Control method, control device and controller of energy storage system

Abstract

The invention provides a control method, a control device and a controller of an energy storage system. The control method comprises the steps that the current running state of the wind generating set is determined; performing charging control on the energy storage system of the wind generating set in response to the condition that the current running state of the wind generating set is a limited power state and the SOC value of the energy storage system does not exceed a first preset threshold value; and in response to the fact that the current operation state of the wind generating set is an unlimited power state and the SOC value of the energy storage system exceeds a second preset threshold value, discharging control is conducted on the energy storage system of the wind generating set, and the first preset threshold value is larger than the second preset threshold value. According to the control method disclosed by the embodiment of the invention, wind curtailment and power limitation loss can be reduced, and the generating capacity is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage, and more specifically, to a control method, a control device and a controller for an energy storage system. Background Art

[0002] At present, there are more and more wind turbines (referred to as wind turbines, units and wind turbines, etc.) equipped with energy storage systems or energy storage devices. The main purpose of equipping with energy storage devices is to solve the problems of frequency disturbance and voltage fluctuation of wind turbines.

[0003] Since the amount of electricity that wind turbines can access is controlled by dispatch, wind power may be abandoned and wind turbine power may be limited. Therefore, energy storage can be used to store excess electricity during power restrictions, and release it when the wind farm is not subject to power restrictions, thereby reducing power generation losses caused by power restrictions.

[0004] In addition, most existing solutions use wind farm controllers (i.e., energy management platforms / central control) for remote control, which can only simply control the charging or discharging of energy storage, and cannot be controlled in combination with the operating status of the wind turbine (whether power is limited). The effect of reducing power generation losses caused by power restrictions is limited. Summary of the invention

[0005] In order to at least solve the above problems in the prior art, the present disclosure provides a control method, a control device and a controller for an energy storage system.

[0006] According to one aspect of the present disclosure, a control method for an energy storage system of a wind turbine is provided, the control method comprising: determining a current operating state of the wind turbine; in response to the current operating state of the wind turbine being a power-limited state and the SOC value of the energy storage system not exceeding a first preset threshold, performing charging control on the energy storage system of the wind turbine; in response to the current operating state of the wind turbine being a non-power-limited state and the SOC value of the energy storage system exceeding a second preset threshold, performing discharging control on the energy storage system of the wind turbine, wherein the first preset threshold is greater than the second preset threshold.

[0007] Optionally, the control method may also include: determining a current operating mode of the energy storage system; in response to the current operating mode of the energy storage system being a stand-alone mode, having the main control of the wind turbine generator set perform charging control and discharging control; in response to the current operating mode of the energy storage system being a non-stand-alone mode, having the energy management platform of the site where the wind turbine generator set is located perform charging control and discharging control.

[0008] Optionally, in response to the current operating state of the wind turbine being a non-power limited state and the SOC value of the energy storage system exceeding a second preset threshold, the step of performing discharge control on the energy storage system of the wind turbine includes: performing discharge control on the energy storage system of the wind turbine in response to the current operating state of the wind turbine being a non-power limited state, the SOC value of the energy storage system exceeding the second preset threshold and the energy storage system being not in a long-term static state.

[0009] Optionally, in response to the current operating state of the wind turbine generator set being a non-power-limited state and the SOC value of the energy storage system exceeding a second preset threshold, the step of performing discharge control on the energy storage system of the wind turbine generator set may further include: in response to the current operating state of the wind turbine generator set being a non-power-limited state, the SOC value of the energy storage system exceeding the second preset threshold and the energy storage system being in a long-term static state, not performing discharge control on the energy storage system of the wind turbine generator set.

[0010] Optionally, the step of performing discharge control on the energy storage system of the wind turbine generator set may include: calculating a first given power of the energy storage system, wherein the first given power is equal to the rated power of the wind turbine generator set minus the current real-time power of the wind turbine generator set; in response to the first given power being less than or equal to the dischargeable capacity of the energy storage system, issuing a control instruction corresponding to the first given power to the energy storage system; in response to the first given power being greater than the dischargeable capacity of the energy storage system, issuing a control instruction corresponding to the dischargeable capacity to the energy storage system.

[0011] Optionally, when the current working mode of the energy storage system is the stand-alone mode, the first given power may be assigned to the control instruction, so that the control instruction corresponding to the first given power is sent to the energy storage system.

[0012] Optionally, the step of controlling the charging of the energy storage system of the wind turbine generator set may include: calculating a second given power of the energy storage system, the second given power being equal to the power limit value of the energy management platform minus the current real-time power of the wind turbine generator set; in response to the second given power being less than or equal to the chargeable capacity of the energy storage system, sending a control instruction corresponding to the second given power to the energy storage system; in response to the second given power being greater than the chargeable capacity of the energy storage system, sending a control instruction corresponding to the chargeable capacity to the energy storage system.

