Wind storage fusion control method, device and equipment and storage medium

Abstract

The invention provides a wind storage fusion control method and device, equipment and a storage medium, and the method comprises the steps: obtaining a first output power reference value of each current collection line, the actual output power corresponding to each current collection line, and an SOC value of each energy storage device in a current control period; based on the SOC value of each energy storage device, obtaining the maximum charging power and the maximum discharging power of each energy storage device; based on a power difference value between the first output power reference value and the actual output power, the maximum charging power and the maximum discharging power, obtaining charging and discharging target power of each energy storage device; acquiring a charging modulation voltage or a discharging modulation voltage of the energy storage device; and controlling the energy storage device based on the charging and discharging target power and the charging modulation voltage or the charging modulation voltage of the energy storage device. According to the scheme, the output stability of the wind power plant can be improved.

Description

Technical Field

[0001] The present application relates to the field of wind power generation and energy storage technology, and in particular to a wind-storage fusion control method, device, equipment and storage medium. Background Art

[0002] Due to the randomness, volatility and intermittency of wind energy, the output power of wind power generation is prone to fluctuations. With the large-scale connection of wind power to the grid, the volatility of wind power generation will bring challenges to the scheduling 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 state 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 application aims to solve one of the technical problems in the related art at least to some extent.

[0005] In the first aspect, an object of the present disclosure is to propose a wind-storage fusion control method for smoothing wind power output power, wherein the wind farm comprises at least one collector line, each of which is provided with an electrochemical energy storage device and a supercapacitor energy storage device, and the method comprises: obtaining a first output power reference value of each of the collector lines in the current control period, an actual output power corresponding to each of the collector lines, and an SOC value of each of the energy storage devices; based on the SOC value of each of the energy storage devices, obtaining a maximum charging power and a maximum discharging power of each of the energy storage devices; based on the power difference between the first output power reference value and the actual output power, the maximum charging power and the maximum discharging power, obtaining a charging and discharging target power of each of the energy storage devices; obtaining a charging modulation voltage or a discharging modulation voltage of the energy storage device; based on the charging and discharging target power, the charging modulation voltage of the energy storage device, or the charging modulation voltage, controlling the charging and discharging of the energy storage device, and controlling the wind turbine corresponding to the collector line according to the optimal power operation mode.

[0006] In one implementation, the obtaining of the maximum charging power and the maximum discharging power of each of the energy storage devices based on the SOC value of each of the energy storage devices includes: obtaining the rated charging and discharging power of each of the energy storage devices; obtaining the charging coefficient and the discharging coefficient of each of the energy storage devices based on the SOC value of each of the energy storage devices; obtaining the maximum charging power of each of the energy storage devices based on the rated charging and discharging power and the charging coefficient of each of the energy storage devices, and obtaining the maximum discharging power of each of the energy storage devices based on the rated charging and discharging power and the discharging coefficient of each of the energy storage devices.

[0007] In one implementation, the acquiring of the target charge and discharge power of each of the energy storage devices based on the power difference between the first output power reference value and the actual output power, the maximum charging power, and the maximum discharging power includes: acquiring a historical power deviation value and a historical charge and discharge power target value corresponding to a previous historical control period adjacent to the current control period; performing low-pass filtering on the power difference based on the historical power deviation value and the historical charge and discharge power target value to acquire a low-frequency component value and a high-frequency component value; using the low-frequency component value as the partial power difference corresponding to the electrochemical energy storage device, and using the high-frequency component value as the partial power difference corresponding to the supercapacitor energy storage device; acquiring the charge and discharge target power of each of the energy storage devices based on the partial power difference, the maximum charging power, and the maximum discharging power corresponding to each of the energy storage devices.

[0008] In an optional implementation, the acquiring the charging and discharging target power of each energy storage device based on the partial power difference, the maximum charging power and the maximum discharging power corresponding to each energy storage device includes: in response to the partial power difference being less than the maximum charging power, using the maximum charging power as the charging and discharging target power of the energy storage device in the current control period; or, in response to the partial power difference being greater than or equal to the maximum discharging power and less than or equal to the maximum charging power, using the partial power difference as the charging and discharging target power of the energy storage device in the current control period; or, in response to the partial power difference being greater than the maximum discharging power, using the maximum discharging power as the charging and discharging target power of the energy storage device in the current control period.

[0009] In an optional implementation, the method further includes: in response to the partial power difference being less than the maximum charging power and the SOC value being less than or equal to a first threshold, based on a preset first coefficient, the control period duration and the first output power reference value, calculating and obtaining a second output power reference value for the next control period; or, in response to the partial power difference being less than the maximum charging power and the SOC value being greater than the first threshold, calculating and obtaining a second coefficient based on the difference between the SOC value and the first threshold and the first coefficient, and calculating and obtaining a second output power reference value for the next control period based on the second coefficient, the control period duration and the first output power reference value. output power reference value; or, in response to the partial power difference being greater than the maximum discharge power and the SOC value being less than a preset second threshold, a fourth coefficient is calculated based on the difference between the SOC value and the second threshold and a preset third coefficient, and a second output power reference value for a next control period is calculated based on the fourth coefficient, the control period duration and the first output power reference value; or, in response to the partial power difference being greater than the maximum discharge power and the SOC value being less than a preset second threshold, a second output power reference value for a next control period is calculated based on the third coefficient, the control period duration and the first output power reference value.

[0010] In one implementation, the method further includes: obtaining optimal control strategy parameters and inverter modulation voltage control target values; controlling the machine-side converters of each collector wind turbine converter based on the optimal control strategy parameters; and controlling the inverter based on the inverter modulation voltage control target value.

[0011] In the second aspect, the present application proposes a wind-storage fusion control device, wherein the wind farm includes at least one collector line, and each of the collector lines is provided with a hybrid energy storage device, and the device includes: a first acquisition module, used to obtain the first output power reference value of each of the collector lines in the current control period, the actual output power corresponding to each of the collector lines, and the SOC value of each of the energy storage devices; a first processing module, used to obtain the maximum charging power and the maximum discharging power of each of the energy storage devices based on the SOC value of each of the energy storage devices; a second processing module, used to obtain the charging and discharging target power of each of the energy storage devices based on the power difference between the first output power reference value and the actual output power, the maximum charging power and the maximum discharging power; a second acquisition module, used to obtain the charging modulation voltage or the discharging modulation voltage of the energy storage device; a third processing module, used to control the charging and discharging of the energy storage device based on the charging and discharging target power of each of the energy storage devices, the charging modulation voltage of each of the energy storage devices, or the charging modulation voltage, and control the wind turbine corresponding to the collector line according to the optimal power operation mode.

[0012] In one implementation, the first processing module can be used to: obtain the rated charge and discharge power of each of the energy storage devices; obtain the charging coefficient and the discharging coefficient of each of the energy storage devices based on the SOC value of each of the energy storage devices; obtain the maximum charging power of each of the energy storage devices based on the rated charge and discharge power and the charging coefficient of each of the energy storage devices, and obtain the maximum discharging power of each of the energy storage devices based on the rated charge and discharge power and the discharge coefficient of each of the energy storage devices.

