Power distribution control method suitable for wind storage combined system

Abstract

The invention discloses a power distribution control method suitable for a wind storage combined system, and the method comprises the steps: obtaining a power balance parameter, the charge state of a battery and the charge state of a supercapacitor according to the system operation parameters of the wind storage combined system in the operation process, and obtaining the charge state of the supercapacitor according to the power balance parameter; the method comprises the following steps: determining a power balance relationship of the wind storage combined system, further determining an operation mode of the wind storage combined system according to an operation mode selected by the wind storage combined system, obtaining reference currents of a battery and a supercapacitor in a corresponding operation mode, and determining the power balance of the wind storage combined system according to the reference currents of the battery and the supercapacitor. And performing power distribution control on the wind storage combined system according to a preset power distribution control strategy. The residual electric quantity of the super capacitor is introduced as a new constraint, and the residual electric quantity and the residual electric quantity of the battery system jointly determine power distribution control, so that the hybrid energy storage system is protected while stable operation of the wind power generation system is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of grid-connected hybrid energy storage systems, and particularly to a power distribution control method applicable to a wind-storage combined system. Background Art

[0002] Renewable energy generation is affected by seasons and daily variations and has the characteristic of intermittency. Energy storage systems can improve the operational reliability of the system by providing uninterrupted power to loads. Traditional fossil fuel power plants provide inertial response by large synchronous motors to maintain the stability of the grid frequency. However, as renewable energy continuously replaces traditional fossil energy, synchronous generators are gradually replaced, resulting in a reduction in grid inertia and relying on energy storage systems to alleviate the differences between the power generation side and the demand side.

[0003] Compared with other forms of energy storage technologies, battery energy storage has diverse control characteristics and rich integration methods, and is widely used in improving the frequency regulation and peak shaving performance of the power grid, stabilizing the grid voltage, optimizing the access of distributed power sources, etc. However, battery energy storage systems face challenges such as rapid degradation of the battery health state caused by low power density and high charge / discharge utilization rate. Therefore, in application scenarios involving frequent high-speed charging and discharging, additional control methods are required to handle surge currents. Supercapacitors have a high power density but a low energy density compared to batteries and are suitable for transient power support. A hybrid energy storage system combining the advantages of energy storage batteries and supercapacitors has the advantage of improving the overall operating efficiency of the power system.

[0004] The operation of a hybrid energy storage system depends on a distribution control strategy that coordinates the operation of the system to effectively regulate the power flow and give full play to the respective advantages of the energy storage battery and the supercapacitor. Power distribution control strategies can generally be divided into two categories: control strategies based on logical rules such as filtering, deadbeat, sliding mode, droop, and fuzzy control. The filtering-based control method can distinguish the high-frequency and low-frequency components of the hybrid energy storage system and is the simplest and most feasible. However, in the process of designing filter parameters, two factors, namely the time constant and the control bandwidth, should be considered. Another category is control strategies based on optimization methods, which can be divided into offline methods and online methods. These methods all require a large amount of data storage, precise data training, and complex calculations. Wind power generation systems involve dynamic processes and power fluctuations caused by changes in wind speed, and the system is complex with more factors to be considered. Although the power management control problem of wind power generation systems can be solved by filtering control, and there are already methods that consider the remaining battery charge (%SOC) during transient operation and thus formulate a coordinated power distribution control strategy, since the remaining charge (%SOC) of the supercapacitor is not considered, complete protection of the hybrid energy storage system cannot be achieved.

[0005] Therefore, it has become an urgent problem for those skilled in the art to derive a power separate control method that simultaneously takes into account the remaining power constraints of the battery and the supercapacitor. Summary of the Invention

[0006] Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a power distribution control method applicable to a wind energy storage combined system. By introducing the remaining power of the supercapacitor as a new constraint, together with the remaining power of the battery system, it determines the power distribution control, ensuring the stable operation of the wind power generation system while protecting the hybrid energy storage system.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A power distribution control method applicable to a wind energy storage combined system includes the following steps:

[0009] S1. Obtain the system operation parameters during the operation of the wind energy storage combined system, where the system operation parameters include the DC bus voltage and current, AC voltage, battery voltage and current, supercapacitor voltage and current, and load current;

