Energy storage system smoothing control method, device, equipment and storage medium

Abstract

The present invention relates to a smooth control method, device, equipment and storage medium for an energy storage system. The method includes: collecting current data of a wind-solar-storage combined power station, where the current data includes relevant data of the wind-solar power station and the state of charge of the battery of the energy storage system; calculating the current wind-solar fluctuation change value of the wind-solar-storage combined power station according to the relevant data of the wind-solar power station; comparing the wind-solar fluctuation change value with a first limit value to determine whether smooth control of the energy storage system is required, where the first limit value is calculated according to the relevant data of the wind-solar power station and a first preset threshold; in the case of determining that smooth control of the energy storage system is required, determining a control mode for the energy storage system according to the state of charge of the battery, and performing smooth control on the energy storage system under the control mode. The method provided by this application effectively reduces the charge-discharge cycle of the energy storage system, extends the life of the energy storage system, and at the same time realizes grid friendliness.

Description

Technical Field

[0001] The present invention relates to the technical field of energy utilization, and particularly to a method, device, equipment and storage medium for smooth control of an energy storage system. Background Art

[0002] As a renewable and pollution-free energy source, wind power generation and photovoltaic power generation have received worldwide attention in recent years and have been vigorously developed. However, due to the influence of factors such as weather and geography, the magnitude and direction of wind speed often change, and the photovoltaic output is also closely related to weather changes. The changes in light intensity and temperature will affect the magnitude of the output, resulting in great randomness, volatility and intermittency of wind power and photovoltaic output. The characteristics of wind and light output such as randomness, volatility and intermittency have an increasing impact on the safe and stable operation of the power system, greatly reducing the original power quality.

[0003] Therefore, it is necessary for the energy storage system to participate in the operation of the power system for smoothing. In the current related technologies of the energy storage system participating in smooth control, most of them are that the energy storage system participates in smooth control throughout the process, which is extremely easy to cause the energy storage system to over-participate in the control of suppressing wind and light fluctuations, not only shortening the life of the energy storage system, but also having an impact on the whole station volatility when the energy storage system exits smooth control. Summary of the Invention

[0004] In order to solve the above technical problems, the embodiments of the present disclosure provide a method, device, equipment and storage medium for smooth control of an energy storage system, which effectively reduces the charge and discharge process of the energy storage system, extends the life of the energy storage system, and at the same time realizes grid friendliness.

[0005] In a first aspect, the embodiments of the present disclosure provide a method for smooth control of an energy storage system, including:

[0006] Collect the current data of the wind-solar-storage integrated power station, where the current data includes the relevant data of the wind-solar power station and the state of charge of the battery of the energy storage system;

[0007] Calculate the current wind and light fluctuation change value of the wind-solar-storage integrated power station according to the relevant data of the wind-solar power station;

[0008] Compare the wind and light fluctuation change value with a first limit value to determine whether it is necessary for the energy storage system to perform smooth control, where the first limit value is calculated according to the relevant data of the wind-solar power station and a first preset threshold;

[0009] In the case of determining that it is necessary for the energy storage system to perform smooth control, determine the control mode for the energy storage system according to the state of charge, and perform smooth control on the energy storage system under the control mode.

[0010] Optionally, the relevant data of the wind-solar power station includes the first active power actually generated at the grid connection point. Calculating the current wind-solar fluctuation change value of the wind-solar-storage combined power station based on the relevant data of the wind-solar power station includes:

[0011] Statistically calculate the maximum value and the minimum value of the first active power within a preset time period;

[0012] Calculate the difference between the maximum value and the minimum value to obtain the current wind-solar fluctuation change value of the wind-solar-storage combined power station.

[0013] Optionally, the relevant data of the wind-solar power station includes the rated capacity of the wind-solar power station. Comparing the wind-solar fluctuation change value with a first limit value to determine whether the energy storage system needs to perform smoothing control includes:

[0014] Calculate the product of the rated capacity and a first preset threshold value to obtain the first limit value;

[0015] If the wind-solar fluctuation change value is less than or equal to the first limit value, it is determined that the energy storage system does not need to perform smoothing control; or, if the wind-solar fluctuation change value is greater than the first limit value, it is determined that the energy storage system needs to perform smoothing control.

[0016] Optionally, determining the control mode for the energy storage system according to the state of charge of the battery and, under the control mode, performing smoothing control on the energy storage system includes:

[0017] When the state of charge of the battery is greater than a second preset threshold value, determine the first mode as the control mode for the energy storage system. The control principle of the first mode is to control the energy storage system to only discharge and not charge within the maximum discharge power range;

[0018] When the state of charge of the battery is less than the second preset threshold value and greater than a third preset threshold value, calculate the first active power output according to the relevant data of the wind-solar power station and the wind-solar fluctuation change value, and determine the second mode as the control mode. The control principle of the second mode is to control the energy storage system to dispatch the first active power output for smoothing control;

[0019] When the state of charge of the battery is less than or equal to the third preset threshold value, determine the third mode as the control mode. The control principle of the third mode is to control the energy storage system to only charge and not discharge within the maximum charge power range.

[0020] Optionally, the relevant data of the wind-solar power station includes the rated capacity of the wind-solar power station, the second active power actually generated by the wind farm in the wind-solar power station at the current moment, and the third active power actually generated by the photovoltaics in the wind-solar power station. Calculating the first active power output according to the relevant data of the wind-solar power station and the wind-solar fluctuation change value includes:

[0021] Calculating the sum value of the second active power and the third active power;

[0022] Comparing the size of the wind-solar fluctuation change value and the limit value calculated according to the rated capacity and the fourth preset threshold, and determining the target threshold for calculating the first active power output at the current moment;

[0023] Calculating the first active power output according to the sum value, the target threshold, and the second active power output at the previous moment.

[0024] Optionally, the target threshold is one of a first threshold, a second threshold, and a third threshold, where the second threshold is greater than the first threshold and less than the third threshold. Comparing the size of the wind-solar fluctuation change value and the limit value calculated according to the rated capacity and the fourth preset threshold, and determining the target threshold for calculating the first active power output at the current moment includes:

[0025] Calculating the product of the fourth preset threshold and the rated capacity to obtain a second limit value and a third limit value;

[0026] When the wind-solar fluctuation change value is less than the second limit value, determining the first threshold as the target threshold; when the wind-solar fluctuation change value is greater than the second limit value and less than the third limit value, determining the second threshold as the target threshold; when the wind-solar fluctuation change value is greater than the third limit value, determining the third threshold as the target threshold.