[0013] In one implementation, the second processing module can be used to: obtain a historical power deviation value and a historical charge and discharge power target value corresponding to the previous historical control period adjacent to the current control period; based on the historical power deviation value and the historical charge and discharge power target value, perform low-pass filtering on the power difference to obtain a low-frequency component value and a high-frequency component value; use the low-frequency component value as the partial power difference corresponding to the electrochemical energy storage device, and use the high-frequency component value as the partial power difference corresponding to the supercapacitor energy storage device; based on the partial power difference, the maximum charging power and the maximum discharging power corresponding to each of the energy storage devices, obtain the charge and discharge target power of each of the energy storage devices.

[0014] In an optional implementation, the second processing module may be used to: in response to the partial power difference being less than the maximum charging power, use the maximum charging power as the charging and discharging target power of the energy storage device in the current control period; or, in response to the partial power difference being greater than or equal to the maximum discharging power and less than or equal to the maximum charging power, use the partial power difference as the charging and discharging target power of the energy storage device in the current control period; or, in response to the partial power difference being greater than the maximum discharging power, use the maximum discharging power as the charging and discharging target power of the energy storage device in the current control period.

[0015] In an optional implementation, the second processing module may also be used for: in response to the partial power difference being less than the maximum charging power and the SOC value being less than or equal to a first threshold, based on a preset first coefficient, the control period duration and the first output power reference value, calculating and obtaining a second output power reference value for the next control period; or, in response to the partial power difference being less than the maximum charging power and the SOC value being greater than the first threshold, calculating and obtaining a second coefficient based on the difference between the SOC value and the first threshold and the first coefficient, and calculating and obtaining a second output power reference value for the next control period based on the second coefficient, the control period duration and the first output power reference value. a second output power reference value; or, in response to the partial power difference being greater than the maximum discharge power and the SOC value being less than a preset second threshold, a fourth coefficient is calculated based on the difference between the SOC value and the second threshold and a preset third coefficient, and based on the fourth coefficient, the control period duration and the first output power reference value, the second output power reference value for the next control period is calculated and obtained; or, in response to the partial power difference being greater than the maximum discharge power and the SOC value being less than a preset second threshold, the second output power reference value for the next control period is calculated and obtained based on the third coefficient, the control period duration and the first output power reference value.

[0016] In one implementation, the device also includes a fourth processing module, which is used to: obtain optimal control strategy parameters and inverter modulation voltage control target value; control the machine-side converter of each collector wind turbine converter based on the optimal control strategy parameters; and control the inverter based on the inverter modulation voltage control target value.

[0017] In the third aspect, the present application 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 so that the at least one processor can execute the wind-storage fusion control method as described in the first aspect.

[0018] In a fourth aspect, the present application proposes a computer-readable storage medium for storing instructions, which, when executed, enables the method described in the first aspect to be implemented.

[0019] In a fifth aspect, the present application proposes a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of the wind-storage fusion control method as described in the first aspect.

[0020] The wind-storage fusion control method, device, equipment and storage medium provided in the present application can obtain the power difference corresponding to each collector line based on the output power reference value and actual output power corresponding to each collector line, and obtain the maximum charging power and maximum discharging power of the energy storage device based on the SOC value of the energy storage device in each collector line, so as to obtain the charging and discharging target power of each energy storage device based on the power difference between the first output power reference value and the actual output power, the maximum charging power and the maximum discharging power, so as to control the energy storage device by adopting the optimal power control strategy combined with the charging and discharging target power of each energy storage device. It can improve the safety and operation efficiency of the energy storage system in the wind farm.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0023] Figure 1 It is a flow chart of a wind-storage fusion control method provided in an embodiment of the present application;

[0024] Figure 2 It is a structural schematic diagram of a charge and discharge modulation voltage calculator provided in an embodiment of the present application;

[0025] Figure 3 It is a flow chart of another wind-storage fusion control method provided in an embodiment of the present application;

[0026] Figure 4 It is a schematic diagram of a general arrangement scheme of a collector and a hybrid energy storage device provided in an embodiment of the present application;

[0027] Figure 5 It is a flow chart of another wind-storage fusion control method provided in an embodiment of the present application;

[0028] Figure 6 is a schematic diagram of the structure of a power controller provided in an embodiment of the present application;

[0029] Figure 7 It is a structural schematic diagram of a wind turbine converter grid-side conversion controller provided in an embodiment of the present application;

[0030] Figure 8 is a schematic diagram of a phase-locked loop calculation process provided in an embodiment of the present application;

[0031] Fig. 9It is a flow chart of a control method of a collector DC side hybrid energy storage device for smoothing wind power output power provided in an embodiment of the present application;

[0032] Fig.10 It is a structural schematic diagram of a wind-storage fusion control device provided in an embodiment of the present application;

[0033] Fig.11 This is a schematic diagram of the structure of another wind-storage fusion control device provided in an embodiment of the present application.

[0034] Fig.12 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described in detail below, and examples of the embodiments 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 application, and should not be construed as limiting the present application.

[0036] The wind-storage fusion control method and device of an embodiment of the present application will be described below with reference to the accompanying drawings.

[0037] It should be noted that the wind farm includes at least one collector line, each collector line is provided with a hybrid energy storage device, and each hybrid energy storage device includes an electrochemical energy storage device and a supercapacitor energy storage device.

[0038] Figure 1 Schematic diagram of a flow chart of a wind-storage fusion control method provided in an embodiment of the present application. Figure 1 As shown, the method may include but is not limited to the following steps:

[0039] Step S101: obtaining a first output power reference value of each collector line, an actual output power corresponding to each collector line, and an SOC (state of charge) value of each energy storage device in a current control period.

[0040] Exemplarily, the average output power of each collector within a preset period of time (for example, 10 minutes) before the current control period is obtained as the first output power reference value of each collector in the current control period, and the actual output power of each collector in the wind farm at the current moment and the SOC value of each energy storage device at the current moment are obtained.

[0041] Step S102: Based on the SOC value of each energy storage device, the maximum charging power and the maximum discharging power of each energy storage device are obtained.

[0042] Exemplarily, based on the SOC value of each energy storage device, the maximum energy value that can be charged into or discharged in the current state of each energy storage device is determined, thereby obtaining the maximum charging power and the maximum discharging power of each energy storage device based on the maximum energy that can be charged into or discharged in the current state of each energy storage device and the rated power of each energy storage device.

[0043] Step S103: based on the power difference between the first output power reference value and the actual output power, the maximum charging power and the maximum discharging power, the charging and discharging target power of each energy storage device is obtained.

[0044] Exemplarily, based on the power difference between the first output power reference value corresponding to the collector A and the actual output power, the maximum charging power and the maximum discharging power of the energy storage device on the collector A, the charging and discharging target power of the energy storage device on the collector A is obtained, thereby obtaining the charging and discharging target power of each energy storage device. The collector A is any collector.

[0045] It should be noted that, in the embodiment of the present application, when calculating the above power difference, the first output power reference value may be used as the minuend and the actual output power may be used as the subtrahend to obtain the power difference. Specifically, it may be expressed as follows:

[0046]

[0047] In the formula, is the first output power reference value corresponding to the i-th collector line in the time period of time j, is the actual power corresponding to the i-th collector line in the time period to which time j belongs. If the power difference is a positive value, it means that the first output power reference value is greater than the actual power, and the energy storage device needs to be discharged, then the discharge target power of the energy storage device is obtained; if the power difference is a negative value, it means that the first output power reference value is less than the actual power, and the energy storage device needs to be charged, then the charging target power of the energy storage device is obtained, and i is a positive integer.

