CN106329553A - Wind power plant operation control device and method and wind power plant system - Google Patents

Abstract

Provided are an energy storage system-based wind farm operation control device, a wind farm operation control method, and a wind farm system equipped with the wind farm operation control device. The wind farm operation control device has: an initial value setting unit, which sets the maximum output power and the minimum output power when the combined wind storage output of the wind farm system meets the allowable prediction error according to the wind power prediction power and the allowable prediction error; and the energy storage system The control unit predicts the remaining capacity of the energy storage system at the next moment based on the target power of the wind-storage synthesis output and the actual wind power output of the wind farm, and adjusts the target power of the wind-storage synthesis output at the current moment according to the remaining capacity at the next moment , to control the charging and discharging power of the energy storage system. According to the present invention, the combined wind storage output power of the wind farm system can be precisely controlled, and the risk that the wind storage combined output exceeds the rated range during later operation can be reduced.

Description

Wind farm operation control device, method and wind farm system

technical field

The invention relates to an energy storage system-based wind farm operation control device, a wind farm operation control method and a wind farm system.

Background technique

In recent years, due to the increasingly serious environmental and energy problems, the application of renewable energy has received more and more attention. As one of the most economical renewable energy resources, wind power has gradually become a substitute for fossil energy. With the rapid development of wind power technology, the proportion of wind power installed capacity in the power grid continues to increase, but wind energy resources are random and intermittent, so after large-scale access to wind power, it is inevitable that the stable operation of the entire power grid will be affected. Many uncertain factors are added, which greatly increases the difficulty of power grid planning and dispatching.

In addition, in some areas with rich wind resources but not too large power load, the wind power cannot be quickly and reasonably allocated because the power plant is located in the area where the wind power cannot be absorbed in time, and the relevant dispatching department does not have very accurate forecast data. As a result, many wind farms have been forced to cut power and the curtailment of wind has continued to increase.

Although scholars have done a lot of research work on wind power forecasting, it is still difficult to obtain accurate forecasting results. In China, the actual annual average wind power generation is 20% to 30% lower than the predicted value, and a very small number of farms even reach 40%. Therefore, in order to make the reliability level and economical level of wind power reach the ideal range, the wind power system is generally equipped with an energy storage system as a backup power capacity. The energy storage device controls the charge and discharge to output or store energy, so as to reduce the economic loss caused by power cuts caused by power prediction errors, improve the utilization rate of wind power, increase its dispatchability, and reduce the wind power consumption. net impact.

In Patent Document 1 (CN20570505A), a control method of a battery energy storage system for peak-shaving and valley-filling of wind power is disclosed. Specifically, in the invention of Patent Document 1, based on the battery energy storage system and combined with the ultra-short-term prediction method of wind power, the combined output power of wind storage is kept at 4 hours by partially cutting peaks and filling valleys of wind power output. The weighted average value of the ultra-short-term forecast data of wind power is within a certain bandwidth range centered, thereby reducing the deviation between the actual output power of wind power and the predicted power, and reducing the pressure of peak regulation and frequency regulation brought by wind power grid connection to the power system.

However, in the method of the above patent document 1, only the ultra-short-term predictive control of the energy storage system is considered to reduce the error of wind power prediction, and the problem of maximizing the wind-storage combined output is not considered. Therefore, there is a waste of resources problems, which in turn affect the economic benefits of wind farms. At the same time, the risk of wind storage synthesis output exceeding the rated range was not considered.

In Patent Document 2 (104283225A), a wind farm operation control device that can not only maximize the combined output of wind storage but also reduce the loss caused by curtailment of power and wind is disclosed. The device uses the historical data of wind power generation and the energy storage information of the energy storage system to calculate the energy storage capacity required by the energy storage system when compensating for wind power prediction errors as a safety margin, and takes the difference between the current capacity of the energy storage system and the safety margin as A part of the output of the wind power generation system within a specified period is used to adjust the wind power generation plan and control the wind power in real time.

However, in the method of the above patent document 2, although the maximization of the combined wind-storage output and the risk of the wind farm exceeding the rated range are considered, the charging and discharging power of the battery is only determined by comparing the remaining capacity of the battery with the safety margin. , so although the result can be controlled within the allowable range of prediction error, the accuracy is still lacking.

