Wind power plant electrochemical energy storage device control method and device

Abstract

The invention provides a control method and device for an electrochemical energy storage device of a wind power plant. The control method comprises the steps of obtaining historical output power, a charge state value of the electrochemical energy storage device, a judgment threshold value, actual output power at a target timestamp and a first power smooth output reference value; determining a charging and discharging limit coefficient based on the charge state value and a judgment threshold value, and determining a power threshold value; determining a second power smooth output reference value based on the power threshold, the actual output power and the first power smooth output reference value; and performing smooth output control based on the second power smooth output reference value. Through the method disclosed by the invention, the stability of wind power output can be greatly improved, the harmonic content is reduced, the wind power is closer to conventional energy, the wind power can better participate in the scheduling arrangement of a power grid, the competitiveness of a wind power plant in an electric power market is improved, and large-scale grid connection and consumption of the wind power are promoted; the control effect on the wind power plant and the robustness of the system are improved, the control cost can be reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind power generation control, and in particular to a control method and device for an electrochemical energy storage device in a wind farm. Background Art

[0002] As the global demand for clean energy increases, wind power, as a green and renewable energy, is gradually becoming an important part of the energy structure. Different from conventional energy (such as thermal power and hydropower), wind power has the characteristics of randomness, volatility and intermittence, and the output of wind power is unstable. With the large-scale grid connection of wind power, it will inevitably bring challenges to the dispatching and stable operation of the power grid.

[0003] To reduce the volatility of wind farm output power, the following methods can be used: (1) Reasonable planning of the location and spacing of wind turbines in the wind farm can reduce the impact of the wake effect and make the overall output power of the wind farm more stable; (2) Adopting advanced wind turbine control strategies, such as variable speed-variable pitch control, can automatically adjust the operating status of the wind turbine according to the real-time changes in wind speed, making the wind turbine output power more stable; (3) Wind power and other energy sources (such as solar energy, hydropower, etc.) form a complementary power generation system, so as to make the power output of the entire system more stable. However, no matter which of the above methods is used, there will still be a certain degree of volatility in wind power output. Summary of the invention

[0004] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, an object of the present disclosure is to provide a control method for an electrochemical energy storage device in a wind farm.

[0006] A second objective of the present disclosure is to provide a control device for an electrochemical energy storage device in a wind farm.

[0007] A third objective of the present disclosure is to provide an electronic device.

[0008] A fourth object of the present disclosure is to provide a non-transitory computer-readable storage medium.

[0009] A fifth object of the present disclosure is to provide a computer program product.

[0010] To achieve the above-mentioned purpose, the first aspect of the present disclosure proposes a method for controlling an electrochemical energy storage device in a wind farm, comprising: obtaining the historical output power of the wind turbine group within a target time period before a target timestamp and the charge state values ​​of all electrochemical energy storage devices, and obtaining a judgment threshold, the actual output power at the target timestamp, and a first power smooth output reference value; determining the charge and discharge limit coefficient of the electrochemical energy storage device based on the charge state value and the judgment threshold, and determining the power threshold of the wind turbine group at the target timestamp based on the charge and discharge limit coefficient; determining the second power smooth output reference value of the wind turbine group at a subsequent timestamp of the target timestamp based on the power threshold, the actual output power, and the first power smooth output reference value; and performing smooth output control on the electrochemical energy storage device based on the second power smooth output reference value.

[0011] According to one embodiment of the present disclosure, the method of determining the second power smooth output reference value of the wind turbine group at a subsequent timestamp of the target timestamp based on the power threshold, the actual output power and the first power smooth output reference value includes: subtracting the actual output power from the first power smooth output reference value to calculate a power deviation; comparing the power deviation with the judgment threshold; determining a target smooth output control strategy from the candidate smooth output control strategies of the electrochemical energy storage device based on the comparison result, and determining the second power smooth output reference value based on the target smooth output control strategy.

[0012] According to one embodiment of the present disclosure, the judgment threshold includes a first judgment threshold and a second judgment threshold, and the target smooth output control strategy is determined from the candidate smooth output control strategies of the electrochemical energy storage device based on the comparison result, and the second power smooth output reference value is determined based on the target smooth output control strategy, including: in response to the power deviation being greater than or equal to the first judgment threshold, and less than or equal to the second judgment threshold, determining that the target smooth output control strategy is the second power smooth output reference value of the subsequent timestamp is the same as the first power smooth output reference value, and adjusting the charge and discharge target power of the electrochemical energy storage device at the target timestamp is a power deviation value; or, in response to the power deviation being greater than the second judgment threshold, determining that the target smooth output control strategy is to adjust the second power smooth output reference value of the subsequent timestamp downward to the target downward adjustment value, and adjusting the charge and discharge target power of the electrochemical energy storage device at the target timestamp to the maximum discharge power of each electrochemical energy storage device in this period; or, in response to the power deviation being less than the first judgment threshold, determining that the target smooth output control strategy is to adjust the second power smooth output reference value of the subsequent timestamp upward to the target upward adjustment value, and adjusting the charge and discharge target power of the electrochemical energy storage device at the target timestamp to the maximum charging power of each electrochemical energy storage device in this period.