[0010] S2. According to the system operation parameters, calculate the power balance parameter, the state of charge SOC of the battery B and the state of charge SOC of the supercapacitor SC , and determine the power balance relationship of the wind energy storage combined system according to the power balance parameter;

[0011] S3. According to the power balance relationship of the wind energy storage combined system, obtain the total current i required to adjust the total DC bus voltage net , and select the operation mode according to the state of charge SOC of the battery B and the state of charge SOC of the supercapacitor SC , including the power distribution operation mode, the battery single operation mode, and the extreme operation mode;

[0012] S4. According to the selected operation mode of the wind energy storage combined system, obtain the reference currents of the battery and the supercapacitor in the corresponding operation mode, and thus, according to the reference currents of the battery and the supercapacitor, perform power distribution control on the wind energy storage combined system according to a preset power distribution control strategy.

[0013] As a preferred solution, in step S2, the formulas for calculating the state of charge SOC of the battery B and the state of charge SOC of the supercapacitor SC are:

[0014]

[0015] where SOCB (t 0 ) represents the initial state of charge of the battery, η b represents the Coulomb efficiency of the battery, C NB represents the rated capacity of the battery, i B represents the current of the battery, SOC SC (t 0 ) represents the initial state of charge of the supercapacitor, η sc represents the Coulomb efficiency of the supercapacitor, C NSC represents the rated capacity of the supercapacitor, i SC represents the current of the supercapacitor.

[0016] As a preferred solution, in step S2, the expression of the power balance relationship is as follows:

[0017] P net (t) = P w (t) - P load (t) - P loss (t);

[0018] In the formula, P net (t) represents the total power required to adjust the DC bus voltage, P w (t) represents the power output by the fan, P load (t) represents the power required by the load, P loss (t) represents the power loss in the system.

[0019] As a preferred solution, in step S3, the selection of the operation mode specifically includes:

[0020] The power distribution operation mode: When the total current i required to adjust the total DC bus voltage net > 0, SOC SC < SOC SC_MAX and SOC B < SOC B_MAX , in the power distribution operation mode, the wind - storage combined system charges until the state of charge reaches the maximum value; when the total current i required to adjust the total DC bus voltage net ≤0, SOC SC > SOC SC_MIN and SOC B > SOC B_MIN , in the power distribution operation mode, the wind - storage combined system discharges to meet the power P required by the load load ;

[0021] The battery single - operation mode: When the total current i required to adjust the total DC bus voltage net > 0, SOC B < SOC B_Highand SOC SC >SOC SC_MAX , the battery is charged separately and the supercapacitor is discharged to meet the power P required by the load load ; the total current i required to regulate the total DC bus voltage net ≤0, SOC B >SOC B_Low and SOC SC <SOC SC_MIN , the battery discharges alone and the remaining capacity of the battery is used to charge the supercapacitor;

[0022] The described extreme operation mode: when the total current i required to regulate the total DC bus voltage net >0 or i net ≤0, SOC SC >SOC SC_MAX and SOC B >SOC B_MAX , the wind-solar-storage combined system is locked to avoid overcharging, and the fan is switched to the low-power operation state.

[0023] As a preferred solution, in step S4, the reference currents of the battery and the supercapacitor in the corresponding operation mode specifically include:

[0024] The power distribution operation mode:

[0025]

[0026] In the formula, i B_ref represents the reference current of the battery, i SC_ref represents the reference current of the supercapacitor, i avg represents the average current value within a certain period of time, i tra represents the transient current;

[0027] The battery-alone operation mode:

[0028]

[0029] In the formula, i SC,rat_ch represents the rated charging current of the supercapacitor, i SC,rat_dch represents the rated discharging current of the supercapacitor;

[0030] The extreme motion mode:

[0031] i B_ref =0, i SC_ref =0.

[0032] As a preferred solution, in step S4, the rule for power distribution control of the wind-solar-storage combined system is:

[0033] Power distribution operation mode:

[0034] P load = P w -(P bat + P sc ), i net > 0;

[0035] P load = P w +(P bat + P sc ), i net ≤0;

[0036] In the formula, P bat represents the charge and discharge power of the battery;

[0037] Battery single operation mode:

[0038] P load = P w - P bat , i net > 0;

[0039] P load = P w + P bat , i net ≤0;

[0040] Limit operation mode:

[0041] P load,NLM = P w,rmp , i net > 0;

[0042] P load,shed = P w,rmp , i net ≤0;

[0043] In the formula, P load,NLM represents the power required by the load in the limit operation mode, P load,shed represents the load power that needs to be weakened, P w,rmp represents the rated power of the wind turbine at the rated maximum wind speed.