[0027] Optionally, when it is determined that the energy storage system does not need to perform smoothing control, the method further includes:

[0028] Obtaining the first available active power of the wind-solar power station before the energy storage system exits the smoothing control and the second available active power of the wind-solar power station after the energy storage system exits the smoothing control;

[0029] Determining whether the available active power of the energy storage system shows an upward trend according to the first available active power and the second available active power;

[0030] When the available active power of the energy storage system shows an upward trend, if the energy storage system is in a charging state, it is controlled based on the first principle, or if the energy storage system is in a non-charging state, it is controlled based on the second principle; or,

[0031] When the available active power of the energy storage system shows a downward trend, if the energy storage system is in a discharging state, it is controlled based on the first principle, or if the energy storage system is in a non-discharging state, it is controlled based on the second principle;

[0032] wherein, the first principle refers to controlling the energy storage system to slowly recover to zero output with a preset step size, and the second principle refers to controlling the energy storage system to directly recover to zero output.

[0033] In a second aspect, an embodiment of the present disclosure provides an energy storage system smoothing control device, including:

[0034] An acquisition unit for acquiring current data of a wind-solar-storage integrated power station, where the current data includes relevant data of the wind-solar power station and the state of charge of the energy storage system;

[0035] A calculation unit for calculating the current wind-solar fluctuation change value of the wind-solar-storage integrated power station according to the relevant data of the wind-solar power station;

[0036] A comparison unit for comparing the wind-solar fluctuation change value with a first limit value to determine whether the energy storage system needs to perform smoothing control, wherein the first limit value is calculated according to the relevant data of the wind-solar power station and a first preset threshold;

[0037] A control unit for, when it is determined that the energy storage system needs to perform smoothing control, determining a control mode for the energy storage system according to the state of charge and performing smoothing control on the energy storage system under the control mode.

[0038] In a third aspect, an embodiment of the present disclosure provides an electronic device, including:

[0039] A memory;

[0040] A processor; and

[0041] A computer program;

[0042] wherein, the computer program is stored in the memory and is configured to be executed by the processor to implement the energy storage system smoothing control method as described above.

[0043] Fourthly, embodiments of the present disclosure provide a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the energy storage system smoothing control method described above are implemented.

[0044] The energy storage system smoothing control method provided by the present disclosure includes: collecting current data of a wind-solar-storage integrated power station, where the current data includes relevant data of the wind-solar power station and the state of charge of the battery of the energy storage system; calculating the current wind-solar fluctuation change value of the wind-solar-storage integrated power station according to the relevant data of the wind-solar power station; comparing the wind-solar fluctuation change value with a first limit value to determine whether the energy storage system needs to perform smoothing control, where the first limit value is calculated according to the relevant data of the wind-solar power station and a first preset threshold; in the case of determining that the energy storage system needs to perform smoothing control, determining the control mode for the energy storage system according to the state of charge of the battery, and performing smoothing control on the energy storage system under the control mode. The method provided by the present application effectively reduces the charge-discharge cycle of the energy storage system, extends the service life of the energy storage system, and at the same time realizes grid friendliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0047] Figure 1 It is a schematic flow chart of an energy storage system smoothing control method provided by an embodiment of the present disclosure;

[0048] Figure 2 It is a schematic overall flow chart of an energy storage system smoothing control method provided by an embodiment of the present disclosure;

[0049] Figure 3 It is a schematic flow chart of an energy storage system exiting smoothing control provided by an embodiment of the present disclosure;

[0050] Figure 4 It is a control curve comparison graph of the whole station response provided by an embodiment of the present disclosure;

[0051] Figure 5 It is a response curve graph of an energy storage system provided by an embodiment of the present disclosure;

[0052] Figure 6 It is a schematic structural diagram of an energy storage system smoothing control device provided by an embodiment of the present disclosure;

[0053] Figure 7 A structural schematic diagram of an electronic device provided by an embodiment of the present disclosure. Specific implementation manners

[0054] In order to more clearly understand the above objects, features, and advantages of the present disclosure, the solution of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other.

[0055] Many specific details are set forth in the following description to facilitate a thorough understanding of the present disclosure, but the present disclosure may be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.

[0056] Specifically, in the prior art, most energy storage systems are overly involved in the power control of suppressing the fluctuations of wind and light, without considering the acceptability of the power grid for the wind and light volatility, nor considering reducing the charge and discharge process of the energy storage system from the perspective of reducing unnecessary investment in the energy storage system, resulting in a shortened energy storage life and further affecting the overall station volatility.

[0057] In view of the above technical problems, the embodiment of the present disclosure provides an energy storage system smoothing control method, which can effectively reduce the charge and discharge process of the energy storage system and extend the energy storage life; at the same time, by calculating the wind and light volatility before and after smoothing, it is possible to effectively reduce the grid connection point volatility on the premise of reducing unnecessary investment in the energy storage system and achieve grid friendliness. Specific details are described in detail through one or more of the following embodiments.

[0058] Figure 1 A flowchart of an energy storage system smoothing control method provided by an embodiment of the present disclosure, specifically including the following steps S101 to S104 as Figure 1 shown:

[0059] S101. Collect the current data of the wind-solar-storage combined power station, where the current data includes the relevant data of the wind-solar power station and the state of charge of the energy storage system battery.

[0060] It is understandable that relevant data of the wind-solar-storage combined power station is read in real time, denoted as the current data. The current data can be the relevant data of the wind-solar-storage combined power station at the current moment, or all the relevant data of the wind-solar-storage combined power station before the current moment or a certain moment ago. The specific situation of the current data is not limited. The current data includes the relevant data of the wind-solar power station and the state of charge (SOC) of the energy storage system. The relevant data of the wind-solar power station includes the maximum available active power value of the wind farm, the actual active power value of the wind farm, the maximum available active power value of the photovoltaic power station, the actual active power value of the photovoltaic power station, the actual active power value at the grid connection point, and the rated capacities of the wind farm and the photovoltaic power station. Among them, the actual active power value can be understood as the actual active power output, and the state of charge of the battery is the ratio of the remaining battery power to the rated power.

