039] As mentioned above, when the power generation of the wind turbine 120 exceeds the grid 140's absorption capacity, the energy storage system 130 can effectively store excess wind power, avoiding energy waste, and release electricity during peak electricity demand periods to alleviate the pressure on the grid 140. Furthermore, facing high grid electricity prices, the energy storage system 130, through intelligent scheduling and optimized charging and discharging strategies, ensures that the power demand of the wind farm load 150 is met when the wind turbine 120's power generation is insufficient, significantly reducing the wind farm's operating costs. However, the energy storage system 130 faces the dual challenges of rapid cell performance degradation and shortened lifespan. Performance degradation means decreased equipment energy efficiency, severely impacting the wind farm's economic benefits and stable, safe operation. Shortened lifespan means the energy storage system 130 needs regular replacement, increasing the wind farm's operation and maintenance costs.

[0040] In view of this, embodiments of this application provide a control method for an energy storage system 130, such as... Figure 2 As shown, this control method can be applied to the controller 110 in a wind farm. The control method includes: S10: acquiring the power generation of the wind power generation device 120, the power required for grid dispatch 140, and the power consumption of the farm load 150; S11: when the power generation of the wind power generation device 120 is greater than the sum of the grid dispatch command and the power consumption of the farm load 150, a first control command is generated, which is used to control the wind power generation device 120 to transmit electrical energy to the energy storage system 130; when the power generation of the wind power generation device 120 is less than or equal to the sum of the grid dispatch command and the power consumption of the farm load 150, a second control command is generated, which is used by the energy storage system 130 to transmit electrical energy to the farm load 150.

[0041] The control method provided in this application precisely controls the charging and discharging process of the energy storage system 130 by determining whether the power generation of the wind power generation device 120 can meet the power requirements of the grid dispatch 140 and the power consumption of the wind farm load 150. Specifically, when the power generation of the wind power generation device 120 is greater than the sum of the grid dispatch command and the power consumption of the wind farm load 150, it means that the power generation of the wind power generation device 120 can meet the power supply demand, and the energy storage system 130 can start charging; otherwise, the energy storage system 130 starts discharging. This ensures that the energy storage is in a healthy working state under different operating conditions, reduces equipment wear and tear, and extends its service life. At the same time, it can also optimize the energy utilization of the wind farm, reduce energy waste, and make flexible responses to electricity price fluctuations and changes in market demand, maximizing the use of peak-valley price differences, improving the economic benefits of the wind farm, and reducing operating costs.

[0042] This application embodiment also provides a control method for an energy storage system 130, which can be applied to a controller 110 in a wind farm. The control method includes the following steps:

[0043] Step S20: Confirm peak price period, valley price period, and flat price period.

[0044] In a specific example, step S20 includes: Step S201: Obtain historical transaction electricity price data, which includes electricity price data recorded by hour, day, and month, which can provide data support for analyzing the level, volatility, and duration of electricity prices.

[0045] Step S202: Set peak price thresholds and valley price thresholds according to the level, volatility, and duration of electricity prices, and divide the peak price period, valley price period, and flat price period.

[0046] For example, the median electricity price over a historical period can be used to determine whether the price is high or low; the standard deviation between the historical price and its average can be used to determine price volatility; and the duration of each price level can be calculated by statistically analyzing the specific length of time each price level lasts. Therefore, based on the price level, volatility, and duration, a peak price threshold can be set as the lowest price during peak hours, a valley price threshold as the highest price during valley hours, and a parity price threshold as the lowest price during peak hours and the highest price during valley hours.

[0047] Step S21: Determine the current time period.

[0048] In a specific example, if the standard deviation between the current electricity price and its average value is less than a first threshold, and the duration is greater than a second threshold, and the median electricity price is less than the off-peak price threshold, then the current time period is an off-peak price period; if the standard deviation between the current electricity price and its average value is less than a first threshold, and the duration is greater than a second threshold, and the median electricity price is greater than the peak price threshold, then the current time period is a peak price period; if the standard deviation between the current electricity price and its average value is less than a first threshold, and the duration is greater than a second threshold, and the median electricity price is greater than the off-peak price threshold and less than the peak price threshold, then the current time period is a parity price period.