Contents of the invention

The object of the present invention is to provide a wind farm operation control device and method capable of accurately controlling the combined wind-storage output power of a wind farm system equipped with an energy storage system to reduce the deviation between the wind-storage combined output power and the predicted power, and a wind farm operation control device with the The wind farm system of the wind farm operation control device.

Provided is a wind farm operation control device, which is applied to a wind farm system equipped with an energy storage system, and includes: an initial value setting unit, which sets the wind storage combination of the wind farm system according to the predicted power of wind power and the allowable prediction error Outputting the maximum output power and the minimum output power when the allowable prediction error is satisfied; and the energy storage system control unit predicting the next moment of the energy storage system according to the target power of the combined wind-storage output and the actual wind power output power of the wind farm According to the predicted remaining capacity of the energy storage system at the next moment, adjust the target power of the combined wind-storage output at the current moment to control the charging and discharging power of the energy storage system.

In addition, a wind farm operation control method is provided, which is applied to a wind farm system equipped with an energy storage system, including: an initial value setting step, setting the wind storage capacity of the wind farm system according to the predicted power of wind power and the allowable prediction error The maximum output power and the minimum output power when the composite output meets the allowable prediction error; and the energy storage system control step, predicting the next step of the energy storage system according to the target power of the wind storage composite output and the actual wind power output power of the wind farm The remaining capacity of the moment, according to the predicted remaining capacity of the energy storage system at the next moment, adjust the target power of the wind storage synthesis output at the current moment, and control the charging and discharging power of the energy storage system.

Furthermore, a wind farm system is provided, comprising: a wind power generation device; a wind power prediction device, which establishes a wind power prediction model according to meteorological conditions and statistical laws, and outputs wind power prediction power; an energy storage system, which performs charging and discharging to compensate for the wind power prediction The error between the power and the combined output power of the wind farm system; the database for storing and managing various data of the wind farm operation system; and the aforementioned wind farm operation control device.

In the embodiment of the present invention, the target power of the combined wind-storage output is constantly adjusted, and the charging and discharging power of the energy storage system is recalculated to predict the remaining capacity of the energy storage system at the next moment, so as to meet the requirements of prediction accuracy and ensure storage capacity. The safety margin of the energy storage system at the next moment is taken as the premise, and the charging and discharging power of the energy storage system is finally determined. Therefore, the combined wind storage output power of the wind farm system can be accurately controlled, and the deviation between the wind storage combined output power and the predicted power can be reduced.

Description of drawings

FIG. 1 is an overall block diagram showing a wind farm system according to one embodiment of the present invention.

Fig. 2 is a block diagram showing a wind farm operation control device according to an embodiment of the present invention.

Fig. 3 is a schematic diagram illustrating a wind farm operation control process according to an embodiment of the present invention.

Fig. 4 is a flow chart showing wind farm operation control processing according to one embodiment of the present invention.

Fig. 5 is a flow chart showing charging and discharging power correction processing of the energy storage system according to an embodiment of the present invention.

detailed description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

(first embodiment)

FIG. 1 is an overall block diagram showing a wind farm system according to one embodiment of the present invention.

As shown in FIG. 1 , a wind farm system 1 equipped with an energy storage system may include, for example, a wind farm 10 , a wind power prediction system 20 , a battery energy storage system 30 , a database 40 and a wind farm operation control device 50 .

Among them, the wind farm 10 is a power plant that utilizes wind power to generate electricity, and outputs wind power. For example, a data collection mechanism not shown in the figure may be installed in the wind farm to collect wind power data.

The wind power forecasting system 20 has the function of predicting wind power, and can analyze and predict the power generated by wind farms within a certain operating time in advance, for example, according to meteorological conditions and/or statistical laws and other parameters, establish a wind power forecasting model, and provide wind power forecasting data.

The battery energy storage system 30 is a system that provides backup power in the wind power generation system, and is used to compensate wind power prediction errors. Here, although not shown, the battery energy storage system 30 includes: a storage battery, a battery management system (BMS), a power conversion system (PCS), and a central control system (not shown). The BMS can collect the state of charge (State of Charge, or SOC) of the battery pack, also known as the remaining capacity of the battery. PCS can manage the charge and discharge of the battery according to the control strategy.

