Fan alternating current side energy storage control method for smoothing wind power output power

Abstract

The invention provides a fan alternating current side energy storage control method for smoothing wind power output power. The fan alternating current side energy storage control method comprises the steps that historical output power and an SOC value are acquired; determining a charging and discharging limiting condition based on the SOC value; the historical output power is corrected based on the charging and discharging limiting conditions, so that the first target output power of the wind turbine generator in the next time period and the second target output power of the electrochemical energy storage device are determined; and performing smooth adjustment based on the first target output power and the second output power. By setting the charging and discharging limiting conditions and then correcting the historical output power based on the charging and discharging limiting conditions, the stability of wind power output can be greatly improved, the harmonic content is reduced, the wind power output is closer to conventional energy, wind power can better participate in dispatching arrangement of a power grid, the competitiveness of a wind power plant in the electric power market is improved, and the economic benefit is increased. Large-scale grid connection and consumption of wind power are promoted, the management and control effect on the wind power plant and the robustness of the system are improved, the management and control cost can be reduced, and the service life of equipment can be prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind power generation control, and in particular to a method for controlling energy storage on an AC side of a wind turbine for smoothing wind power output power. Background Art

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

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

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

[0005] To this end, an object of the present disclosure is to provide a wind turbine AC side energy storage control method for smoothing wind power output power.

[0006] A second objective of the present disclosure is to provide a wind turbine AC side energy storage control device for smoothing wind power output power.

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

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

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

[0010] To achieve the above-mentioned purpose, the first aspect of the present disclosure proposes a wind turbine AC side energy storage control method for smoothing wind power output power, including: obtaining the historical output power of the wind turbine group and the SOC value of the electrochemical energy storage device on the AC side of each wind turbine group; determining the charge and discharge restriction conditions of the electrochemical energy storage device based on the SOC value; correcting the historical output power based on the charge and discharge restriction conditions to determine the first target output power of the wind turbine group and the second target output power of the electrochemical energy storage device in the next time period; and smoothly adjusting the wind turbine group and the electrochemical energy storage device based on the first target output power and the second output power, respectively.

[0011] According to one embodiment of the present disclosure, determining the charge and discharge restriction conditions of the electrochemical energy storage device based on the SOC value includes: determining the maximum discharge power and the maximum charging power of the electrochemical energy storage device based on the SOC value, and using the maximum discharge power and the maximum charging power as the charge and discharge restriction conditions.

[0012] According to one embodiment of the present disclosure, determining the maximum discharge power and the maximum charging power of the electrochemical energy storage device based on the SOC value includes: obtaining the rated power of the electrochemical energy storage device; determining the charge and discharge limit coefficient of the electrochemical energy storage device based on the SOC value; and multiplying the charge and discharge limit coefficient by the rated power to calculate the maximum discharge power and the maximum charging power of the electrochemical energy storage device.

[0013] According to one embodiment of the present disclosure, the charge and discharge restriction conditions include the maximum discharge power and the maximum charging power of the electrochemical energy storage device, and the historical output power is corrected based on the charge and discharge restriction conditions to determine the first target output power of the wind turbine in the next time period and the second target output power of the electrochemical energy storage device, including: obtaining the actual output power of the wind turbine; calculating the average value based on the historical output power as the initial control power of the electrochemical energy storage device; and determining the first target output power of the wind turbine in the next time period and the second target output power of the electrochemical energy storage device based on the actual output power, the initial control power, the maximum discharge power and the maximum charging power.

[0014] According to one embodiment of the present disclosure, the first target output power of the wind turbine in the next time period and the second target output power of the electrochemical energy storage device are determined based on the actual output power, the initial control power, the maximum discharge power and the maximum charging power, including: subtracting the actual output power from the initial control power to calculate the power deviation; comparing the power deviation with the maximum discharge power and the maximum charging power, and determining the first target output power and the second target output power based on the comparison result.