[0013] When the current mode of the energy storage system is the stand-alone mode, the energy storage given power of the energy management platform of the site where the wind turbine generator set is located can be assigned to the control instruction to send the control instruction corresponding to the second given power to the energy storage system.

[0014] Optionally, the control method may further include: controlling the energy storage system to shut down in response to at least one of the following situations: the energy storage enable state is zero, the energy storage fault state is an energy storage emergency shutdown, the energy storage fault state is an energy storage normal shutdown fault, the energy storage stage is a fault stage, and the wind turbine converter grid side is not in a modulation state.

[0015] According to a second aspect of the present disclosure, a computer-readable storage medium is provided. The computer-readable storage medium stores instructions or programs, and when the instructions or programs are executed by a processor, the above control method is implemented.

[0016] According to a third aspect of the present disclosure, a control device for an energy storage system of a wind turbine generator set is provided, the control device comprising: a state determination unit, determining a current operating state of the wind turbine generator set; a control unit, in response to the current operating state of the wind turbine generator set being a power-limited state and the SOC value of the energy storage system not exceeding a first preset threshold, performing charging control on the energy storage system of the wind turbine generator set; in response to the current operating state of the wind turbine generator set being a non-power-limited state and the SOC value of the energy storage system exceeding a second preset threshold, performing discharging control on the energy storage system of the wind turbine generator set, wherein the first preset threshold is greater than the second preset threshold.

[0017] According to a fourth aspect of the present disclosure, a controller of a wind turbine generator set is provided, the controller comprising a processor and a computer-readable storage medium, the computer-readable storage medium storing a program or instruction, and implementing the above control method when the program or instruction is executed by the processor.

[0018] According to a fifth aspect of the present disclosure, a wind turbine generator set is provided, comprising the above-mentioned controller.

[0019] The control method and control device disclosed in the present invention are combined with the current operating status of the unit, and store electric energy in the energy storage system under the condition of wind power curtailment and power rationing. When there is no power rationing, the stored electric energy is released to the power grid, thereby increasing the power generation and reducing the losses caused by wind power curtailment and power rationing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 2 is a diagram showing a wind turbine energy storage and conversion communication architecture according to an embodiment of the present disclosure.

[0021] Figure 2 is a flowchart illustrating a control method according to the first embodiment of the present disclosure.

[0022] Figure 3 is a flowchart illustrating a control method according to a second embodiment of the present disclosure.

[0023] Figure 4 is a flowchart illustrating a control method according to a third embodiment of the present disclosure.

[0024] Figure 5 is a flowchart illustrating a control method according to a fourth embodiment of the present disclosure.

[0025] Figure 6 is a flowchart illustrating a control method according to a fifth embodiment of the present disclosure.

[0026] Figure 7 is a flowchart showing a specific process of mode switching control according to an embodiment of the present disclosure.

[0027] Figure 8 is a flowchart showing a specific process of energy storage charging control according to an embodiment of the present disclosure.

[0028] Fig. 9 is a flowchart showing a specific process of energy storage discharge control according to an embodiment of the present disclosure.

[0029] Fig.10 is a block diagram illustrating a control device according to an embodiment of the present disclosure.

[0030] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings, and the same or similar elements will be indicated by the same or similar reference numerals throughout the accompanying drawings. DETAILED DESCRIPTION

[0031] The following detailed description is provided to help gain a comprehensive understanding of the methods, devices and / or systems described herein. However, the order of operations described herein is only an example and is not limited to those orders set forth herein, but may be equivalently replaced or changed except for operations that must occur or be performed in a specific order. In addition, for greater clarity and simplicity, the description of content known in the art will be omitted or simplified.

[0032] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by a person of ordinary skill in the art to which the present disclosure belongs after understanding the present disclosure. Unless explicitly defined as such herein, terms (such as those defined in a general dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal manner.

[0033] Unless otherwise specified, the same reference numerals generally refer to the same elements (e.g., components, steps, and methods). Reference numerals described in the previous embodiments may be omitted if they appear again in the subsequent embodiments. In addition, the technical features described in different or the same embodiments may be combined in any manner, as long as the combined embodiments or technical solutions are complete and can solve the technical problems of the present application or achieve the technical effects described or not described in the present disclosure but can be determined based on the above complete technical solutions. The terms used in the present disclosure are explained below.

[0034] 1. SOC: The state of charge of the energy storage system (power percentage).

[0035] 2. The static state of the energy storage system: The main control does not control its charging and discharging. As the power gradually decays after long-term storage, the energy storage system itself charges itself through the power grid to protect the battery and prevent damage to the battery due to long-term storage.