[0013] According to one embodiment of the present disclosure, determining the target downward adjustment value includes: obtaining a smooth output reference power conversion basic coefficient, and comparing the charge state value of the electrochemical energy storage device with a first state judgment threshold; determining the target downward adjustment coefficient of the electrochemical energy storage device at the target timestamp based on the comparison result and the smooth output reference power conversion basic coefficient; and calculating the target downward adjustment value based on the first power smooth output reference value and the target downward adjustment coefficient.

[0014] According to one embodiment of the present disclosure, the target downward adjustment value is calculated based on the first power smoothing output reference value and the target downward adjustment coefficient, including: calculating the time difference between the target timestamp and the subsequent timestamp; multiplying the target downward adjustment coefficient by the time difference, and subtracting the first power smoothing output reference value from the product to calculate the target downward adjustment value.

[0015] According to one embodiment of the present disclosure, determining the target upward adjustment value includes: obtaining a smooth output reference power conversion basic coefficient, and comparing the charge state value of the electrochemical energy storage device with a second state judgment threshold; determining the target upward adjustment coefficient of the electrochemical energy storage device at the target timestamp based on the comparison result and the smooth output reference power conversion basic coefficient; and calculating the target upward adjustment value based on the first power smooth output reference value and the target upward adjustment coefficient.

[0016] According to one embodiment of the present disclosure, the target increase value is calculated based on the first power smoothing output reference value and the target increase coefficient, including: calculating the time difference between the target timestamp and the subsequent timestamp; multiplying the target increase coefficient by the time difference, and adding the first power smoothing output reference value and the product to calculate the target increase value.

[0017] To achieve the above-mentioned purpose, the second aspect embodiment of the present disclosure proposes a wind farm electrochemical energy storage device control device, including: an acquisition module, used to obtain the historical output power of the wind turbine group within the target time period before the target timestamp and the charge state values ​​of all electrochemical energy storage devices, and obtain the judgment threshold, the actual output power at the target timestamp and the first power smooth output reference value; a determination module, used to determine the charge and discharge limit coefficient of the electrochemical energy storage device based on the charge state value and the judgment threshold, and determine the power threshold of the wind turbine group at the target timestamp based on the charge and discharge limit coefficient; a calculation module, used to determine the second power smooth output reference value of the wind turbine group at a subsequent timestamp of the target timestamp based on the power threshold, the actual output power and the first power smooth output reference value; a control module, used to perform smooth output control on the electrochemical energy storage device based on the second power smooth output reference value.

[0018] To achieve the above-mentioned purpose, the third aspect embodiment of the present disclosure proposes an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the wind farm electrochemical energy storage device control method as described in the first aspect embodiment of the present disclosure.

[0019] To achieve the above objectives, the fourth aspect of the present disclosure proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to implement the wind farm electrochemical energy storage device control method as described in the first aspect of the present disclosure.

[0020] To achieve the above objectives, the fifth embodiment of the present disclosure proposes a computer program product, including a computer program, which, when executed by a processor, is used to implement the wind farm electrochemical energy storage device control method as described in the first embodiment of the present disclosure.

[0021] By integrating the historical output power data of wind turbines through the method disclosed in the present invention and designing and implementing the control strategy of the energy storage system in a targeted manner, the stability of wind power output can be greatly improved, the harmonic content can be reduced, and it can be made closer to conventional energy, so that wind power can better participate in the dispatching of the power grid, improve the competitiveness of wind farms in the power market, promote large-scale grid connection and consumption of wind power, improve the management and control effect of wind farms and the robustness of the system, and at the same time reduce the management and control costs and increase the life of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a control method for an electrochemical energy storage device in a wind farm according to an embodiment of the present disclosure;

[0023] Figure 2 is a schematic structural diagram of a wind farm according to an embodiment of the present disclosure;

[0024] Figure 3 is a schematic diagram of another wind farm electrochemical energy storage device control method according to an embodiment of the present disclosure;

[0025] Figure 4 is a schematic diagram of a flow chart of determining a first target control strategy from candidate control strategies for an electrochemical energy storage device according to an embodiment of the present disclosure;

[0026] Figure 5 is a schematic diagram of stabilizing a DC bus voltage through current loop control according to an embodiment of the present disclosure;

[0027] Figure 6 It is a schematic diagram of a calculation process in which the input is the three-phase voltage measured by the power grid and the output is the frequency and phase angle of the power grid according to an embodiment of the present disclosure;

[0028] Figure 7 is a schematic diagram of a control device for an electrochemical energy storage device in a wind farm according to an embodiment of the present disclosure;

[0029] Figure 8 is a schematic diagram of an electronic device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0031] The acquisition, storage, use, and processing of data in the technical solution disclosed in this disclosure are in compliance with the relevant provisions of relevant laws and regulations.