[0015] According to one embodiment of the present disclosure, the determining the first target output power and the second target output power based on the comparison result includes: in response to the power deviation being greater than or equal to the maximum discharge power and less than or equal to the maximum charging power, determining the first target output power as the initial control power and the second target output power as the power deviation value; or, in response to the power deviation being greater than the maximum charging power, calculating a target downward adjustment coefficient, and calculating a target downward adjustment value based on the target downward adjustment coefficient, determining the first target output power as the target downward adjustment value, and the second target output power as the maximum discharge power of each electrochemical energy storage device in this time period; or, in response to the power deviation being less than the maximum discharge power, calculating a target upward adjustment coefficient, and calculating a target upward adjustment value based on the target upward adjustment coefficient, determining the first target output power as the target upward adjustment value, and the second target output power as the maximum charging power of each electrochemical energy storage device in this time period.

[0016] According to an embodiment of the present disclosure, the method further includes: the wind turbine generator converter machine side is controlled by an optimal power control strategy.

[0017] To achieve the above-mentioned purpose, the second aspect of the present disclosure proposes a wind turbine AC side energy storage control device for smoothing wind power output power, including: an acquisition module, used to acquire the historical output power of the wind turbine group, and the SOC value of the electrochemical energy storage device on the AC side of each wind turbine group; a determination module, used to determine the charge and discharge restriction conditions of the electrochemical energy storage device based on the SOC value; a correction module, used to correct the historical output power based on the charge and discharge restriction conditions to determine the first target output power of the wind turbine group and the second target output power of the electrochemical energy storage device in the next time period; an adjustment module, used to smoothly adjust the wind turbine group and the electrochemical energy storage device based on the first target output power and the second output power, respectively.

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

[0019] To achieve the above-mentioned purpose, the fourth aspect embodiment of the present disclosure proposes a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to implement the wind turbine AC side energy storage control method for smoothing wind power output power as described in the first aspect embodiment of the present disclosure.

[0020] To achieve the above-mentioned purpose, the fifth aspect embodiment of the present disclosure proposes a computer program product, including a computer program, which, when executed by a processor, is used to implement the wind turbine AC side energy storage control method for smoothing wind power output power as described in the first aspect embodiment of the present disclosure.

[0021] By setting charge and discharge limit conditions, and then correcting the historical output power based on the charge and discharge limit conditions to adjust the output power of wind turbines and electrochemical energy storage devices, the stability of wind power output can be greatly improved, and the harmonic content can be reduced, making it closer to conventional energy. This will enable wind power to better participate in the dispatch of the power grid, improve the competitiveness of wind farms in the power market, promote large-scale grid connection and consumption of wind power, improve the management and control of wind farms and the robustness of the system, and at the same time reduce management and control costs and increase equipment life. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a wind turbine AC side energy storage control method for smoothing wind power output power according to an embodiment of the present disclosure;

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

[0024] Figure 3 It is a schematic diagram of another wind turbine AC side energy storage control method for smoothing wind power output power according to an embodiment of the present disclosure;

[0025] Figure 4 It is a schematic diagram of another wind turbine AC side energy storage control method for smoothing wind power output power according to an embodiment of the present disclosure;

[0026] Figure 5 It is a schematic diagram of another wind turbine AC side energy storage control method for smoothing wind power output power according to an embodiment of the present disclosure;

[0027] Figure 6 is a schematic diagram of stabilizing a DC bus voltage through current loop control according to an embodiment of the present disclosure;

[0028] Figure 7 It is a schematic diagram of a calculation process in which the input is the three-phase voltage measured by the power grid and the output is the frequency and phase angle of the power grid according to an embodiment of the present disclosure;

[0029] Figure 8 It is a schematic diagram of a wind turbine AC side energy storage control device for smoothing wind power output power according to an embodiment of the present disclosure;

[0030] Fig. 9 is a schematic diagram of an electronic device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0032] The acquisition, storage, use, and processing of data in the technical solution disclosed in this disclosure are in compliance with the relevant provisions of relevant laws and regulations.

[0033] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned, and they should be considered as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0034] Figure 1 is a schematic diagram of a wind turbine AC side energy storage control method for smoothing wind power output power according to an embodiment of the present disclosure, such as Figure 1 As shown, the wind turbine AC side energy storage control method for smoothing wind power output power includes the following steps:

[0035] S101, obtaining the historical output power of the wind turbine generator set and the SOC value of the electrochemical energy storage device on the AC side of each wind turbine generator set.