[0036] 3. Converter: An electrical device used to convert electrical power into one or more forms of electrical power suitable for use by the power grid or users. Specifically in the field of wind power, wind power converters regulate the voltage, frequency, and phase of the electrical energy generated by wind turbines to meet the grid connection requirements and realize the transmission of electrical energy.

[0037] Figure 1 2 is a diagram showing a wind turbine energy storage and conversion communication architecture according to an embodiment of the present disclosure.

[0038] Reference Figure 1 In the wind turbine energy storage converter communication architecture disclosed in the present invention, in the downstream direction, the energy control platform (EMP) can transmit the control information to the wind turbine master control via the switch through OPC-UA, and the wind turbine master control can transmit the control information to the wind turbine converter (wind turbine converter) through the Profibus-DP bus, and the wind turbine converter transmits the control information to the DC energy storage (energy storage system) through Modbus-tcp.

[0039] In the upstream direction, the energy storage system transmits operating data, operating status, etc. to the wind turbine converter through Modbus-tcp, then transmits it to the wind turbine master control through the Profibus-DP bus, and then transmits it to the energy management platform.

[0040] The control method disclosed herein can be executed by the wind turbine master control or by the energy management platform. In other words, the control method disclosed herein can be deployed on the master control of the wind turbine generator set or on the field control (i.e., wind farm controller) of the wind farm where the wind turbine generator set is located.

[0041] Figure 2 is a flowchart illustrating a control method according to the first embodiment of the present disclosure.

[0042] The control method according to the first embodiment of the present disclosure may include step S210 , step S220 , and step S230 .

[0043] In step S210, the current operating state of the wind turbine generator set is determined.

[0044] The current operating state of the wind turbine generator set may include a limited power operating state (or referred to as a limited power state) and a non-limited power operating state (or referred to as a non-limited power state). The current operating state of the wind turbine generator set may be determined by a state flag.

[0045] Whether it is the master control or the field control, the current operating state of the wind turbine generator set can be determined according to the state flag of the wind turbine generator set. In other words, the information or signal corresponding to the state flag can be transmitted between the master control and the energy management platform.

[0046] Power-limited operation means that under certain conditions, the output power of a wind turbine cannot exceed a limit value, which is determined by the design characteristics of the wind turbine and the requirements of the grid to which it is connected. The main purpose of wind turbine power-limited operation is to protect the wind turbine from excessive load and to protect the stable operation of the grid (the output power is subject to scheduling adjustments).

[0047] In step S220, in response to the current operating state of the wind turbine generator set being a power-limited state and the SOC value of the energy storage system not exceeding a first preset threshold, charging control is performed on the energy storage system of the wind turbine generator set.

[0048] That is to say, when the wind turbine generator set is in a power-limited state, a portion of the electricity generated by the generator of the wind turbine generator set can be stored in the energy storage system of the wind turbine generator set for later use.

[0049] As described above, the state of charge of the energy storage system (i.e., the size of the SOC value) can be obtained through communication between the master control (or EMP) and the energy storage system. For example, the state of charge of the energy storage system can be obtained from the operating data or status transmitted by the energy storage system.

[0050] The first preset threshold here can be determined according to relevant parameters of the energy storage system, for example, the first preset threshold can be 90%. That is to say, when there is excess power not needed by the power grid in the power generated by the wind turbine and the energy storage system has charging space, the energy storage system of the wind turbine generator set can be charged.

[0051] In addition, while the energy storage system of the wind turbine generator set is being charged, the wind turbine generator set can be controlled to normally supply the power set by the dispatching to the power grid, that is, the main control or field control can perform normal control.

[0052] In step S230, in response to the current operating state of the wind turbine being a non-power-limited state and the SOC value of the energy storage system exceeding a second preset threshold, discharge control is performed on the energy storage system of the wind turbine. The second preset threshold may be less than or equal to the first preset threshold.

[0053] That is to say, when the wind turbine is in a non-power-limited state, the electricity generated by the wind turbine's generator may not be able to meet the grid demand. The energy storage system can be controlled to discharge to increase the grid-connected point power of the wind turbine to meet the grid demand.

[0054] As described above, the SOC value of the energy storage system can be obtained in real time through communication between the master control (or EMP) and the energy storage system. For example, the SOC value of the energy storage system can be obtained from the operating data or status data transmitted by the energy storage system.

[0055] The second preset threshold here can also be determined according to the relevant parameters of the energy storage system. For example, the second preset threshold can be 10%. That is to say, when the power generated by the generator of the wind turbine generator set cannot meet the needs of the power grid and there is discharge space in the energy storage system, the energy storage system of the wind turbine generator set can be discharged. When the SOC value of the energy storage system does not meet the corresponding requirements, the corresponding charge and discharge control may not be performed. In addition, a comprehensive judgment can be made based on whether the energy storage system is in a long-term static state.

