Method and device for controlling electrochemical energy storage devices in a wind farm

Abstract

The present disclosure provides a wind farm electrochemical energy storage device control method and device, comprising: obtaining historical output power, state of charge value of the electrochemical energy storage device, judgment threshold value, actual output power at target timestamp and first power smoothing output reference value; determining the charge and discharge limiting coefficient based on the state of charge value and the judgment threshold value, and determining the power threshold value; determining the second power smoothing output reference value based on the power threshold value, the actual output power and the first power smoothing output reference value; and performing smoothing output control based on the second power smoothing output reference value. The method of the present disclosure can greatly improve the smoothness of wind power output, reduce the harmonic content, make it closer to conventional energy, enable wind power to better participate in the scheduling arrangement of the power grid, improve the competitiveness of the wind farm in the power market, promote large-scale grid connection and consumption of wind power, improve the management and control effect of the wind farm and the robustness of the system, and can reduce the management and control cost and improve the equipment life.

Description

TECHNICAL FIELD

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

[0002] With the increasing demand for clean energy worldwide, wind power, as a green and renewable energy, is gradually becoming an important part of the energy structure. Unlike conventional energy sources (such as thermal power and hydropower), due to the randomness, volatility and intermittency of wind energy, wind power output is unstable, and with large-scale wind power grid connection, it will 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) Reasonably planning the position and spacing of wind turbines in the wind farm can reduce the influence of wake effect and make the overall output power of the wind farm more stable; (2) Using advanced wind turbine control strategies, such as variable speed-variable pitch control, can automatically adjust the operating state of the wind turbine according to the real-time changes of wind speed, making the wind turbine output power more stable; (3) Combining wind power with other energy sources (such as solar energy, hydropower, etc.) to form a complementary power generation system, so that the overall system power output is more stable. However, no matter which method is used, there will still be some volatility in wind power output. SUMMARY

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

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

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

[0007] A third object 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 object, the first aspect of the present disclosure provides a wind farm electrochemical energy storage device control method, comprising: obtaining historical output power of a wind turbine in a target time period before a target timestamp and state of charge values of all electrochemical energy storage devices, and obtaining a judgment threshold, actual output power at the target timestamp, and a first power smoothing output reference value; determining a charge-discharge limit coefficient of the electrochemical energy storage devices based on the state of charge values and the judgment threshold, and determining a power threshold of the wind turbine at the target timestamp based on the charge-discharge limit coefficient; determining a second power smoothing output reference value of the wind turbine 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; performing smoothing output control on the electrochemical energy storage devices based on the second power smoothing output reference value; and determining the second power smoothing output reference value of the wind turbine at the subsequent timestamp of the target timestamp based on the power threshold, the actual output power, and the first power smoothing output reference value, comprising: subtracting the actual output power from the first power smoothing output reference value to obtain a power deviation; comparing the power deviation with the judgment threshold; determining a target smoothing output control strategy from candidate smoothing output control strategies of the electrochemical energy storage devices based on a comparison result, and determining the second power smoothing output reference value based on the target smoothing output control strategy.

[0011] According to one embodiment of the present disclosure, the power threshold comprises a first power threshold and a second power threshold, and determining the target smoothing output control strategy from the candidate smoothing output control strategies of the electrochemical energy storage devices based on the comparison result and determining the second power smoothing output reference value based on the target smoothing output control strategy, comprises: in response to the power deviation being greater than or equal to the first power threshold and less than or equal to the second power threshold, determining that the target smoothing output control strategy is that the second power smoothing output reference value at the subsequent timestamp is the same as the first power smoothing output reference value, and adjusting a charge-discharge target power of the electrochemical energy storage devices at the target timestamp to the power deviation value; or, in response to the power deviation being greater than the second power threshold, determining that the target smoothing output control strategy is that the second power smoothing output reference value at the subsequent timestamp is lowered to a target lowering value, and adjusting the charge-discharge target power of the electrochemical energy storage devices at the target timestamp to a maximum discharging power of each electrochemical energy storage device in the current period; or, in response to the power deviation being less than the first power threshold, determining that the target smoothing output control strategy is that the second power smoothing output reference value at the subsequent timestamp is raised to a target raising value, and adjusting the charge-discharge target power of the electrochemical energy storage devices at the target timestamp to a maximum charging power of each electrochemical energy storage device in the current period.

[0012] According to one of the embodiments of the present disclosure, the target down-regulation value is determined by: obtaining a smooth output reference power transformation base coefficient, and comparing the state of charge 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 smooth output reference power transformation base coefficient; and calculating the target down-regulation value based on the first power smooth output reference value and the target down-regulation coefficient.

[0013] According to one of the embodiments of the present disclosure, the target down-regulation value is calculated based on the first power smooth output reference value and the target down-regulation coefficient by: calculating a time difference value between the target timestamp and the subsequent timestamp; multiplying the target down-regulation coefficient by the time difference value, and subtracting the first power smooth output reference value from the product to obtain the target down-regulation value.