[0036] The wind turbine AC side energy storage control method for smoothing wind power output power of the embodiment of the present application can be applied to the scenario of wind farm automation control. The executor of the wind turbine AC side energy storage control for smoothing wind power output power of the embodiment of the present application can be the wind turbine AC side energy storage control device for smoothing wind power output power of the embodiment of the present application. The wind turbine AC side energy storage control device for smoothing wind power output power can be set on an electronic device.

[0037] In the embodiments of the present disclosure, a wind farm may include polymorphic wind turbines, for example, Figure 2 As shown, the wind farm is mainly composed of 1-power generation system (including impeller, rotating chain and generator), 2-converter, 3-box transformer, 4-energy storage system, etc. 2-Converter converts the electric energy generated by the wind turbine into electric energy with the same voltage, frequency and phase as the power grid PCC through AC-DC-AC conversion, mainly including machine-side converter 2-1, DC bus and capacitor 2-2, grid-side converter 2-3, and grid-connected circuit breaker 2-4. 3-The high-voltage side of the box transformer 35kV is connected to the wind farm collection line, and the low-voltage side 690V is connected to 2-converter and 4-energy storage system. 4-Energy storage system is mainly composed of battery system 4-1, inverter 4-2, circuit breaker 4-3, etc. The outlet of circuit breaker 4-3 is connected to the corresponding wind turbine PCC.

[0038] It should be noted that there are many methods for obtaining the historical output power of the wind turbine, which are not limited here. For example, it can be obtained through the historical operation log of the wind turbine, or through a remote monitoring platform.

[0039] S102, determining a charge and discharge restriction condition of the electrochemical energy storage device based on the SOC value.

[0040] In the disclosed embodiment, the charge and discharge limit condition is an important parameter to measure the extreme value of the battery charge and discharge limit, which defines how long the battery can be fully charged or discharged, as well as parameters such as the size of the charge and discharge power. This coefficient has a direct impact on the performance, life and safety of the electrochemical energy storage device. Different operating conditions and different types of electrochemical energy storage devices have different corresponding charge and discharge limit conditions.

[0041] S103, correcting the historical output power based on the charge and discharge restriction condition to determine a first target output power of the wind turbine set and a second target output power of the electrochemical energy storage device in the next period of time.

[0042] In the embodiments of the present disclosure, there may be multiple methods for correcting the historical output power based on the charge and discharge restriction conditions, which are not limited here. For example, the historical output power may be corrected by a preset correction algorithm, which is generated based on the charge and discharge restriction conditions. Optionally, the charge and discharge restriction conditions and the historical output power may be input into the correction model to generate the first target output power of the wind turbine in the next period and the second target output power of the electrochemical energy storage device. The correction model is trained in advance and can be stored in the storage space of the electronic device.

[0043] S104: Smoothly adjust the wind turbine generator set and the electrochemical energy storage device based on the first target output power and the second output power respectively.

[0044] In the disclosed embodiment, the historical output power of the wind turbine and the SOC value of the electrochemical energy storage device on the AC side of each wind turbine are first obtained, and then the charge and discharge restriction conditions of the electrochemical energy storage device are determined based on the SOC value, and then the historical output power is corrected based on the charge and discharge restriction conditions to determine the first target output power of the wind turbine and the second target output power of the electrochemical energy storage device in the next period, and finally the wind turbine and the electrochemical energy storage device are smoothly adjusted based on the first target output power and the second output power. Thus, by setting the charge and discharge restriction conditions, and then correcting the historical output power based on the charge and discharge restriction conditions to adjust the output power of the wind turbine and the electrochemical energy storage device, the stability of wind power output can be greatly improved, the harmonic content can be reduced, and it can be closer to conventional energy, so that wind power can better participate in the dispatching arrangement of the power grid, improve the competitiveness of wind farms in the power market, promote large-scale grid connection and consumption of wind power, improve the control effect of wind farms and the robustness of the system, and at the same time reduce the control cost and increase the life of equipment.