[0048] It should be noted that, in the embodiment of the present application, time j may be the current time.

[0049] Step S104: obtaining a charging modulation voltage or a discharging modulation voltage of the energy storage device.

[0050] In some embodiments, the charging modulation voltage may be obtained by the following steps:

[0051] A1: Obtain the charging reference power and actual charging current of the energy storage device.

[0052] A2: Calculate the charging reference current based on the charging reference power.

[0053] Exemplarily, the above calculation process can be expressed as follows:

[0054]

[0055] In the formula, is the charging reference current, U ESS is the charging reference voltage, is the charging reference power of the energy storage device on the i-th collector.

[0056] A3: Perform PI calculation based on the charging reference current and the actual charging current to obtain the charging modulation voltage.

[0057] Exemplarily, the above calculation process can be expressed as follows:

[0058]

[0059] in, is the charge modulation voltage, is the charging reference current, I L is the actual measured charging current.

[0060] In some embodiments, the discharge modulation voltage may be obtained by the following steps:

[0061] B1: Obtain the charging reference power and actual charging current of the energy storage device.

[0062] B2: Calculate the charging reference current based on the charging reference power.

[0063] Exemplarily, the above calculation process can be expressed as follows:

[0064]

[0065] In the formula, is the charging reference current, U ESS is the charging reference voltage, is the charging reference power of the energy storage device on the i-th collector.

[0066] B3: Perform PI calculation based on the charging reference current and the actual charging current to obtain the discharge modulation voltage.

[0067]

[0068] in, is the charge modulation voltage, is the charging reference current, I L It is the actual measured charging current.

[0069] As an example, see Figure 2 , Figure 2 Schematic diagram of a charge and discharge modulation voltage calculator provided in an embodiment of the present application. Figure 2 As shown, the device includes a charging control process 20 and a discharging control process 21. The charging control process 20 is mainly composed of S1 controlling the conversion switch 20-1, the charging modulation voltage PI calculation 20-2, and the charging reference current calculation 20-3. The discharging control process is mainly composed of S2 controlling the conversion switch 21-1, the discharge modulation voltage PI calculation 21-2, and the discharge reference current calculation 21-3. When the energy storage system is charging, S1 controls the conversion switch to switch to the charging controller, and S2 controls the conversion switch to switch to off. The DC-DC charges the energy storage battery or supercapacitor through the step-down conversion mode. When the energy storage system is discharging, S1 controls the conversion switch to switch to off, and S2 controls the conversion switch to switch to the discharge controller. The DC-DC discharges the energy storage battery or supercapacitor through the boost conversion mode.

[0070] Step S105: Based on the target charge and discharge power of the energy storage device and the charge modulation voltage or discharge modulation voltage of the energy storage device, the energy storage device is controlled to charge and discharge, and the wind turbine corresponding to the collector is controlled according to the optimal power operation model.

[0071] Exemplarily, each energy storage device is controlled based on the charging target power and the charging modulation voltage of each energy storage device.

[0072] Exemplarily, each energy storage device is controlled based on the discharge target power and the discharge modulation voltage of each energy storage device.

[0073] By implementing the embodiment of the present application, the power difference corresponding to each collector line can be obtained based on the output power reference value and actual output power corresponding to each collector line, and the maximum charging power and maximum discharging power of the energy storage device can be obtained based on the SOC value of the energy storage device in each collector line, so as to obtain the charging and discharging target power of each energy storage device based on the power difference between the first output power reference value and the actual output power, the maximum charging power and the maximum discharging power, so as to control the energy storage device by adopting the optimal power control strategy combined with the charging and discharging target power of each energy storage device. The safety and operation efficiency of the energy storage system in the wind farm can be improved.

[0074] In some embodiments, the maximum charging power and the maximum discharging power of each energy storage device can be obtained according to the SOC value and the maximum rated power of each energy storage device. Figure 3 , Figure 3 FIG. 1 is a flow chart of another wind-storage fusion control method provided in an embodiment of the present application. Figure 3 As shown, the method may include but is not limited to the following steps:

[0075] Step S301: Obtain the first output power reference value of each collector line in the current control period.

[0076] The actual output power corresponding to each collector and the SOC value of each energy storage device.

[0077] In the embodiments of the present application, step S301 can be implemented in any of the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0078] Step S302: Obtain the rated charge and discharge power of each energy storage device.

[0079] In the embodiments of the present application, step S302 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0080] Step S303: acquiring a charging coefficient and a discharging coefficient of each energy storage device based on the SOC value of each energy storage device.

[0081] It should be noted that if the power difference of a certain collector is positive, it means that the first output power reference value is greater than the actual power, and the energy storage device in the collector needs to be discharged, then it is necessary to obtain the discharge target power of the energy storage device, and at this time it is necessary to obtain the discharge coefficient of the energy storage device; if the power difference of a certain collector is negative, it means that the first output power reference value of the collector is less than the actual power, and the energy storage device in the collector needs to be charged, then it is necessary to obtain the charging target power of the energy storage device, and at this time it is necessary to obtain the charging coefficient of the energy storage device.

[0082] Exemplarily, multiple numerical ranges are preset, and corresponding charging coefficients and discharging coefficients are set for each numerical range, so as to obtain the charging coefficients and discharging coefficients corresponding to the target threshold range to which the SOC of each energy storage device belongs, as the charging and discharging coefficients corresponding to each energy storage device.

[0083] It should be noted that, in the embodiments of the present application, the above-mentioned charge and discharge coefficient includes a charge coefficient and a discharge coefficient.

[0084] In an optional implementation, a charging coefficient of each energy storage device is obtained based on the SOC value of each energy storage device, including: in response to the SOC value being less than a first threshold, using a preset first coefficient as a charge and discharge coefficient; or, in response to the SOC value being greater than or equal to the first threshold and less than a second threshold, obtaining the charging coefficient based on the difference between the SOC value and the second threshold; or, in response to the SOC value being greater than or equal to the second threshold, using a preset second coefficient as the charge and discharge coefficient.

[0085] In some embodiments, the first threshold may be 0.8, the second threshold may be 0.9, the first coefficient may be 1, and the second coefficient may be 0.

[0086] Exemplarily, taking the energy storage device as an electrochemical energy storage device as an example, the charging coefficient corresponding to the electrochemical energy storage device can be obtained based on the following formula.

[0087]

[0088] In the formula, K B_c,i is the charge coefficient of the electrochemical energy storage device on the i-th collector, SOC B,i is the SOC value of the electrochemical energy storage device on the i-th collector.

[0089] Exemplarily, taking the energy storage device as a supercapacitor energy storage device as an example, the charging coefficient corresponding to the supercapacitor energy storage device can be obtained based on the following formula.

[0090]

[0091] In the formula, K S_c,i is the charging coefficient of the supercapacitor energy storage device on the i-th collector line, SOC S,i is the SOC value of the supercapacitor energy storage device on the i-th collector line.