[0014] According to one of the embodiments of the present disclosure, the target up-regulation value is determined by: obtaining a smooth output reference power transformation base coefficient, and comparing the state of charge value of the electrochemical energy storage device with a second state judgment threshold; determining a target up-regulation coefficient of the electrochemical energy storage device at the target timestamp based on the comparison result and the smooth output reference power transformation base coefficient; and calculating the target up-regulation value based on the first power smooth output reference value and the target up-regulation coefficient.

[0015] According to one of the embodiments of the present disclosure, the target up-regulation value is calculated based on the first power smooth output reference value and the target up-regulation coefficient by: calculating a time difference value between the target timestamp and the subsequent timestamp; multiplying the target up-regulation coefficient by the time difference value, and adding the first power smooth output reference value to the product to obtain the target up-regulation value.

[0016] To achieve the above object, the second aspect of the present disclosure provides a wind farm electrochemical energy storage device control device, comprising: an acquisition module configured to acquire historical output power of a wind turbine in a target time period before a target timestamp and state of charge values of all electrochemical energy storage devices, and to acquire a judgment threshold, an actual output power at the target timestamp, and a first power smoothing output reference value; a determination module configured to determine a charge-discharge limitation coefficient of the electrochemical energy storage devices based on the state of charge values and the judgment threshold, and to determine a power threshold of the wind turbine at the target timestamp based on the charge-discharge limitation coefficient; a calculation module configured to determine a second power smoothing output reference value of the wind turbine 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; and a control module configured to perform smoothing output control on the electrochemical energy storage devices based on the second power smoothing output reference value; the calculation module is further configured to: subtract the actual output power from the first power smoothing output reference value to calculate a power deviation; compare the power deviation with the judgment threshold; determine a target smoothing output control strategy from candidate smoothing output control strategies of the electrochemical energy storage devices based on a comparison result, and determine the second power smoothing output reference value based on the target smoothing output control strategy.

[0017] To achieve the above object, the third aspect of the present disclosure provides 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 according to the first aspect of the present disclosure.

[0018] To achieve the above object, the fourth aspect of the present disclosure provides 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 according to the first aspect of the present disclosure.

[0019] To achieve the above object, the fifth aspect of the present disclosure provides a computer program product, comprising a computer program used to implement the wind farm electrochemical energy storage device control method according to the first aspect of the present disclosure when executed by a processor.

[0020] By integrating the historical output power data of the wind turbine through the method of the present disclosure, and designing and implementing the control strategy of the energy storage system, the smoothness of the wind power output can be greatly improved, the harmonic content can be reduced, and the wind power can be closer to the conventional energy, so that the wind power can better participate in the scheduling arrangement of the power grid, improve the competitiveness of the wind farm in the power market, promote the large-scale grid connection and consumption of wind power, improve the management and control effect of the wind farm and the robustness of the system, while reducing the management and control cost and prolonging the service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic diagram of a wind farm electrochemical energy storage device control method according to an embodiment of the present disclosure;

[0022] Figure 2 is a schematic diagram of a wind farm according to an embodiment of the present disclosure;

[0023] Figure 3 is a schematic diagram of another wind farm electrochemical energy storage device control method according to an embodiment of the present disclosure;

[0024] Figure 4 is a flowchart of determining a first target control strategy from candidate control strategies of an electrochemical energy storage device according to an embodiment of the present disclosure;

[0025] Figure 5 is a schematic diagram of stabilizing the DC bus voltage by current loop control according to an embodiment of the present disclosure;

[0026] Figure 6 is a schematic diagram of a calculation process of inputting the measured three-phase voltage of the power grid and outputting the frequency and phase angle of the power grid according to an embodiment of the present disclosure;

[0027] Figure 7 is a schematic diagram of a wind farm electrochemical energy storage device control device according to an embodiment of the present disclosure;

[0028] Figure 8 is a schematic diagram of an electronic device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0029] 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 represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present disclosure, and cannot be understood as a limitation of the present disclosure.

[0030] The acquisition, storage, use, processing, etc. of data in the technical solutions of the present disclosure comply with the relevant provisions of relevant laws and regulations.

[0031] It should be noted that in the embodiments of the present application, some software, components, models and other prior art solutions can be mentioned, which should be considered as exemplary, and the purpose is only to illustrate the feasibility of the technical solutions of the present application, but it does not mean that the applicant has or will necessarily use the solutions.

[0032] Figure 1 is a schematic diagram of a wind farm electrochemical energy storage device control method according to an embodiment of the present disclosure, as shown in Figure 1 , the wind farm electrochemical energy storage device control method comprises the following steps:

[0033] S101, obtaining the historical output power of the wind turbine in the target time period before the target timestamp and the state of charge value of all electrochemical energy storage devices, and obtaining the judgment threshold, the actual output power at the target timestamp and the first power smoothing output reference value.

[0034] The wind farm electrochemical energy storage device control method of the embodiments of the present application can be applied to the scene of wind farm automation control, and the execution subject of the wind farm electrochemical energy storage device control of the embodiments of the present application can be the wind farm electrochemical energy storage device control device of the embodiments of the present application. The wind farm electrochemical energy storage device control device can be set on an electronic device.