[0061] S102. Calculate the current wind-solar fluctuation change value of the wind-solar-storage combined power station according to the relevant data of the wind-solar power station.

[0062] It is understandable that according to the relevant data of the wind-solar power station, the wind-solar fluctuation rate change limit value of the wind-solar-storage combined power station (the whole station) within a preset period is calculated to obtain the wind-solar fluctuation change value, which is used to judge the input time of the energy storage system. Preferably, the maximum limit value of the wind-solar fluctuation change within each preset period can be calculated by a sliding window. The preset period can be 60s, that is, the maximum limit value of the wind-solar fluctuation change in one minute is calculated.

[0063] Among them, the relevant data of the wind-solar power station includes the first active power actually output at the grid connection point.

[0064] Optionally, in the above S102, calculating the current wind-solar fluctuation change value of the wind-solar-storage combined power station according to the relevant data of the wind-solar power station can be specifically implemented through the following steps:

[0065] Statistically analyze the maximum and minimum values of the first active power within a preset period; calculate the difference between the maximum value and the minimum value to obtain the current wind-solar fluctuation change value of the wind-solar-storage combined power station.

[0066] Understandably, in one implementation scenario, the current moment is denoted as the 0th moment, and the first active power actually output at the grid connection point within a preset time period (0 s to 60 s) is collected. Among them, the relevant data of the wind-solar power station includes the first active power. The preset time period can be understood as a control cycle, and the control cycle at the 0th moment is 0 s to 60 s. The active power refers to the sum of all the active power actually output at the grid connection point. Subsequently, the maximum and minimum values of the first active power within the preset time period are calculated, and the difference between the two is used as the wind-solar fluctuation change value of the wind-solar storage combined power station at the current moment. In another implementation scenario, the next control cycle (1 s to 61 s) is denoted as the 1st moment, the active power actually output at the grid connection point within 1 s to 61 s is collected, the maximum and minimum values of the active power within this preset time period are calculated, and the difference between the two is the one-minute wind-solar fluctuation change value at the 1st moment. By analogy, the one-minute wind-solar fluctuation change value within each control cycle is calculated. The calculation formula for the wind-solar fluctuation change value is shown in Formula (1):

[0067] δ(k) = max t＝0,1,…,60 P all (t) - min t＝0,1,…,60 P all (t) Formula (1)

[0068] In the formula, δ(k) is the wind-solar fluctuation change value, and P all (t) is the first active power actually output at the grid connection point, and the change range of t is 0 s to 60 s.

[0069] S103. Compare the wind-solar fluctuation change value with the first limit value to determine whether the energy storage system needs to perform smoothing control.

[0070] Among them, the first limit value is calculated based on the relevant data of the wind-solar power station and the first preset threshold.

[0071] Understandably, based on the above S101 to S102, the first limit value is calculated according to the relevant data of the wind-solar power station and the first preset threshold. The first limit value is the lower limit value for judging whether the energy storage system needs to enter the smoothing control. Subsequently, compare the magnitudes of the wind-solar fluctuation change value and the first limit value to judge whether the energy storage system needs to perform smoothing control, that is, judge the input timing of the energy storage system.

[0072] Among them, the relevant data of the wind-solar power station includes the rated capacity of the wind-solar power station.

[0073] Optionally, in the above S103, comparing the wind-solar fluctuation change value with the first limit value to determine whether the energy storage system needs to perform smoothing control can be specifically implemented through the following steps:

[0074] Calculate the product of the rated capacity and the first preset threshold to obtain a first limit value. If the wind-solar fluctuation change value is less than or equal to the first limit value, it is determined that the energy storage system does not need to perform smoothing control; or, if the wind-solar fluctuation change value is greater than the first limit value, it is determined that the energy storage system needs to perform smoothing control.

[0075] It can be understood that by calculating the product of the rated capacity of a wind-solar power station and the first preset threshold, a first limit value is obtained. A wind-solar power station is a general term for a wind farm and a photovoltaic power station, and the first preset threshold is set by the user according to requirements. For example, the first preset threshold is 3%. Subsequently, it is judged whether the wind-solar fluctuation change value is greater than the first limit value. If the wind-solar fluctuation change value is less than or equal to the first limit value, it is determined that the energy storage system does not need to perform smoothing control; or, if the wind-solar fluctuation change value is greater than the first limit value, it is determined that the energy storage system needs to perform smoothing control, that is, when the one-minute wind-solar fluctuation change value of the whole station exceeds the lower limit value, the energy storage system enters the smoothing control. The specific judgment formula is shown in formula (2):

[0076]

[0077] In the formula, is the actual output of the energy storage system for smoothing control, is the active power output of the energy storage system for smoothing control, P cap is the rated capacity of the wind-solar power station, 3%*P cap is the first limit value, and 3% is the first preset threshold.

[0078] S104. When it is determined that the energy storage system needs to perform smoothing control, determine the control mode for the energy storage system according to the state of charge of the battery, and perform smoothing control on the energy storage system under the control mode.

[0079] It can be understood that on the basis of the above S103, when it is determined that the energy storage system needs to perform smoothing control, according to the state of charge of the battery of the energy storage system, the control mode for the energy storage system is determined, and different control modes correspond to different output ranges of the battery of the energy storage system. Subsequently, under this control mode, the output of the energy storage system is controlled for smoothing control.

[0080] Optionally, in the above S104, determining the control mode for the energy storage system according to the state of charge of the battery, and performing smoothing control on the energy storage system under the control mode can be specifically implemented through the following steps:

[0081] When the state of charge of the battery is greater than a second preset threshold, the first mode is determined as the control mode for the energy storage system. The control principle of the first mode is to control the energy storage system to only discharge and not charge within the maximum discharge power range; or, when the state of charge of the battery is less than the second preset threshold and greater than a third preset threshold, the first active power output is calculated based on the relevant data of the wind-solar power station and the wind-solar fluctuation change value, and the second mode is determined as the control mode. The control principle of the second mode is to control the energy storage system to dispatch the first active power output for smoothing control; or, when the state of charge of the battery is less than or equal to the third preset threshold, the third mode is determined as the control mode. The control principle of the third mode is to control the energy storage system to only charge and not discharge within the maximum charging power range.