[0045] In the above embodiment, the charge and discharge restriction conditions of the electrochemical energy storage device are determined based on the SOC value. The maximum discharge power and the maximum charge power of the electrochemical energy storage device can be determined based on the SOC value, and the maximum discharge power and the maximum charge power are used as the charge and discharge restriction conditions.

[0046] In the above embodiment, the maximum discharge power and the maximum charge power of the electrochemical energy storage device are determined based on the SOC value, and the maximum discharge power and the maximum charge power of the electrochemical energy storage device are determined based on the SOC value. Figure 3 Explaining further, the method includes:

[0047] S301, obtaining the rated power of the electrochemical energy storage device.

[0048] S302, determining a charge and discharge limit coefficient of the electrochemical energy storage device based on the SOC value.

[0049] In the embodiment of the present disclosure, according to the SOC of each electrochemical energy storage device B,i Determine the charge and discharge limit coefficient K B,i , for example, can be expressed as follows:

[0050]

[0051] Among them, K B_d,i is the discharge coefficient of the electrochemical energy storage device, when The discharge coefficient used for timing; K B_c,i is the charge coefficient of the electrochemical energy storage device, when When it is negative, the charging coefficient is used. It should be noted that a, b, c, d in this formula are pre-designed thresholds for judging power, and e is a constant function. a, b, c, d and e can be changed according to actual design needs, and no limitation is made here. For example, a, b, c, d and e can be 0.1, 0.2, 0.8, 0.9 and 10 respectively.

[0052] S303: multiply the charge and discharge limit coefficient and the rated power to calculate and obtain the maximum discharge power and the maximum charge power of the electrochemical energy storage device.

[0053] In the embodiment of the present disclosure, the formula for calculating the maximum discharge power and the maximum charge power of the electrochemical energy storage device is as follows:

[0054]

[0055] in, is the maximum discharge power of electrochemical energy storage device i in time period j, is the maximum charging power of electrochemical energy storage device i in time period j.

[0056] In the above embodiment, the charge and discharge restriction conditions include the maximum discharge power and the maximum charge power of the electrochemical energy storage device, including modifying the historical output power based on the charge and discharge restriction conditions to determine the first target output power of the wind turbine in the next period and the second target output power of the electrochemical energy storage device, and also by Figure 4 Explaining further, the method includes:

[0057] S401, obtaining the actual output power of the wind turbine generator system.

[0058] S402, calculating an average value based on historical output powers as an initial control power of the electrochemical energy storage device.

[0059] In the embodiment of the present disclosure, after the historical output power is acquired, there may be multiple methods for determining the initial control power based on the historical output power, which are not limited here.

[0060] In one possible implementation, the initial control power can be calculated by taking the average of the historical output power. For example, taking the average output power of the wind turbine in the previous 10 minutes as the initial control power, the calculation can be based on the following formula:

[0061]

[0062] in, P is the power smoothing output reference value of the i-th wind turbine in the j-th time period; W,i(jm) is the average output power of the i-th wind turbine in the jm time period, and each time period corresponds to 1 minute.

[0063] S403, determining a first target output power of the wind turbine generator set and a second target output power of the electrochemical energy storage device for the next period of time based on the actual output power, the initial control power, the maximum discharge power and the maximum charge power.

[0064] In the embodiments of the present disclosure, Figure 5 As shown, in response to the power deviation being greater than or equal to the maximum discharge power and less than or equal to the maximum charging power, the first target output power is determined to be the initial control power, and the second target output power is determined to be the power deviation value, or in response to the power deviation being greater than the maximum charging power, the target downward adjustment coefficient is calculated, and the target downward adjustment value is calculated based on the target downward adjustment coefficient, and the first target output power is determined to be the target downward adjustment value, and the second target output power is determined to be the maximum discharge power of each electrochemical energy storage device in this period, or in response to the power deviation being less than the maximum discharge power, the target upward adjustment coefficient is calculated, and the target upward adjustment value is calculated based on the target upward adjustment coefficient, and the first target output power is determined to be the target upward adjustment value, and the second target output power is determined to be the maximum charging power of each electrochemical energy storage device in this period.

[0065] In the disclosed embodiment, the power smoothing output reference value of each wind turbine set and the charging and discharging of the electrochemical energy storage can be controlled in three states according to the deviation value.