[0032] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned, and they should be considered as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0033] Figure 1 is a schematic diagram of a control method for an electrochemical energy storage device in a wind farm according to an embodiment of the present disclosure, such as Figure 1 As shown, the wind farm electrochemical energy storage device control method includes the following steps:

[0034] S101, obtaining the historical output power of the wind turbine set and the charge state values ​​of all electrochemical energy storage devices within a target time period before a target timestamp, and obtaining a judgment threshold, the actual output power at the target timestamp, and a first power smoothing output reference value.

[0035] The wind farm electrochemical energy storage device control method of the embodiment of the present application can be applied to the scenario of wind farm automation control. The executor of the wind farm electrochemical energy storage device control of the embodiment of the present application can be the wind farm electrochemical energy storage device control device of the embodiment of the present application, and the wind farm electrochemical energy storage device control device can be set on an electronic device.

[0036] In the embodiments of the present disclosure, a wind farm may include polymorphic wind turbines, for example, Figure 2 As shown in the figure, there are n collectors in the wind farm, each of which is equipped with m wind turbines. At the end of each collector, the wind turbine box is transformed into a low-voltage AC side and an electrochemical energy storage device is incorporated. The overall layout of the collector and its energy storage device is shown in Figure 1 The wind turbine is mainly composed of 1-power generation system (including impeller, transmission chain and generator), 2-converter and 3-box transformer. 4-energy storage device is mainly composed of battery system 4-1, inverter 4-2 and circuit breaker 4-3. Each collector is connected to the 66kV AC bus of the booster station through 6-circuit breaker, and then the voltage is increased to 220kV through 8-boosting transformer before being connected to the grid.

[0037] It should be noted that the target time period is designed in advance and can be changed according to actual design needs, and no limitation is made here. For example, it can be 10 minutes before the target timestamp, or 1 day before the target timestamp, etc.

[0038] In the embodiment of the present disclosure, the judgment threshold is a critical value for judging the working state of the electrochemical energy storage device. The judgment threshold is designed in advance and can be changed according to actual design needs, and no limitation is made here.

[0039] It should be noted that the electrochemical energy storage device may include a variety of different working states, so there may be multiple corresponding judgment thresholds, which need to be determined according to actual conditions.

[0040] The power smoothing output reference value refers to the target output curve or threshold set in wind power smoothing control, which is used to guide wind turbines or wind farms on how to adjust their output power to achieve a more stable and predictable power supply. This reference value can be set according to different needs and conditions, and is usually optimized in combination with historical data, weather forecasts, and grid requirements.

[0041] In the embodiment of the present disclosure, the first power smoothing output reference value may be set in advance, or may be derived based on the operating state of the electrochemical energy storage device at the preceding timestamp of the target timestamp, and no limitation is made here.

[0042] S102, determining a charge and discharge limit coefficient of the electrochemical energy storage device based on the charge state value and the judgment threshold, and determining a power threshold of the wind turbine generator set at a target timestamp based on the charge and discharge limit coefficient.

[0043] It should be noted that the charge and discharge limit factor is an important parameter to measure the charge and discharge speed of the battery. It defines how long it takes for the battery to be fully charged or discharged. This factor has a direct impact on the performance, life and safety of electrochemical energy storage devices.

[0044] Under different operating conditions, the charge and discharge limit coefficients of the electrochemical energy storage device are different. Therefore, in the embodiment of the present disclosure, after the charge state value and the judgment threshold are obtained, the charge and discharge limit coefficients of the electrochemical energy storage device are determined based on the charge state value and the judgment threshold. This can provide accurate limit conditions for subsequent parameter value changes.

[0045] S103: Determine a second power smoothing output reference value of the wind turbine generator system at a subsequent timestamp of the target timestamp based on the power threshold, the actual output power and the first power smoothing output reference value.

[0046] In the embodiment of the present disclosure, there may be multiple methods for determining the second power smoothing output reference value of the wind turbine generator set at a subsequent timestamp of the target timestamp, which are not limited here.

[0047] In one possible implementation, the power threshold, the actual output power and the first power smooth output reference value can be calculated by a power smooth output reference value algorithm to obtain the second power smooth output reference value. It should be noted that the power smooth output reference value algorithm is designed in advance and can be changed according to actual design needs, and no limitation is made here.

[0048] In another possible implementation method, the power threshold, actual output power and the first power smooth output reference value can also be processed by a power smooth output reference value calculation model to generate a second power smooth output reference value of the wind turbine at a subsequent timestamp of the target timestamp. The power smooth output reference value calculation model is trained in advance and stored in the storage space of the electronic device to facilitate retrieval and use when needed.

[0049] S104, performing smooth output control on the electrochemical energy storage device based on the second power smooth output reference value.