[0082] It can be understood that the second preset threshold and the third preset threshold set in advance are obtained, where the second preset threshold is greater than the third preset threshold. It can be understood that the number and specific values of the preset thresholds are not limited and can be determined according to user needs. Preferably, the second preset threshold is 0.8 and the third preset threshold is 0.2. Subsequently, the size of the state of charge (SOC) of the battery is judged compared with the second preset threshold and the third preset threshold. When the state of charge of the battery is greater than the second preset threshold, the first mode is determined as the control mode for the energy storage system. The control principle of the first mode is to control the energy storage system to only discharge and not charge within the maximum discharge power range. That is, when the current SOC of the energy storage system is greater than 0.8, if it continues to charge, it will damage the battery life. Therefore, the operating principle of the energy storage system is to only discharge and not charge, and the charging power of the energy storage can be discharged between 0 and the maximum discharge power according to the actual situation; or, when the state of charge of the battery is less than the second preset threshold and greater than the third preset threshold, the first active power output is calculated based on the relevant data of the wind-solar power station and the wind-solar fluctuation change value. The first active power output refers to the actual output that the energy storage system can currently provide for smoothing control, and the second mode is determined as the control mode. The control principle of the second mode is to control the energy storage system to dispatch the first active power output for smoothing control; or, when the state of charge of the battery is less than or equal to the third preset threshold, the third mode is determined as the control mode. The control principle of the third mode is to control the energy storage system to only charge and not discharge within the maximum charging power range. That is, when the SOC of the energy storage system is less than 0.2, to ensure the life of the energy storage system, the operating principle of the energy storage system in the current state is to only charge and not discharge, and the charging power of the energy storage system can be charged between 0 and the maximum charging power according to the actual situation. According to the current SOC of the energy storage system, the output range of the current energy storage battery is determined, as shown in formula (3) specifically:

[0083]

[0084] Wherein, is the maximum discharge power of the energy storage system, refers to the maximum charging power of the energy storage system, SOC is the state of charge of the battery, 0.8 is the second preset threshold, and 0.2 is the third preset threshold.

[0085] Among them, the relevant data of the wind-solar power station includes the rated capacity of the wind-solar power station, the second active power actually generated by the wind farm in the wind-solar power station at the current moment, and the third active power actually generated by the photovoltaic in the wind-solar power station.

[0086] Optionally, calculating the first active power output according to the relevant data of the wind-solar power station and the wind-solar fluctuation change value can be specifically implemented through the following steps:

[0087] Calculate the sum value of the second active power and the third active power; compare the size of the wind-solar fluctuation change value and the limit value calculated according to the rated capacity and the fourth preset threshold to determine the target threshold for calculating the first active power output at the current moment; calculate the first active power output according to the sum value, the target threshold, and the second active power output at the previous moment.

[0088] It can be understood that based on the idea of interval control, an adaptive control strategy for the energy storage system to suppress wind-solar fluctuations is designed to determine the actual output that the energy storage system can currently generate for smoothing control. Specifically, calculate the sum value of the second active power (the actual active power value of the wind farm) actually generated by the wind farm at the current moment and the third active power (the actual active power value of the photovoltaic power station) actually generated by the photovoltaic power station. Subsequently, calculate the product of the fourth preset threshold and the rated capacity of the wind-solar power station to obtain the target limit value, compare the size of the wind-solar fluctuation value and the target limit value, and determine the target threshold for calculating the first active power output at the current moment. Obtain the second active power output calculated at the previous moment. Subsequently, calculate the product of the sum value, the second active power, and the target threshold to obtain the first active power output at the current moment.

[0089] Among them, the target threshold is one of the first threshold, the second threshold, and the third threshold, where the second threshold is greater than the first threshold and less than the third threshold.

[0090] Optionally, comparing the size of the wind-solar fluctuation change value and the limit value calculated according to the rated capacity and the fourth preset threshold to determine the target threshold for calculating the first active power output at the current moment can be specifically implemented through the following steps:

[0091] Calculate the product of the fourth preset threshold and the rated capacity to obtain a second limit value and a third limit value; when the wind-solar fluctuation change value is less than the second limit value, determine the first threshold as the target threshold; when the wind-solar fluctuation change value is greater than the second limit value and less than the third limit value, determine the second threshold as the target threshold; when the wind-solar fluctuation change value is greater than the third limit value, determine the third threshold as the target threshold.

[0092] It can be understood that the fourth preset threshold includes threshold 1 and threshold 2. Preferably, threshold 1 can be 5% and threshold 2 can be 7%. Calculate the product of threshold 1 and the rated capacity to obtain the second limit value, and calculate the product of threshold 2 and the rated capacity to obtain the third limit value. Judge the magnitude relationship between the wind-solar fluctuation change value and the second and third limit values. When the wind-solar fluctuation change value is less than the second limit value and greater than the first limit value, determine the first threshold as the target threshold, and the first threshold can be 5. When the wind-solar fluctuation change value is greater than the second limit value and less than the third limit value, determine the second threshold as the target threshold, and the second threshold can be 10. When the wind-solar fluctuation change value is greater than the third limit value, determine the third threshold as the target threshold, and the third threshold can be 15. Among them, the first threshold is less than the second threshold, the second threshold is less than the third threshold, and the threshold can be determined by the user's needs and is not limited here.

[0093] It can be understood that the energy storage system adaptively adjusts the time constant of the filter according to the current wind-solar fluctuation change value. The time constant is the target threshold determined adaptively above, so as to reduce the input of the energy storage system when the wind-solar fluctuation change value is small, thereby reducing the charge and discharge cycle of the energy storage system. If the wind-solar fluctuation change value at the current moment is less than the second limit value, the energy storage system needs to charge and discharge slightly to ensure the wind-solar fluctuation change value in the current minute. If the current wind-solar fluctuation change value is greater than the second limit value and less than the third limit value, select the filter corresponding to the larger time constant to make the filtering result more stable. If the current wind-solar fluctuation change value is greater than the third limit value, the energy storage system needs to charge and discharge significantly to ensure the wind-solar fluctuation change value in the current minute. The calculation formula for the first active power output of the energy storage system is shown in formula (4):

[0094]

[0095] In the formula, is the first active power output, is the sum of the second active power and the third active power, is the second active power actually generated by the wind farm, is the third active power actually generated by the photovoltaic power station, P cap is the rated capacity of the wind-solar power station, is the second active output at the previous moment, T is the control period, 5 is the first threshold, 10 is the second threshold, 15 is the third threshold, 3%*P cap The first limit is 5%*P cap The second limit is 7%*P cap is the third limit.