[0056] Specifically, in response to the current operating state of the wind turbine generator set being a non-power-limited state and the SOC value of the energy storage system exceeding a second preset threshold, the step of performing discharge control on the energy storage system of the wind turbine generator set may include: in response to the current operating state of the wind turbine generator set being a non-power-limited state, the SOC value of the energy storage system exceeding the second preset threshold and the energy storage system not being in a long-term static state (the specific static time may be determined according to relevant parameters of the energy storage system), performing discharge control on the energy storage system of the wind turbine generator set. In addition, whether the energy storage system is in a long-term static state may also be determined by a corresponding state flag.

[0057] In addition, in response to the current operating state of the wind turbine generator set being a non-power-limited state and the SOC value of the energy storage system exceeding the second preset threshold, the step of performing discharge control on the energy storage system of the wind turbine generator set may further include: in response to the current operating state of the wind turbine generator set being a non-power-limited state, the SOC value of the energy storage system exceeding the second preset threshold and the energy storage system being in a long-term static state, not performing discharge control on the energy storage system of the wind turbine generator set. That is, if the energy storage system is in a long-term static state, then the energy storage system is not subjected to discharge control.

[0058] Figure 3 is a flowchart illustrating a control method according to a second embodiment of the present disclosure.

[0059] The control method according to the second embodiment of the present disclosure may include step S211 , step S212 , step S213 , step S214 , step S221 , and step S231 .

[0060] In step S211, it is determined whether the wind turbine generator set is in a power-limited state or a power-limited operating state. As described above, the determination can be made through a state flag.

[0061] If the wind turbine generator set is in a power-limited state, then in step S212, it is further determined whether the SOC value of the energy storage system exceeds a first preset threshold.

[0062] If the wind turbine generator set is in a non-power-limited state, then in step S213, it is further determined whether the SOC value of the energy storage system exceeds a second preset threshold.

[0063] If the SOC value of the energy storage system does not exceed the second preset threshold, then in step S214, the charge and discharge control is not performed.

[0064] If the SOC value of the energy storage system exceeds the second preset threshold, in step S231 , charge and discharge control is performed.

[0065] If the first preset threshold is not exceeded, then in step S221, the energy storage system of the wind turbine generator set is charged and controlled. The execution subject of the above control method can be determined according to the current working mode of the energy storage system. Figure 4 Describe in detail.

[0066] Figure 4 is a flowchart illustrating a control method according to a third embodiment of the present disclosure.

[0067] The control method according to the third embodiment of the present disclosure may further include step S410 , step S420 , and step S430 .

[0068] In step S410, the current operating mode of the energy storage system is determined.

[0069] The current working mode of the energy storage system can be determined based on the operating data or status data of the energy storage system. For example, the current working mode of the energy storage system can be determined based on the corresponding flag bit. The current working mode of the energy storage system may include a stand-alone mode and a non-stand-alone mode (for example, a remote mode, a test mode). The current working mode of the energy storage system can be an existing working mode of various energy storage systems. The present disclosure does not need to set other working modes for the energy storage system. The control in the remote mode and the test mode can be controlled by the energy management platform, but this is only an example.

[0070] In step S420, in response to the current working mode of the energy storage system being the stand-alone mode, the main control of the wind turbine generator set performs charging control and discharging control.

[0071] In step S430, in response to the current working mode of the energy storage system being a non-stand-alone mode, the energy management platform of the site where the wind turbine generator set is located executes charging control and discharging control.

[0072] That is to say, when the working mode of the energy storage system is switched from stand-alone mode to other modes, or from other modes to stand-alone mode, the control right of charge and discharge control can be switched between the main control and the energy management platform, that is, it can be switched between the main control and the field control.

[0073] Figure 5 is a flowchart illustrating a control method according to a fourth embodiment of the present disclosure.

[0074] The control method according to the fourth embodiment of the present disclosure includes a specific process of discharging control of the energy storage system of the wind turbine generator set, and the specific process may be as follows: step S2311, step S2312 and step S2313.

[0075] In step S2311, a first given power of the energy storage system is calculated.

[0076] The first given power here is equal to the rated power of the wind turbine generator set minus the current real-time power of the wind turbine generator set.

[0077] In step S2312, in response to the first given power being less than or equal to the dischargeable capacity of the energy storage system, a control instruction corresponding to the first given power is issued to the energy storage system.

[0078] The dischargeable capacity here refers to the discharge power of the energy storage system, that is, if the first given power is less than or equal to the dischargeable capacity, the discharge is performed at the first given power.