[0092] In an optional implementation, the above-mentioned obtaining the discharge coefficient of each energy storage device based on the SOC value of each energy storage device may include: in response to the SOC value being less than a third threshold, using a preset third coefficient as the charge and discharge coefficient; or, in response to the SOC value being greater than or equal to the third threshold and less than a fourth threshold, obtaining the discharge coefficient based on the difference between the SOC value and the fourth threshold; or, in response to the SOC value being greater than or equal to the fourth threshold, using a preset fourth coefficient as the charge and discharge coefficient.

[0093] In some embodiments, the third threshold may be 0.1, the fourth threshold may be 0.2, the third coefficient may be 0, and the fourth coefficient may be 1.

[0094] Exemplarily, taking the energy storage device as an electrochemical energy storage device as an example, the discharge coefficient corresponding to the electrochemical energy storage device can be obtained based on the following formula.

[0095]

[0096] In the formula, K B_d,i is the discharge coefficient of the electrochemical energy storage device on the i-th collector, SOC B,i is the SOC value of the electrochemical energy storage device on the i-th collector.

[0097] Exemplarily, taking the energy storage device as a supercapacitor energy storage device as an example, the charging coefficient corresponding to the supercapacitor energy storage device can be obtained based on the following formula.

[0098]

[0099] In the formula, K S_d,i is the discharge coefficient of the supercapacitor energy storage device on the i-th collector line, SOC S,i is the SOC value of the supercapacitor energy storage device on the i-th collector line.

[0100] Step S304: based on the rated charge and discharge power and the charging coefficient of each energy storage device, the maximum charging power of each energy storage device is obtained, and based on the rated charge and discharge power and the discharge coefficient of each energy storage device, the maximum discharge power of each energy storage device is obtained.

[0101] For example, taking the energy storage device as an electrochemical energy storage device, the process of obtaining the maximum charging power can be expressed as follows:

[0102]

[0103] in, is the maximum charging power of the electrochemical energy storage device on the i-th charging line, is the charge coefficient of the electrochemical energy storage device, P B,max is the rated charge and discharge power of the electrochemical energy storage device.

[0104] For example, taking the energy storage device as a supercapacitor energy storage device as an example, the process of obtaining the maximum charging power can be expressed as follows:

[0105]

[0106] in, is the maximum charging power of the supercapacitor energy storage device on the i-th charging line, is the charging coefficient of the supercapacitor energy storage device, P S,max is the rated charge and discharge power of the supercapacitor energy storage device. For example, taking the energy storage device as an electrochemical energy storage device, the process of obtaining the maximum discharge power can be expressed as follows:

[0107]

[0108] in, is the maximum discharge power of the electrochemical energy storage device on the i-th charging line, is the discharge coefficient of the electrochemical energy storage device, P B,max is the rated charge and discharge power of the electrochemical energy storage device. For example, taking the energy storage device as a supercapacitor energy storage device, the process of obtaining the maximum discharge power can be expressed as follows:

[0109]

[0110] in, is the maximum discharge power of the supercapacitor energy storage device on the i-th charging line, is the discharge coefficient of the supercapacitor energy storage device, P S,max is the rated charge and discharge power of the supercapacitor energy storage device.

[0111] Step S306: obtaining a charging modulation voltage or a discharging modulation voltage of the energy storage device.

[0112] In the embodiments of the present application, step S306 can be implemented in any of the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0113] Step S307: Based on the charge and discharge target power of each energy storage device and the charge modulation voltage or discharge modulation voltage of each energy storage device, the energy storage device is controlled to charge and discharge, and the wind turbine corresponding to the collector is controlled according to the optimal power operation model.

[0114] In the embodiments of the present application, step S307 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0115] By implementing the embodiments of the present application, the charging power or discharging power of each energy storage device can be obtained according to the SOC value of each energy storage device, so as to perform targeted control on the energy storage device based on the charging power and discharging power of each energy storage device, thereby improving the safety of the operation of the energy storage system.

[0116] In some embodiments, each collector is provided with a hybrid energy storage device comprising an electrochemical energy storage device and a supercapacitor energy storage device. As an example, see Figure 4 , Figure 4 Schematic diagram of the overall layout of a collector and hybrid energy storage device provided in an embodiment of the present application. Figure 4As shown, there are n collectors in the wind farm, each of which is equipped with m wind turbines, and an electrochemical energy storage device is connected to the DC bus of the wind turbine converter at the end of each collector. The wind turbine mainly includes a power generation system 1, a converter 2 and a box transformer 3. The electrochemical energy storage system 4 mainly consists of a battery system 4-1, a DC-DC bidirectional converter 4-2, and a circuit breaker 4-3. The outlet of the circuit breaker 4-3 is connected to the DC bus of the wind turbine converter at the end of each collector. The supercapacitor energy storage system 5 mainly consists of a supercapacitor 5-1, a DC-DC bidirectional converter 5-2, a circuit breaker 5-3, etc. The outlet of the circuit breaker 5-3 is connected to the DC bus of the wind turbine converter at the end of each collector. Each collector is connected to the 66kV AC bus 8 of the booster station through a circuit breaker 7, and then the voltage is increased to 220kV through a booster transformer 9 and then connected to the grid. Based on the power difference corresponding to each collector line, a corresponding portion of the power difference can be allocated to different energy storage devices on each collector line. As an example, see Figure 5 Figure 5 FIG. 1 is a flow chart of another wind-storage fusion control method provided in an embodiment of the present application. Figure 5 As shown, the method may include but is not limited to the following steps:

[0117] Step S501: obtaining a first output power reference value of each collector line, an actual output power corresponding to each collector line, and an SOC value of each energy storage device in a current control period.

[0118] In the embodiments of the present application, step S501 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0119] Step S502: Based on the SOC value of each energy storage device, the maximum charging power and the maximum discharging power of each energy storage device are obtained.

[0120] In the embodiments of the present application, step S502 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0121] Step S503: Acquire the historical power deviation value and the historical charging and discharging power target value corresponding to the previous historical control period adjacent to the current control period.

[0122] Step S504: Based on the historical power deviation value and the historical charging and discharging power target value, the power difference value is low-pass filtered to obtain a low-frequency component value and a high-frequency component value.

[0123] Exemplarily, the low-pass filter can be expressed as:

[0124]

[0125] Among them, s is the Laplace operator, s is a complex number, s=σ+jω, σ is the real part, ω is the imaginary part, and τ is the time constant.

[0126] The low-frequency component value obtained by low-pass filtering the power difference using the above low-pass filter can be expressed as follows:

[0127]

[0128] in, is the low frequency component value, is the power difference.

[0129] Exemplarily, the high frequency component value may be expressed as follows:

[0130]

[0131] in, is the high frequency component value, is the power difference.

[0132] It should be noted that for a continuous-time system, after first-order low-pass filtering, the relationship between output and input can be expressed as:

[0133]

[0134] In the formula, R(t) is the input variable, and C(t) is the output variable, that is, the variable after low-pass filtering the input.

[0135] Performing Laplace transform on the above equation, we can get:

[0136]

[0137] Converting the above formula into frequency domain yields:

[0138]

[0139] Then perform z-transformation on the above equation to convert the continuous system into a discrete system. Substituting into the following formula:

[0140]

[0141] Where T is the iteration step, i.e., the duration of each control period, R(z) is the input component value of this time step (i.e., control period), and R(z)z -1 Enter the component value for the previous time step, C(z)z -1 is the output component value of the previous time step, and C(z) is the output component value of this time step.