[0096] Optionally, when it is determined that the energy storage system does not need to perform smooth control, the method further includes:

[0097] Obtain the first generable active power of the wind-solar power station before the energy storage system exits smooth control and the second generable active power of the wind-solar power station after the energy storage system exits smooth control; determine whether the generable active power of the energy storage system is on an upward trend according to the first generable active power and the second generable active power; in the case where the generable active power of the energy storage system is on an upward trend, if the energy storage system is in a charging state, control the energy storage system based on a first principle, or, if the energy storage system is in an uncharged state, control the energy storage system based on a second principle; or, in the case where the generable active power of the energy storage system is on a downward trend, if the energy storage system is in a discharging state, control the energy storage system based on the first principle, or, if the energy storage system is in a undischarging state, control the energy storage system based on the second principle; wherein the first principle refers to controlling the energy storage system to slowly recover to zero output with a preset step length, and the second principle refers to controlling the energy storage system to directly recover to zero output.

[0098] It is understandable that when it is determined that the energy storage system does not need to perform smooth control, that is, when the one-minute change limit of the wind-solar fluctuation change value is less than the lower limit, the maximum wind-solar power generation direction before and after the energy storage system exits smooth control is determined, and the logic of the energy storage system exiting smooth control is designed for different working conditions to achieve the minimum disturbance exit. At the same time, it can also prevent the increase in the volatility of the entire station caused by the exit of the energy storage system. The exit control steps for the energy storage system are as follows: Record the moment when the energy storage system exits smooth control, that is, the current moment when the wind-solar fluctuation change value is less than the first limit value is the moment when the energy storage system exits smooth control. Obtain the first generateable active power of the wind and solar power stations before the energy storage system exits smooth control and the second generateable active power of the wind and solar power stations after the energy storage system exits smooth control. The generateable active power refers to the maximum generateable active power value of the wind farm. and the maximum active power that can be generated by the photovoltaic power station Sum value. Subsequently, it is determined whether the second available active power is greater than the first available active power, and according to the determination result, it is determined whether the available active power of the energy storage system shows an upward trend or a downward trend. If the first available active power is less than the second available active power, it indicates that the available active power shows an upward trend. On the contrary, if the first available active power is greater than the second available active power, it indicates that the available active power shows a downward trend. The upward trend and the downward trend also have opposite directions for the adjustment actions of the energy storage system, so as to avoid the increase in the overall station volatility caused by the withdrawal of the energy storage system. After determining the change trend of the available active power, it is also necessary to determine the operating state of the energy storage system. When the available active power of the energy storage system shows an upward trend, it is determined whether the energy storage system is currently in a charging state. If the energy storage system is in a charging state, the energy storage system is controlled based on the first principle, that is, the energy storage system is controlled to slowly recover from the current state to zero output with a small step size. Or, if the energy storage system is in a non-charging state, the non-charging state can be a discharging state, then the energy storage system is controlled based on the second principle, that is, the energy storage system is controlled to directly recover from the current state to zero output. That is, when the maximum available active power of wind and light shows an upward trend, if the energy storage system is charging, it cannot immediately drop to 0. If it immediately drops to 0, it will cause an instantaneous spike in the active power output of the power station. Therefore, it needs to be slowly reduced to 0 with a small step size. When the available active power of the energy storage system shows a downward trend, it is determined whether the energy storage system is currently in a discharging state. If the energy storage system is in a discharging state, the energy storage system is controlled based on the first principle, that is, the energy storage system is controlled to slowly recover from the current state to zero output with a small step size. Or, if the energy storage system is in a non-discharging state, the non-discharging state can be a charging state, then the energy storage system is controlled based on the second principle, that is, the energy storage system is controlled to directly recover from the current state to zero output. That is, when the maximum available active power of wind and light shows a downward trend, if the energy storage system is discharging, it cannot immediately drop to 0, otherwise it will cause a sudden drop in the active power output of the power station.

[0099] A smooth control method for an energy storage system provided by an embodiment of the present disclosure proposes a new way for the energy storage system to participate in smooth control, takes into account the acceptability of the power grid to the fluctuations of wind and light, develops a control strategy from the perspective of reducing the unnecessary investment of the energy storage system, and performs adaptive control on the energy storage system to suppress the fluctuations of wind and light based on the change value of wind and light fluctuations, effectively reducing the charge and discharge process of the energy storage system, and finally achieving the extension of the energy storage life and grid friendliness.

[0100] Based on the above embodiments, Figure 2 is a schematic diagram of the overall process of a smooth control method for an energy storage system provided by an embodiment of the present disclosure, specifically including the steps as Figure 2 shown:

[0101] (1) Read the relevant data of the wind-solar-storage integrated power station; (2) Calculate the wind-solar volatility (wind-solar fluctuation change value) of the whole station in real time; (3) Judge the timing of energy storage input smoothing control in real time; (4) Design an adaptive smoothing control strategy for energy storage to suppress wind-solar fluctuations; (5) Adaptively switch the filter parameters according to wind-solar fluctuations; (6) Design the logic of energy storage withdrawal smoothing control; (7) Judge the wind-solar fluctuation direction after the energy storage withdrawal moment; (8) Select the withdrawal method according to the current energy storage operation state.

[0102] It is understandable that for the specific factual descriptions of the above steps (1) to (8), please refer to the above embodiments and will not be elaborated here.

[0103] Based on the above embodiments, Figure 3 The following is a schematic flowchart of the energy storage system withdrawal smoothing control provided by the embodiments of the present disclosure, which specifically includes the steps as Figure 3 shown:

[0104] (1) Record the moment of energy storage system withdrawal smoothing control; (2) Judge whether the sum of the maximum available active power of the wind farm and the maximum available active power of the photovoltaic power station after the energy storage withdrawal smoothing control is greater than the sum of the maximum available active power of the wind farm and the maximum available active power of the photovoltaic power station before the energy storage withdrawal smoothing control; (3) When the maximum available active power of wind and light shows an upward trend, judge whether the energy storage system is in a charging state; (4) If the energy storage system is in a charging state, instruct the energy storage system to slowly recover to zero output with a small step size; (5) If the energy storage system is not in a charging state, instruct the energy storage system to directly recover to zero output; (6) When the maximum available active power of wind and light shows a downward trend, judge whether the energy storage system is in a discharging state; (7) If the energy storage system is in a discharging state, instruct the energy storage system to slowly recover to zero output with a small step size; (8) If the energy storage system is not in a discharging state, instruct the energy storage system to directly recover to zero output. (9) The energy storage system receives the control instruction and executes the control strategy.