[0035] In the embodiments of the present disclosure, the wind farm can include multiple-state wind turbines, for example, as shown in Figure 2 , the wind farm has n power collection lines, each power collection line is arranged with m wind turbines, and the electrochemical energy storage device is connected to the low-voltage alternating current side of the wind turbine box at the end of each power collection line. The overall arrangement scheme of the power collection line and its energy storage device is shown in Figure 1 . The wind turbine mainly consists of 1-power generation system (including impeller, rotating chain and generator), 2-converter and 3-box transformer, 4-energy storage device mainly consists of battery system 4-1, inverter 4-2 and circuit breaker 4-3, etc. Each power collection line is connected to the 66kV AC bus of the booster station through the 6-circuit breaker, and then the voltage is raised to 220kV through the 8-boosting transformer and connected to the power grid.

[0036] It should be noted that the target time period is designed in advance and can be changed according to the actual design needs, which is not limited here. For example, it can be 10 minutes before the target timestamp, and it can also be 1 day before the target timestamp.

[0037] In the embodiments 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 the actual design needs, which is not limited here.

[0038] It should be noted that the electrochemical energy storage device can include a plurality of different operating states, and therefore the determination threshold can correspond to a plurality of values, which are determined according to actual conditions.

[0039] The power smoothing output reference value refers to a target output curve or threshold value set in wind power smoothing control, which is used to guide the wind turbine or wind farm to adjust its output power to achieve more stable and predictable power supply. This reference value can be set according to different requirements and conditions, and is usually optimized in combination with historical data, weather forecasts, and grid requirements.

[0040] In the embodiments of the present disclosure, the first power smoothing output reference value can be set in advance, or can be derived according to the operating state of the electrochemical energy storage device at the previous time stamp of the target time stamp. Here, no limitation is made.

[0041] In S102, the charge-discharge limiting coefficient of the electrochemical energy storage device is determined based on the state of charge value and the determination threshold, and the power threshold of the wind turbine at the target time stamp is determined based on the charge-discharge limiting coefficient.

[0042] It should be noted that the charge-discharge limiting coefficient is an important parameter for measuring the charging and discharging speed of the battery, which defines how long the battery can be fully charged or discharged. This coefficient has a direct impact on the performance, life, and safety of the electrochemical energy storage device.

[0043] The charge-discharge limiting coefficient of the electrochemical energy storage device is different under different operating states, and therefore in the embodiments of the present disclosure, the charge-discharge limiting coefficient of the electrochemical energy storage device is determined based on the state of charge value and the determination threshold after the state of charge value and the determination threshold are obtained. This can provide accurate limiting conditions for subsequent parameter value changes.

[0044] In S103, the second power smoothing output reference value of the wind turbine at the subsequent time stamp of the target time stamp is determined based on the power threshold, the actual output power, and the first power smoothing output reference value.

[0045] In the embodiments of the present disclosure, the method for determining the second power smoothing output reference value of the wind turbine at the subsequent time stamp of the target time stamp can be various, and no limitation is made herein.

[0046] In one possible implementation, the power threshold, the actual output power, and the first power smoothing output reference value can be calculated by a power smoothing output reference value algorithm to calculate the second power smoothing output reference value. It should be noted that the power smoothing output reference value algorithm is designed in advance and can be changed according to actual design needs, and no limitation is made herein.

[0047] In another possible implementation, the power threshold, actual output power, and first power smoothing output reference value can be processed by a power smoothing output reference value calculation model to generate a second power smoothing output reference value for the wind turbine at a subsequent timestamp of the target timestamp. This power smoothing output reference value calculation model is pre-trained and stored in the storage space of the electronic device for easy retrieval when needed.

[0048] S104, performs smooth output control of the electrochemical energy storage device based on the second power smooth output reference value.

[0049] In this embodiment, the historical output power of the wind turbine and the charge state values ​​of all electrochemical energy storage devices are first obtained within the target time period before the target time stamp. A judgment threshold, the actual output power at the target time stamp, and a first power smoothing output reference value are also obtained. Then, the charge and discharge limitation coefficient of the electrochemical energy storage device is determined based on the charge state value and the judgment threshold. The power threshold of the wind turbine at the target time stamp is determined based on the charge and discharge limitation coefficient. Then, 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 at a subsequent time stamp of the target time stamp is determined. Finally, the electrochemical energy storage device is subjected to smoothing output control based on the second power smoothing output reference value. Therefore, by integrating historical output power data of wind turbines through the method disclosed herein, and designing and implementing targeted control strategies for energy storage systems, the stability of wind power output can be significantly improved, harmonic content reduced, and wind power made closer to conventional energy sources. This enables wind power to better participate in grid dispatching, enhances the competitiveness of wind farms in the electricity market, promotes large-scale grid connection and consumption of wind power, improves the control and management effectiveness of wind farms and the robustness of the system, and reduces control and management costs while extending equipment lifespan.