[0142] Therefore, the power difference may be low-pass filtered based on the power deviation value of the current control period, the historical power deviation value of the previous historical control period, and the historical charging and discharging target total power.

[0143] Step S505: taking the low-frequency component value as the partial power difference value corresponding to the electrochemical energy storage device, and taking the high-frequency component value as the partial power difference value corresponding to the supercapacitor energy storage device.

[0144] Step S506: based on the partial power difference and the maximum charging power corresponding to each energy storage device, obtain the charging target power of each energy storage device, or based on the partial power difference and the maximum discharging power corresponding to each energy storage device, obtain the discharging target power of each energy storage device.

[0145] Exemplarily, the partial power difference corresponding to each energy storage device is compared with the maximum charging power and the maximum discharging power corresponding to the energy storage device. If the partial power difference corresponding to the energy storage device is within the power range consisting of the maximum charging power and the maximum discharging power corresponding to the energy storage device, the partial power difference corresponding to the energy storage device is used as the charging and discharging target power of the energy storage device; if the partial power difference corresponding to the energy storage device is not within the power range consisting of the maximum charging power and the maximum discharging power corresponding to the energy storage device, the one of the maximum charging power and the maximum discharging power corresponding to the energy storage device that has a smaller difference with the partial power difference is used as the charging and discharging target power of the energy storage device.

[0146] In an optional implementation, based on the partial power difference, the maximum charging power and the maximum discharging power corresponding to each energy storage device, the charging and discharging target power of each energy storage device is obtained, including: in response to the partial power difference being less than the maximum charging power, the maximum discharging power is used as the charging and discharging target power of the energy storage device in the current control period; or, in response to the partial power difference being greater than or equal to the maximum discharging power and less than or equal to the maximum charging power, the partial power difference is used as the charging and discharging target power of the energy storage device in the current control period; or, in response to the partial power difference being greater than the maximum discharging power, the maximum discharging power is used as the charging and discharging target power of the energy storage device in the current control period.

[0147] Exemplarily, in response to the partial power difference being less than the maximum charging power, the maximum discharging power is used as the charging and discharging target power of the energy storage device in the current control period.

[0148] As an example, taking the energy storage device as an electrochemical energy storage device, the above process can be expressed as follows:

[0149]

[0150] in, is the target power of charge and discharge of the electrochemical energy storage device on the i-th collector, is the maximum charging power of the electrochemical energy storage device on the i-th collector.

[0151] As an example, taking the energy storage device as a supercapacitor energy storage device, the above process can be expressed as follows:

[0152]

[0153] in, is the charging and discharging target power of the supercapacitor energy storage device on the i-th collector line, is the maximum charging power of the supercapacitor energy storage device on the i-th collector.

[0154] Exemplarily, in response to the partial power difference being greater than or equal to the maximum discharge power and less than or equal to the maximum charge power, the partial power difference is used as the charge and discharge target power of the energy storage device in the current control period.

[0155] As an example, taking the energy storage device as an electrochemical energy storage device, the above process can be expressed as follows:

[0156]

[0157] in, is the target power of charge and discharge of the electrochemical energy storage device on the i-th collector, is the partial power difference corresponding to the electrochemical energy storage device on the i-th collector line.

[0158] As an example, taking the energy storage device as a supercapacitor energy storage device, the above process can be expressed as follows:

[0159]

[0160] in, is the charging and discharging target power of the supercapacitor energy storage device on the i-th collector line, is the partial power difference corresponding to the supercapacitor energy storage device on the i-th collector line.

[0161] Exemplarily, in response to the partial power difference being greater than the maximum discharge power, the maximum discharge power is used as the charge and discharge target power of the energy storage device in the current control period.

[0162] As an example, taking the energy storage device as an electrochemical energy storage device, the above process can be expressed as follows:

[0163]

[0164] in, is the target power of charge and discharge of the electrochemical energy storage device on the i-th collector, is the maximum discharge power corresponding to the electrochemical energy storage device on the i-th collector.

[0165] As an example, taking the energy storage device as a supercapacitor energy storage device, the above process can be expressed as follows:

[0166]

[0167] in, is the charging and discharging target power of the supercapacitor energy storage device on the i-th collector line, is the maximum discharge power corresponding to the supercapacitor energy storage device on the i-th collector line.

[0168] Step S507: obtaining a charging modulation voltage or a discharging modulation voltage of the energy storage device.

[0169] In the embodiments of the present application, step S507 can be implemented by any of the methods in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0170] Step S508: Based on the target charging and discharging power of the energy storage device and the charging modulation voltage or the discharging modulation voltage of the energy storage device, the energy storage device is controlled to charge and discharge, and the wind turbine corresponding to the collector is controlled according to the optimal power operation model.

[0171] In the embodiments of the present application, step S508 can be implemented in any of the ways in the embodiments of the present application, and the embodiments of the present application do not limit this and will not be described in detail.

[0172] In some embodiments of the present application, the method further includes: in response to the partial power difference being less than the maximum charging power and the SOC value being less than or equal to the first threshold, based on the preset first coefficient, the control period duration and the first output power reference value, calculating and obtaining the second output power reference value for the next control period; in response to the partial power difference being less than the maximum charging power and the SOC value being greater than the first threshold, calculating and obtaining the second coefficient based on the difference between the SOC value and the first threshold and the first coefficient, and calculating and obtaining the second output power reference value for the next control period based on the second coefficient, the control period duration and the first output power reference value; in response to the partial power difference being greater than the maximum discharge power and the SOC value being less than the preset second threshold, calculating and obtaining the fourth coefficient based on the difference between the SOC value and the second threshold and the preset third coefficient, and calculating and obtaining the second output power reference value for the next control period based on the fourth coefficient, the control period duration and the first output power reference value; in response to the partial power difference being greater than the maximum discharge power and the SOC value being less than the preset second threshold, calculating and obtaining the second output power reference value for the next control period based on the third coefficient, the control period duration and the first output power reference value.

[0173] Exemplarily, in response to the partial power difference being less than the maximum charging power and the SOC value being less than or equal to a first threshold, a second output power reference value for the next control period is calculated based on a preset first coefficient, a control period duration and a first output power reference value.

[0174] As an example, taking the energy storage device as an electrochemical energy storage device, the above steps can be expressed as follows:

[0175]

[0176] in, is the second output power reference value of the next control period of the i-th collector line, k0 is the first coefficient, ΔT is the length of the control period, is the first output power reference value corresponding to the collector line.

[0177] Exemplarily, in response to the partial power difference being less than the maximum charging power and the SOC value being greater than a first threshold, a second coefficient is calculated based on the difference between the SOC value and the first threshold and the first coefficient, and a second output power reference value for the next control period is calculated based on the second coefficient, the control period duration and the first output power reference value.

[0178] As an example, taking the first threshold value as 0.8 and the energy storage device as an electrochemical energy storage device, the above steps can be expressed as follows:

[0179] k2(j)=50×(SOC B,i -0.8)×k0+k0

[0180]

[0181] Among them, k0 is the first coefficient, SOC B,i is the SOC value of the electrochemical energy storage device on the i-th collector, k2(j) is the second coefficient corresponding to the collector, ΔT is the duration of the control period, is the first output power reference value corresponding to the collector line.