[0050] In the disclosed embodiment, the historical output power of the wind turbine group within the target time period before the target timestamp and the charge state values ​​of all electrochemical energy storage devices are first obtained, and the judgment threshold, the actual output power at the target timestamp and the first power smooth output reference value are obtained. Then, the charge and discharge limit coefficient of the electrochemical energy storage device is determined based on the charge state value and the judgment threshold, and the power threshold of the wind turbine group at the target timestamp is determined based on the charge and discharge limit coefficient. Then, based on the power threshold, the actual output power and the first power smooth output reference value, the second power smooth output reference value of the wind turbine group at the subsequent timestamp of the target timestamp is determined. Finally, the electrochemical energy storage device is smoothly output controlled based on the second power smooth output reference value. Therefore, by integrating the historical output power data of wind turbines through the method disclosed in the present invention, and designing and implementing the control strategy of the energy storage system in a targeted manner, the stability of wind power output can be greatly improved, the harmonic content can be reduced, and it can be closer to conventional energy, so that wind power can better participate in the dispatching of the power grid, improve the competitiveness of wind farms in the power market, promote large-scale grid connection and consumption of wind power, improve the management and control effect of wind farms and the robustness of the system, and at the same time reduce the management and control costs and increase the life of equipment.

[0051] In the embodiment of the present disclosure, according to the SOC of each electrochemical energy storage device B,i Determine the charge and discharge limit coefficient K B,i , for example, can be expressed as follows:

[0052]

[0053] Among them, K B_d,i is the discharge coefficient of the electrochemical energy storage device, when The discharge coefficient used for timing; K B_c,i is the charge coefficient of the electrochemical energy storage device, when When it is negative, the charging coefficient is used. It should be noted that a, b, c, d in this formula are pre-designed thresholds for judging power, and e is a constant function. a, b, c, d and e can be changed according to actual design needs, and no limitation is made here. For example, a, b, c, d and e can be 0.1, 0.2, 0.8, 0.9 and 10 respectively.

[0054] According to the SOC of each supercapacitor energy storage device S,i Determine the charge and discharge limit coefficient K S,i , which can be expressed as follows:

[0055]

[0056] Among them, K S_d,i is the discharge coefficient of the supercapacitor energy storage device, when The discharge coefficient used for timing; K S_c,i is the charging coefficient of the supercapacitor energy storage device, when When it is negative, the charging coefficient is used. It should be noted that f, g, h, i in this formula are pre-designed thresholds for judging power, j is a constant function, and f, g, h, i and j can be changed according to actual design needs, without any limitation here. For example, f, g, h, i and j can be 0.1, 0.2, 0.8, 0.9 and 10 respectively.

[0057] In the above embodiment, based on the power threshold, the actual output power and the first power smoothing output reference value, the second power smoothing output reference value of the wind turbine generator set at the subsequent timestamp of the target timestamp is determined, and the second power smoothing output reference value of the wind turbine generator set at the subsequent timestamp of the target timestamp can also be determined by Figure 3 Explaining further, the method includes:

[0058] S301, subtracting the actual output power from the first power smoothing output reference value to calculate and obtain the power deviation.

[0059] S302: Compare the power deviation with a judgment threshold.

[0060] S303 , determining a target smooth output control strategy from candidate smooth output control strategies of the electrochemical energy storage device based on the comparison result, and determining a second power smooth output reference value based on the target smooth output control strategy.

[0061] In the embodiments of the present disclosure, Figure 4As shown, the judgment threshold includes a first judgment threshold and a second judgment threshold, a target smooth output control strategy is determined from candidate smooth output control strategies of the electrochemical energy storage device based on the comparison result, and a second power smooth output reference value is determined based on the target smooth output control strategy, in response to the power deviation being greater than or equal to the first judgment threshold and less than or equal to the second judgment threshold, the target smooth output control strategy is determined to be the second power smooth output reference value of the subsequent timestamp is the same as the first power smooth output reference value, and the charge and discharge target power of the electrochemical energy storage device at the target timestamp is adjusted to the power deviation value, or In response to the power deviation being greater than the second judgment threshold, the target smooth output control strategy is determined to be that the second power smooth output reference value of the subsequent timestamp is adjusted downward to the target downward adjustment value, and the charge and discharge target power of the electrochemical energy storage device at the target timestamp is adjusted to the maximum discharge power of each electrochemical energy storage device in this period, or in response to the power deviation being less than the first judgment threshold, the target smooth output control strategy is determined to be that the second power smooth output reference value of the subsequent timestamp is adjusted upward to the target upward adjustment value, and the charge and discharge target power of the electrochemical energy storage device at the target timestamp is adjusted to the maximum charging power of each electrochemical energy storage device in this period.

[0062] It should be noted that the first judgment threshold and the second judgment threshold are critical values ​​for judging the current state of the electrochemical energy storage device. The first judgment threshold and the second judgment threshold are designed in advance and can be changed according to actual design needs. No limitation is made here.