[0044] Compared with the prior art, the present invention has the following technical effects:

[0045] (1) By monitoring and adjusting the charge and discharge states of the battery and the supercapacitor in real time, the present invention ensures the stable operation of the wind power generation system under various operating conditions. This method optimizes energy utilization and prevents damage to the energy storage device due to overcharging or over-discharging, thereby extending the service life of the device.

[0046] (2) By considering the remaining power (SOC) of the battery and the supercapacitor as new constraints, the present invention expands two new operating modes, namely the battery-alone operating mode and the extreme operating mode. These two modes effectively solve the protection problems of the battery and the supercapacitor under extreme conditions. When necessary, the wind turbine can seamlessly switch to the low-power mode to avoid system overload or equipment damage.

[0047] (3) The power distribution control method proposed by the present invention can ensure stable operation in various operating modes while realizing seamless switching among three operating modes (power distribution operating mode, battery-alone operating mode, and extreme operating mode). At the same time, in order to prevent overcharging and discharging of the hybrid energy storage system when the battery operates alone, the SOC threshold of the supercapacitor is added as a new constraint. In this case, the supercapacitor charges and discharges at a constant current until the SOC threshold is reached, thus achieving faster recovery and smooth mode switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to make the objectives, technical solutions, and advantages of the invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings, where:

[0049] Figure 1 is a flowchart of a power distribution control method applicable to a wind energy storage combined system disclosed by the present invention;

[0050] Figure 2 is the flowchart of the power distribution control method in Embodiment i net ≤0;

[0051] Figure 3 is the flowchart of the power distribution control method in Embodiment i net >0. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0053] The present invention will be further described in detail below with reference to the accompanying drawings.

[0054] Existing wind power generation systems often lead to grid frequency fluctuations and voltage instability due to the intermittency and instability of wind power. For battery energy storage systems, they face problems such as rapid degradation caused by low power density and high charge-discharge utilization rate. In addition, the existing technologies are relatively complex in energy management, requiring a large amount of data storage, precise data training, and complex calculations, and cannot effectively protect batteries and supercapacitors from overcharging or over-discharging under extreme conditions. These problems limit the performance and reliability of the wind-storage combined system. In view of the above problems and deficiencies, the present invention ensures the stable operation of the wind power generation system under various operating conditions by real-time monitoring and adjusting the charge-discharge states of the battery and the supercapacitor, optimizes energy utilization, and prevents the energy storage device from overcharging or over-discharging, thereby extending the device life. The present invention introduces a battery-alone operation mode and an extreme operation mode, effectively solving the protection problems of the battery and the supercapacitor under extreme conditions. In addition, the present invention realizes seamless switching among three working modes (power distribution operation mode, battery-alone operation mode, and extreme operation mode), simplifies the control strategy, improves the response speed and efficiency of the system, and enhances the compatibility with the power grid.

[0055] Therefore, the present invention proposes a power distribution control method applicable to a wind-storage combined system. This method first determines the operating mode of the wind power generation system by taking the power transmission direction, the remaining battery capacity of the battery system, and the remaining battery capacity of the supercapacitor as constraints. Then, according to the operating mode, it determines the operating state of the wind turbine and the reference currents of the battery system, the supercapacitor, and the converter.

[0056] Specifically, as Figure 1 shown, the method of the present invention includes the following steps:

[0057] S1. Obtain the system operating parameters during the operation of the wind-storage combined system. The system operating parameters include the DC bus voltage and current, the AC voltage, the battery voltage and current, the supercapacitor voltage and current, and the load current;

[0058] S2. According to the system operating parameters, calculate the power balance parameter, the state of charge SOC B of the battery and the state of charge SOC SC of the supercapacitor, and determine the power balance relationship of the wind-storage combined system according to the power balance parameter;

[0059] S3. According to the power balance relationship of the wind-storage combined system, obtain the total current i net required to adjust the total DC bus voltage, and select the operating mode according to the state of charge SOC B of the battery and the state of charge SOC SC of the supercapacitor, including the power distribution operation mode, the battery-alone operation mode, and the extreme operation mode;

[0060] S4. According to the selected operation mode of the wind-storage combined system, obtain the reference currents of the battery and the supercapacitor under the corresponding operation mode, and calculate the reference current of the converter according to the reference currents of the battery and the supercapacitor, so as to complete the power distribution control of the wind-storage combined system.