[0079] In step S2313, in response to the first given power being greater than the dischargeable capacity of the energy storage system, a control instruction (given energy storage power) corresponding to the dischargeable capacity is issued to the energy storage system. If the first given power is greater than the dischargeable capacity, discharge is performed at the dischargeable capacity. In addition, when the energy storage system is not subjected to discharge control, the corresponding discharge power can be set to 0. In addition, the control instruction or given energy storage power ultimately issued to the energy storage system may also be limited by the difference between the rated power of the unit and the grid-side power (this will be described in detail later).

[0080] The above-mentioned control right switching can be achieved by whether the energy storage given power of the main control and energy management platform or the energy storage power given value is assigned to the control instruction.

[0081] For example, when the current working mode of the energy storage system is the stand-alone mode, the first given power can be assigned to the control instruction (for example, it can be assigned by the main control of the wind turbine generator set) to send the control instruction corresponding to the first given power to the energy storage system. At the same time, the energy storage given power of the energy management platform of the site where the wind turbine generator set is located is no longer assigned to the control instruction.

[0082] Figure 6 is a flowchart illustrating a control method according to a fifth embodiment of the present disclosure.

[0083] The control method according to the fifth embodiment of the present disclosure includes a specific process of controlling the charging of the energy storage system of the wind turbine generator set, and the specific process may be shown in step S2211, step S2212 and step S2213.

[0084] In step S2211, a second given power of the energy storage system is calculated, where the second given power is equal to the power limit value of the energy management platform minus the current real-time power of the wind turbine generator set.

[0085] In step S2212, in response to the second given power being less than or equal to the chargeable capacity of the energy storage system, a control instruction corresponding to the second given power is issued to the energy storage system.

[0086] The dischargeable capacity here refers to the discharge power of the energy storage system, that is, if the second given power is less than or equal to the chargeable capacity, the discharge is performed at the second given power.

[0087] In step S2213, in response to the second given power being greater than the chargeable capacity of the energy storage system, a control instruction corresponding to the chargeable capacity is issued to the energy storage system.

[0088] If the second given power is greater than the chargeable capacity, the discharge is performed with the chargeable capacity. In addition, when the energy storage system is not charged, the corresponding charging power can be set to 0.

[0089] The above-mentioned control right switching can also be achieved by assigning a given power of the energy storage of the main control and energy management platform to the control instruction.

[0090] As an example, when the current mode of the energy storage system is the stand-alone mode, the energy storage given power of the energy management platform of the site where the wind turbine generator set is located is assigned to the control instruction, so that the control instruction corresponding to the second given power is sent to the energy storage system. At the same time, the energy storage given power determined by the master control is no longer assigned to the control instruction.

[0091] Figure 7 is a flowchart showing a specific process of mode switching control according to an embodiment of the present disclosure.

[0092] The mode switching function control according to an embodiment of the present disclosure may specifically include step S710 , step S720 , step S730 , step S740 , step S750 , step S760 , and step S770 .

[0093] In step S710, it is determined whether the control mode or current operation mode of the energy storage system is a stand-alone mode.

[0094] If the current operation mode of the energy storage system is the stand-alone mode, the energy storage system is controlled by the master control in step S720.

[0095] If the current operation mode of the energy storage system is not the stand-alone mode, the energy storage system is controlled by the energy management platform or the central control in step S760.

[0096] In step S730, the master control is executed to reduce wind power curtailment and power restriction.

[0097] In step S740, a control instruction is given by the main control.

[0098] In step S750, the energy storage power given by the master control (or the given energy storage power) is assigned to the control instruction.

[0099] In step S770, the energy storage power given by the EMP is assigned to the control instruction.

[0100] Although not shown, the mode switching function control according to the embodiment of the present disclosure may further include other steps (eg, a specific calculation step of the energy storage power), and some steps may be omitted, for example, step S730 may be omitted.

[0101] Figure 8 is a flowchart showing a specific process of energy storage charging control according to an embodiment of the present disclosure.

[0102] The energy storage charging control according to an embodiment of the present disclosure may include step S810, step S820, step S830, step S840, step S850, step S860, step S870, step S880, step S890, step S811, step S821, step S831, step S832, step S861, step S871 and step S881.

[0103] In step S810, it is determined whether the current operation mode of the energy storage system is a stand-alone mode.

[0104] If the current operation mode of the energy storage system is the stand-alone mode, then in step S820, it is further determined whether the unit is in a power-limited operation state.

[0105] If the current operating mode of the energy storage system is not a stand-alone mode, the power of the unit can be set to the central control power setting in step S811, and the energy storage master control bit can be set to zero (that is, the control is transferred to the central control (that is, the energy management platform)), that is, the power of the wind turbine can be controlled by the EMP.

[0106] If the unit is in a non-power-limited state, the process may jump to the discharge process in step S821.

[0107] If the unit is in a power-limited state, then in step S830, it is further determined whether the SOC value of the energy storage system is less than a preset threshold (eg, 90%).