[0063] In the embodiment of the present disclosure, the first judgment threshold is the maximum discharge power of the electrochemical energy storage device, and the second judgment threshold is the maximum charge power of the electrochemical energy storage device.

[0064] In the embodiment of the present disclosure, the formula for calculating the first judgment threshold and the second judgment threshold is:

[0065]

[0066] in, is the maximum discharge power of electrochemical energy storage device i in time period j, is the maximum charging power of electrochemical energy storage device i in time period j.

[0067] The formula for calculating the power deviation is:

[0068]

[0069] in, is the smoothed output reference power of the ith collector line in the time period of time j, is the actual power output of the i-th collector line in the time period of time j. According to the deviation value, the power smoothing output reference value of each collector line and the energy storage charging and discharging are controlled in three states.

[0070] In one possible implementation, taking the first 10 minutes as an example, the average output power of each collector in the first 10 minutes can be counted and used as the initial reference value for the smooth output power of each collector, as follows:

[0071]

[0072] Among them, assuming that the first control time period is j, P is the power smoothing output reference value of the i-th collector in the j-time period; L,i (jm) is the average output power of the ith collector line in the jm time period, and each time period corresponds to 1 minute.

[0073] In the embodiment of the present disclosure, The power smoothing output reference value of each wind turbine and the charging and discharging of electrochemical energy storage are controlled in three states.

[0074] when , the power smoothing output reference value of the next control period remains unchanged, that is,

[0075]

[0076] The target power of each energy storage device in this control period is the power deviation value, that is,

[0077]

[0078] when When the electrochemical energy storage SOC B,i (j) Calculate its target downward adjustment coefficient.

[0079] In an embodiment of the present disclosure, the target downward adjustment value is calculated based on the first power smoothing output reference value and the target downward adjustment coefficient. The time difference between the target timestamp and the subsequent timestamp can be first calculated, and then the target downward adjustment coefficient is multiplied by the time difference, and the first power smoothing output reference value is subtracted from the product to calculate the target downward adjustment value.

[0080] In the embodiment of the present disclosure, to determine the target downward adjustment value, the smoothed output reference power conversion basic coefficient can be first obtained, and the charge state value of the electrochemical energy storage device can be compared with the first state judgment threshold value. Then, based on the comparison result and the smoothed output reference power conversion basic coefficient, the target downward adjustment coefficient of the electrochemical energy storage device at the target timestamp is determined. Finally, the target downward adjustment value is calculated based on the first power smoothed output reference value and the target downward adjustment coefficient.

[0081] In the embodiment of the present disclosure, the formula for determining the target down-adjustment coefficient is:

[0082]

[0083] Among them, k1(j) is the target down-regulation coefficient of the i-th wind turbine group in the time period of time j, a is a constant function, b is the power judgment threshold, k0 is the basic coefficient of the smooth output reference power conversion, SOC B,i is the charge state value of the electrochemical energy storage device of the i-th wind turbine.

[0084] It should be noted that the constant function a is designed in advance and can be set according to actual control needs, and no limitation is made here. For example, the constant function a can take a value of 50. When the SOC is equal to 0.1, the power smoothing rate increases by 5 times. In this way, the rate of power change can be controlled by controlling the value of the constant function a, thereby achieving different control requirements.

[0085] After obtaining the target reduction coefficient, the target reduction value is calculated based on the first power smoothing output reference value and the target reduction coefficient. The time difference between the target timestamp and the subsequent timestamp is first calculated, and then the target reduction coefficient is multiplied by the time difference, and the first power smoothing output reference value is subtracted from the product to calculate the target reduction value.

[0086] The target downward adjustment value of the subsequent timestamp is calculated using the following formula:

[0087]

[0088] Among them, ΔT is the step length of the control period. The target power of charging and discharging of each electrochemical energy storage device in this control period is the maximum discharge power of each electrochemical energy storage device in this period, as follows:

[0089]

[0090] when To determine the target upward adjustment value, the smoothed output reference power conversion basic coefficient can be first obtained, and the charge state value of the electrochemical energy storage device is compared with the second state judgment threshold value, and then the target upward adjustment coefficient of the electrochemical energy storage device at the target timestamp is determined based on the comparison result and the smoothed output reference power conversion basic coefficient, and finally the target upward adjustment value is calculated based on the first power smoothed output reference value and the target upward adjustment coefficient.

[0091] According to the SOC of each electrochemical energy storage B,i (j) Calculate the target upward adjustment coefficient. The formula for determining the target upward adjustment coefficient is:

[0092]

[0093] Among them, k2(j) is the target upward adjustment coefficient of the i-th wind turbine group in the time period of time j, c is a constant function, d is the power judgment threshold, k0 is the basic coefficient of the smooth output reference power conversion, SOC B,i is the charge state value of the electrochemical energy storage device of the i-th wind turbine.

[0094] After obtaining the target increase coefficient, the target increase value is calculated based on the first power smoothing output reference value and the target increase coefficient. The time difference between the target timestamp and the subsequent timestamp is first calculated, and then the target increase coefficient is multiplied by the time difference, and the first power smoothing output reference value is added to the product to calculate the target increase value.