The database 40 is a module for storing and managing data. For example, it may include a memory for storing and managing data collected and required by various parts of the wind farm system, so as to facilitate data sharing and calling among various modules.

Wherein, the data categories stored in the database 40 may include at least some of the following data, for example:

Data collection: wind power prediction power Wind power output power Battery remaining capacity SOC ^(k) .

Among them, the wind power forecast power The wind power forecasting system 20, for example, analyzes and predicts the power generated by the wind farm within a certain operating period in advance according to meteorological conditions and/or statistical laws and other parameters, and provides wind power forecast data by establishing a wind power forecasting model; wind power output power is the wind power output by the wind farm 10 using wind power.

Initial data: time resolution Δt, power adjustment step Δp, battery safety capacity Q _rel , margin coefficient a%, wind power plant power prediction allowable error b%, nominal capacity of battery energy storage system Q _r , remaining capacity SOC, remaining Capacity maximum SOC _max and minimum SOC _min , maximum and minimum discharge power and Maximum and minimum charging power and

Among them, the maximum remaining capacity SOC _max of the battery is the threshold set to prevent the battery from overcharging, and the minimum remaining capacity SOC _min is the threshold set to prevent the battery from over-discharging. When the remaining capacity of the battery exceeds the maximum SOC _max or is lower than In the case of the minimum SOC _min , it will cause irreversible damage to the battery, which not only affects the service life of the battery, but may also pose a safety hazard sometimes.

Calculation data: target power of wind storage synthesis output Battery safety margin SOC ₀ , battery charging and discharging power

Among them, the target power of wind storage synthesis output is the actual output power of the wind farm system equipped with an energy storage system, according to the wind power output power of the wind farm 10 and the charging and discharging power provided by the energy storage system are obtained. In addition, the battery safety margin SOC ₀ is the safety margin of the remaining battery capacity that can compensate for wind power forecasting errors, which can be obtained through the normal distribution method or empirical values, and the margin coefficient can also be adjusted according to actual needs a%.

The wind farm operation control device 50 is used to control the charging and discharging of the energy storage system according to the predicted data of wind power generation during the operation of the wind farm, so as to compensate the deviation between the actual power generated by the wind farm and the predicted power. In the wind farm operation control device 50, the charging and discharging power of the battery is calculated according to the predicted power of wind power, the actual output power of wind power and the remaining capacity of the battery, which can reduce the error between the combined output power of wind storage and the predicted power of wind power, and at the same time ensure that the battery is sufficient To reduce the risk of wind power output exceeding the rated range in the later period.

In addition, in one embodiment, the wind farm operation control device 50 includes, for example, an initial value setting unit 51 and an energy storage system control unit 52 . The initial value setting unit 51 sets the maximum output power and the minimum output power when the wind-storage combined output of the wind farm system satisfies the allowable prediction error, for example, according to the wind power prediction power and the allowable prediction error. The energy storage system control unit 52, for example, predicts the remaining capacity of the energy storage system at the next moment based on the target power of the combined output of wind storage and the actual wind power output of the wind farm, and according to the predicted capacity of the energy storage system at the next moment The remaining capacity adjusts the target power of the combined wind storage output at the current moment and controls the charging and discharging power of the energy storage system.

As shown in FIG. 2 , according to an embodiment, the energy storage system control unit 52 may include, for example, a charge and discharge power calculation unit 521 , a remaining capacity prediction unit 522 , and a wind storage combined output target power adjustment unit 523 . Wherein, the charging and discharging power calculation unit 521 calculates the charging and discharging power of the battery. The remaining capacity prediction unit 522 predicts the remaining capacity of the battery at the next moment based on the charge and discharge power calculated by the charge and discharge power calculation unit 521 . The wind storage output target power adjustment unit 523 adjusts the wind storage output target power according to the remaining capacity of the battery at the next moment predicted by the remaining capacity prediction unit. In addition, the energy storage system control unit 52 may further include, for example, a charge and discharge power correction unit 524 , and the charge and discharge power correction unit 524 corrects the charge and discharge power calculated by the charge and discharge power calculation unit as required.