[0049] Therefore, the charging of the energy storage system 130 can be controlled according to the electricity price corresponding to each time period. For example, when the wind farm is in a low-price period, the system can maximize the absorption and storage of excess wind power to reduce wind curtailment. At the same time, it can compensate for the insufficient reserve power caused by the large discharge of the energy storage system 130 during peak price periods, providing more redundant power for the power consumption of the farm load 150. The specific steps are as follows:

[0050] like Figure 3As shown, step S300 involves obtaining the available generating power (Pavailable) of the wind farm, the power required for grid dispatch (PAGC) 140, the state of charge (SOC) of the energy storage system 130, the maximum discharge power (Pmaxdischarge) of the energy storage system 130, the minimum discharge power (Pmindischarge) of the energy storage system 130, the maximum charging power (Pmaxcharge) of the energy storage system 130, the minimum charging power (Pmincharge) of the energy storage system 130, the dispatch period ΔT (min), the maximum SOC value (SOCmax) and the minimum SOC value (SOCmin) of the energy storage system 130, and the power consumption (Pload) of the wind farm load 150.

[0051] Step S301: Determine whether the current wind farm is in a system power redundancy state. System power redundancy means Pavailable > PAGC + Pload. If so, calculate the wind farm system power redundancy value Plimit = Pavailable - PAGC - Pload. The control method executed by the energy storage system 130 includes the following steps:

[0052] Step S302: Determine whether the current time period of the wind farm is a valley price or a par price period. If yes, proceed to step S303; otherwise, proceed to step S309.

[0053] Step S303: Determine whether the available power generation Pavailable of the wind farm is greater than the first-level start threshold for energy storage charging during off-peak and grid parity periods. If yes, proceed to step S304; otherwise, the energy storage system 130 is in standby mode.

[0054] Step S304: Determine whether the power redundancy value Plimit < Pmincharge of the wind farm system is true. If so, Plimit is too low, the charging function of the energy storage system 130 cannot be effectively activated, the charging efficiency is low, the energy storage works in standby mode, and the actual power generated by the wind farm Pwind = PAGC.

[0055] Step S305: Determine whether Pmincharge≤Plimit≤Pmaxcharge is true. If yes, Plimit meets the charging and discharging power requirements of energy storage system 130, and proceed to step S306. Otherwise, if Plimit is too high and is completely absorbed by energy storage system 130, it will cause overload of internal components of energy storage system 130, increase the risk of thermal runaway, accelerate the aging of energy storage system 130, and shorten its service life. Therefore, energy storage system 130 needs to operate with limited power, and proceed to step S308.

[0056] Step S306: Determine if the state of charge (SOC) of the energy storage system 130 within a scheduling cycle is SOC ≤ SOCmax - Plimit × ΔT / 60. If so, the energy storage system 130 meets the system power redundancy charging requirements, and the energy storage system starts charging mode. The charging power is Pcharge = Plimit, and the actual generated power of the wind farm is Pwind = Pavailable.

[0057] Step S307: Determine if the state of charge (SOC) of the energy storage system 130 within a scheduling cycle is SOC ≤ SOCmax - Pmincharge × ΔT / 60. If so, the energy storage system 130 meets the low-power charging requirements, the energy storage system starts charging mode, and the charging power Pcharge = (SOCmax - SOC) / (ΔT / 60). The wind farm operates with limited power, and the actual generated power Pwind = PAGC + Pcharge + Pload. Otherwise, the energy storage system 130 does not meet the low-power charging requirements, the energy storage system 130 operates in standby mode, the wind farm operates with limited power, and the actual generated power Pwind = PAGC + Pload.

[0058] Step S308: Determine if the state of charge (SOC) of the energy storage system 130 within a scheduling cycle is SOC ≤ SOCmax - Pmaxcharge × ΔT / 60. If so, the energy storage system 130 meets the maximum power charging requirement, and the energy storage system 130 starts the charging mode with charging power Pcharge = Pmaxcharge. The wind farm operates with limited power and the actual generated power Pwind = PAGC + Pcharge + Pload. Otherwise, proceed to step S307.

[0059] Step S309: Determine if Pavailable > the first-level start threshold for energy storage charging during peak price period. If yes, proceed with steps S303-S308; otherwise, put the energy storage system 130 into standby mode.