[0066] when , the second power smoothing output reference value of the subsequent timestamp remains unchanged, that is,

[0067]

[0068] The target power of each electrochemical energy storage device for charging and discharging during this control period is the power deviation value, that is,

[0069]

[0070] when When the electrochemical energy storage SOC B,i (j) Calculate its target downward adjustment coefficient.

[0071] In an embodiment of the present disclosure, the target downward adjustment value is calculated based on the first power smoothing output reference value and the target downward adjustment coefficient. The time difference between the target timestamp and the subsequent timestamp can be first calculated, and then the target downward adjustment coefficient is multiplied by the time difference, and the first power smoothing output reference value is subtracted from the product to calculate the target downward adjustment value.

[0072] In the embodiment of the present disclosure, to determine the target downward adjustment value, the smoothed output reference power conversion basic coefficient can be first obtained, and the SOC value of the electrochemical energy storage device can be compared with the first state judgment threshold value. Then, based on the comparison result and the smoothed output reference power conversion basic coefficient, the target downward adjustment coefficient of the electrochemical energy storage device at the target timestamp is determined. Finally, the target downward adjustment value is calculated based on the first power smoothed output reference value and the target downward adjustment coefficient.

[0073] In the embodiment of the present disclosure, the formula for determining the target down-adjustment coefficient is:

[0074]

[0075] Among them, k1(j) is the target down-regulation coefficient of the i-th wind turbine group in the time period of time j, a is a constant function, b is the power judgment threshold, k0 is the basic coefficient of the smooth output reference power conversion, SOC B,i is the SOC value of the electrochemical energy storage device of the i-th wind turbine.

[0076] It should be noted that the constant function a is designed in advance and can be set according to actual control needs, and no limitation is made here. For example, the constant function a can take a value of 50. When the SOC is equal to 0.1, the power smoothing rate increases by 5 times. In this way, the rate of power change can be controlled by controlling the value of the constant function a, thereby achieving different control requirements.

[0077] After obtaining the target reduction coefficient, the target reduction value is calculated based on the first power smoothing output reference value and the target reduction coefficient. The time difference between the target timestamp and the subsequent timestamp is first calculated, and then the target reduction coefficient is multiplied by the time difference, and the first power smoothing output reference value is subtracted from the product to calculate the target reduction value.

[0078] The target downward adjustment value of the subsequent timestamp is calculated using the following formula:

[0079]

[0080] Among them, ΔT is the step length of the control period. The target power of charging and discharging of each electrochemical energy storage device in this control period is the maximum discharge power of each electrochemical energy storage device in this period, as follows:

[0081]

[0082] when To determine the target upward adjustment value, the smoothed output reference power conversion basic coefficient can be first obtained, and the SOC value of the electrochemical energy storage device is compared with the second state judgment threshold value. Then, based on the comparison result and the smoothed output reference power conversion basic coefficient, the target upward adjustment coefficient of the electrochemical energy storage device at the target timestamp is determined. Finally, the target upward adjustment value is calculated based on the first power smoothed output reference value and the target upward adjustment coefficient.

[0083] According to the SOC of each electrochemical energy storage B,i (j) Calculate the target upward adjustment coefficient. The formula for determining the target upward adjustment coefficient is:

[0084]

[0085] Among them, k2(j) is the target upward adjustment coefficient of the i-th wind turbine group in the time period of time j, c is a constant function, d is the power judgment threshold, k0 is the basic coefficient of the smooth output reference power conversion, SOC B,i is the SOC value of the electrochemical energy storage device of the i-th wind turbine.

[0086] After obtaining the target increase coefficient, the target increase value is calculated based on the first power smoothing output reference value and the target increase coefficient. The time difference between the target timestamp and the subsequent timestamp is first calculated, and then the target increase coefficient is multiplied by the time difference, and the first power smoothing output reference value is added to the product to calculate the target increase value.

[0087] The target upward adjustment value of the subsequent timestamp can be calculated using the following formula:

[0088]

[0089] The target power for charging and discharging each electrochemical energy storage device during this control period is the maximum charging power of each electrochemical energy storage device during this period, as follows:

[0090]

[0091] In one embodiment of the present disclosure, each energy storage device uses a grid-based control strategy to track the target power. See also Figure 6 , mainly including a phase-locked loop phase angle calculation module 5, a current outer loop calculation module 6 and a current inner loop calculation module 7.