[0105] It is understandable that for the specific factual descriptions of the above steps (1) to (9), please refer to the above embodiments and will not be elaborated here.

[0106] Based on the above embodiments, in a test scenario applying the energy storage system smoothing control method, the setting conditions of the operating parameters of the wind-solar-storage integrated power station are as follows. Wind farm operating conditions: The rated power of wind power is 425 MW, and the wind fluctuation range is 10% of the rated power of wind power; Photovoltaic operating conditions: The rated power of photovoltaic is 75 MW, and the light power fluctuation range is 30% of the rated power of photovoltaic; Energy storage power station operating conditions: The initial state of charge of the energy storage is within the normal range of 0.2 to 0.8, and the energy storage system is put into operation. Under the setting of these operating parameters, an adaptive control strategy for energy storage to suppress wind-solar fluctuations based on the wind-solar volatility interval is realized.

[0107] It is understandable that in the active power smoothing scenario, to ensure that the wind turbines and inverters generate power at full capacity, the energy storage system performs fluctuation suppression operations within its capacity. After the power smoothing function is enabled, the Automatic Generation Control (AGC) suppresses the active power fluctuations at the grid connection point by controlling the charge and discharge of the energy storage, so that the actual active power fluctuation range of the whole field is less than the sum of the actual power generations of the wind and light. The comparison curve is as Figure 4 shown. The sum of the maximum power generations of the wind and light is greater than the actual active power at the grid connection point. The test results are shown in Table 1. Under the two test scenarios of enabling the smoothing mode and the non-smoothing mode respectively, the maximum limit value of the active power change in one minute is calculated. In the non-smoothing mode, the maximum limit value of the active power change in one minute is 50.73 MW, while in the enabled smoothing mode, the maximum limit value of the active power change in one minute is 32.46 MW, effectively suppressing the fluctuation range of the actual active power of the whole field. Specifically, after the power smoothing function of the energy storage is enabled, the AGC suppresses the active power fluctuations at the grid connection point by controlling the charge and discharge of the energy storage, so that the actual active power fluctuation range of the whole field is less than the sum of the actual power generations of the wind and light, which is consistent with the control logic. In addition, as Figure 5 can be seen from the response curve of the energy storage system shown, within 100 - 140 s, since the wind and light volatility is low, the energy storage system does not operate, thereby reducing the charge and discharge cycle of the energy storage, which is in line with the above control logic for the charge and discharge of the energy storage.

[0108] Figure 6 FIG. is a schematic structural diagram of an energy storage system smoothing control device provided by an embodiment of the present disclosure. The energy storage system smoothing control device provided by the embodiment of the present disclosure can execute the processing flow provided by the embodiment of the energy storage system smoothing control method. As Figure 6 shown, the device 600 includes:

[0109] A collection unit 601, configured to collect current data of a wind-solar-storage combined power station, where the current data includes relevant data of the wind-solar power station and the state of charge of the battery of the energy storage system;

[0110] A calculation unit 602, configured to calculate the current wind and light fluctuation change value of the wind-solar-storage combined power station according to the relevant data of the wind-solar power station;

[0111] A comparison unit 603, configured to compare the wind and light fluctuation change value with a first limit value to determine whether the energy storage system needs to perform smoothing control, where the first limit value is calculated according to the relevant data of the wind-solar power station and a first preset threshold;

[0112] A control unit 604, configured to, when it is determined that the energy storage system needs to perform smoothing control, determine a control mode for the energy storage system according to the state of charge of the battery, and perform smoothing control on the energy storage system in the control mode.

[0113] Optionally, the relevant data of the wind-solar power station in the device 600 includes the first active power actually generated at the grid connection point.

[0114] Optionally, the calculation unit 602 is configured to:

[0115] Statistically calculate the maximum value and the minimum value of the first active power within a preset time period;

[0116] Calculate the difference between the maximum value and the minimum value to obtain the current wind-solar fluctuation change value of the wind-solar-storage combined power station.

[0117] Optionally, the relevant data of the wind-solar power station in the device 600 includes the rated capacity of the wind-solar power station.

[0118] Optionally, the comparison unit 603 is configured to:

[0119] Calculate the product of the rated capacity and a first preset threshold to obtain a first limit value;

[0120] If the wind-solar fluctuation change value is less than or equal to the first limit value, it is determined that the energy storage system does not need to perform smoothing control; or, if the wind-solar fluctuation change value is greater than the first limit value, it is determined that the energy storage system needs to perform smoothing control.

[0121] Optionally, the control unit 604 is configured to:

[0122] When the state of charge of the battery is greater than a second preset threshold, determine the first mode as the control mode for the energy storage system, and the control principle of the first mode is to control the energy storage system to only discharge and not charge within the maximum discharge power range;

[0123] When the state of charge of the battery is less than the second preset threshold and greater than a third preset threshold, calculate the first active power output according to the relevant data of the wind-solar power station and the wind-solar fluctuation change value, and determine the second mode as the control mode, and the control principle of the second mode is to control the energy storage system to dispatch the first active power output for smoothing control;

[0124] When the state of charge of the battery is less than or equal to the third preset threshold, determine the third mode as the control mode, and the control principle of the third mode is to control the energy storage system to only charge and not discharge within the maximum charging power range.

[0125] Optionally, the relevant data of the wind-solar power station in the device 600 includes the rated capacity of the wind-solar power station, the second active power actually generated by the wind farm in the wind-solar power station at the current moment, and the third active power actually generated by the photovoltaic power station in the wind-solar power station.

[0126] Optionally, the control unit 604 is configured to:

[0127] Calculate the sum of the second active power and the third active power;

[0128] Compare the wind-solar fluctuation change value with the limit value calculated according to the rated capacity and the fourth preset threshold, and determine the target threshold for calculating the first active power output at the current moment;

[0129] Calculate the first active power output according to the sum value, the target threshold, and the second active power output at the previous moment.

