Control method of energy storage system, wind power station and computer equipment

Abstract

The invention provides a control method of an energy storage system, a wind power station and computer equipment. The control method comprises the following steps: acquiring the power generation power of a wind power generation device, the power required by power grid dispatching and the power utilization power of a station load; when the generated power of the wind power generation device is larger than the sum of the power grid dispatching instruction and the station load electric power, a first control instruction is generated and used for controlling the wind power generation device to transmit electric energy to the energy storage system; and when the generated power of the wind power generation device is smaller than or equal to the sum of the power grid dispatching instruction and the electric power of the station load, a second control instruction is generated and used for controlling the energy storage system to transmit electric energy to the station load.

Description

Technical Field

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

[0002] As an important component of wind farms, energy storage systems play an important role in improving the power generation efficiency of wind turbines, maintaining safe and stable operation of power grids, and solving the mismatch between power supply and demand of wind turbines. However, energy storage systems face the dual challenges of rapid cell performance degradation and shortened lifespan. Performance degradation means reduced equipment energy efficiency, which seriously affects the economic benefits and stable and safe operation of wind farms. Shortened lifespan means that energy storage systems need to be replaced regularly, increasing the operation and maintenance costs of wind farms. Summary of the invention

[0003] A technical problem to be solved by the present application is to keep the energy storage system in a healthy working state under different conditions, thereby reducing equipment loss and extending service life.

[0004] In order to solve the above technical problems, the embodiments of the present application provide a control method for an energy storage system, a wind farm station and a computer device.

[0005] An embodiment of the present application provides a control method for an energy storage system, the control method comprising: obtaining the power generation power of a wind power generation device, the power required for grid dispatching, and the power consumption of a station load; when the power generation power of the wind power generation device is greater than the sum of the grid dispatching instruction and the power consumption of the station load, generating a first control instruction, the first control instruction being used to control the wind power generation device to transmit electric energy to the energy storage system; when the power generation power of the wind power generation device is less than or equal to the sum of the grid dispatching instruction and the power consumption of the station load, generating a second control instruction, the second control instruction being used to control the energy storage system to transmit electric energy to the station load.

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

[0007] In some embodiments, the first control instruction 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 of the energy storage system=Plimit, wherein 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 of the energy storage system=(SOCmax-SOC)×60 / ΔT, 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 SOC≤SOCmax-Pmaxcharge×ΔT / 60, the charging power Pcharge of the energy storage system=Pmaxcharge, wherein 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 power of the wind power generation device is greater than the energy storage charging start threshold during valley price period and the energy storage charging start threshold during peak price period.

[0009] In some embodiments, when the power generation power of the wind power generation device is less than or equal to the sum of the grid dispatching instruction and the power consumption of the site load, the control method also includes: confirming the current time period of the energy storage system; generating a second control instruction or a third control instruction according to the electricity price corresponding to the current time period of the energy storage system, as well as the power generation power of the wind power generation device and the power consumption demand of the site load, the third control instruction is used to indicate that the energy storage system is in standby mode.

[0010] In some embodiments, when the power generation power of the wind power generation device is less than the power demand of the site 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 instruction is generated; when the power generation power of the wind power generation device is less than the power demand of the site 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 instruction 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 in the current time period is less than a first threshold value, and the duration is greater than a second threshold value, and the median of the electricity price corresponding to the current time period is less than a valley price setting threshold value, 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 a first threshold value, and the duration is greater than a second threshold value, and the median of the electricity price corresponding to the current time period is greater than a peak price setting threshold value, then the current time period is a peak price period; if the standard deviation between the electricity price and its average value in the current time period is less than a first threshold value, and the duration is greater than a second threshold value, and the median of the electricity price corresponding to the current time period is greater than the valley price setting threshold value and less than the peak price setting threshold value, then the current time period is a parity period.