[0050] In the embodiments of this disclosure, according to each electrochemical energy storage device Determine the charge / discharge limiting factor For example, it can be shown in the following formula:

[0051]

[0052] in, Let be the discharge coefficient of the electrochemical energy storage device, when The discharge coefficient is used when the time is positive; The charging coefficient of the electrochemical energy storage device, when The charging coefficient is used when the value is negative. It should be noted that a, b, c, and d in the formula are judgment thresholds of the electric quantity designed in advance, e is a constant function, a, b, c, d, and e can be changed according to actual design needs, and no limitation is made herein. For example, a, b, c, d, and e can be respectively 0.1, 0.2, 0.8, 0.9, and 10.

[0053] According to each super capacitor energy storage device Determine the charge and discharge limit coefficient , which can be shown as follows:

[0054]

[0055] wherein, is a discharge coefficient of the super capacitor energy storage device when the value is positive. The discharge coefficient is used when the value is positive. is a charging coefficient of the super capacitor energy storage device when the value is negative. The charging coefficient is used when the value is negative. It should be noted that f, g, h, and i in the formula are judgment thresholds of the electric quantity designed in advance, j is a constant function, f, g, h, i, and j can be changed according to actual design needs, and no limitation is made herein. For example, f, g, h, i, and j can be respectively 0.1, 0.2, 0.8, 0.9, and 10.

[0056] In the above embodiment, the second power smoothing output reference value of the wind turbine at the subsequent time stamp of the target time stamp is determined based on the power threshold, the actual output power, and the first power smoothing output reference value, and the second power smoothing output reference value can also be determined by Figure 3 Further explanation, the method comprises:

[0057] S301, the actual output power and the first power smoothing output reference value are subtracted to calculate and obtain the power deviation.

[0058] S302, the power deviation is compared with the power threshold.

[0059] S303, a target smoothing output control strategy is determined from the candidate smoothing output control strategies of the electrochemical energy storage device based on the comparison result, and a second power smoothing output reference value is determined based on the target smoothing output control strategy.

[0060] In the embodiments of the present disclosure, as Figure 4As shown, the power threshold includes a first power threshold and a second power threshold, a target smoothing output control strategy is determined from the candidate smoothing output control strategies of the electrochemical energy storage device based on the comparison result, and a second power smoothing output reference value is determined based on the target smoothing output control strategy. In response to the power deviation being greater than or equal to the first power threshold and less than or equal to the second power threshold, the target smoothing output control strategy is determined to be the second power smoothing output reference value at the subsequent time stamp being the same as the first power smoothing output reference value, and the charge and discharge target power of the electrochemical energy storage device at the target time stamp is adjusted to the power deviation value. Or in response to the power deviation being greater than the second power threshold, the target smoothing output control strategy is determined to be the second power smoothing output reference value at the subsequent time stamp being adjusted to a target adjustment value, and the charge and discharge target power of the electrochemical energy storage device at the target time stamp is adjusted to the maximum discharge power of each electrochemical energy storage device in the current period. Or in response to the power deviation being less than the first power threshold, the target smoothing output control strategy is determined to be the second power smoothing output reference value at the subsequent time stamp being adjusted to a target adjustment value, and the charge and discharge target power of the electrochemical energy storage device at the target time stamp is adjusted to the maximum charge power of each electrochemical energy storage device in the current period.

[0061] It should be noted that the first power threshold and the second power threshold are critical values for judging the current state of the electrochemical energy storage device. The first power threshold and the second power threshold are designed in advance and can be changed according to actual design needs, which are not limited here.

[0062] In the embodiments of the present disclosure, the first power threshold is the maximum discharge power of the electrochemical energy storage device, and the second power threshold is the maximum charge power of the electrochemical energy storage device.

[0063] In the embodiments of the present disclosure, the formula for calculating the first power threshold and the second power threshold is:

[0064]

[0065] Wherein, is the maximum discharge power of the electrochemical energy storage device i in the j time period, is the maximum charge power of the electrochemical energy storage device i in the j time period.

[0066] The formula for calculating the power deviation is:

[0067]

[0068] Wherein, is the j is the first power smoothing output reference value of the i-th electrochemical energy storage device in the j time period, i is the second power smoothing output reference value of the i-th electrochemical energy storage device in the j time period, is the j is the first power smoothing output reference value of the i-th electrochemical energy storage device in the j time period,i The actual power output of each collector wire is measured. Based on the deviation value, the power smoothing reference value and energy storage charging and discharging of each collector wire are controlled in three states.

[0069] In one possible implementation, taking the first 10 minutes of the target time period as an example, the average output power of each collector over the first 10 minutes can be calculated first and used as the initial reference value for smoothing the power output of each collector, as follows:

[0070]

[0071] Let the first control time period be j. This is the reference value for the smooth power output of the i-th collector line during the j-th time period; Let be the average output power of the i-th collector wire during the jm time interval, where each time interval corresponds to 1 minute.

[0072] In this embodiment of the disclosure, it can be based on The power smoothing output reference value and electrochemical energy storage charging and discharging of each wind turbine are controlled in three states.