[0182] Exemplarily, in response to the partial power difference being greater than the maximum discharge power and the SOC value being less than a preset second threshold, a fourth coefficient is calculated based on the difference between the SOC value and the second threshold and a preset third coefficient, and based on the fourth coefficient, the control period duration and the first output power reference value, the second output power reference value for the next control period is calculated.

[0183] As an example, taking the second threshold value as 0.2 and the energy storage device as an electrochemical energy storage device, the above steps can be expressed as follows:

[0184] k4(j)=50×(0.2-SOC B,i )×k3+k3

[0185]

[0186] Among them, k3 is the third coefficient, SOC B,i is the SOC value of the electrochemical energy storage device on the i-th collector, k4(j) is the fourth coefficient corresponding to the collector, is the second output power reference value corresponding to the collector line, ΔT is the duration of the control period, is the first output power reference value corresponding to the collector line.

[0187] Exemplarily, in response to the partial power difference being greater than the maximum discharge power and the SOC value being less than a preset second threshold, a second output power reference value for the next control period is calculated based on the third coefficient, the control period duration and the first output power reference value.

[0188] As an example, taking the energy storage device as an electrochemical energy storage device, the above steps can be expressed as follows:

[0189] k4(j)=k3

[0190]

[0191] Among them, k3 is the third coefficient, k4(j) is the fourth coefficient corresponding to the collector line, is the second output power reference value corresponding to the collector line, ΔT is the duration of the control period, is the first output power reference value corresponding to the collector line.

[0192] It should be noted that, in some embodiments, the first coefficient may be the same as the third coefficient.

[0193] By implementing the embodiments of the present application, the charging and discharging target powers of the supercapacitor energy storage device and the electrochemical energy storage device can be obtained respectively according to the power difference. Thus, the energy storage device can be controlled based on the charging and discharging target power of each energy storage device. The operation safety and efficiency of the energy storage system in the wind farm can be improved.

[0194] In some embodiments, the above method also includes: obtaining optimal control strategy parameters and inverter modulation voltage control target value; controlling the machine-side converter of each collector wind turbine converter based on the optimal control strategy parameters; and controlling the inverter based on the inverter modulation voltage control target value.

[0195] In an optional implementation, the optimal control strategy parameters may be obtained through the following steps.

[0196] C1: Obtain the speed measurement value and three-phase current measurement value of the wind turbine generator.

[0197] C2: Calculate the wind turbine rotor phase based on the speed measurement.

[0198] Exemplarily, the above calculation process can be expressed as follows:

[0199]

[0200] Among them, ω g is the measured value of the wind turbine speed, θ g is the wind turbine rotor phase.

[0201] C3: Calculate the wind turbine generator control target torque based on the speed measurement value.

[0202] Exemplarily, the above calculation process can be expressed as follows:

[0203]

[0204] Where, T * is the target torque of wind turbine control, K opt is the optimal power control torque coefficient. g is the measured value of the wind turbine speed.

[0205] C4: Calculate the wind turbine generator q-axis current control target value based on the generator control target torque.

[0206] Exemplarily, the above calculation process can be expressed as follows:

[0207]

[0208] In the formula, is the wind turbine q-axis current control target value, n p is the number of wind turbine pole pairs, ψ f is the permanent magnet flux of the wind turbine generator, include and

[0209] C5: Perform dq transformation on the three-phase current measurement values ​​to obtain dq axis currents.

[0210] Exemplarily, the above calculation process can be expressed as follows:

[0211]

[0212] In the formula, i sd 、i sq is the dq axis current, T abc-dq is the transformation matrix from the abc coordinate system to the dq coordinate system, u sa 、u sb and u sc It is the three-phase current measurement value.

[0213] C6: Calculate the voltage value corresponding to the current loop based on the dq axis current.

[0214] Exemplarily, the above calculation process can be expressed as follows:

[0215]

[0216] In the formula, u sid 、u siq is the voltage value corresponding to the current loop, K p_si is the proportional gain, K i_si is the integral gain, and s is the complex frequency variable in the Laplace transform.

[0217] C7: Based on the voltage value corresponding to the current loop and combined with the dq axis cross-influence term, the wind turbine stator dq axis voltage control target value is calculated.

[0218] Exemplarily, the above calculation process can be expressed as follows:

[0219]

[0220] In the formula, ω e It is the electromagnetic speed of the generator rotor, that is, the product of the measured speed of the wind turbine and the number of pole pairs of the wind turbine.

[0221] C8: Perform dq coordinate inverse transformation on the wind turbine stator dq axis voltage control target value, and calculate the converter side converter modulation voltage control target value.

[0222] Exemplarily, the above calculation process can be expressed as follows:

[0223]

[0224] in, and The voltage modulation control target value is set for the converter on the machine side of the converter.

[0225] By implementing the embodiments of the present application, the modulation voltage control target value of the converter on the machine side of the converter can be calculated, so as to coordinately control the converter on the machine side of the converter to further improve the safety of the energy storage device.

[0226] As an example, see Figure 6 , Figure 6 Schematic diagram of a power controller provided in an embodiment of the present application. Figure 6 As shown, the power controller includes a generator rotor phase calculation module 10, an optimal power operation control module 11 and a current inner loop control module 12. The generator rotor phase calculation module 10 inputs the generator measured speed and outputs the generator rotor phase. The optimal power operation control module 11 includes an optimal power control torque calculation unit 11-1 and a q-axis current control target value calculation unit 11-2. The optimal power control torque calculation unit 11-1 inputs the generator measured speed and outputs the generator control target torque. The q-axis current control target value calculation unit 11-2 inputs the motor control target torque and outputs the generator q-axis current control target value. The current inner loop calculation module 12 includes PI calculation units 12-1 and 12-2, a dq coordinate transformation unit 12-3 and a dq coordinate inverse transformation unit 12-4.

[0227] In an optional implementation, the inverter modulation voltage control target value may be acquired through the following steps.

[0228] D1: Obtain the measured value of the converter DC bus capacitance, the capacitance reference value, the reactive power measured value and reactive power reference value, and the measured value of the three-phase voltage output by the inverter.

[0229] D2: Perform proportional integral calculation based on the capacitance measurement value and the prime capacitance reference value to obtain the d-axis current control target value.

[0230] Exemplarily, the above calculation process can be expressed as follows:

[0231]

[0232] in, is the d-axis current control target value, U DC is the capacitance measurement value, is the capacitance reference value.

[0233] D3: Based on the reactive power measurement value and the reactive power reference value, the q-axis current control target value is calculated.

[0234] Exemplarily, the above calculation process can be expressed as follows:

[0235]

[0236] in, is the q-axis current control target value, Q i is the reactive power measurement value, It is the reactive power reference value.

[0237] D4: Perform dq transformation on the inverter output three-phase current measurement value to obtain dq axis current, and perform proportional integral calculation on the dq axis current, d axis current control target value and q axis current control target value to obtain the voltage value corresponding to the current loop.

[0238] Exemplarily, the above calculation process can be expressed as follows:

[0239]

[0240] Among them, u id 、u iq is the voltage value corresponding to the current loop, is the d-axis current control target value, is the q-axis current control target value, i d and i q is the dq axis current.

[0241] D5: Based on the voltage value corresponding to the current loop, the inverter dq axis voltage control target value is calculated in combination with the voltage value corresponding to the current loop.