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

[0013] An embodiment of the present application provides a wind farm station, which includes: a controller, and a wind power generation device, an energy storage system, a power grid and a station load respectively connected to the controller, the energy storage system is used to supply power to the power grid and the station load; the controller is configured to: obtain the power generation power of the wind power generation device, the power required for power grid dispatching and the power consumption of the station load; when the power generation power of the wind power generation device is greater than the sum of the power grid dispatching instruction and the power consumption of the station load, generate a first control instruction, the first control instruction is used to control the wind power generation device to transmit electric energy to the energy storage system; when the power generation power of the wind power generation device is less than or equal to the sum of the power grid dispatching instruction and the power consumption of the station load, generate a second control instruction, the second control instruction is used for the energy storage system to transmit electric energy to the station load.

[0014] An embodiment of the present application provides a computer device, including a processor and a memory storing a computer program, and when the processor executes the program, the method provided in the above embodiment is implemented.

[0015] An embodiment of the present application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the steps of any of the above-mentioned energy storage system control methods are performed.

[0016] Through the above technical methods, the control method of the energy storage system, the wind farm station and the computer equipment provided by this application can accurately control the charging and discharging process of the energy storage system by judging whether the power generation power of the wind power generation device can meet the power required for grid dispatching and the power consumption of the station load. This can ensure that the energy storage is in a healthy working state under different working conditions, reduce equipment loss and extend service life; at the same time, it can also optimize the energy utilization of wind farms, reduce energy waste, and respond flexibly to fluctuations in electricity prices and changes in market demand, maximize the use of peak-valley price differences, improve the economic benefits of wind farms, and reduce operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical methods in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural schematic diagram of a wind farm station disclosed in an embodiment of the present application;

[0019] Figure 2 It is a flow chart of a control method of an energy storage system disclosed in an embodiment of the present application;

[0020] Figure 3 is a flow chart of a control method disclosed in another embodiment of the present application;

[0021] Figure 4 is a flow chart of a control method disclosed in another embodiment of the present application;

[0022] Figure 5 is a flow chart of a control method disclosed in another embodiment of the present application;

[0023] Figure 6 A schematic diagram of the structure of a computer device disclosed in an embodiment of the present application.

[0024] Description of reference numerals:

[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 DESCRIPTION

[0026] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical methods that fall within the scope of the claims.

[0027] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0028] In addition, words such as “include” or “comprises” and the like used in the present application mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of also including other elements.

[0029] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0030] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

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

[0033] The controller 110 may include one or more processing units, for example, the controller 110 may include an application processor (AP), a modem processor, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more controllers 110. The controller 110 may generate an operation control signal according to the instruction opcode and the timing signal to complete the control of fetching and executing instructions.

[0034] The controller 110 may also be provided with a memory for storing instructions and data. For example, 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 have just been used or recycled by the controller 110. If the controller 110 needs to use the instruction or data again, it can be directly called from the memory. Repeated access is avoided, the waiting time of the controller 110 is reduced, and the efficiency of the system is improved.

[0035] The wind wheel in the wind power generation device 120 rotates under the action of wind, and the kinetic energy of the wind is converted into mechanical energy. Specifically, the wind wheel can convert low-speed mechanical energy into high-speed rotation through a gearbox, drive the generator to operate, and then the generator converts the mechanical energy into electrical energy. The generated electrical energy is boosted by a transformer and transmitted to the power grid 140 or supplied to users. However, due to the change in wind speed, the power generation of the wind power generation device 120 will be unstable, so it needs to be used in combination with the energy storage system 130.

[0036] The energy storage system 130 usually includes batteries, flywheel energy and other equipment to store excess electrical energy and release it when needed. Since wind power generation is intermittent, when the wind power generation device 120 generates excess electricity, the energy storage system 130 can store excess electricity to reduce the impact on the power grid 140. When the wind power generation device 120 generates insufficient electricity, the energy storage system 130 can provide additional electricity to balance the load of the power grid 140. Therefore, by adjusting the time of power generation and power consumption, the energy storage system 130 can improve the stability and reliability of the power grid 140.