[0095] The target upward adjustment value of the subsequent timestamp can be calculated using the following formula:

[0096]

[0097] The target power for charging and discharging each electrochemical energy storage device during this control period is the maximum charging power of each electrochemical energy storage device during this period, as follows:

[0098]

[0099] In one embodiment of the present disclosure, each energy storage device uses a grid-based control strategy to track the target power. See also Figure 5 , mainly including a phase-locked loop phase angle calculation module 5, a current outer loop calculation module 6 and a current inner loop calculation module 7.

[0100] The input of the phase-locked loop phase angle calculation module 5 is the three-phase voltage measured by the power grid, and the output is the power grid frequency and phase angle. The calculation process is shown in Figure 6 First, set the initial phase to θ, substitute it into the dq coordinate transformation, and calculate the grid voltage u od and u oq The value is as follows:

[0101]

[0102] will u oq Substitute into the PI formula to calculate the grid frequency. The formula is as follows:

[0103]

[0104] Integrate ω to calculate the grid phase angle, the formula is as follows:

[0105]

[0106] If u oqIf it is not close to 0, substitute the calculated phase angle into equations (13) to (16) to recalculate the grid frequency and phase angle until u oq Close to 0, locking the grid frequency and phase angle.

[0107] The current outer loop calculation module 6 includes power calculation 6-1 and PI calculation 6-2. The input of this module is the three-phase voltage u measured by the power grid. oabc , energy storage output three-phase current i abc , Active power reference value Reactive power reference value The output is the energy storage PCC point dq axis current control target value i dq * First, the three-phase voltage u measured by the power grid is converted into oabc , three-phase current i abc Convert to u odq and i dq , and then substitute it into the following formula to calculate the grid measured active power P B,i and reactive Q B,i .

[0108]

[0109] Then P B,i , Q B,i , and Substitute into the PI formula to calculate the dq axis current control target value i at the energy storage PCC point dq * , the formula is as follows:

[0110]

[0111] The current inner loop calculation module 7 includes PI calculations 7-1 and 7-2, dq coordinate transformation 7-3 and dq coordinate inverse transformation 7-4. First, the inverter output three-phase current measurement value i abc Converted into dq axis current i through dq transformation dq Then, the voltage value corresponding to the current loop is calculated by PI, and the formula is as follows:

[0112]

[0113] Afterwards, the inverter dq axis voltage control target value is obtained by introducing the dq axis cross-influence term, and the formula is as follows:

[0114]

[0115] Finally, the inverter dq axis voltage control target value u dq * Substitute the dq coordinate inverse transformation to calculate the inverter modulation voltage control target value uabc * , the formula is as follows:

[0116]

[0117] Corresponding to the wind farm electrochemical energy storage device control methods provided in the above-mentioned embodiments, an embodiment of the present disclosure further provides a wind farm electrochemical energy storage device control device. Since the wind farm electrochemical energy storage device control device provided in the embodiment of the present disclosure corresponds to the wind farm electrochemical energy storage device control methods provided in the above-mentioned embodiments, the implementation methods of the above-mentioned wind farm electrochemical energy storage device control methods are also applicable to the wind farm electrochemical energy storage device control device provided in the embodiment of the present disclosure, and will not be described in detail in the following embodiments.

[0118] Figure 7 is a schematic diagram of a wind farm electrochemical energy storage device control device according to one embodiment of the present disclosure, such as Figure 7 As shown, the wind farm electrochemical energy storage device control device 700 includes: an acquisition module 710 , a determination module 720 , a calculation module 730 and a control module 740 .

[0119] The acquisition module 710 is used to obtain the historical output power of the wind turbine group and the charge state values ​​of all electrochemical energy storage devices in the target time period before the target timestamp, and obtain the judgment threshold, the actual output power at the target timestamp and the first power smoothing output reference value.

[0120] The determination module 720 is used to determine the charge and discharge limit coefficient of the electrochemical energy storage device based on the charge state value and the judgment threshold, and determine the power threshold of the wind turbine at the target time stamp based on the charge and discharge limit coefficient.

[0121] The calculation module 730 is used to determine a second power smoothing output reference value of the wind turbine generator system at a subsequent timestamp of the target timestamp based on the power threshold, the actual output power and the first power smoothing output reference value.

[0122] The control module 740 is used to perform smooth output control on the electrochemical energy storage device based on the second power smooth output reference value.

[0123] According to one embodiment of the present disclosure, based on a power threshold, actual output power and a first power smooth output reference value, a second power smooth output reference value of a wind turbine generator system at a subsequent timestamp of a target timestamp is determined, including: subtracting the actual output power from the first power smooth output reference value to calculate a power deviation; comparing the power deviation with a judgment threshold; determining a target smooth output control strategy from candidate smooth output control strategies of an electrochemical energy storage device based on the comparison result, and determining a second power smooth output reference value based on the target smooth output control strategy.