[0108] If the SOC value of the energy storage system is less than the preset threshold, then in step S840 , it is determined whether the enable state is 1.

[0109] If the enabling state is 1, then in step S850, it is further determined whether the conditions that the energy storage fault state is no fault and the energy storage fault state is normal are met.

[0110] If the SOC value of the energy storage system is not less than the preset threshold, the energy storage enable state is not 1 or the above conditions are not met, the energy storage power given value can be set to 0 (that is, the discharge power is set to 0) in step S831, and the energy storage system can be shut down in step S832.

[0111] If the above conditions are met, then in step S860, it is further determined whether the energy storage system is started.

[0112] If the energy storage system is started, then in step S870, the energy storage power setting (charging) is calculated.

[0113] If the energy storage system is not started, then in step S861 , it is determined whether the energy storage system is ready.

[0114] If the energy storage system is ready, the energy storage system is started in step S871. If the energy storage system is not ready, it can be determined that a failure may occur in the energy storage system.

[0115] In step S880, it is determined whether the calculated energy storage power (ie, the given energy storage power) is greater than the chargeable power of the energy storage system.

[0116] If the calculated energy storage power is greater than the chargeable power of the energy storage system, then in step S890 , the chargeable power is determined as the energy storage given power (ie, discharge is performed at the chargeable power).

[0117] If the calculated energy storage power is less than or equal to the chargeable power of the energy storage system, then in step S881, the calculated energy storage power is determined as the charging power (ie, discharging is performed at the calculated energy storage power).

[0118] Fig. 9 is a flowchart showing a specific process of energy storage discharge control according to an embodiment of the present disclosure.

[0119] The energy storage charging control according to an embodiment of the present disclosure may include step S910, step S920, step S922, step S930, step S940, step S950, step S960, step S962, step S963, step S970, step S980, step S990, step S911, step S921, step S931, step S932, step S961, step S971 and step S981.

[0120] In step S910, it is determined whether the current operation mode of the energy storage system is a stand-alone mode.

[0121] If the current operation mode of the energy storage system is the stand-alone mode, then in step S920, it is further determined whether the unit is in a power-limited operation state.

[0122] If the current operating mode of the energy storage system is not the stand-alone mode, the output power of the unit is set to the central control power setting in step S911, and the energy storage master control bit is set to zero (that is, control is transferred to the central control (that is, the energy management platform)).

[0123] If the unit is in a power-limited state, then in step S922, it is further determined whether the energy storage system is in a long-term static state.

[0124] If the unit is in a non-power-limited state, the process may jump to the charging process in step S921.

[0125] If the energy storage system is not in a long-term static state, then in step S930 , it is further determined whether the SOC value of the energy storage system is greater than a preset threshold (eg, 10%).

[0126] If the SOC value of the energy storage system is greater than the preset threshold, then in step S940 , it is determined whether the enable state is 1.

[0127] If the enabling state is 1, then in step S950, it is further determined whether the conditions that the energy storage fault state is no fault and the energy storage fault state is normal are met.

[0128] If the SOC value of the energy storage system is not greater than the preset threshold, the energy storage enable state is not 1, the above conditions are not met, or the energy storage system is in a long-term static state, the energy storage power set value can be set to 0 (that is, the discharge power is set to 0) in step S931, and the energy storage system can be shut down in step S932.

[0129] If the above conditions are met, then in step S960, it is further determined whether the energy storage system is started.

[0130] If the energy storage system is started, then in step S970, the energy storage power setting (discharging) is calculated.

[0131] If the energy storage system is not started, then in step S961 , it is determined whether the energy storage system is ready.

[0132] If the energy storage system is ready, the energy storage system is started in step S971. If the energy storage system is not ready, it can be determined that a failure may occur in the energy storage system.

[0133] In step S963, it is determined whether the given energy storage power is greater than the available power (or available capacity).

[0134] If the given energy storage power is greater than the available power, then in step S970, the given energy storage power is determined to be set to the available power.

[0135] In step S980, it is determined whether the calculated energy storage power (i.e., the given energy storage power) is greater than the difference between the rated power of the unit and the grid-side power, that is, whether the discharge of the energy storage system with the dischargeable power exceeds the grid demand.

[0136] If the calculated energy storage power is greater than the difference between the rated power of the unit and the grid-side power (when comparing, only the numerical values ​​are compared), then in step S990, the energy storage given power is determined as the above difference. That is, if the energy storage system discharges at the dischargeable power, when the sum of the discharge power and the rated power is greater than the grid demand, only the power corresponding to the difference between the two (the negative sign in front of the value indicates discharge) is discharged.

[0137] If the calculated energy storage power is not greater than the difference between the rated power of the unit and the grid-side power, then in step S981, the available power is determined as the energy storage given power. In other words, if the energy storage system discharges at the available power, and the sum of the discharge power and the rated power still does not meet the grid demand, then discharge is performed at the available power.