[0037] The power grid 140 is a system that connects power plants to users, including transmission lines, substations, and distribution networks 140 , etc. The power grid 140 is responsible for transmitting the electric energy generated by the wind farm to end users, and also provides power to the wind farm load 150 .

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

[0039] As mentioned above, when the power generation of the wind power generation device 120 exceeds the absorption capacity of the power grid 140, the energy storage system 130 can effectively store excess wind power to avoid energy waste, and release electricity during peak hours to relieve the pressure on the power grid 140. In addition, in the face of high off-grid electricity prices, the energy storage system 130 optimizes the charging and discharging strategy through intelligent scheduling to ensure that the power demand of the station load 150 is met when the wind power generation device 120 generates insufficient power, which can greatly reduce the operating costs of the wind farm. However, the energy storage system 130 faces the dual challenges of rapid battery cell performance degradation and shortened life. Performance degradation means that the energy efficiency of the equipment decreases, which seriously affects the economic benefits and stable and safe operation of the wind farm. The shortened life means that the energy storage system 130 needs to be replaced regularly, which increases the operation and maintenance costs of the wind farm.

[0040] In view of this, the present application embodiment provides a control method of the energy storage system 130, such as Figure 2 As shown, the control method can be applied to the controller 110 in the wind farm station. The control method includes: S10: obtaining the power generation of the wind power generation device 120, the power required for the grid 140 dispatching and the power consumption of the station load 150; S11: when the power generation of the wind power generation device 120 is greater than the sum of the dispatching instruction of the grid 140 and the power consumption of the station load 150, a first control instruction is generated, and the first control instruction is used to control the wind power generation device 120 to transmit electric 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 dispatching instruction of the grid 140 and the power consumption of the station load 150, a second control instruction is generated, and the second control instruction is used for the energy storage system 130 to transmit electric energy to the station load 150.

[0041] The control method provided in the embodiment of the present application accurately controls the charging and discharging process of the energy storage system 130 by judging whether the power generation of the wind power generation device 120 can meet the power required for the grid 140 dispatching and the power consumption of the station load 150. Specifically, when the power generation of the wind power generation device 120 is greater than the sum of the dispatching instruction of the grid 140 and the power consumption of the station 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 at this time; otherwise, the energy storage system 130 starts discharging. In this way, it can ensure that the energy storage is in a healthy working state under different working conditions, reduce equipment loss, and extend service life; at the same time, it can also optimize the energy utilization of wind farms, reduce energy waste, and make flexible responses when electricity prices fluctuate and market demand changes, maximize the use of peak-valley price differences, improve the economic benefits of wind farms, and reduce operating costs.

[0042] The present application 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 the peak price period, valley price period and flat price period.

[0044] In a specific example, step S20 includes: step S201: obtaining historical transaction electricity price data, the historical transaction electricity price data including 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, fluctuation level, and duration of electricity prices, and divide the periods into peak price, valley price, and flat price periods.

[0046] For example, the level of electricity price can be determined by calculating the median of electricity price in the historical time period, the volatility of electricity price can be determined by calculating the standard deviation between electricity price and its average value in the historical time period, and the duration can be calculated by counting the specific length of time each electricity price level lasts. Therefore, according to the level, volatility and duration of electricity price, the peak price threshold can be set to the lowest value of electricity price in the peak price period, the valley price threshold can be set to the highest value of electricity price in the valley price period, and the parity threshold can be set to the lowest value of electricity price in the peak price period and the highest value of electricity price in the valley price period.

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

[0048] In a specific example, 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 is less than the 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 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 is greater than the 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 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 is greater than the valley price setting threshold and less than the peak price setting threshold, then the current time period is a parity period.

[0049] Thus, 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 the low electricity price period, the excess wind power can be absorbed and stored to the maximum extent to reduce wind abandonment. At the same time, the insufficient reserve power caused by the large-scale discharge of the energy storage system 130 during the peak price period can be compensated, and more redundant power can be provided for the power consumption of the station load 150. The specific steps are as follows:

[0050] like Figure 3As shown, step S300: obtain the available power generation power (Pavailable) of the wind farm, the power required for dispatching the power grid 140 (PAGC), 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 dispatching period ΔT (min), the maximum value (SOCmax) of the state of charge SOC of the energy storage system 130, and the minimum value (SOCmin) of the state of charge SOC of the energy storage system 130, and the power consumption (Pload) of the station load 150.