Generally speaking, the wind farm operation control device according to an embodiment of the present invention predicts the remaining capacity of the battery at the next moment, and continuously adjusts the target power of the combined wind-storage output according to the predicted remaining capacity of the battery at the next moment. After the wind-storage synthesis and output target power is recalculated and the battery charge and discharge power is controlled until the specified conditions are met.

In this embodiment, because the target power of the wind-storage synthesis output is constantly adjusted within the allowable range of the prediction error according to the predicted remaining capacity of the battery at the next moment, it can reduce the inability to meet the requirements of the prediction error accuracy in the later stage and the wind-storage synthesis output. The risk of output exceeding the rated range can continuously provide accurate reference data for relevant dispatching departments to formulate power generation plans to avoid waste of resources.

The process of wind farm operation control processing will be described in detail below with reference to the accompanying drawings. (A) to (E) of FIG. 3 show schematic diagrams of wind farm operation control processing.

As shown in (A) of Figure 3, the upper and lower solid lines in the figure respectively represent the predicted power of the wind farm and the actual output power of the wind farm The dotted lines represent the maximum and minimum power output values P _max and P _min of the combined output of wind storage when the allowable error b% of the power prediction of the wind power plant is satisfied. First, let the wind-storage synthesis output target power be equal to the predicted power Then, based on the predicted power of the wind farm and the actual output power of the wind farm Calculate the charging and discharging power that needs to be provided by the battery Then, for example, the remaining capacity of the battery at the next moment is estimated based on the remaining capacity of the battery at the current moment, the charging and discharging power of the battery, the time resolution Δt, and the nominal capacity of the battery _Qr $({\mathrm{SOC}}_{e\mathrm{the\; s}t}^{(k+1)}={\mathrm{SOC}}^{\left(k\right)}-P_b^{\left(k\right)}\×\mathrm{\Δ}t/Q_r).$

As shown in (B) of Figure 3, if the estimated remaining capacity of the battery at the next moment is above the safety margin and below the maximum remaining capacity Then the wind storage combined output target power is not adjusted, and the wind storage combined output target power is the actual wind storage combined output power. In this case, it can not only realize that the combined output power of wind storage is equal to the predicted power of wind power (that is, the prediction error is zero), but also reduce the risk that the combined output power of wind storage will exceed the rated range in the later period, and the remaining capacity of the battery cannot compensate for the wind power prediction error. .

As shown in (C) of Figure 3, if the estimated remaining capacity of the battery at the next moment is greater than the maximum remaining capacity of the battery Then increase the combined wind-storage output target power according to the predetermined power adjustment step Δp each time, recalculate the charging and discharging power of the battery, and re-estimate the remaining capacity of the battery at the next moment, so as to repeat the adjustment until or until.

As shown in (D) of Figure 3, if the estimated remaining capacity of the battery at the next moment satisfies relationship, each time the target value of wind power output is reduced according to the predetermined power adjustment step Δp, and the charging and discharging power of the battery is recalculated, and the remaining capacity of the battery at the next moment is re-estimated, and the adjustment is repeated until or until.

As shown in (E) of Figure 3, if the estimated remaining capacity of the battery at the next moment satisfies relationship, the battery charge and discharge power is calculated as $P_b^{\left(k\right)}=$ $({\mathrm{SOC}}^{\left(k\right)}-{\mathrm{SOC}}_{mi\mathrm{no}})\×Q_r/\mathrm{\Δ}t.$

Hereinafter, the flow of the wind farm operation control process of the present invention will be described with reference to FIG. 4 .

When the wind farm is running, in step S201, the remaining capacity required by the energy storage system to compensate for wind power prediction errors is obtained as a safety margin of the energy storage system (SOC ₀ =a%*Qrel/Qr). Calculate the maximum wind-storage combined output power according to the predicted power and the allowable error of power prediction and minimum make Go to step S202.

In step S202, according to the predicted power of the wind farm and the actual output power of the wind farm Calculate the charge and discharge power required to be provided by the battery Then, according to the remaining capacity of the battery at the current moment, the charging and discharging power of the battery, the time resolution Δt and the nominal capacity of the battery _Qr , the remaining capacity of the battery at the next moment is estimated ${\mathrm{SOC}}_{e\mathrm{the\; s}t}^{(k+1)}={\mathrm{SOC}}^{\left(k\right)}-P_b^{\left(k\right)}\×\mathrm{\Δ}t/Q_r,$ Go to step S203.