[0092] The input of the phase-locked loop phase angle calculation module 5 is the three-phase voltage measured by the power grid, and the output is the power grid frequency and phase angle. The calculation process is shown in Figure 7 First, set the initial phase to θ, substitute it into the dq coordinate transformation, and calculate the grid voltage u od and u oq The value is as follows:

[0093]

[0094] will u oq Substitute into the PI formula to calculate the grid frequency. The formula is as follows:

[0095]

[0096] Integrate ω to calculate the grid phase angle, the formula is as follows:

[0097]

[0098] If u oq If it is not close to 0, substitute the calculated phase angle into equations (13) to (16) to recalculate the grid frequency and phase angle until u oq Close to 0, locking the grid frequency and phase angle.

[0099] The current outer loop calculation module 6 includes power calculation 6-1 and PI calculation 6-2. The input of this module is the three-phase voltage u measured by the power grid. oabc , energy storage output three-phase current i abc , Active power reference value Reactive power reference value The output is the energy storage PCC point dq axis current control target value i dq * First, the three-phase voltage u measured by the power grid is converted into oabc , three-phase current i abc Convert to u odq and i dq , and then substitute it into the following formula to calculate the grid measured active power P B,i and reactive Q B,i .

[0100]

[0101] Then P B,i , Q B,i , and Substitute into the PI formula to calculate the dq axis current control target value i at the energy storage PCC point dq * , the formula is as follows:

[0102]

[0103] The current inner loop calculation module 7 includes PI calculations 7-1 and 7-2, dq coordinate transformation 7-3 and dq coordinate inverse transformation 7-4. First, the inverter output three-phase current measurement value i abc Converted into dq axis current i through dq transformation dq Then, the voltage value corresponding to the current loop is calculated by PI, and the formula is as follows:

[0104]

[0105] Afterwards, the inverter dq axis voltage control target value is obtained by introducing the dq axis cross-influence term, and the formula is as follows:

[0106]

[0107] Finally, the inverter dq axis voltage control target value u dq * Substitute the dq coordinate inverse transformation to calculate the inverter modulation voltage control target value u abc * , the formula is as follows:

[0108]

[0109] Corresponding to the wind turbine AC side energy storage control method for smoothing wind power output power provided in the above-mentioned embodiments, an embodiment of the present disclosure further provides a wind turbine AC side energy storage control device for smoothing wind power output power. Since the wind turbine AC side energy storage control device for smoothing wind power output power provided in the embodiment of the present disclosure corresponds to the wind turbine AC side energy storage control method for smoothing wind power output power provided in the above-mentioned embodiments, the implementation method of the above-mentioned wind turbine AC side energy storage control method for smoothing wind power output power is also applicable to the wind turbine AC side energy storage control device for smoothing wind power output power provided in the embodiment of the present disclosure, and will not be described in detail in the following embodiments.

[0110] Figure 8 Schematic diagram of a wind turbine AC side energy storage control device for smoothing wind power output power according to an embodiment of the present disclosure, such as Figure 8 As shown, the wind turbine AC side energy storage control device 800 for smoothing wind power output power includes: an acquisition module 810, a determination module 820, a correction module 830 and an adjustment module 840.

[0111] The acquisition module 810 is used to acquire the historical output power of the wind turbine generator set and the SOC value of the electrochemical energy storage device on the AC side of each wind turbine generator set.

[0112] The determination module 820 is used to determine the charge and discharge restriction conditions of the electrochemical energy storage device based on the SOC value.

[0113] The correction module 830 is used to correct the historical output power based on the charge and discharge restriction conditions to determine the first target output power of the wind turbine set and the second target output power of the electrochemical energy storage device in the next period.

[0114] The adjustment module 840 is used to smoothly adjust the wind turbine set and the electrochemical energy storage device based on the first target output power and the second output power respectively.