[0073] when At that time, the power smoothing output reference value remains unchanged in the next control period, that is

[0074]

[0075] The target charging and discharging power of each energy storage device during this control period is the power deviation value, i.e.

[0076]

[0077] when At that time, based on the SOC of each electrochemical energy storage B,i (j) Calculate its target downward adjustment factor.

[0078] In this embodiment of the disclosure, the target reduction value is calculated based on the first power smoothing output reference value and the target reduction coefficient. First, the time difference between the target timestamp and the subsequent timestamp can be calculated. 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.

[0079] In this embodiment of the disclosure, determining the target reduction value can be achieved by first obtaining the smooth output reference power conversion base coefficient, comparing the charge state value of the electrochemical energy storage device with the first state judgment threshold, then determining the target reduction coefficient of the electrochemical energy storage device at the target timestamp based on the comparison result and the smooth output reference power conversion base coefficient, and finally calculating the target reduction value based on the first power smooth output reference value and the target reduction coefficient.

[0080] In the embodiments of the present disclosure, the formula for determining the target down-regulation coefficient is:

[0081]

[0082] wherein, is the target down-regulation coefficient of the i th wind turbine generator in the time period to which the j th moment belongs, is a constant function, is the power judgment threshold, k 0 is the smoothing output reference power transformation base coefficient, is the state of charge value of the electrochemical energy storage device of the i th wind turbine generator.

[0083] It should be noted that the constant function is designed in advance and can be set according to actual control needs, which is not limited here. For example, the constant function can take a value of 50, and when the SOC is equal to 0.1, the power smoothing rate is increased by 5 times. In this way, the value of the constant function can be controlled to control the rate of regulating power change, thereby meeting different control needs.

[0084] After obtaining the target down-regulation coefficient, the target down-regulation value is calculated based on the first power smoothing output reference value and the target down-regulation coefficient. The time difference between the target timestamp and the subsequent timestamp can be calculated first, then the target down-regulation coefficient is multiplied by the time difference, and the first power smoothing output reference value is subtracted from the product to obtain the target down-regulation value.

[0085] The target down-regulation value of the subsequent timestamp is calculated by the following formula:

[0086]

[0087] wherein, is the control period step. The charge and discharge target power of each electrochemical energy storage device in the control period is the maximum discharge power of each electrochemical energy storage device in the period, which is as follows:

[0088]

[0089] When , the target up-regulation value is determined. The smoothing output reference power transformation base coefficient can be obtained first, and then the state of charge value of the electrochemical energy storage device is compared with the second state judgment threshold. Then, based on the comparison result and the smoothing output reference power transformation base coefficient, the target up-regulation coefficient of the electrochemical energy storage device at the target timestamp is determined. Finally, the target up-regulation value is calculated based on the first power smoothing output reference value and the target up-regulation coefficient.

[0090] According to the SOC of each electrochemical energy storageB,i (j) calculating a target up-regulation coefficient thereof, a formula for determining the target up-regulation coefficient being:

[0091]

[0092] wherein, is a target up-regulation coefficient of the i th wind turbine generator in a time period to which the j th moment belongs, is a constant function, is an electricity amount judgment threshold value, k 0 is a smoothing output reference power transformation base coefficient, is a state of charge value of the electrochemical energy storage device of the i th wind turbine generator.

[0093] After the target up-regulation coefficient is obtained, a target up-regulation value is calculated based on the first power smoothing output reference value and the target up-regulation coefficient. The target up-regulation value can be calculated by first calculating a time difference value between the target time stamp and the subsequent time stamp, then multiplying the target up-regulation coefficient by the time difference value, and adding the first power smoothing output reference value to the product.

[0094] The target up-regulation value of the subsequent time stamp can be calculated by the following formula:

[0095]

[0096] The charge and discharge target power of each electrochemical energy storage device in the control period is the maximum charging power of each electrochemical energy storage device in the period, which is as follows:

[0097]

[0098] In an embodiment of the present disclosure, each energy storage device uses a grid-following control strategy to track the target power , see 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.

[0099] The input of the phase-locked loop phase angle calculation module 5 is the measured three-phase voltage of the grid, and the output is the grid frequency and phase angle. The calculation process is shown in Figure 6 . First, set the initial phase to θ , and substitute it into the dq coordinate conversion to calculate the grid voltage u od and u oq value, the formula is as follows:

[0100]

[0101]

[0102] u ​oq Substitute the PI formula, calculate the grid frequency, the formula is as follows:

[0103]

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

[0105] If

[0106] u oq Not close to 0, the calculated phase angle is substituted into formula (13)~(16) to recalculate the grid frequency and phase angle until u oq Close to 0, lock 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 module input is grid measured three-phase voltage u oabc , energy storage output three-phase current i abc , active reference value ( j ), reactive reference value ( j ), output is energy storage PCC point dq axis current control target value i dq * First, through dq coordinate conversion, the grid measured three-phase voltage u oabc , three-phase current i abc is converted to u odq and i dq , then substitute the following formula to calculate the grid measured active and reactive .