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

[0052] Step S302: Determine whether the current wind farm station is in a valley price or par price period, if so, execute step S303, otherwise, execute step S309.

[0053] Step S303: determine whether the available power generation power Pavailable of the wind farm is greater than the first-level start threshold of energy storage charging during valley price and parity period. If so, execute step S304; otherwise, the energy storage system 130 is in standby mode.

[0054] Step S304: determine whether the wind farm system power redundancy value Plimit<Pmincharge holds. 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 a standby state, and the actual power generated by the wind farm Pwind=PAGC.

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

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

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

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

[0059] Step S309: Determine whether Pavailable>the first-level start threshold of energy storage charging during peak price period. If so, execute steps S303-S308. Otherwise, the energy storage system 130 is in standby mode.

[0060] Since charging during valley prices causes the state of charge SOC of the energy storage system 130 to be at a higher state during peak prices, the first-level start threshold for energy storage charging during peak prices is set higher than the first-level start threshold for energy storage charging during valley prices to avoid frequent switching of charging and discharging of the energy storage system 130 during peak prices.

[0061] In some specific embodiments, in the above step S301, after determining that the current wind farm is not in a system power redundancy state, the discharge of the energy storage system 130 can also be controlled according to the electricity price corresponding to each time period. Considering the period when wind resources are insufficient, direct purchase of grid electricity will incur high electricity bills. Therefore, during the period when wind resources are scarce, the wind farm should be able to give priority to meeting the electricity demand within the farm and reduce the pressure on the grid 140 to send electricity in reverse. At the same time, during the peak price period of the electricity market, the energy storage system 130 will play its "energy transfer" value and increase the wind farm's electricity sales revenue by discharging to the grid. The specific steps are as follows:

[0062] like Figure 4 As shown, step S401: determine whether the current wind farm station is in a valley price period, if so, execute step S402, otherwise, execute step S409.

[0063] Step S402: Determine whether the available power generation power Pavailable of the wind farm is greater than or equal to the power consumption power Pload of the farm load +150. If so, the energy storage works in the standby state, and the actual power generation power Pwind of the wind farm = Pavailable. Otherwise, the actual power generation power of the wind farm cannot meet the power consumption demand of the farm load, and the shortfall power Plack = Pload-Pavailable is calculated, and step S403 is executed.

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

[0065] Step S404: determine whether the calculated power shortage Plack is less than the minimum discharge power Pmindischarge of the energy storage system 130. If so, 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 a standby state, and the insufficient power consumption of the field is supplemented by purchasing off-grid electricity.

[0066] Step S405: Determine Pmindischarge≤Plack≤Pmaxdischarge. If so, Plack meets the discharge power requirement of the energy storage system 130, and execute step S406. Otherwise, Plack is too high, and the discharge of the energy storage system 130 cannot fully cover the power load demand of the field. Therefore, the insufficient power consumption of the field is supplemented by purchasing off-grid power, and execute step S408.

[0067] Step S406: Determine whether the state of charge SOC of the energy storage system 130 is SOCmin+Plack×ΔT / 60 within a scheduling cycle. If so, the energy storage system 130 meets the discharge requirement of the power shortage, and the energy storage starts the discharge mode, the discharge power Pdischarge=Plack, and the actual power generated by the wind farm Pwind=Pavailable.

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

[0069] Step S408: Determine whether the state of charge SOC of the energy storage system 130 is SOCmin+Pmaxdischarge×ΔT / 60 within a scheduling cycle. If so, the energy storage system 130 meets the maximum discharge power requirement, the energy storage starts the discharge mode, the discharge power Pdischarge=Pmaxdischarge, and the insufficient power consumption of the field is supplemented by purchasing off-grid electricity. Otherwise, execute step S407.