[0115] According to one embodiment of the present disclosure, determining the charge and discharge restriction conditions of the electrochemical energy storage device based on the SOC value includes: determining the maximum discharge power and the maximum charge power of the electrochemical energy storage device based on the SOC value, and using the maximum discharge power and the maximum charge power as the charge and discharge restriction conditions.

[0116] According to one embodiment of the present disclosure, the maximum discharge power and the maximum charge power of the electrochemical energy storage device are determined based on the SOC value, including: obtaining the rated power of the electrochemical energy storage device; determining the charge and discharge limit coefficient of the electrochemical energy storage device based on the SOC value; and multiplying the charge and discharge limit coefficient and the rated power to calculate the maximum discharge power and the maximum charge power of the electrochemical energy storage device.

[0117] According to one embodiment of the present disclosure, the charge and discharge restriction conditions include the maximum discharge power and the maximum charging power of the electrochemical energy storage device, including correcting the historical output power based on the charge and discharge restriction conditions to determine the first target output power of the wind turbine in the next time period and the second target output power of the electrochemical energy storage device, including: obtaining the actual output power of the wind turbine; calculating the average value based on the historical output power as the initial control power of the electrochemical energy storage device; determining the first target output power of the wind turbine in the next time period and the second target output power of the electrochemical energy storage device based on the actual output power, the initial control power, the maximum discharge power and the maximum charging power.

[0118] According to one embodiment of the present disclosure, based on the actual output power, the initial control power, the maximum discharge power and the maximum charging power, the first target output power of the wind turbine in the next time period and the second target output power of the electrochemical energy storage device are determined, including: subtracting the actual output power from the initial control power to calculate the power deviation; comparing the power deviation with the maximum discharge power and the maximum charging power, and determining the first target output power and the second target output power based on the comparison result.

[0119] According to one embodiment of the present disclosure, determining the first target output power and the second target output power based on the comparison result includes: in response to the power deviation being greater than or equal to the maximum discharge power and less than or equal to the maximum charging power, determining the first target output power as the initial control power and the second target output power as the power deviation value; or, in response to the power deviation being greater than the maximum charging power, calculating the target downward adjustment coefficient, and calculating the target downward adjustment value based on the target downward adjustment coefficient, determining the first target output power as the target downward adjustment value, and the second target output power as the maximum discharge power of each electrochemical energy storage device in this time period; or, in response to the power deviation being less than the maximum discharge power, calculating the target upward adjustment coefficient, and calculating the target upward adjustment value based on the target upward adjustment coefficient, determining the first target output power as the target upward adjustment value, and the second target output power as the maximum charging power of each electrochemical energy storage device in this time period.

[0120] According to an embodiment of the present disclosure, the method further includes: controlling the wind turbine converter side by an optimal power control strategy.

[0121] By setting charge and discharge limit conditions, and then correcting the historical output power based on the charge and discharge limit conditions to adjust the output power of wind turbines and electrochemical energy storage devices, the stability of wind power output can be greatly improved, and the harmonic content can be reduced, making it closer to conventional energy. This will enable wind power to better participate in the dispatch of the power grid, improve the competitiveness of wind farms in the power market, promote large-scale grid connection and consumption of wind power, improve the management and control of wind farms and the robustness of the system, and at the same time reduce management and control costs and increase equipment life.

[0122] In order to implement the above embodiment, the present disclosure further provides an electronic device 900, Fig. 9 is a schematic diagram of an electronic device according to an embodiment of the present disclosure, such as Fig. 9 As shown, the electronic device 900 includes: a processor 901 and a memory 902 that is communicatively connected to the processor, the memory 902 stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor 901 to implement the present disclosure. Figure 1-Figure 7 The embodiment provides a wind turbine AC side energy storage control method for smoothing wind power output power.

[0123] In order to implement the above embodiments, the present disclosure also provides a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable the computer to implement the above embodiments. Figure 1-Figure 7 The embodiment provides a wind turbine AC side energy storage control method for smoothing wind power output power.

[0124] In order to implement the above embodiments, the present disclosure also provides a computer program product, including a computer program. When the computer program is executed by a processor, the computer program implements the above embodiments. Figure 1-Figure 7 The embodiment provides a wind turbine AC side energy storage control method for smoothing wind power output power.