[0130] Optionally, the target threshold in the device 600 is one of a first threshold, a second threshold, and a third threshold, where the second threshold is greater than the first threshold and less than the third threshold.

[0131] Optionally, the control unit 604 is configured to:

[0132] Calculate the product of the fourth preset threshold and the rated capacity to obtain a second limit value and a third limit value;

[0133] In the case where the wind-solar fluctuation change value is less than the second limit value, determine the first threshold as the target threshold; in the case where the wind-solar fluctuation change value is greater than the second limit value and less than the third limit value, determine the second threshold as the target threshold; in the case where the wind-solar fluctuation change value is greater than the third limit value, determine the third threshold as the target threshold.

[0134] Optionally, the device 600 is further configured to:

[0135] Obtain the first available active power of the wind-solar power station before the energy storage system exits the smoothing control and the second available active power of the wind-solar power station after the energy storage system exits the smoothing control;

[0136] Determine whether the available active power of the energy storage system shows an upward trend according to the first available active power and the second available active power;

[0137] In the case where the available active power of the energy storage system shows an upward trend, if the energy storage system is in a charging state, control the energy storage system based on the first principle, or if the energy storage system is in a non-charging state, control the energy storage system based on the second principle; or,

[0138] In the case where the available active power of the energy storage system shows a downward trend, if the energy storage system is in a discharging state, control the energy storage system based on the first principle, or if the energy storage system is in a non-discharging state, control the energy storage system based on the second principle;

[0139] Among them, the first principle refers to controlling the energy storage system to slowly recover to zero output in a preset step, and the second principle refers to controlling the energy storage system to directly recover to zero output.

[0140] Figure 6 The energy storage system smooth control device of the illustrated embodiment can be used to execute the technical solution of the above method embodiment, and its implementation principle and technical effect are similar, which will not be elaborated here.

[0141] Figure 7 It is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure. Specifically refer to Figure 7 , which shows a schematic structural diagram of an electronic device 700 suitable for implementing the present disclosure. The electronic device 700 in the embodiment of the present disclosure may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Tablet Computers), PMPs (Portable Multimedia Players), vehicle terminals (such as vehicle navigation terminals), wearable electronic devices, etc., and fixed terminals such as digital TVs, desktop computers, smart home devices, etc. Figure 7 The electronic device shown is only an example and should not impose any limitations on the functions and usage scope of the embodiments of the present disclosure.

[0142] As Figure 7 shown, the electronic device 700 may include a processing device (such as a central processing unit, a graphics processing unit, etc.) 701, which can execute various appropriate actions and processes according to the program stored in the read-only memory (ROM) 702 or the program loaded from the storage device 708 into the random access memory (RAM) 703 to implement the energy storage system smooth control method of the embodiment as described in the present disclosure. In the RAM 703, various programs and data required for the operation of the electronic device 700 are also stored. The processing device 701, the ROM 702, and the RAM 703 are connected to each other through a bus 704. The input / output (I / O) interface 705 is also connected to the bus 704.

[0143] Generally, the following devices may be connected to the I / O interface 705: an input device 706 including, for example, a touch screen, a touchpad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; an output device 707 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 708 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 709. The communication device 709 may allow the electronic device 700 to communicate with other devices wirelessly or wiredly to exchange data. Although Figure 7An electronic device 700 is shown with various devices, but it should be understood that it is not required to implement or have all the devices shown. Instead, more or fewer devices may be implemented or had.

[0144] In particular, according to an embodiment of the present disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, an embodiment of the present disclosure includes a computer program product that includes a computer program carried on a non-transitory computer-readable medium, and the computer program includes program code for performing the method shown in the flowchart, so as to implement the energy storage system smoothing control method as described above. In such an embodiment, the computer program can be downloaded and installed from the network through the communication device 709, or installed from the storage device 708, or installed from the ROM 702. When the computer program is executed by the processing device 701, the above functions defined in the method of the embodiment of the present disclosure are executed.

[0145] It should be noted that the above computer-readable medium in the present disclosure can be a computer-readable signal medium or a computer-readable storage medium or any combination of the two. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the computer-readable storage medium can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. And in the present disclosure, the computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, in which computer-readable program code is carried. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium, and the computer-readable signal medium can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted by any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0146] In some embodiments, the client and the server can communicate using any currently known or future-developed network protocol such as HTTP (HyperText Transfer Protocol), and can be interconnected with digital data communication in any form or medium (e.g., a communication network). Examples of communication networks include local area networks ("LANs"), wide area networks ("WANs"), the Internet (e.g., the Internet), and end-to-end networks (e.g., ad hoc end-to-end networks), as well as any currently known or future-developed networks.

[0147] The above computer-readable medium can be included in the above electronic device; or can exist separately without being assembled into the electronic device.

[0148] Optionally, when the above one or more programs are executed by the electronic device, the electronic device can also perform the other steps described in the above embodiments.

[0149] Computer program code for performing the operations of the present disclosure can be written in one or more programming languages or combinations thereof. The above programming languages include, but are not limited to, object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., by using an Internet service provider to connect through the Internet).

[0150] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a portion of code that contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions noted in the blocks may occur in a different order than that noted in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, or they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or by a combination of dedicated hardware and computer instructions.

[0151] The units involved in the embodiments described in the present disclosure can be implemented in software or in hardware. In some cases, the name of the unit does not constitute a limitation on the unit itself.

[0152] The functions described above herein can be performed at least in part by one or more hardware logic components. By way of example and not limitation, exemplary types of hardware logic components that can be used include: field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems on a chip (SOCs), complex programmable logic devices (CPLDs), and the like.

[0153] In the context of the present disclosure, a machine-readable medium can be a tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0154] It should be noted that in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or gateway comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or gateway. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or gateway comprising the said element.