[0108]

[0109] Then substitute , , ( j ) and ( j ) into the PI formula to calculate the energy storage PCC point dq axis current control target value i dq * , the formula is as follows:

[0110] ​

[0111] The current inner loop calculation module 7 includes PI calculation 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 Convert to dq-axis current by dq transformation i dq Then, the corresponding voltage value of the current loop is calculated by PI calculation, and the formula is as follows:

[0112]

[0113] Then, 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 * is substituted into the dq coordinate inverse transformation to calculate the inverter modulation voltage control target value u abc * , and the formula is as follows:

[0116]

[0117]

[0118] Corresponding to the wind farm electrochemical energy storage device control method provided by the above several embodiments, one embodiment of the present disclosure also provides a wind farm electrochemical energy storage device control device. Since the wind farm electrochemical energy storage device control device provided by the embodiment of the present disclosure corresponds to the wind farm electrochemical energy storage device control method provided by the above several embodiments, the implementation manner of the above wind farm electrochemical energy storage device control method is also applicable to the wind farm electrochemical energy storage device control device provided by the embodiment of the present disclosure, which will not be described in detail in the following embodiments.

[0119] Figure 7 is a schematic diagram of a wind farm electrochemical energy storage device control device according to an embodiment of the present disclosure, as Figure 7 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.

[0120] The acquisition module 710 is configured to acquire a historical output power of the wind turbine within a target time period before a target timestamp and a state of charge value of all the electrochemical energy storage devices, and acquire a judgment threshold, an actual output power at the target timestamp, and a first power smooth output reference value.

[0121] The determination module 720 is configured to determine a charge-discharge limitation coefficient of the electrochemical energy storage device based on the state of charge value and the judgment threshold, and determine a power threshold of the wind turbine at the target timestamp based on the charge-discharge limitation coefficient.

[0122] The calculation module 730 is configured to determine a second power smooth output reference value of the wind turbine 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.

[0123] The control module 740 is configured to perform smooth output control on the electrochemical energy storage device based on the second power smooth output reference value.

[0124] According to one embodiment of the present disclosure, the determination of the second power smooth output reference value of the wind turbine at the subsequent timestamp of the target timestamp based on the power threshold, the actual output power, and the first power smooth output reference value comprises: subtracting the actual output power from the first power smooth output reference value to calculate a power deviation; comparing the power deviation with the power threshold; determining a target smooth output control strategy from candidate smooth output control strategies of the electrochemical energy storage device based on a comparison result, and determining the second power smooth output reference value based on the target smooth output control strategy.

[0125] According to one embodiment of the present disclosure, the power threshold comprises a first power threshold and a second power threshold, the target smoothing output control strategy is determined from the candidate smoothing output control strategies of the electrochemical energy storage device based on the comparison result, and the second power smoothing output reference value is determined based on the target smoothing output control strategy, comprising: in response to the power deviation being greater than or equal to the first power threshold and less than or equal to the second power threshold, determining that the target smoothing output control strategy is that the second power smoothing output reference value at the subsequent time stamp is the same as the first power smoothing output reference value, and adjusting the charge and discharge target power of the electrochemical energy storage device at the target time stamp to the power deviation value; or, in response to the power deviation being greater than the second power threshold, determining that the target smoothing output control strategy is that the second power smoothing output reference value at the subsequent time stamp is lowered to a target lowering value, and adjusting the charge and discharge target power of the electrochemical energy storage device at the target time stamp to the maximum discharge power of each electrochemical energy storage device in the current period; or, in response to the power deviation being less than the first power threshold, determining that the target smoothing output control strategy is that the second power smoothing output reference value at the subsequent time stamp is raised to a target raising value, and adjusting the charge and discharge target power of the electrochemical energy storage device at the target time stamp to the maximum charge power of each electrochemical energy storage device in the current period.

[0126] According to one embodiment of the present disclosure, the target lowering value is determined, comprising: obtaining a smoothing output reference power transformation base coefficient, and comparing the state of charge value of the electrochemical energy storage device with a first state judgment threshold; determining a target lowering coefficient of the electrochemical energy storage device at the target time stamp based on the comparison result and the smoothing output reference power transformation base coefficient; and calculating the target lowering value based on the first power smoothing output reference value and the target lowering coefficient.

[0127] According to one embodiment of the present disclosure, the target lowering value is calculated based on the first power smoothing output reference value and the target lowering coefficient, comprising: calculating a time difference value between the target time stamp and the subsequent time stamp; multiplying the target lowering coefficient by the time difference value, and subtracting the product from the first power smoothing output reference value to calculate the target lowering value.

[0128] According to one embodiment of the present disclosure, the target raising value is determined, comprising: obtaining a smoothing output reference power transformation base coefficient, and comparing the state of charge value of the electrochemical energy storage device with a second state judgment threshold; determining a target raising coefficient of the electrochemical energy storage device at the target time stamp based on the comparison result and the smoothing output reference power transformation base coefficient; and calculating the target raising value based on the first power smoothing output reference value and the target raising coefficient.