[0242] Exemplarily, the above calculation process can be expressed as follows:

[0243]

[0244] in, and is the inverter dq axis voltage control target value.

[0245] D6: Perform coordinate inverse transformation on the inverter dq axis voltage control target value to obtain the inverter modulation voltage control target value.

[0246] Exemplarily, the above calculation process can be expressed as follows:

[0247]

[0248] in, and Modulate the voltage control target value for the inverter.

[0249] By implementing the embodiments of the present application, the inverter modulation voltage control target value can be obtained to coordinately control the inverter, thereby further improving the safety of the energy storage device.

[0250] As an example, see Figure 7 , Figure 7 Schematic diagram of a wind turbine inverter grid-side conversion controller provided in an embodiment of the present application. Figure 7 As shown, the controller includes a phase-locked loop phase angle calculation module 30, a current outer loop calculation module 31 and a current inner loop calculation module 32. The input of the phase-locked loop phase angle calculation module 30 is the three-phase voltage measured by the power grid, and the output is the power grid frequency and phase angle. The current outer loop calculation module 31 includes a d-axis current outer loop PI calculation 31-1 and a q-axis current outer loop PI calculation 31-2. The d-axis current outer loop PI calculation 31-1 inputs the measured value and reference value of the DC bus capacitance of the converter, and the output is the d-axis current control target value. The q-axis current outer loop PI calculation 31-2 inputs the reactive power measurement value and reference value, and the output is the q-axis current control target value. The current inner loop calculation module 32 includes PI calculations 32-1 and 32-2, dq coordinate transformation 32-3 and dq coordinate inverse transformation 32-4.

[0251] As an example, see Figure 8 , Figure 8 It is a schematic diagram of a phase-locked loop calculation process provided in an embodiment of the present application.

[0252] See also Fig. 9 , Fig. 9 1 is a flow chart of a method for controlling a hybrid energy storage device on the DC side of a collector for smoothing wind power output power provided in an embodiment of the present application. Fig. 9 As shown, firstly, the average output power of each collector in the first 10 minutes is counted, and it is used as the initial reference value of the power smoothing output of each collector. And the corresponding charge and discharge limit coefficient is determined according to the SOC of each energy storage device, and the current maximum charging power and maximum discharging power of each energy storage device are obtained based on the charge and discharge limit coefficient of each energy storage device. Then, the deviation between the power smoothing output reference value of each collector and the actual value is calculated. And based on the deviation value corresponding to each collector and the current maximum charging power and maximum discharging power of the energy storage device in the same collector, the reference value of the power smoothing output of the energy storage device and the next control period are controlled.

[0253] At the same time, the converters on the machine side of each collector line wind turbine converter adopt the optimal power control strategy to achieve the goal of maximizing wind energy absorption. The DC side energy storage device of the wind turbine at the end of each collector line tracks the target power through a DC-DC bidirectional converter; the grid side converter of the wind turbine converter at the end of each collector line stabilizes the DC bus voltage through current loop control; the grid side converters of the remaining wind turbine converters on each collector line stabilize the DC bus voltage through current loop control.

[0254] See also Fig.10 , Fig.10 Schematic diagram of the structure of a wind-storage fusion control device provided in an embodiment of the present application. A wind farm includes at least one collector line, and a hybrid energy storage device is arranged in each collector line. Fig.10 As shown, the device 1000 includes: the device includes: a first acquisition module 1001, which is used to obtain the first output power reference value of each collector in the current control period, the actual output power corresponding to each collector and the SOC value of each energy storage device; a first processing module 1002, which is used to obtain the maximum charging power and the maximum discharging power of each energy storage device based on the SOC value of each energy storage device; a second processing module 1003, which is used to obtain the charging and discharging target power of each energy storage device based on the power difference between the first output power reference value and the actual output power, the maximum charging power and the maximum discharging power; a second acquisition module 1004, which is used to obtain the charging modulation voltage or the discharging modulation voltage of the energy storage device; a third processing module 1005, which is used to control the charging and discharging of the energy storage device based on the charging and discharging target power of each energy storage device, the charging modulation voltage or the charging modulation voltage of each energy storage device, and control the wind turbine corresponding to the collector according to the optimal power operation mode.

[0255] In one implementation, the first processing module 1002 may be used to: obtain the rated charge and discharge power of each energy storage device; obtain the charging coefficient and the discharging coefficient of each energy storage device based on the SOC value of each energy storage device; obtain the maximum charging power of each energy storage device based on the rated charge and discharge power and the charging coefficient of each energy storage device, and obtain the maximum discharging power of each energy storage device based on the rated charge and discharge power and the discharge coefficient of each energy storage device.

[0256] In one implementation, the second processing module 1003 can be used to: obtain a historical power deviation value and a historical charge and discharge power target value corresponding to a previous historical control period adjacent to the current control period; based on the historical power deviation value and the historical charge and discharge power target value, perform low-pass filtering on the power difference to obtain a low-frequency component value and a high-frequency component value; use the low-frequency component value as a partial power difference corresponding to the electrochemical energy storage device, and use the high-frequency component value as a partial power difference corresponding to the supercapacitor energy storage device; based on the partial power difference, the maximum charging power and the maximum discharging power corresponding to each energy storage device, obtain the charge and discharge target power of each energy storage device.

[0257] In an optional implementation, the second processing module 1003 can be used to: in response to the partial power difference being less than the maximum charging power, use the maximum charging power as the target charging and discharging power of the energy storage device in the current control period; or, in response to the partial power difference being greater than or equal to the maximum discharging power and less than or equal to the maximum charging power, use the partial power difference as the target charging and discharging power of the energy storage device in the current control period; or, in response to the partial power difference being greater than the maximum discharging power, use the maximum discharging power as the target charging and discharging power of the energy storage device in the current control period.

[0258] In an optional implementation, the second processing module 1003 can also be used to: in response to the partial power difference being less than the maximum charging power and the SOC value being less than or equal to the first threshold, based on a preset first coefficient, the control period duration and the first output power reference value, calculate and obtain the second output power reference value for the next control period; or, in response to the partial power difference being less than the maximum charging power and the SOC value being greater than the first threshold, calculate and obtain the second coefficient based on the difference between the SOC value and the first threshold and the first coefficient, and calculate and obtain the next control period based on the second coefficient, the control period duration and the first output power reference value. a second output power reference value; or, in response to the partial power difference being greater than the maximum discharge power and the SOC value being less than a preset second threshold, a fourth coefficient is calculated based on the difference between the SOC value and the second threshold and a preset third coefficient, and based on the fourth coefficient, the control period duration and the first output power reference value, the second output power reference value for the next control period is calculated; or, in response to the partial power difference being greater than the maximum discharge power and the SOC value being less than a preset second threshold, the second output power reference value for the next control period is calculated based on the third coefficient, the control period duration and the first output power reference value.

[0259] In one implementation, the apparatus further includes a fourth processing module. As an example, see Fig.11 , Fig.11 Schematic diagram of another wind-storage fusion control device provided in an embodiment of the present application. Fig.11As shown, the device 1100 also includes a fourth processing module 1106, which is used to: obtain optimal control strategy parameters and inverter modulation voltage control target value; control the machine-side converter of each collector wind turbine converter based on the optimal control strategy parameters; and control the inverter based on the inverter modulation voltage control target value. Fig.11 Modules 1101 to 1105 in Fig.10 Modules 1001 to 1005 in the embodiment have the same structure and function.