[0061] In the present invention, it is possible to ensure the stable operation of the wind-storage combined system under various operating conditions, realize seamless switching between different working modes, optimize energy utilization, prevent over-discharge or over-charge of energy storage devices, improve the response speed and efficiency of the system, and thus improve the overall reliability and economy.

[0062] In this specific embodiment, for step S2, the control objective of the power distribution control strategy is to achieve the voltage stability at the DC bus, while ensuring the power balance between the wind turbine and the load, and effectively managing the charge and discharge of the hybrid energy storage system. In the microgrid system, the power balance method is: P net (t) = P w (t) - P load (t) - P loss (t);

[0063] In the formula, P net (t) represents the total power required to regulate the DC bus voltage, P w (t) represents the power output by the wind turbine, P load (t) represents the power required by the load, P loss (t) represents the power loss in the system.

[0064] Correspondingly, the state of charge SOC B of the battery and the state of charge SOC SC of the supercapacitor are given by the formulas:

[0065]

[0066] In the formula, SOC B (t 0 ) represents the initial state of charge of the battery, η b represents the Coulomb efficiency of the battery, C NB represents the rated capacity of the battery, i B represents the current of the battery, SOC SC (t 0 ) represents the initial state of charge of the supercapacitor, η sc represents the Coulomb efficiency of the supercapacitor, C NSC represents the rated capacity of the supercapacitor, i SC represents the current of the supercapacitor.

[0067] In this specific embodiment, the total current \(i\) required to regulate the total DC bus voltage is obtained according to the power balance relationship of the wind-storage combined system net , and the operating mode of the wind-storage combined system is determined according to the remaining charge (SOC) of the battery and the supercapacitor. The following details three operating modes of the wind-storage combined system, including the power distribution operating mode, the battery-alone operating mode, and the extreme operating mode, as shown in Figure 2 , Figure 3 .

[0068] 1) The power distribution operating mode: In this mode, the hybrid energy storage system performs charge and discharge operations according to the difference between wind power generation and the load side demand. In addition, the wind power generation system operates at the optimal power state while the nominal load is applied to the DC bus. For the state of excessive power generation (i.e., \(P\) w \(>P\) load ), when the total current \(i\) required to regulate the total DC bus voltage net \(>0\), \(SOC\) SC \(<SOC\) SC_MAX and \(SOC\) B \(<SOC\) B_MAX , the wind-storage combined system charges in the power distribution operating mode until the state of charge reaches the maximum value; in the state of power shortage, when the total current \(i\) required to regulate the total DC bus voltage net \(\leq0\), \(SOC\) SC \(>SOC\) SC_MIN and \(SOC\) B \(>SOC\) B_MIN , the wind-storage combined system discharges in the power distribution operating mode to meet the required power \(P\) load , until the operating state changes or the minimum value of the state of charge is reached. In these two states, \(i\) net is distributed by the battery and the supercapacitor, and is mainly controlled by the battery in the steady state and by the supercapacitor in the transient state.

[0069] In this operating mode, the reference current output results of the battery and the supercapacitor are as follows:

[0070]

[0071] In the formula, \(i\) B_ref represents the reference current of the battery, \(i\) SC_ref represents the reference current of the supercapacitor, \(i\) avg represents the average current value within a certain period of time, and \(i\) tra represents the transient current.

[0072] Therefore, the power distribution control rule for the wind-storage combined system in this operating mode is:

[0073] \(P\)load = P w - (P bat + P sc ), i net > 0;

[0074] P load = P w + (P bat + P sc ), i net ≤ 0;

[0075] Wherein, P bat represents the charge and discharge power of the battery.