In step S203, judge and estimate the remaining capacity of the battery at the next moment Relationship with SOC ₀ , SOC _max , if satisfied (Step S203: Yes), go to processing A, otherwise go to step S204.

In step S204, further judge and estimate the remaining capacity of the battery at the next moment Relationship with SOC _max , at When (step S204: yes), in step S205, make Then go to step S206. in dissatisfaction When (step S204: No), in step S208 make Go to step S209.

In step S206, it is judged and relationship, in , in step S207 make Otherwise, go to step S202. The flow proceeds to processing A after step S207.

In addition, in step S209, it is judged that and relationship, in , go to step S210, otherwise go to step S202.

Then, in step S210, it is judged that Relationship with SOC _min . exist , enter step S211 to make the charging and discharging power of the battery and go to process A. If it is judged in step S210 that it is not satisfied Then enter step S212, make and go to process A.

Hereinafter, specific technical effects of the present invention will be described with reference to the flowchart of FIG. 4 .

In step S204, it is determined that the estimated remaining capacity of the battery at the next moment satisfies When the relationship between , it means that the battery can provide more electricity for the combined output of the wind storage system. Therefore, in this embodiment, in step S205, within the range of ensuring the allowable error of b% of the prediction, gradually increase The target power of the combined output of wind storage can maximize the combined output of the wind storage system and effectively utilize wind resources and energy storage systems.

On the other hand, the estimated remaining capacity of the battery at the next moment satisfies , it means that the battery will be in a certain unreliable state at the next moment. In the present invention, by gradually increasing the target power of wind-storage synthesis output in step S205, even if the battery outputs as much power as possible, it can also make the battery in the next step S205. It becomes a reliable state or closer to a reliable state for a moment, thus greatly reducing the risk of the wind storage synthesis output exceeding the rated range in the later stage.

In addition, in step S204, if not satisfied That is, the estimated remaining capacity of the battery at the next moment satisfies (include ${\mathrm{SOC}}_{\min }\&le;{\mathrm{SOC}}_{\mathrm{est}}^{(k+1)}<{\mathrm{SOC}}_0$ or ${\mathrm{SOC}}_{\mathrm{est}}^{(k+1)}<{\mathrm{SOC}}_{\min }$ The relationship between these two cases) shows that if the current target power of wind-storage synthesis output is used as the actual wind-storage synthesis output power, the safety margin of the battery will not be guaranteed at the next moment, and even the battery’s own power will be destroyed. reliability. In order to avoid this situation, in the present invention, the target power of the wind-storage synthesis output is gradually reduced according to the predetermined step size within the scope of ensuring the prediction allowable error b%, and as much electricity as possible is stored in the battery, so that the next The remaining capacity of the battery at all times meets the safety margin or is as close to the safety margin as possible. Therefore, according to the present invention, it not only ensures that the prediction accuracy is within the allowable error range, but also takes into account the safety margin of the battery at the next moment to the greatest extent, thereby greatly reducing the risk that the combined output of wind storage in the later stage will exceed the rated range.

Furthermore, in the present invention, the target value of wind power output is reduced each time according to the predetermined power adjustment step size Δp so that in step S209 condition, if it is further determined that the remaining capacity of the battery at the next moment satisfies relationship, it means that the safety margin of the battery cannot be guaranteed at the next moment, and it will affect the reliability of the guaranteed battery. In this case, in the present invention, the safety margin of the battery is no longer considered simply, but the charging and discharging power of the battery is calculated as $P_b^{\left(k\right)}=({\mathrm{SOC}}^{\left(k\right)}-{\mathrm{SOC}}_{mi\mathrm{no}})\&times;Q_r/\mathrm{\&Delta;}t,$ That is to say, all the capacity above the minimum remaining capacity of the battery, SOC _min , is used for wind-storage synthesis output, so as to ensure the reliability of the battery itself and maximize the actual wind-storage synthesis output power. On the other hand, the remaining capacity of the battery at the next moment is not satisfied In the case of the condition, the charging and discharging power of the battery So that it can meet the allowable range of prediction error.

Hereinafter, the processing A will be described in detail.