[0129] According to one embodiment of the present disclosure, the target up-regulation value is calculated based on the first power-smoothed output reference value and the target up-regulation coefficient, including: calculating a time difference value of the target timestamp and the subsequent timestamp; multiplying the target up-regulation coefficient by the time difference value, and adding the first power-smoothed output reference value to the product to obtain the target up-regulation value.

[0130] Therefore, by integrating the historical output power data of the wind turbine through the method of the present disclosure, and designing and implementing the control strategy of the energy storage system, the stability of the wind power output can be greatly improved, the harmonic content can be reduced, and the wind power output is closer to the conventional energy, so that the wind power can better participate in the scheduling arrangement of the power grid, improve the competitiveness of the wind farm in the power market, promote the large-scale grid connection and consumption of wind power, improve the management and control effect of the wind farm and the robustness of the system, while reducing the management and control cost and prolonging the service life of the equipment.

[0131] To achieve the above-mentioned embodiments, the present disclosure further provides an electronic device 800, Figure 8 is a schematic diagram of an electronic device according to one embodiment of the present disclosure, as Figure 8 shown, the electronic device 800 includes a processor 801 and a memory 802 in communication with the processor, the memory 802 stores instructions executable by at least one processor, and the instructions are executed by at least one processor 801 to implement the wind farm electrochemical energy storage device control method according to the present disclosure Figures 1-6 embodiments.

[0132] To achieve the above-mentioned embodiments, the present disclosure further provides a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to make a computer implement the wind farm electrochemical energy storage device control method according to the present disclosure Figures 1-6 embodiments.

[0133] To achieve the above-mentioned embodiments, the present disclosure further provides a computer program product, including a computer program, the computer program is executed by a processor to implement the wind farm electrochemical energy storage device control method according to the present disclosure Figures 1-6 embodiments.

[0134] 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 these legitimate uses. In addition, such collection / sharing should be carried out after the user's informed consent is received, including but not limited to informing the user to read the user agreement / user notice before the user uses the function, and signing the agreement / authorization including authorization of relevant user information. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data, and to ensure that other people with access to personal information data comply with their privacy policies and processes.

[0135] The present application contemplates an implementation that provides users with the ability to selectively opt in or opt out of permitting the collection and / or use of their personal information data. That is, the present disclosure contemplates providing users with the ability to prevent or limit the collection and / or use of their personal information data. For example, the present disclosure contemplates providing users with the ability to prevent or limit the collection and / or use of their personal information data by, for example, blocking or deleting cookies. In addition, the present disclosure contemplates providing users with the ability to determine whether and how to interact with the present disclosure by, for example, blocking web beacons. Further, the present disclosure contemplates providing users with the ability to access and / or edit their personal information data when such data is collected by the present disclosure. In addition, the present disclosure contemplates that the collection and / or use of personal information data can be limited to only those users who expressly consent or give permission to the collection and / or use of their personal information data.

[0136] In the foregoing detailed description, reference is made to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. which describe a particular feature, structure, material, or characteristic included in at least one embodiment or example of the application. The illustrative examples described in this specification are not necessarily to be construed as being limitations on the scope or functionality of the application, because the example embodiments can be otherwise modified or implemented, or other embodiments can be implemented that are not specifically described. Thus, although the fore going detailed description contains specific implementation details, these should not be construed as limiting the scope of the application but merely as describing illustrative examples. It will be readily apparent to one skilled in the art that varying substitutions and modifications can be made to the embodiments disclosed herein without departing from the scope and spirit of the application. For example, features described in one embodiment can be incorporated into another embodiment. Furthermore, the described embodiments are to be considered in a descriptive sense only and not for purposes of limitation. Therefore, the scope of the application is indicated not by the foregoing detailed description, but instead by the appended claims, although claims can be drafted to include features described in the foregoing detailed description.

[0137] In addition, the terms "first", "second", etc., are used herein only to describe various features and do not imply a relative importance or a specific order of the features. Thus, a feature defined with "first" can implicitly or explicitly include at least one of the feature defined with "second". The meaning of "a", "an", and "the" included in the context of the present application are limited to referring to one or more of the things to which they refer rather than to one and only one unless expressly so defined. The term "plurality" is defined as including at least two, for example, two, three, four, etc.

[0138] Any processes or methods described in the flow charts or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing specific logic functions (or steps) of the processes. It will be readily apparent to those skilled in the art that alternative implementations of the preferred embodiments of the present application can be made without departing from the scope and spirit of the application. Accordingly, the scope of the present application is not intended to be limited to the particular implementations described above.

[0139] The logic and / or steps represented in the flowcharts and / or described herein, for example, can be considered as a sequence of executable instructions stored in a computer readable medium, which can be executed by an instruction execution system, apparatus or device, such as a computer-based system, processor- based system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions, or a combination thereof. For the purposes of this specification, a "computer readable medium" can be any apparatus that contains, stores, communicates, propagates, or transports the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer readable medium include the following: an electrical connection (electronic) having one or more wires, a portable computer diskette (magnetic), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium can even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example, by optically scanning the paper or other suitable medium, then electronically converted into a form that is comprehensible by a computer, and then stored in computer memory.