[0060] Because charging during off-peak periods results in a higher State of Charge (SOC) for the energy storage system 130 during peak periods, the first-level charging threshold for energy storage during peak periods is set higher than that during off-peak periods to avoid frequent switching between charging and discharging of the energy storage system 130 during peak periods.

[0061] In some specific embodiments, in step S301 above, after determining that the wind farm is not in a system power redundancy state, the discharge of the energy storage system 130 can be controlled according to the electricity price corresponding to each time period. Considering that directly purchasing electricity from the grid during periods of insufficient wind resources would result in high electricity costs, the wind farm should prioritize meeting its internal electricity demand during periods of wind scarcity, reducing the pressure on the grid 140 to send electricity back to the grid. Simultaneously, during peak electricity price periods, the energy storage system 130 will leverage its "energy transfer" value, increasing the wind farm's electricity sales revenue through discharge to the grid. The specific steps are as follows:

[0062] like Figure 4 As shown, step S401: Determine whether the current time period of the wind farm is in a valley price period. If yes, proceed to step S402; otherwise, proceed to step S409.

[0063] Step S402: Determine whether the available generating power Pavailable of the wind farm is greater than or equal to the power consumption Pload of the farm's load 150. If so, the energy storage operates in standby mode, and the actual generating power Pwind = Pavailable of the wind farm. Otherwise, the actual generating power of the wind farm cannot meet the farm's power load demand, calculate the shortfall power Plack = Pload - Pavailable, and proceed to step S403.

[0064] Step S403: Determine whether the current grid electricity price is lower than the set threshold. If so, purchase electricity from the grid 140 to supply the power load demand of the power station, and the energy storage system 130 operates in standby mode. Otherwise, proceed to step S404.

[0065] Step S404: Determine whether the calculated deficit power Plack is less than the minimum discharge power Pmindischarge of the energy storage system 130. If so, the Plack is too low, the discharge function of the energy storage system 130 cannot be effectively activated, the discharge efficiency is low, the energy storage works in standby mode, and the insufficient field power is supplemented by purchased grid power.

[0066] Step S405: Determine if Pmindischarge≤Plack≤Pmaxdischarge. If yes, Plack meets the 130 discharge power requirement of the energy storage system, and proceed to step S406. Otherwise, if Plack is too high, the 130 discharge of the energy storage system cannot fully cover the power load demand of the site. Therefore, the insufficient power supply for the site is supplemented by purchasing power from the grid, and proceed to step S408.

[0067] Step S406: Determine the state of charge (SOC) of energy storage system 130 within a scheduling cycle: SOC ≥ SOCmin + Plack × ΔT / 60. If so, energy storage system 130 meets the requirement for discharging the shortfall in electricity, and the energy storage system starts the discharge mode. The discharge power Pdischarge = Plack, and the actual generated power of the wind farm Pwind = Pavailable.

[0068] Step S407: Determine the state of charge (SOC) of energy storage system 130 within a scheduling cycle: SOC ≥ SOCmin + Pmindischarge × ΔT / 60. If so, energy storage system 130 meets the low-power discharge requirement, and the energy storage system starts the discharge mode. The discharge power Pdischarge = (SOC - SOCmin) / (ΔT / 60). At this time, the insufficient power consumption at the site is supplemented by purchasing grid power. The purchased grid power Pgird = Plack - Pdischarge. Otherwise, energy storage system 130 does not meet the low-power discharge requirement, and energy storage system 130 operates in standby mode. The insufficient power consumption at the site is supplemented by purchasing grid power.

[0069] Step S408: Determine if the state of charge (SOC) of energy storage system 130 within a scheduling cycle is greater than or equal to SOCmin + Pmaxdischarge × ΔT / 60. If so, energy storage system 130 meets the maximum discharge power requirement, and the energy storage system starts the discharge mode with a discharge power of Pdischarge = Pmaxdischarge. The insufficient power consumption at the site is supplemented by purchasing power from the grid. Otherwise, proceed to step S407.

[0070] In step S401 above, as Figure 5 As shown, if it is determined that the current time period of the wind farm is not during a price off-peak period, the following steps should be performed:

[0071] Step S409: Calculate the power deficit required for dispatching 140 meters from the power grid under the condition of insufficient system power: PlackAGC = Pload + PAGC - Pavailable.

[0072] Step S410: Determine whether the available power generation Pavailable of the wind farm is greater than or equal to the power consumption Pload of the farm load 150. If yes, proceed to step S411; otherwise, proceed to step S403.