Processing A is to determine the charging and discharging power of the battery Afterwards, it is a correction process to ensure that the remaining capacity of the battery and the charging and discharging power do not exceed its range. The start of the process A corresponds to step S213.

In step S213, it is judged that relation to 0 if Go to step S214, otherwise go to step S215.

Judging in step S214 and relationship, in , the battery energy storage system stops discharging, otherwise, enter step S216.

Judging in step S216 and relationship, in season Otherwise, go to step S218.

In step S218, the relationship between SOC and SOC _min is judged, and when SOC>SOC _min , the battery energy storage system is controlled to discharge On the contrary, the discharge of the battery energy storage system stops.

Judging in step S215 and relationship, in , the battery energy storage system stops discharging, otherwise, enter step S217. in, Indicates the minimum discharge power of the battery.

Judging in step S217 and relationship, in season Otherwise, go to step S219. in, Indicates the maximum discharge power of the battery.

In step S219, the relationship between SOC and SOC _max is judged, and when SOC<SOC _max , the battery energy storage system is controlled to charge Otherwise, the charging of the battery energy storage system stops.

Through processing A, the charging and discharging power of the battery is corrected according to the maximum and minimum charging and discharging power and remaining capacity of the battery itself, so as to ensure that the remaining capacity and charging and discharging power of the battery do not exceed its rated range.

The above describes the wind farm operation control device and the wind farm operation control method of the present invention. Those skilled in the art should understand that multiple aspects of the present invention can be embodied as systems, methods or computer program products. Thus, aspects of the present invention may be entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of software and hardware portions referred to as "units" or "systems" in this specification. combination. Furthermore, aspects of the present invention may take the form of a computer program product embodied in one or more computer-readable media having computer-usable program code embodied therein. For example, the energy storage system control unit in the wind farm operation control device can be realized by a hardware circuit with corresponding functions, or by a computer executing a program that records the corresponding functions. In addition, the corresponding programs may be preloaded in a computer-readable storage medium (ROM or storage unit) and provided, or may be distributed or downloaded via a network such as a LAN or the Internet.

Although the embodiment of the present invention has been described, the embodiment is only an illustration and is not intended to limit the scope of the invention. Those skilled in the art can understand that the embodiments can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and its equivalent scope.

Claims (21)