[0140] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, the various steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As such, if implemented in hardware and in another embodiment, any of the following technologies, or combinations thereof, can be used: discrete logic circuitry having logic gates for implementing logic functions upon data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and so forth.

[0141] Those of skill in the art could readily implement the above described example methods with all or a portion of the disclosed steps carried out by a program for use with a computer system or similar electronic apparatus, or carried out by such a system or apparatus itself. The aforementioned methods can be written as one or more computer programs (for use with different operating systems or platforms) to implement the disclosed example methods.

[0142] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing module, or each of the units can be physically present separately, or two or more units can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0143] The storage medium mentioned above can 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 should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to 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: The historical output power of the wind turbine and the charge state values ​​of all electrochemical energy storage devices within the target time period before the target time stamp are obtained, and the judgment threshold, the actual output power at the target time stamp, and the first power smoothing output reference value are obtained. The charge and discharge limitation 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 at the target time stamp is determined based on the charge and discharge limitation coefficient. 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 at a time after the target time stamp is determined. The electrochemical energy storage device is subjected to smooth output control based on the second power smooth output reference value; The step of determining the second power smoothing output reference value of the wind turbine at a subsequent time point of the target time point, based on the power threshold, the actual output power, and the first power smoothing output reference value, includes: The actual output power is subtracted from the first power smoothed output reference value to calculate the power deviation; Compare the power deviation with the power threshold; Based on the comparison results, a target smooth output control strategy is determined from the candidate smooth output control strategies of the electrochemical energy storage device, and a second power smooth output reference value is determined based on the target smooth output control strategy.

2. The method according to claim 1, characterized in that, The power threshold includes a first power threshold and a second power threshold. 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 results, 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 power threshold and less than or equal to the second power threshold, the target smooth output control strategy is determined to be that the second power smooth output reference value at the subsequent timestamp is the same as the first power smooth output reference value, and the charge / 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 exceeding the second power threshold, the target smoothing output control strategy is determined to lower the second power smoothing output reference value at subsequent timestamps to the target lowering value, and to adjust the charge / 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 power threshold, the target smooth output control strategy is determined to be to raise the second power smooth output reference value of the subsequent timestamp to the target upward value, and to adjust the charging and discharging 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.

3. The method according to claim 2, characterized in that, Determining the target downward adjustment value includes: Obtain the basic coefficients of the smooth output reference power conversion, and compare the charge state value of the electrochemical energy storage device with the first state judgment threshold; Based on the comparison results and the smooth output reference power conversion base coefficient, the target down-adjustment coefficient of the electrochemical energy storage device at the target timestamp is determined. The target reduction value is calculated based on the first power smoothing output reference value and the target reduction coefficient.

4. The method according to claim 3, characterized in that, The calculation of the target reduction value based on the first power smoothing output reference value and the target reduction coefficient includes: Calculate the time difference between the target timestamp and the subsequent timestamp; The target reduction factor 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.

5. The method according to claim 2, characterized in that, Determining the target upward adjustment value includes: Obtain the smooth output reference power conversion base coefficient and compare the charge state value of the electrochemical energy storage device with the second state judgment threshold; Based on the comparison results and the smooth output reference power conversion base coefficient, the target up-adjustment coefficient of the electrochemical energy storage device at the target timestamp is determined. The target upward adjustment value is calculated based on the first power smoothing output reference value and the target upward adjustment coefficient.

6. The method according to claim 5, characterized in that, The calculation of 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 factor is multiplied by the time difference, and the first power smoothing output reference value is added to the product to calculate the target upward adjustment value.

7. A control device for an electrochemical energy storage device in a wind farm, characterized in that, include: The acquisition module is used to acquire the historical output power of the wind turbine and the charge state values ​​of all electrochemical energy storage devices within the target time period before the target time stamp, and to acquire the judgment threshold, the actual output power at the target time stamp, and the first power smoothing output reference value. The determination module is used to determine the charge and discharge limitation coefficient of the electrochemical energy storage device based on the charge state value and the judgment threshold, and to determine the power threshold of the wind turbine at the target time stamp based on the charge and discharge limitation coefficient. The calculation module is used to determine the second power smoothing output reference value of the wind turbine at a time after the target time stamp based on the power threshold, the actual output power and the first power smoothing output reference value; The control module is used to perform smooth output control on the electrochemical energy storage device based on the second power smooth output reference value; The computing module is also used for: The actual output power is subtracted from the first power smoothed output reference value to calculate the power deviation; Compare the power deviation with the power threshold; Based on the comparison results, a target smooth output control strategy is determined from the candidate smooth output control strategies of the electrochemical energy storage device, and a second power smooth output reference value is determined based on the target smooth output control strategy.

8. An electronic device, characterized in that, Including memory and processor; The processor reads executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement the method as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-6.

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