[0070] In the above step S401, if Figure 5 As shown, if it is determined that the current wind farm station is not in the valley price period, the following steps are executed:

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

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

[0073] Step S411: determine whether the available power generation power Pavailable of the wind farm is less than the first-level start threshold of energy storage discharge during the parity and peak price periods. If so, execute 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, 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 system 130 works in a standby state.

[0075] Step S413: Determine if Pmindischarge≤PlackAGC≤Pmaxdischarge. If so, PlackAGC satisfies the discharge power requirement of the energy storage system 130 and executes step S414. Otherwise, PlackAGC is too high and the discharge of the energy storage system 130 cannot completely cover the power shortage required by the power grid 140 for dispatching, and instructs step S416.

[0076] Step S414: Determine whether the state of charge SOC of the energy storage system 130 is ≥ SOCmin + PlackAGC × ΔT / 60 within a scheduling cycle. If so, the discharge of the energy storage system 130 meets the power demand required for the scheduling of the power grid 140, and the energy storage starts the discharge mode, and the discharge power Pdischarge = PlackAGC.

[0077] Step S415: Determine whether the state of charge SOC of the energy storage system 130 is greater than or equal to SOCmin+Pmindischarge×ΔT / 60 within a scheduling cycle. If so, the energy storage system 130 can discharge at low power and does not meet the power demand required for full coverage of the grid 140 scheduling. The energy storage 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 requirement, and the energy storage system 130 works in the standby mode.

[0078] Step S416: Determine whether the state of charge SOC of the energy storage system 130 is SOCmin+Pmaxdischarge×ΔT / 60 within a scheduling cycle. If so, the energy storage system 130 meets the maximum discharge power requirement, and the energy storage system 130 starts the discharge mode, and the discharge power Pdischarge=Pmaxdischarge. Otherwise, execute step S415.

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

[0080] Step S501 : generating a first energy storage scheduling instruction, the first energy storage scheduling instruction is used to control the energy storage system 130 to switch to a 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: generating a second energy storage scheduling instruction, the second energy storage scheduling instruction is used to control the energy storage system 130 to switch to the automatic control mode and execute the control method of the energy storage system 130 provided in the above embodiment.

[0082] By setting a manual / automatic switching mode, the embodiment of the present application can enable the energy storage system 130 to operate safely and stably in the automatic control mode, and can also respond to equipment failures, emergency dispatch, power trading adjustments and other needs by switching to the manual control mode.

[0083] In summary, the control method provided in the embodiment of the present application flexibly adjusts the charging and discharging strategy of the energy storage system 130 according to the dynamic changes of the market transaction electricity price to maximize the economic benefits of the wind farm. At the same time, it can ensure the healthy operation of the energy storage system 130 under different conditions, avoid overcharging and overdischarging and frequent scheduling of the energy storage system 130 in long-term use, thereby maintaining good electrochemical properties, thereby extending the service life of the equipment and reducing maintenance costs. In addition, the method also fully considers the needs of the power grid 140 scheduling, ensures that the charging and discharging process of the energy storage system 130 is coordinated with the operation of the power grid 140, and realizes the harmonious coexistence of the wind farm and the power grid 140. By differentiating the charging and discharging process and control method of the energy storage system 130 for different target scenarios, the method can more accurately meet the actual needs of the wind farm and improve energy utilization efficiency. During implementation, the method not only ensures the stability of the power supply of the wind farm, but also improves the economic benefits of the wind farm.

[0084] Based on the above embodiments, the present application further provides a computer device, Figure 6 A schematic diagram of a computer device structure provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, it includes: a processor 501 , a communication interface 502 , a memory 503 and a communication bus 504 , wherein the processor 501 , the communication interface 502 , and the memory 503 communicate with each other via the 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] Obtain the power generated by the wind power generation device, the power required for grid dispatching, and the power consumed by the site load;

[0087] When the power generation power of the wind power generation device is greater than the sum of the power grid dispatching instruction and the power consumption of the station load, a first control instruction is generated, and the first control instruction is used to control the wind power generation device to transmit electric energy to the energy storage system;

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

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

[0090] The communication interface 502 is used for communication between the above-mentioned computer device and other devices.