1. A wind farm operation control device, applied to a wind farm system provided with an energy storage system, the wind farm operation control device is characterized in that it has: The initial value setting unit is configured to set the maximum output power and the minimum output power when the combined wind-storage output of the wind farm system satisfies the allowable prediction error according to the wind power prediction power and the allowable prediction error; and The energy storage system control unit predicts the remaining capacity of the energy storage system at the next moment according to the target power of the wind-storage synthesis output and the actual wind power output of the wind farm, and according to the predicted remaining capacity of the energy storage system at the next moment Capacity, adjust the target power of the wind storage synthesis output at the current moment, and control the charging and discharging power of the energy storage system. 2. The wind farm operation control device according to claim 1, characterized in that, The energy storage system control unit has: A charging and discharging power calculation unit, which calculates the charging and discharging power of the energy storage system required at each moment; The remaining capacity prediction unit predicts the remaining capacity of the energy storage system at the next moment according to the charging and discharging power calculated by the charging and discharging power calculation unit; The target power adjustment unit of combined output of wind storage adjusts the target power of combined output of wind storage according to the remaining capacity of the energy storage system at the next moment predicted by the remaining capacity prediction unit. 3. The wind farm operation control device according to claim 2, characterized in that, The initial value setting unit also obtains the remaining capacity required by the energy storage system to compensate for wind power prediction errors as a safety margin of the energy storage system. 4. The wind farm operation control device according to claim 3, characterized in that, In the energy storage system control unit, When the remaining capacity of the energy storage system at the next moment predicted by the remaining capacity prediction unit is greater than or equal to the safety margin and less than or equal to the maximum remaining capacity of the energy storage system, the wind-storage composite output The target power adjustment unit does not adjust the target power of the combined wind storage output. 5. The wind farm operation control device according to claim 3, characterized in that, In the energy storage system control unit, When the remaining capacity of the energy storage system at the next moment predicted by the remaining capacity prediction unit is greater than the maximum remaining capacity of the energy storage system, the target power adjustment unit of the combined wind-storage output adjusts the wind-storage The target power of the synthesized output is increased by a specified value each time, and the charging and discharging power is recalculated by the charging and discharging power calculation unit, and the remaining capacity of the energy storage system at the next moment is re-predicted by the remaining capacity prediction unit , until the target power of the combined wind-storage output exceeds the maximum output power or the remaining capacity of the energy storage system re-predicted by the remaining capacity prediction unit at the next moment is less than the safety margin of the energy storage system until. 6. The wind farm operation control device according to claim 3, characterized in that, In the energy storage system control unit, When the remaining capacity of the energy storage system at the next moment predicted by the remaining capacity prediction unit is greater than or equal to the minimum remaining capacity of the energy storage system and less than the safety margin, the target of the combined wind-storage output The power adjustment unit reduces the target power of the combined output of the wind storage by a specified amount each time, and recalculates the charging and discharging power through the charging and discharging power calculation unit, and re-predicts the storage capacity through the remaining capacity prediction unit. The remaining capacity of the energy storage system at the next moment, until the target power of the combined wind storage output is less than the minimum output power or the remaining capacity of the energy storage system re-predicted by the remaining capacity prediction unit is greater than up to the safety margin of the energy storage system. 7. The wind farm operation control device according to claim 6, characterized in that, In the case where the target power adjustment unit of the wind-storage combined output reduces the target power of the wind-storage combined output by a prescribed amount each time and the target power of the wind-storage combined output is smaller than the minimum output power, If the remaining capacity of the energy storage system re-predicted by the remaining capacity prediction unit at the next moment is less than the minimum remaining capacity, the charging and discharging power calculation unit The difference between the capacity and the minimum remaining capacity is used to calculate the charging and discharging power of the energy storage system. 8. The wind farm operation control device according to claim 2, characterized in that: The energy storage system control unit further includes a charge and discharge power correction unit for correcting the charge and discharge power calculated by the charge and discharge power calculation unit. 9. The wind farm operation control device according to claim 8, characterized in that: When the absolute value of the charging and discharging power of the energy storage system calculated by the charging and discharging power calculation unit is smaller than the absolute value of the minimum charging and discharging power of the energy storage system, the charging and discharging power correction unit will charge The discharge power is corrected to zero, When the absolute value of the charging and discharging power of the energy storage system calculated by the charging and discharging power calculation unit is greater than the absolute value of the maximum charging and discharging power of the energy storage system, the charging and discharging power correction unit The charging and discharging power of the energy storage system is corrected to the maximum charging and discharging power of the energy storage system, When the remaining capacity of the energy storage system at the current moment is less than or equal to the minimum remaining capacity of the energy storage system, the charging and discharging power correction unit corrects the discharging power to zero, and the energy storage system at the current moment When the remaining capacity of is greater than or equal to the maximum remaining capacity of the energy storage system, the charging and discharging power correction unit corrects the charging power to zero. 10. The wind farm operation control device according to any one of claims 1 to 9, characterized in that, The energy storage system is a battery energy storage system. 