[0125] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0126] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that contains, stores, communicates, propagates or transmits a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0131] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0132] 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.

[0133] 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.

[0134] 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 method for controlling AC side energy storage of a wind turbine for smoothing wind power output, characterized in that: include: Obtain the historical output power of the wind turbines and the SOC value of the electrochemical energy storage device on the AC side of each wind turbine; Determining a charge and discharge restriction condition of the electrochemical energy storage device based on the SOC value; Correcting the historical output power based on the charge and discharge restriction condition to determine a first target output power of the wind turbine set and a second target output power of the electrochemical energy storage device in the next period of time; The wind turbine generator set and the electrochemical energy storage device are smoothly adjusted based on the first target output power and the second output power respectively.

2. The method according to claim 1, characterized in that The determining of the charge and discharge restriction condition of the electrochemical energy storage device based on the SOC value includes: The maximum discharge power and the maximum charge power of the electrochemical energy storage device are determined based on the SOC value, and the maximum discharge power and the maximum charge power are used as the charge and discharge restriction conditions.

3. The method according to claim 2, characterized in that The determining the maximum discharge power and the maximum charge power of the electrochemical energy storage device based on the SOC value includes: Obtaining the rated power of the electrochemical energy storage device; Determining a charge and discharge limitation coefficient of the electrochemical energy storage device based on the SOC value; The charge and discharge limit coefficient is multiplied by the rated power to calculate and obtain the maximum discharge power and the maximum charge power of the electrochemical energy storage device.

4. The method according to claim 2 or 3, characterized in that: The charge and discharge restriction condition includes the maximum discharge power and the maximum charge power of the electrochemical energy storage device, and the correction of the historical output power based on the charge and discharge restriction condition to determine the first target output power of the wind turbine in the next period and the second target output power of the electrochemical energy storage device includes: Obtaining the actual output power of the wind turbine generator set; Calculate an average value based on the historical output power as the initial control power of the electrochemical energy storage device; Based on the actual output power, the initial control power, the maximum discharge power and the maximum charge power, a first target output power of the wind turbine set in the next time period and a second target output power of the electrochemical energy storage device are determined.

5. The method according to claim 4, characterized in that The determining, based on the actual output power, the initial control power, the maximum discharge power and the maximum charge power, of the first target output power of the wind turbine set in the next period and the second target output power of the electrochemical energy storage device comprises: Subtracting the actual output power from the initial control power to calculate a power deviation; The power deviation is compared with the maximum discharge power and the maximum charge power, and the first target output power and the second target output power are determined based on the comparison result.

6. The method according to claim 5, characterized in that The determining the first target output power and the second target output power based on the comparison result includes: In response to the power deviation being greater than or equal to the maximum discharge power and less than or equal to the maximum charge power, determining the first target output power as the initial control power and the second target output power as the power deviation value; or, In response to the power deviation being greater than the maximum charging power, a target reduction coefficient is calculated, and a target reduction value is calculated based on the target reduction coefficient, and the first target output power is determined to be the target reduction value, and the second target output power is determined to be the maximum discharge power of each electrochemical energy storage device in this time period; or, In response to the power deviation being less than the maximum discharge power, a target increase coefficient is calculated, and a target increase value is calculated based on the target increase coefficient, and the first target output power is determined to be the target increase value, and the second target output power is determined to be the maximum charging power of each electrochemical energy storage device in this time period.

7. The method according to claim 1, characterized in that The method further comprises: The wind turbine converter side is controlled by an optimal power control strategy.

8. A wind turbine AC side energy storage control device for smoothing wind power output power, characterized in that: include: An acquisition module is used to obtain the historical output power of the wind turbine and the SOC value of the electrochemical energy storage device on the AC side of each wind turbine; A determination module, configured to determine a charge and discharge restriction condition of the electrochemical energy storage device based on the SOC value; A correction module, used to correct the historical output power based on the charge and discharge restriction condition to determine a first target output power of the wind turbine set and a second target output power of the electrochemical energy storage device in a next period of time; An adjustment module is used to smoothly adjust the wind turbine set and the electrochemical energy storage device based on the first target output power and the second output power respectively.

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

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

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