[0076] 2) The separate operation mode of the battery: In this mode, for the state of excessive power generation, when the total current i net > 0 required to adjust the total DC bus voltage, SOC B < SOC B_High and SOC SC > SOC SC_MAX , the battery is charged separately, and the supercapacitor discharges at the rated current to meet the required power P load . In this case, the battery works alone to absorb or provide the system power and the required power of the supercapacitor. The fan operates at the maximum power point, and the load operates in the nominal state, which means that the supercapacitor responds to the transient power demand, while the battery responds to the steady-state power demand; for the state of power shortage, when the total current i net ≤ 0 required to adjust the total DC bus voltage, SOC B > SOC B_Low and SOC SC < SOC SC_MIN , the battery discharges separately, and the remaining capacity of the battery is used to charge the supercapacitor. In this case, the battery works alone to absorb or provide the system power and the required power of the supercapacitor. The fan operates at the maximum power point, and the load operates in the nominal state, which means that the supercapacitor is being charged for subsequent power demands;

[0077] In this operating mode, the reference current output results of the battery and the supercapacitor are as follows:

[0078]

[0079] Wherein, i SC,rat_ch represents the rated charging current of the supercapacitor, and i SC,rat_dch represents the rated discharge current of the supercapacitor;

[0080] Therefore, the power distribution control rule for the wind-storage combined system in this operating mode is:

[0081] Pload = P w - P bat , i net > 0;

[0082] P load = P w + P bat , i net ≤ 0。

[0083] 3) The limit operation mode: In this operation mode, when the total current i required to adjust the total DC bus voltage net > 0 or i net ≤ 0, SOC SC > SOC SC_MAX and SOC B > SOC B_MAX , the wind - storage combined system is locked to avoid over - charging, and the wind turbine is switched to the low - power operation state;

[0084] In this operation mode, the reference current output results of the battery and the supercapacitor are as follows:

[0085] i B_ref = 0, i SC_ref = 0。

[0086] Thus, the rule for power distribution control of the wind - storage combined system in this operation mode is:

[0087] P load,NLM = P w,rmp , i net > 0;

[0088] P load,shed = P w,rmp , i net ≤ 0;

[0089] In the formula, P load,NLM represents the power required by the load in the limit operation mode, P load,shed represents the load power to be weakened, and P w,rmp represents the rated power of the wind turbine at the rated maximum wind speed.

[0090] After obtaining the reference currents of the battery and the supercapacitor, the switching tube control signals can be given according to the pre - formulated coordinated power distribution control strategy, and then, in cooperation with the DC / DC converter, the power distribution control of the wind - storage combined system can be carried out to achieve the protection of the hybrid energy storage system.

[0091] In summary, the power distribution control method proposed in this embodiment introduces the remaining power of the supercapacitor as a new constraint, and together with the remaining power of the battery system, determines the power distribution control strategy, so as to effectively complete power calculation, generation of reference current, and selection of operating modes. The wind turbine can operate in the optimal operating condition under different operating constraint conditions, and can smoothly transition and seamlessly switch between different operating modes.

[0092] By precisely controlling the charge and discharge states of the battery and the supercapacitor, this embodiment can prevent the energy storage device from being overcharged or over-discharged, and extend its service life. At the same time, this method dynamically adjusts the operating mode of the wind turbine by real-time monitoring of the system operating parameters and state of charge to adapt to the fluctuations of wind power generation and changes in load demands, ensuring that the system always operates in a safe and efficient state.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described by referring to the preferred embodiments of the present invention, those of ordinary skill in the art should understand that various changes can be made in form and details without departing from the spirit and scope of the present invention defined by the appended claims.

Claims

1. A power distribution control method applicable to a wind-storage combined system, characterized in that: The steps include: S1. Obtaining system operating parameters of the wind-storage combined system during operation, wherein the system operating parameters include DC bus voltage and current, AC voltage, battery voltage and current, supercapacitor voltage and current, and load current; S2. Calculate the power balance parameter and the battery state of charge SOC according to the system operation parameters. B The state of charge SOC of the supercapacitor SC , and determine the power balance relationship of the wind-storage combined system according to the power balance parameters; S3. According to the power balance relationship of the wind-storage combined system, the total current i required to adjust the total voltage of the DC bus is obtained. net , and according to the battery state of charge SOC B The state of charge SOC of the supercapacitor SC Select the operation mode, including power distribution operation mode, battery operation mode and extreme operation mode; S4. According to the operating mode selected by the wind-storage combined system, the reference current of the battery and the supercapacitor in the corresponding operating mode is obtained, so as to perform power distribution control on the wind-storage combined system according to the reference current of the battery and the supercapacitor and the preset power distribution control strategy.