[0073] Step S411: Determine whether the available power generation Pavailable of the wind farm is less than the first-level start-up threshold of energy storage discharge during the period of grid parity and peak price. If yes, proceed to step S412; otherwise, the energy storage system 130 is in standby mode.

[0074] Step S412: Determine whether the deficit power PlackAGC is less than the minimum discharge power Pmindischarge of the energy storage system 130. If so, the PlackAGC is too low, the discharge function of the energy storage system 130 cannot be effectively activated, the discharge efficiency is low, and the energy storage works in standby mode.

[0075] Step S413: Determine if Pmindischarge≤PlackAGC≤Pmaxdischarge. If yes, PlackAGC meets the discharge power requirement of the energy storage system 130 and execute step S414. Otherwise, if PlackAGC is too high, the discharge of the energy storage system 130 cannot fully cover the power deficit required for dispatching the power 140 from the grid, and instruct step S416.

[0076] Step S414: Determine if the state of charge (SOC) of the energy storage system 130 within a scheduling cycle is greater than or equal to SOCmin + PlackAGC × ΔT / 60. If so, the energy storage system 130 discharges to meet the power requirements of the grid 140 scheduling, and the energy storage system starts the discharge mode with a discharge power of Pdischarge = PlackAGC.

[0077] Step S415: Determine if the state of charge (SOC) of the energy storage system 130 within a scheduling cycle is greater than or equal to SOCmin + Pmindischarge × ΔT / 60. If so, the energy storage system 130 can discharge at low power, which does not meet the power requirements for fully covering the grid 140 scheduling. The energy storage system starts the discharge mode, and the discharge power Pdischarge = (SOC - SOCmin) / (ΔT / 60). Otherwise, the energy storage system 130 does not meet the low power discharge requirements and operates in standby mode.

[0078] Step S416: Determine if the state of charge (SOC) of the energy storage system 130 within a scheduling cycle is greater than or equal to SOCmin + Pmaxdischarge × ΔT / 60. If so, the energy storage system 130 meets the maximum discharge power requirement, and the energy storage system 130 starts the discharge mode with a discharge power of Pdischarge = Pmaxdischarge. Otherwise, proceed to step S415.

[0079] In some specific embodiments, such as Figure 5 As shown, the control method also includes:

[0080] Step S501: Generate a first energy storage scheduling instruction. The first energy storage scheduling instruction is used to control the energy storage system 130 to switch to manual control mode and execute corresponding charging and discharging instructions according to the user's operation on the energy storage system 130.

[0081] Alternatively, step S502: generate a second energy storage scheduling instruction, which is used to control the energy storage system 130 to switch to automatic control mode and execute the control method of the energy storage system 130 provided in the above embodiment.

[0082] This application embodiment enables the energy storage system 130 to operate safely and stably in automatic control mode, and to respond to needs such as equipment failure, emergency dispatch, and power trading relocation by setting a manual / automatic switching mode.

[0083] In summary, the control method provided in this application flexibly adjusts the charging and discharging strategy of the energy storage system 130 according to the dynamic changes in market electricity prices to maximize the economic benefits of wind farms. Simultaneously, it ensures the healthy operation of the energy storage system 130 under different conditions, avoiding overcharging, over-discharging, and frequent scheduling during long-term use, thus maintaining good electrochemical performance, extending the equipment's lifespan, and reducing maintenance costs. Furthermore, this method fully considers the scheduling needs of the power grid 140, ensuring that the charging and discharging process of the energy storage system 130 is coordinated with the operation of the power grid 140, achieving harmonious coexistence between the wind farm and the power grid 140. By differentiating the charging and discharging process and control methods of the energy storage system 130 for different target scenarios, this method can more accurately meet the actual needs of wind farms and improve energy utilization efficiency. In implementation, this method not only ensures the stability of the power supply to wind farms but also improves their economic benefits.

[0084] Based on the above embodiments, this application also provides a computer device. Figure 6 A schematic diagram of a computer device structure is provided for an embodiment of this application, such as... Figure 6 As shown, it includes: processor 501, communication interface 502, memory 503 and communication bus 504, wherein processor 501, communication interface 502 and memory 503 communicate with each other through communication bus 504.