[0138] Although the control method of the present disclosure can also control the energy storage system to shut down under certain conditions. For example, the control method of the present disclosure can also include controlling the energy storage system to shut down in response to at least one of the following conditions: the energy storage enable state is zero, the energy storage fault state is an energy storage emergency shutdown, the energy storage fault state is an energy storage normal shutdown fault, the energy storage stage is a fault stage, and the wind turbine converter grid side is not in a modulation state. Before controlling the energy storage system to shut down, the energy storage power setting of the energy storage system can be set to 0 (that is, the charging power or the discharging power is set to 0).

[0139] Fig.10 is a block diagram illustrating a control device according to an embodiment of the present disclosure.

[0140] The control device 800 according to an embodiment of the present disclosure may include a state determination unit 810 and a control unit 820 .

[0141] The state determination unit 810 may determine the current operating state of the wind turbine generator set. The specific operating mode of the current operating state of the wind turbine generator set may be as described above, which will not be described in detail here.

[0142] The control unit 820 can control the charging of the energy storage system of the wind turbine generator set in response to the current operating state of the wind turbine generator set being a power-limited state and the SOC value of the energy storage system not exceeding a first preset threshold value; and can control the discharging of the energy storage system of the wind turbine generator set in response to the current operating state of the wind turbine generator set being a non-power-limited state and the SOC value of the energy storage system exceeding a second preset threshold value. Here, the first preset threshold value is greater than the second preset threshold value.

[0143] In addition, the control unit 820 may also execute any one of the steps in the above control method, which will not be described in detail here.

[0144] The above has been referred to Figures 1 to 10 Systems such as control methods and devices according to embodiments of the present disclosure are described. However, it should be understood that the devices and systems shown in the accompanying drawings may be configured as software, hardware, firmware, or any combination of the above items to perform specific functions. For example, these systems and devices may correspond to dedicated integrated circuits, pure software codes, or modules that combine software and hardware. In addition, one or more functions implemented by these systems or devices may also be uniformly performed by components in physical entity devices (e.g., processors, clients, or servers, etc.).

[0145] The instructions stored in the computer-readable storage medium can be executed in an environment deployed in a computer device such as a client, a host, an agent device, a server, etc. It should be noted that the instructions can also be used to perform additional steps in addition to the above steps or perform more specific processing when performing the above steps. The contents of these additional steps and further processing have been described in reference to Figures 1 to 10 It is mentioned in the description of related systems and methods, so it will not be repeated here to avoid repetition.

[0146] It should be noted that the control method and control device according to the embodiments of the present disclosure can completely rely on the operation of computer programs or instructions to realize the corresponding functions, that is, each device corresponds to each step in the functional architecture of the computer program, so that the entire system is called through a special software package (for example, lib library) to realize the corresponding function.

[0147] On the other hand, when Fig.10 When the device shown is implemented in software, firmware, middleware or microcode, the program code or code segment for performing the corresponding operation can be stored in a computer-readable medium such as a storage medium, so that at least one processor or at least one computing device can perform the corresponding operation by reading and running the corresponding program code or code segment. In addition, the computer-readable medium or storage medium can prompt the processor to execute the above-mentioned anti-vortex-induced vibration control method when the computer program is executed by the processor.

[0148] For example, according to an exemplary embodiment of the present disclosure, a computer device including a readable medium storing computer program instructions may be provided, wherein when the instructions are executed by at least one computing device, the at least one computing device is prompted to perform at least one of the above steps.

[0149] In addition, the present disclosure may provide a controller of a wind turbine generator set, which may include: a processor; a memory storing a computer program, and when the computer program is executed by the processor, the processor is prompted to execute the above control method. The present disclosure may also provide a wind turbine generator set, which may include the above controller.

[0150] The control method and control device according to the embodiments of the present disclosure can reduce wind power curtailment and power limitation losses and increase power generation.

[0151] In addition, for the main control, there is no need to modify the hardware, and it can be achieved by simply modifying the control strategy. For the converter, there is no need to add additional hardware.

[0152] The control method and control device disclosed in the present invention can be combined with the current operating status of the unit to store electric energy in the energy storage system under the condition of wind power curtailment and power rationing, and release the stored electric energy to the power grid when there is no power rationing, thereby increasing the power generation and reducing the losses caused by wind power curtailment and power rationing.

Claims

1. A control method for an energy storage system of a wind turbine generator set, characterized in that: The control method comprises: Determine the current operating status of the wind turbine; In response to the current operating state of the wind turbine generator set being a power-limited state and the SOC value of the energy storage system not exceeding a first preset threshold, charging control is performed on the energy storage system of the wind turbine generator set; In response to the current operating state of the wind turbine generator set being a non-power-limited state and the SOC value of the energy storage system exceeding a second preset threshold, discharging control is performed on the energy storage system of the wind turbine generator set, Wherein, the first preset threshold is greater than the second preset threshold.