[0260] Through the device of the embodiment of the present application, the power difference corresponding to each collector line can be obtained based on the output power reference value and actual output power corresponding to each collector line, and the maximum charging power and maximum discharging power of the energy storage device can be obtained based on the SOC value of the energy storage device in each collector line, so as to obtain the charging and discharging target power of each energy storage device based on the power difference between the first output power reference value and the actual output power, the maximum charging power and the maximum discharging power, so as to control the energy storage device by adopting the optimal power control strategy combined with the charging and discharging target power of each energy storage device. It can improve the safety and operation efficiency of the energy storage system in the wind farm.

[0261] It should be noted that the aforementioned explanation of the embodiment of the wind-storage fusion control method is also applicable to the wind-storage fusion control device of this embodiment, and will not be repeated here.

[0262] In order to implement the above embodiment, the present application also proposes an electronic device. Fig.12 , Fig.12 Schematic diagram of the structure of the electronic device provided in the embodiment of the present application. Fig.12 As shown, the electronic device 1200 includes: a processor 1201, and a memory 1202 communicatively connected to the processor 1201; the memory 1202 stores computer-executable instructions; the processor 1201 executes the computer-executable instructions stored in the memory to implement the method provided in the aforementioned embodiment.

[0263] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0264] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0265] In the description of this application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in this article is merely a way to describe the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] 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 the 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 can contain, store, communicate, propagate or transmit 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 of computer-readable media (a non-exhaustive list) 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.

[0270] It should be understood that the various parts of the present application can be implemented in hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in 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 on a data component value, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0271] 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.

[0272] 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.

[0273] 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 wind-storage fusion control method, characterized in that: The wind farm comprises at least one collector line, each of which is provided with an electrochemical energy storage device and a supercapacitor energy storage device, and the method comprises: Acquire a first output power reference value of each of the collector lines, an actual output power corresponding to each of the collector lines, and an SOC value of each of the energy storage devices during a current control period; Based on the SOC value of each of the energy storage devices, obtaining the maximum charging power and the maximum discharging power of each of the energy storage devices; Based on the power difference between the first output power reference value and the actual output power, the maximum charging power and the maximum discharging power, obtaining a charging and discharging target power of each of the energy storage devices; Obtaining a charge modulation voltage or a discharge modulation voltage of the energy storage device; Based on the charging and discharging target power of each energy storage device, the charging modulation voltage of each energy storage device or the charging modulation voltage, the charging and discharging of the energy storage device is controlled, and the wind turbine corresponding to the collector line is controlled according to the optimal power operation mode.

2. The method according to claim 1, characterized in that The obtaining, based on the SOC value of each of the energy storage devices, the maximum charging power and the maximum discharging power of each of the energy storage devices comprises: Obtaining the rated charge and discharge power of each of the energy storage devices; Acquire a charging coefficient and a discharging coefficient of each of the energy storage devices based on the SOC value of each of the energy storage devices; Based on the rated charge and discharge power and the charging coefficient of each energy storage device, the maximum charging power of each energy storage device is obtained, and based on the rated charge and discharge power and the discharge coefficient of each energy storage device, the maximum discharge power of each energy storage device is obtained.

3. The method according to claim 1, characterized in that The acquiring the charging and discharging target power of each of the energy storage devices based on the power difference between the first output power reference value and the actual output power, the maximum charging power, and the maximum discharging power includes: Obtaining a historical power deviation value and a historical charge and discharge power target value corresponding to a previous historical control period adjacent to the current control period; Based on the historical power deviation value and the historical charge and discharge power target value, low-pass filtering is performed on the power difference value to obtain a low-frequency component value and a high-frequency component value; Using the low-frequency component value as the partial power difference corresponding to the electrochemical energy storage device, and using the high-frequency component value as the partial power difference corresponding to the supercapacitor energy storage device; Based on the partial power difference, the maximum charging power and the maximum discharging power corresponding to each of the energy storage devices, the charging and discharging target power of each of the energy storage devices is obtained.

4. The method according to claim 3, characterized in that The acquiring the charging and discharging target power of each energy storage device based on the partial power difference, the maximum charging power and the maximum discharging power corresponding to each energy storage device, comprises: In response to the partial power difference being less than the maximum charging power, taking the maximum charging power as the charging and discharging target power of the energy storage device in the current control period; or, In response to the partial power difference being greater than or equal to the maximum discharge power and less than or equal to the maximum charge power, using the partial power difference as the charge and discharge target power of the energy storage device in the current control period; or, In response to the partial power difference being greater than the maximum discharge power, the maximum discharge power is used as the charge and discharge target power of the energy storage device in the current control period.

5. The method according to claim 4, characterized in that The method further comprises: In response to the partial power difference being less than the maximum charging power and the SOC value being less than or equal to a first threshold, a second output power reference value for a next control period is calculated based on a preset first coefficient, a control period duration, and the first output power reference value; or, In response to the partial power difference being less than the maximum charging power and the SOC value being greater than the first threshold, a second coefficient is calculated based on the difference between the SOC value and the first threshold and the first coefficient, and a second output power reference value for the next control period is calculated based on the second coefficient, the control period duration and the first output power reference value; or, In response to the partial power difference being greater than the maximum discharge power and the SOC value being less than a preset second threshold, a fourth coefficient is calculated based on the difference between the SOC value and the second threshold and a preset third coefficient, and a second output power reference value for the next control period is calculated based on the fourth coefficient, the control period duration and the first output power reference value; or, In response to the partial power difference being greater than the maximum discharge power and the SOC value being less than a preset second threshold, a second output power reference value for the next control period is calculated based on the third coefficient, the control period duration and the first output power reference value.

6. The method according to claim 1, characterized in that The method further comprises: Obtaining optimal control strategy parameters and inverter modulation voltage control target value; Controlling the machine-side converters of each collector wind turbine converter based on the optimal control strategy parameters; The inverter is controlled based on the inverter modulation voltage control target value.

7. A wind-storage fusion control device, characterized in that: The wind farm comprises at least one collector line, each of which is provided with an electrochemical energy storage device and a supercapacitor energy storage device, wherein the device comprises: A first acquisition module is used to acquire a first output power reference value of each of the collector lines, an actual output power corresponding to each of the collector lines, and an SOC value of each of the energy storage devices during a current control period; A first processing module, configured to obtain a maximum charging power and a maximum discharging power of each of the energy storage devices based on an SOC value of each of the energy storage devices; A second processing module, configured to obtain a charging and discharging target power of each of the energy storage devices based on a power difference between the first output power reference value and the actual output power, the maximum charging power, and the maximum discharging power; A second acquisition module, used to acquire a charging modulation voltage or a discharging modulation voltage of the energy storage device; The third processing module is used to control the charging and discharging of the energy storage device based on the charging and discharging target power of each energy storage device, the charging modulation voltage of each energy storage device or the charging modulation voltage, and control the wind turbine corresponding to the collector line according to the optimal power operation mode.

8. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 6.

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

10. A computer program product, characterized in that The method comprises a computer program, which implements the method according to any one of claims 1 to 6 when being executed by a processor.

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