[0124] According to one embodiment of the present disclosure, the judgment threshold includes a first judgment threshold and a second judgment threshold, and a target smooth output control strategy is determined from candidate smooth output control strategies of the electrochemical energy storage device based on a comparison result, and a second power smooth output reference value is determined based on the target smooth output control strategy, including: in response to a power deviation being greater than or equal to the first judgment threshold and less than or equal to the second judgment threshold, determining that the second power smooth output reference value of the target smooth output control strategy for a subsequent timestamp is the same as the first power smooth output reference value, and adjusting the charge and discharge target power of the electrochemical energy storage device at the target timestamp to the power Deviation value; or, in response to the power deviation being greater than the second judgment threshold, determining that the target smooth output control strategy is to adjust the second power smooth output reference value of the subsequent timestamp downward to the target downward adjustment value, and adjusting the charge and discharge target power of the electrochemical energy storage device at the target timestamp to the maximum discharge power of each electrochemical energy storage device in this period; or, in response to the power deviation being less than the first judgment threshold, determining that the target smooth output control strategy is to adjust the second power smooth output reference value of the subsequent timestamp upward to the target upward adjustment value, and adjusting the charge and discharge target power of the electrochemical energy storage device at the target timestamp to the maximum charging power of each electrochemical energy storage device in this period.

[0125] According to one embodiment of the present disclosure, determining a target downward adjustment value includes: obtaining a smoothed output reference power conversion basic coefficient, and comparing a charge state value of an electrochemical energy storage device with a first state judgment threshold; determining a target downward adjustment coefficient of the electrochemical energy storage device at a target timestamp based on the comparison result and the smoothed output reference power conversion basic coefficient; and calculating the target downward adjustment value based on the first power smoothed output reference value and the target downward adjustment coefficient.

[0126] According to one embodiment of the present disclosure, a target reduction value is calculated based on a first power smoothing output reference value and a target reduction coefficient, including: calculating a time difference between a target timestamp and a subsequent timestamp; multiplying the target reduction coefficient by the time difference, and subtracting the first power smoothing output reference value from the product to calculate the target reduction value.

[0127] According to one embodiment of the present disclosure, determining a target upward adjustment value includes: obtaining a smooth output reference power conversion basic coefficient, and comparing a charge state value of an electrochemical energy storage device with a second state judgment threshold; determining a target upward adjustment coefficient of the electrochemical energy storage device at a target timestamp based on the comparison result and the smooth output reference power conversion basic coefficient; and calculating the target upward adjustment value based on the first power smooth output reference value and the target upward adjustment coefficient.

[0128] According to one embodiment of the present disclosure, a target increase value is calculated based on a first power smoothing output reference value and a target increase coefficient, including: calculating a time difference between a target timestamp and a subsequent timestamp; multiplying the target increase coefficient by the time difference, and adding the first power smoothing output reference value to the product to calculate the target increase value.

[0129] Therefore, by integrating the historical output power data of wind turbines through the method disclosed in the present invention, and designing and implementing the control strategy of the energy storage system in a targeted manner, the stability of wind power output can be greatly improved, the harmonic content can be reduced, and it can be closer to conventional energy, so that wind power can better participate in the dispatching of the power grid, improve the competitiveness of wind farms in the power market, promote large-scale grid connection and consumption of wind power, improve the management and control effect of wind farms and the robustness of the system, and at the same time reduce the management and control costs and increase the life of equipment.

[0130] In order to implement the above embodiment, the present disclosure further provides an electronic device 800, Figure 8 is a schematic diagram of an electronic device according to an embodiment of the present disclosure, such as Figure 8 As shown, the electronic device 800 includes: a processor 801 and a memory 802 that is communicatively connected to the processor, the memory 802 stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor 801 to implement the present disclosure. Figure 1-Figure 6 A method for controlling an electrochemical energy storage device in a wind farm according to an embodiment.

[0131] In order to implement the above embodiments, the present disclosure also provides a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable the computer to implement the above embodiments. Figure 1-Figure 6 A method for controlling an electrochemical energy storage device in a wind farm according to an embodiment.

[0132] In order to implement the above embodiments, the present disclosure also provides a computer program product, including a computer program. When the computer program is executed by a processor, the computer program implements the above embodiments. Figure 1-Figure 6 A method for controlling an electrochemical energy storage device in a wind farm according to an embodiment.

[0133] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0134] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0135] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0136] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0137] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0138] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that contains, stores, communicates, propagates or transmits a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0139] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0140] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0141] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0142] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A control method for an electrochemical energy storage device in a wind farm, characterized in that: include: Obtain the historical output power of the wind turbine generator set and the charge state values ​​of all electrochemical energy storage devices within the target time period before the target timestamp, and obtain the judgment threshold, the actual output power at the target timestamp, and the first power smoothing output reference value; Determine a charge and discharge limit coefficient of the electrochemical energy storage device based on the charge state value and the judgment threshold, and determine a power threshold of the wind turbine generator set at the target timestamp based on the charge and discharge limit coefficient; Determine, based on the power threshold, the actual output power and the first power smoothing output reference value, a second power smoothing output reference value of the wind turbine generator set at a subsequent timestamp of the target timestamp; The electrochemical energy storage device is smoothly output controlled based on the second power smooth output reference value.