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

[0092] The above-mentioned processor can be a general-purpose processor, including a central processing unit, NP (Network Processor), etc.; it can also be a DSP (Digital Signal Processing), an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc.

[0093] Based on the above embodiments, an embodiment of the present application provides a computer-readable storage medium, in which a computer program executable by a computer device is stored. When the program is run on the computer device, the computer device implements the following steps when executing:

[0094] Obtain the power generated by the wind power generation device, the power required for grid dispatching, and the power consumed by the site load;

[0095] When the power generation power of the wind power generation device is greater than the sum of the power grid dispatching instruction and the power consumption of the station load, a first control instruction is generated, and the first control instruction is used to control the wind power generation device to transmit electric energy to the energy storage system;

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

[0097] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0098] So far, the various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical method disclosed herein.

[0099] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A control method for an energy storage system, characterized in that: include: Obtain the power generated by the wind power generation device, the power required for grid dispatching, and the power consumed by the site load; When the power generation power of the wind power generation device is greater than the sum of the power grid dispatching instruction and the power consumption of the station load, a first control instruction is generated, wherein the first control instruction is used to control the wind power generation device to transmit electric energy to the energy storage system; When the power generation power of the wind power generation device is less than or equal to the sum of the grid dispatching instruction and the power consumption of the station load, a second control instruction is generated, and the second control instruction is used to control the energy storage system to transmit electric energy to the station load.

2. The method according to claim 1, characterized in that: When the power generation power of the wind power generation device is greater than the sum of the power grid dispatching instruction and the power consumption of the station load, the control method further includes: Calculating system power redundancy, where the system power redundancy is the difference between the power generated by the wind power generation device and the sum of the power required for grid dispatching and the power consumed by the station load; When the system power redundancy is greater than the minimum charging power of the energy storage system, generating a first control instruction; When the system power redundancy is less than or equal to the minimum charging power of the energy storage system, a third control instruction is generated, where the third control instruction is used to instruct the energy storage system to be in standby mode.

3. The method according to claim 2, characterized in that The first control instruction 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 of the energy storage system is equal to Plimit, wherein 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 system power redundancy. △ T 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 of the energy storage system is (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 of the energy storage system=Pmaxcharge, wherein Pmaxcharge is the maximum charging power of the energy storage system.

4. The method according to claim 2 or 3, characterized in that: Before calculating the system power redundancy, the control method further includes: Confirm that the power generation power of the wind power generation device is greater than the energy storage charging start threshold during the valley price period and the energy storage charging start threshold during the peak price period.

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

6. The method according to claim 5, characterized in that When the power generation power 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 instruction is generated; When the power generation power of the wind power generation device is less than the power demand of the site 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 instruction is generated.

7. The method according to claim 6, characterized in that Confirming the current time period of the energy storage system further includes: 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 corresponding to the current time period is less than the valley price setting threshold, then the current time period is the 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 corresponding to the current time period is greater than the peak price setting threshold, then the current time period is the peak 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 corresponding to the current time period is greater than the valley price setting threshold and less than the peak price setting threshold, then the current time period is a parity period.

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

9. A wind farm station, characterized in that: It includes: 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: Obtain the power generated by the wind power generation device, the power required for grid dispatching, and the power consumed by the site load; When the power generation power of the wind power generation device is greater than the sum of the power grid dispatching instruction and the power consumption of the station load, a first control instruction is generated, wherein the first control instruction is used to control the wind power generation device to transmit electric energy to the energy storage system; When the power generation power of the wind power generation device is less than or equal to the sum of the grid dispatching instruction and the power consumption of the station load, a second control instruction is generated, and the second control instruction is used for the energy storage system to transmit electric energy to the station load.

10. A computer device comprising a processor and a memory storing a computer program, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 8 is implemented.

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