2. The power distribution control method applicable to the wind-storage combined system according to claim 1 is characterized in that: In step S2, the state of charge (SOC) of the battery is calculated. B The state of charge SOC of the supercapacitor SC The formula is: In the formula, SOC B (t0) represents the initial state of charge of the battery, η b Indicates the coulombic efficiency of the battery, C NB Indicates the rated capacity of the battery, i B Indicates the battery current, SOC SC (t0) represents the initial charge state of the supercapacitor, η sc The Coulombic efficiency of the supercapacitor, C NSC Represents the rated capacity of the supercapacitor, i SC Represents the current of the supercapacitor.

3. The power distribution control method applicable to the wind-storage combined system according to claim 1 is characterized in that: In step S2, the expression of the power balance relationship is as follows: P net (t)=P w (t)-P load (t)-P loss (t); Where P net (t) represents the total power required to regulate the DC bus voltage, P w (t) represents the power output of the fan, P load (t) represents the power required by the load, P loss (t) represents the power loss in the system.

4. The power distribution control method applicable to the wind-storage combined system according to claim 1 is characterized in that: In step S3, the selection of the operation mode specifically includes: The power distribution operation mode: when the total current i required to adjust the total voltage of the DC bus is net >0, SOC SC <SOC SC_MAX and SOC B <SOC B_MAX , in the power distribution operation mode, the wind-storage combined system is charged until the state of charge reaches the maximum value; when the total current i required to adjust the total DC bus voltage net When ≤0, SOC SC >SOC SC_MIN and SOC B >SOC B_MIN , in the power distribution operation mode, the wind-storage combined system discharges to meet the load power P load ; The battery single operation mode: when the total current i required to adjust the total voltage of the DC bus net >0, SOC B <SOC B_High and SOC SC >SOC SC_MAX , the battery is charged separately, and the supercapacitor is discharged to meet the power P required by the load load ;Total current i required to adjust the total voltage of DC bus net When ≤0, SOC B >SOC B_Low and SOC SC <SOC SC_MIN , the battery is discharged alone, and the remaining capacity of the battery is used to charge the supercapacitor; The limit operation mode: when the total current i required to adjust the total voltage of the DC bus net >0 or i net When ≤0, SOC SC >SOC SC_MAX and SOC B >SOC B_MAX , the wind-storage combined system is locked to avoid overcharging, and the wind turbine is switched to low-power operation.

5. The power distribution control method applicable to the wind-storage combined system according to claim 1 is characterized in that: In step S4, the reference current of the battery and the supercapacitor in the corresponding operation mode specifically includes: The power distribution operation mode: In the formula, i B_ref Represents the reference current of the battery, i SC_ref represents the reference current of the supercapacitor, i avg Indicates the average current value within a certain period of time, i tra Indicates transient current; The battery alone operation mode: In the formula, i SC,rat_ch Indicates the rated charging current of the supercapacitor, i SC,rat_dch Indicates the rated discharge current of the supercapacitor; The extreme sports mode: i B_ref =0,i SC_ref =0。 6. The power distribution control method applicable to the wind-storage combined system according to claim 1 is characterized in that: In step S4, the power allocation control rule for the wind-storage combined system is: Power distribution operation mode: P load =P w -(P bat +P sc ),i net >0; P load =P w +(P bat +P sc ),i net ≤0; Where P bat Indicates the charging and discharging power of the battery; Battery operation mode: P load =P w -P bat ,i net >0; P load =P w +P bat ,i net ≤0; Extreme operating mode: P load,NLM =P w,rmp ,i net >0; P load,shed =P w,rmp ,i net ≤0; Where P load,NLM Indicates the power required by the load in the extreme operation mode, P load,shed Indicates the load power that needs to be reduced, P w,rmp Indicates the rated power of the fan at the rated maximum wind speed.

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