11. A wind farm operation control method, applied to a wind farm system equipped with an energy storage system, the wind farm operation control method is characterized in that it includes: The initial value setting step is to set the maximum output power and the minimum output power when the combined wind storage output of the wind farm system meets the allowable prediction error according to the wind power prediction power and the allowable prediction error; and The energy storage system control step is to predict the remaining capacity of the energy storage system at the next moment according to the target power of the combined output of wind storage and the actual wind power output power of the wind farm, and according to the predicted remaining capacity of the energy storage system at the next moment Capacity, adjust the target power of the wind storage synthesis output at the current moment, and control the charging and discharging power of the energy storage system. 12. The wind farm operation control method according to claim 11, characterized in that: The control steps of the energy storage system include: A charging and discharging power calculation step, calculating the charging and discharging power of the energy storage system required at each moment; The remaining capacity prediction step is to predict the remaining capacity of the energy storage system at the next moment according to the charging and discharging power calculated in the charging and discharging power calculating step; The step of adjusting the target power of the combined wind-storage output is to adjust the target power of the combined wind-storage output according to the remaining capacity of the energy storage system at the next moment predicted by the remaining capacity prediction step. 13. The wind farm operation control method according to claim 12, characterized in that: In the initial value setting step, the remaining capacity required by the energy storage system to compensate for wind power prediction errors is also obtained as a safety margin of the energy storage system. 14. The wind farm operation control method according to claim 13, characterized in that: In the energy storage system control step, When the remaining capacity of the energy storage system at the next moment predicted by the remaining capacity predicting step is greater than or equal to the safety margin and less than or equal to the maximum remaining capacity of the energy storage system, the combined wind-storage output The target power of the combined wind-storage output is not adjusted in the target power adjustment step. 15. The wind farm operation control method according to claim 13, characterized in that: In the energy storage system control step, When the remaining capacity of the energy storage system at the next moment predicted by the remaining capacity prediction step is greater than the maximum remaining capacity of the energy storage system, in the step of adjusting the target power of the combined wind-storage output, the The target power of the combined wind-storage output is increased by a specified value each time, and the charging and discharging power is recalculated through the charging and discharging power calculation step, and the next moment of the energy storage system is re-predicted through the remaining capacity prediction step remaining capacity, until the target power of the combined wind-storage output exceeds the maximum output power or the remaining capacity of the energy storage system re-predicted by the remaining capacity prediction step at the next moment is less than the safety of the energy storage system up to the margin. 16. The wind farm operation control method according to claim 13, characterized in that, In the energy storage system control step, When the remaining capacity of the energy storage system at the next moment predicted by the remaining capacity predicting step is greater than or equal to the minimum remaining capacity of the energy storage system and less than the safety margin, the wind-storage composite output In the target power adjustment step, the target power of the combined output of the wind storage is reduced by a specified value each time, and the charging and discharging power is recalculated through the charging and discharging power calculation step, and the remaining capacity prediction step is re-predicted. The remaining capacity of the energy storage system at the next moment, until the target power of the combined wind storage output is less than the minimum output power or the remaining capacity of the energy storage system at the next moment re-predicted by the remaining capacity prediction step until the capacity is greater than the safety margin of the energy storage system. 17. The wind farm operation control method according to claim 16, characterized in that: When the target power of the wind-storage combined output is reduced by a prescribed amount each time in the step of adjusting the target power of the wind-storage combined output and the target power of the wind-storage combined output is smaller than the minimum output power, If the remaining capacity of the energy storage system re-predicted by the remaining capacity prediction step at the next moment is less than the minimum remaining capacity, then in the charging and discharging power calculation step, according to the current moment of the energy storage system The difference between the remaining capacity and the minimum remaining capacity is used to calculate the charging and discharging power of the energy storage system. 18. The wind farm operation control device according to claim 12, characterized in that: The control step of the energy storage system further includes a charging and discharging power correction step of correcting the charging and discharging power calculated in the charging and discharging power calculation step. 19. The wind farm operation control device according to claim 18, characterized in that: When the absolute value of the charging and discharging power of the energy storage system calculated by the charging and discharging power calculation step is less than the absolute value of the minimum charging and discharging power of the energy storage system, in the charging and discharging power correction step Correct the charging and discharging power to zero, When the absolute value of the charging and discharging power of the energy storage system calculated by the charging and discharging power calculation step is greater than the absolute value of the maximum charging and discharging power of the energy storage system, in the charging and discharging power correction step correcting the charging and discharging power of the energy storage system to the maximum charging and discharging power of the energy storage system, In the case that the remaining capacity of the energy storage system at the current moment is less than or equal to the minimum remaining capacity of the energy storage system, the discharge power is corrected to zero in the charging and discharging power correction step. If the remaining capacity of the energy storage system is greater than or equal to the maximum remaining capacity of the energy storage system, the charging power is corrected to zero in the step of correcting the charging and discharging power. 20. The wind farm operation control method according to any one of claims 11 to 19, characterized in that, The energy storage system is a battery energy storage system. 21. A wind farm system, characterized in that it has: wind power plant; The wind power prediction device establishes a wind power prediction model according to meteorological conditions and statistical laws, and outputs the wind power prediction power; The energy storage system is charged and discharged to compensate for the error between the predicted wind power and the combined output power of the wind farm system; a database for storing and managing various data of the wind farm operation system; and The wind farm operation control device according to any one of claims 1 to 10.