[0155] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments described herein, but rather will conform to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for smooth control of an energy storage system, characterized in that: include: Collecting current data of the wind-solar-energy-storage combined power station, the current data including relevant data of the wind-solar power station and the battery charge state of the energy storage system; Calculate the current wind-solar fluctuation change value of the wind-solar-storage combined power station according to the relevant data of the wind-solar power station; Compare the wind-solar power fluctuation change value with a first limit value to determine whether the energy storage system needs to perform smoothing control, wherein the first limit value is calculated based on relevant data of the wind-solar power station and a first preset threshold value; In the case where it is determined that the energy storage system needs to be smoothly controlled, determining a control mode for the energy storage system according to the battery state of charge, and performing smooth control on the energy storage system under the control mode; When it is determined that the energy storage system does not need to perform smooth control, obtain the first generateable active power of the wind-solar power station before the energy storage system exits smooth control and the second generateable active power of the wind-solar power station after the energy storage system exits smooth control; determine whether the generateable active power of the energy storage system is on an upward trend based on the first generateable active power and the second generateable active power; when the generateable active power of the energy storage system is on an upward trend, if the energy storage system is in a charging state, control the energy storage system based on a first principle, or, if the energy storage system is in an uncharged state, control the energy storage system based on a second principle; wherein, the first principle refers to controlling the energy storage system to slowly recover to zero output with a preset step size, and the second principle refers to controlling the energy storage system to directly recover to zero output.

2. The method according to claim 1, characterized in that The relevant data of the wind-solar power station includes the first active power actually emitted by the grid connection point, and the current wind-solar fluctuation change value of the wind-solar-storage combined power station is calculated according to the relevant data of the wind-solar power station, including: Counting the maximum and minimum values ​​of the first active power within a preset time period; The difference between the maximum value and the minimum value is calculated to obtain the current wind-solar fluctuation change value of the wind-solar-storage combined power station.

3. The method according to claim 1, characterized in that The relevant data of the wind-solar power station includes the rated capacity of the wind-solar power station, and the comparing the wind-solar fluctuation change value with the first limit value to determine whether the energy storage system needs to perform smooth control includes: Calculating the product of the rated capacity and a first preset threshold to obtain a first limit value; If the wind-solar fluctuation change value is less than or equal to the first limit value, it is determined that the energy storage system does not need to perform smooth control; or, if the wind-solar fluctuation change value is greater than the first limit value, it is determined that the energy storage system needs to perform smooth control.

4. The method according to claim 1, characterized in that: The step of determining a control mode for the energy storage system according to the battery state of charge, and smoothly controlling the energy storage system under the control mode, includes: When the battery state of charge is greater than a second preset threshold, the first mode is determined as the control mode for the energy storage system, and the control principle of the first mode is to control the energy storage system to discharge but not charge within the maximum discharge power range; When the battery state of charge is less than the second preset threshold and greater than the third preset threshold, the first active output is calculated according to the relevant data of the wind-solar power station and the wind-solar fluctuation change value, and the second mode is determined as the control mode, and the control principle of the second mode is to control the energy storage system to dispatch the first active output for smooth control; When the battery state of charge is less than or equal to the third preset threshold, the third mode is determined as the control mode, and the control principle of the third mode is to control the energy storage system to only charge but not discharge within the maximum charging power range.

5. The method according to claim 4, characterized in that The relevant data of the wind-solar power station include the rated capacity of the wind-solar power station, the second active power actually emitted by the wind farm in the wind-solar power station at the current moment, and the third active power actually emitted by the photovoltaic power station in the wind-solar power station. The first active output is calculated according to the relevant data of the wind-solar power station and the wind-solar fluctuation change value, including: Calculating a sum of the second active power and the third active power; Compare the wind / solar power fluctuation change value with the limit value calculated according to the rated capacity and the fourth preset threshold value, and determine a target threshold value for calculating the first active power output at the current moment; The first active output is calculated according to the sum, the target threshold and the second active output at the previous moment.

6. The method according to claim 5, characterized in that The target threshold is one of a first threshold, a second threshold and a third threshold, wherein the second threshold is greater than the first threshold and less than the third threshold, and the comparing the wind-solar fluctuation change value and the limit value calculated according to the rated capacity and the fourth preset threshold to determine the target threshold for calculating the first active output at the current moment includes: Calculating the product of the fourth preset threshold and the rated capacity to obtain a second limit value and a third limit value; When the wind-light fluctuation change value is less than the second limit value, the first threshold is determined as the target threshold value; when the wind-light fluctuation change value is greater than the second limit value and less than the third limit value, the second threshold is determined as the target threshold value; when the wind-light fluctuation change value is greater than the third limit value, the third threshold is determined as the target threshold value.

7. The method according to claim 1, characterized in that The method further comprises: When the active power that can be generated by the energy storage system shows a downward trend, if the energy storage system is in a discharging state, the energy storage system is controlled based on the first principle; or, if the energy storage system is in a non-discharging state, the energy storage system is controlled based on the second principle.

8. A smooth control device for an energy storage system, characterized in that: include: A collection unit, used to collect current data of the wind-solar-storage combined power station, wherein the current data includes relevant data of the wind-solar power station and the battery charge state of the energy storage system; A calculation unit, used for calculating the current wind-solar fluctuation change value of the wind-solar-storage combined power station according to the relevant data of the wind-solar power station; A comparison unit, used to compare the wind-solar power fluctuation change value with a first limit value, and determine whether the energy storage system needs to perform smoothing control, wherein the first limit value is calculated based on relevant data of the wind-solar power station and a first preset threshold value; A control unit, configured to determine a control mode for the energy storage system according to the battery state of charge when it is determined that the energy storage system needs to be smoothly controlled, and to smoothly control the energy storage system under the control mode; Wherein, the control unit is also used to obtain the first generateable active power of the wind and solar power stations before the energy storage system exits smooth control and the second generateable active power of the wind and solar power stations after the energy storage system exits smooth control when it is determined that the energy storage system does not need to perform smooth control; determine whether the generateable active power of the energy storage system shows an upward trend based on the first generateable active power and the second generateable active power; when the generateable active power of the energy storage system shows an upward trend, if the energy storage system is in a charging state, control the energy storage system based on a first principle, or, if the energy storage system is in an uncharged state, control the energy storage system based on a second principle; wherein, the first principle refers to controlling the energy storage system to slowly recover to zero output with a preset step size, and the second principle refers to controlling the energy storage system to directly recover to zero output.

9. An electronic device, characterized in that: include: Memory; Processor; And a computer program; wherein the computer program is stored in the memory and is configured to be executed by the processor to implement the energy storage system smooth control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the energy storage system smooth control method as described in any one of claims 1 to 7 are implemented.

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