[0085] The memory 503 stores a computer program. When the program is executed by the processor 501, the processor 501 performs the following steps:

[0086] To obtain the power generation capacity of wind power generation devices, the power required for grid dispatch, and the power consumption of the wind farm load;

[0087] When the power generation of the wind power generation device is greater than the sum of the grid dispatch command and the power consumption of the station load, a first control command is generated. The first control command is used to control the wind power generation device to transmit electrical energy to the energy storage system.

[0088] When the power generation of the wind power generation device is less than or equal to the sum of the grid dispatch command and the power consumption of the station load, a second control command is generated. The second control command is used to control the energy storage system to transmit power to the station load.

[0089] The communication bus mentioned in the above computer equipment can be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. This communication bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used to represent it in the diagram, but this does not mean that there is only one bus or one type of bus.

[0090] Communication interface 502 is used for communication between the aforementioned computer equipment and other equipment.

[0091] The memory may include RAM (Random Access Memory) or NVM (Non-Volatile Memory), such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0092] The processors mentioned above can be general-purpose processors, including central processing units, network processors (NPs), etc.; they can also be DSPs (Digital Signal Processors), application-specific integrated circuits, field-programmable gate arrays or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0093] Based on the above embodiments, this application provides a computer-readable storage medium storing a computer program executable by a computer device. When the program is run on the computer device, the computer device performs the following steps:

[0094] To obtain the power generation capacity of wind power generation devices, the power required for grid dispatch, and the power consumption of the wind farm load;

[0095] When the power generation of the wind power generation device is greater than the sum of the grid dispatch command and the power consumption of the station load, a first control command is generated. The first control command is used to control the wind power generation device to transmit electrical energy to the energy storage system.

[0096] When the power generation of the wind power generation device is less than or equal to the sum of the grid dispatch command and the power consumption of the station load, a second control command is generated. The second control command is used to control the energy storage system to transmit power to the station load.

[0097] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0098] The embodiments of this application have now been described in detail. To avoid obscuring the concept of this application, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical methods disclosed herein based on the above description.

[0099] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. A control method for an energy storage system, characterized in that, include: To obtain the power generation capacity of wind power generation devices, the power required for grid dispatch, and the power consumption of the wind farm load; When the power generation of the wind power generation device is greater than the sum of the power grid dispatch command and the power consumption of the station load, the system power redundancy is calculated. The system power redundancy is the difference between the power generation of the wind power generation device and the sum of the power required by the power grid dispatch and the power consumption of the station load. When the system power redundancy is greater than the minimum charging power of the energy storage system, the charging power of the energy storage system is determined based on at least a portion of the following: the available power generation capacity of the power station, the first-level start-up threshold for energy storage charging during off-peak and par periods, the system power redundancy, the maximum charging power of the energy storage system, the minimum charging power of the energy storage system, the state of charge of the energy storage system, the maximum value of the state of charge of the energy storage system, and the scheduling cycle. Generate a first control command, which is used to control the wind power generation device to transmit electrical energy to the energy storage system based on the charging power of the energy storage system; When the power generation of the wind power generation device is less than or equal to the sum of the grid dispatch command and the power consumption of the station load, a second control command is generated. The second control command is used to control the energy storage system to transmit electrical energy to the station load. The determination of the charging power of the energy storage system includes: When the system power redundancy is less than or equal to the maximum charging power of the energy storage system, and At that time, the charging power of the energy storage system is Pcharge = Plimit, where SOC is the state of charge of the energy storage system, SOCmax is the maximum value of the state of charge of the energy storage system, and Plimit is the power redundancy of the system. The scheduling period; When the system power redundancy is less than or equal to the maximum charging power of the energy storage system, and ,and At that time, the charging power of the energy storage system Wherein, Pmincharge is the minimum charging power of the energy storage system; When the system power redundancy is greater than the maximum charging power of the energy storage system, and When the charging power of the energy storage system is Pcharge = Pmaxcharge, where Pmaxcharge is the maximum charging power of the energy storage system.

2. The method according to claim 1, characterized in that, When the power generation capacity of the wind power generation device is greater than the sum of the grid dispatch command and the power consumption of the power station load, the control method further includes: When the system power redundancy is less than or equal to the minimum charging power of the energy storage system, a third control command is generated, which is used to indicate that the energy storage system is in standby mode.