2. The control method of the energy storage system of the wind turbine generator set according to claim 1, characterized in that: The control method further comprises: Determining a current operating mode of the energy storage system; In response to the current working mode of the energy storage system being a stand-alone mode, the main control of the wind turbine generator set executes the charging control and the discharging control; In response to the current working mode of the energy storage system being a non-stand-alone mode, the charging control and the discharging control are executed by an energy management platform of the station where the wind turbine generator set is located.

3. The control method of the energy storage system of the wind turbine generator set according to claim 1, characterized in that: In response to the current operating state of the wind turbine generator set being a non-power-limited state and the SOC value of the energy storage system exceeding a second preset threshold, the step of discharging the energy storage system of the wind turbine generator set includes: In response to the current operating state of the wind turbine generator set being a non-power-limited state, the SOC value of the energy storage system exceeding a second preset threshold and the energy storage system not being in a long-term static state, discharge control is performed on the energy storage system of the wind turbine generator set.

4. The control method of the energy storage system of the wind turbine generator set according to claim 3, characterized in that: In response to the current operating state of the wind turbine generator set being a non-power-limited state and the SOC value of the energy storage system exceeding a second preset threshold, the step of discharging the energy storage system of the wind turbine generator set further includes: In response to the current operating state of the wind turbine generator set being a non-power-limited state, the SOC value of the energy storage system exceeding a second preset threshold and the energy storage system being in a long-term static state, no discharge control is performed on the energy storage system of the wind turbine generator set.

5. The control method of the energy storage system of the wind turbine generator set according to claim 3, characterized in that: The steps of discharging control of the energy storage system of the wind turbine generator set include: Calculating a first given power of the energy storage system, wherein the first given power is equal to the rated power of the wind turbine generator set minus the current real-time power of the wind turbine generator set; In response to the first given power being less than or equal to the dischargeable capacity of the energy storage system, issuing a control instruction corresponding to the first given power to the energy storage system; In response to the first given power being greater than a dischargeable capacity of the energy storage system, a control instruction corresponding to the dischargeable capacity is issued to the energy storage system.

6. The control method of the energy storage system of the wind turbine generator set according to claim 5, characterized in that: When the current working mode of the energy storage system is the stand-alone mode, the first given power is assigned to the control instruction, so that the control instruction corresponding to the first given power is sent to the energy storage system.

7. The control method of the energy storage system of a wind turbine generator set according to claim 1, characterized in that: The steps of charging control of the energy storage system of the wind turbine generator set include: Calculating a second given power of the energy storage system, where the second given power is equal to the power limit value of the energy management platform minus the current real-time power of the wind turbine generator set; In response to the second given power being less than or equal to the chargeable capacity of the energy storage system, issuing a control instruction corresponding to the second given power to the energy storage system; In response to the second given power being greater than the chargeable capacity of the energy storage system, a control instruction corresponding to the chargeable capacity is issued to the energy storage system.

8. The control method of the energy storage system of the wind turbine generator set according to claim 7, characterized in that: When the current mode of the energy storage system is the stand-alone mode, the energy storage given power of the energy management platform of the site where the wind turbine generator set is located is assigned to the control instruction, so that the control instruction corresponding to the second given power is sent to the energy storage system.

9. The control method of the energy storage system of a wind turbine generator set according to any one of claims 1 to 8, characterized in that: The control method further comprises: In response to at least one of the following situations: the energy storage enable state is zero, the energy storage fault state is an energy storage emergency shutdown, the energy storage fault state is an energy storage normal shutdown fault, the energy storage stage is a fault stage, and the wind turbine converter grid side is not in a modulation state, the energy storage system is controlled to shut down.

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

11. A control device for an energy storage system of a wind turbine generator set, characterized in that: include: A state determination unit, which determines the current operating state of the wind turbine generator set; The control unit controls charging of the energy storage system of the wind generator set in response to the current operating state of the wind generator set being a power-limited state and the SOC value of the energy storage system not exceeding a first preset threshold value; controls discharging of the energy storage system of the wind generator set in response to the current operating state of the wind generator set being a non-power-limited state and the SOC value of the energy storage system exceeding a second preset threshold value, Wherein, the first preset threshold is greater than the second preset threshold.

12. A controller for a wind turbine generator set, characterized in that: The invention comprises a processor and a computer-readable storage medium, wherein the computer-readable storage medium stores a program or an instruction, and when the program or the instruction is executed by the processor, the control method according to any one of claims 1 to 9 is implemented.

13. A wind turbine generator set, characterized in that: Comprising a controller according to claim 12.

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