2. The method according to claim 1, characterized in that The determining, based on the power threshold, the actual output power and the first power smoothing output reference value, a second power smoothing output reference value of the wind turbine generator set at a subsequent timestamp of the target timestamp comprises: Subtracting the actual output power from the first power smoothing output reference value to calculate and obtain a power deviation; comparing the power deviation with the judgment threshold; A target smooth output control strategy is determined from candidate smooth output control strategies of the electrochemical energy storage device based on the comparison result, and the second power smooth output reference value is determined based on the target smooth output control strategy.

3. The method according to claim 2, characterized in that The judgment threshold includes a first judgment threshold and a second judgment threshold, and the step of determining a target smooth output control strategy from candidate smooth output control strategies of the electrochemical energy storage device based on the comparison result, and determining the second power smooth output reference value based on the target smooth output control strategy includes: In response to the power deviation being greater than or equal to the first judgment threshold and less than or equal to the second judgment threshold, determining that the target smooth output control strategy is that the second power smooth output reference value of the subsequent timestamp is the same as the first power smooth output reference value, and adjusting the charge and discharge target power of the electrochemical energy storage device at the target timestamp to the power deviation value; or, In response to the power deviation being greater than the second judgment threshold, determining that the target smooth output control strategy is to adjust the second power smooth output reference value of the subsequent timestamp down to the target down-adjustment value, and adjusting the charge and discharge target power of the electrochemical energy storage device at the target timestamp to the maximum discharge power of each electrochemical energy storage device in this time period; or, In response to the power deviation being less than the first judgment threshold, the target smooth output control strategy is determined to increase the second power smooth output reference value of the subsequent timestamp to the target increase value, and the charging and discharging target power of the electrochemical energy storage device at the target timestamp is adjusted to the maximum charging power of each electrochemical energy storage device in this time period.

4. The method according to claim 3, characterized in that Determining the target downward adjustment value includes: Obtaining a smooth output reference power conversion basic coefficient, and comparing the charge state value of the electrochemical energy storage device with a first state judgment threshold; Determining a target down-regulation coefficient of the electrochemical energy storage device at the target timestamp based on the comparison result and the smoothed output reference power conversion basic coefficient; The target downward adjustment value is calculated based on the first power smoothing output reference value and the target downward adjustment coefficient.

5. The method according to claim 4, characterized in that The calculating the target downward adjustment value based on the first power smoothing output reference value and the target downward adjustment coefficient includes: Calculate the time difference between the target timestamp and the subsequent timestamp; The target downward adjustment coefficient is multiplied by the time difference, and the first power smoothing output reference value is subtracted from the product to calculate and obtain the target downward adjustment value.

6. The method according to claim 3, characterized in that Determining the target upward adjustment value includes: Obtaining a smooth output reference power conversion basic coefficient, and comparing the charge state value of the electrochemical energy storage device with a second state judgment threshold; Determining a target upward adjustment coefficient of the electrochemical energy storage device at the target timestamp based on the comparison result and the smoothed output reference power conversion basic coefficient; The target upward adjustment value is calculated based on the first power smoothing output reference value and the target upward adjustment coefficient.

7. The method according to claim 6, characterized in that The calculating the target upward adjustment value based on the first power smoothing output reference value and the target upward adjustment coefficient includes: Calculate the time difference between the target timestamp and the subsequent timestamp; The target upward adjustment coefficient is multiplied by the time difference, and the first power smoothing output reference value is added to the product to calculate and obtain the target upward adjustment value.

8. A wind farm electrochemical energy storage device control device, characterized in that: include: An acquisition module, used to acquire the historical output power of the wind turbine set and the charge state values ​​of all electrochemical energy storage devices within a target time period before a target timestamp, and to acquire a judgment threshold, the actual output power at the target timestamp, and a first power smoothing output reference value; A determination module, configured to determine a charge and discharge limit coefficient of the electrochemical energy storage device based on the charge state value and the judgment threshold, and determine a power threshold of the wind turbine generator set at the target timestamp based on the charge and discharge limit coefficient; a calculation module, configured to determine a second power smoothing output reference value of the wind turbine generator system at a subsequent timestamp of the target timestamp based on the power threshold, the actual output power and the first power smoothing output reference value; A control module is used to perform smooth output control on the electrochemical energy storage device based on the second power smooth output reference value.

9. An electronic device, characterized in that: Including memory and processor; The processor runs a program corresponding to the executable program code by reading the executable program code stored in the memory, so as to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 7 when executed by a processor.

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