3. The method according to claim 2, characterized in that, Before calculating the system power redundancy, the control method further includes: It is confirmed that the power generation of the wind power generation device is greater than the energy storage charging start threshold during off-peak price periods and the energy storage charging start threshold during peak price periods.

4. The method according to claim 1, characterized in that, When the power generation capacity of the wind power generation device is less than or equal to the sum of the grid dispatch command and the power consumption of the power station load, the control method further includes: Confirm the current time period of the energy storage system; Based on the electricity price corresponding to the current time period of the energy storage system, as well as the power generation capacity of the wind power generation device and the power demand of the power station load, a second control command or a third control command is generated. The third control command is used to instruct the energy storage system to be in standby mode.

5. The method according to claim 4, characterized in that, When the power generation of the wind power generation device is less than the power demand of the station load, and the electricity price corresponding to the current time period of the energy storage system is higher than the first electricity price threshold, a second control command is generated. When the power generation of the wind power generation device is less than the power demand of the station load, and the electricity price corresponding to the current time period of the energy storage system is lower than or equal to the first electricity price threshold, a third control command is generated.

6. The method according to claim 5, characterized in that, The current time period of the energy storage system is further confirmed to include: If the standard deviation between the electricity price and its average value in the current time period is less than the first threshold, and the duration is greater than the second threshold, and the median of the electricity price in the current time period is less than the valley price threshold, then the current time period is a valley price period. If the standard deviation between the electricity price and its average value in the current time period is less than the first threshold, and the duration is greater than the second threshold, and the median of the electricity price in the current time period is greater than the peak price threshold, then the current time period is a peak price period. If the standard deviation between the current electricity price and its average value is less than the first threshold, and the duration is greater than the second threshold, and the median of the electricity price corresponding to the current time period is greater than the valley price threshold and less than the peak price threshold, then the current time period is a flat price period.

7. The method according to claim 6, characterized in that, The control method further includes: When the power generation of the wind power generation device is greater than the power demand of the power station load, and the current time period is a period of parity price or peak price, a fourth control command is generated. The fourth control command is used to control the energy storage system to transmit electrical energy to the power grid.

8. A wind farm station, characterized in that, include: A controller, and a wind power generation device, an energy storage system, a power grid, and a station load respectively connected to the controller, wherein the energy storage system is used to supply power to the power grid and the station load; The controller is configured to: To obtain the power generation capacity of wind power generation devices, the power required for grid dispatch, and the power consumption of the wind farm load; When the power generation of the wind power generation device is greater than the sum of the power grid dispatch command and the power consumption of the station load, the system power redundancy is calculated. The system power redundancy is the difference between the power generation of the wind power generation device and the sum of the power required by the power grid dispatch and the power consumption of the station load. When the system power redundancy is greater than the minimum charging power of the energy storage system, the charging power of the energy storage system is determined based on the system power redundancy, the maximum charging power of the energy storage system, the minimum charging power of the energy storage system, the state of charge of the energy storage system, the maximum value of the state of charge of the energy storage system, and the scheduling cycle. Generate a first control command, which is used to control the wind power generation device to transmit electrical energy to the energy storage system based on the charging power of the energy storage system; When the power generation of the wind power generation device is less than or equal to the sum of the grid dispatch command and the power consumption of the station load, a second control command is generated. The second control command is used by the energy storage system to transmit electrical energy to the station load. The determination of the charging power of the energy storage system includes: When the system power redundancy is less than or equal to the maximum charging power of the energy storage system, and At that time, the charging power of the energy storage system is Pcharge = Plimit, where SOC is the state of charge of the energy storage system, SOCmax is the maximum value of the state of charge of the energy storage system, and Plimit is the power redundancy of the system. The scheduling period; When the system power redundancy is less than or equal to the maximum charging power of the energy storage system, and ,and At that time, the charging power of the energy storage system Wherein, Pmincharge is the minimum charging power of the energy storage system; When the system power redundancy is greater than the maximum charging power of the energy storage system, and When the charging power of the energy storage system is Pcharge = Pmaxcharge, where Pmaxcharge is the maximum charging power of the energy storage system.

9. A computer device, comprising a processor and a memory storing a computer program, characterized in that, When the processor executes the program, it implements the method as described in any one of claims 1-7.

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