Control method, device and system for wind storage hybrid networking and storage medium

Abstract

The invention discloses a control method, device and system for wind storage hybrid network construction, and a storage medium, which are used for improving the reliability and energy utilization efficiency of a new energy power generation system under a weak power grid condition or an isolated power grid condition. The method comprises the steps that the working state of a network-forming type energy storage device in a new energy system is obtained, and the new energy system at least comprises the network-forming type energy storage device and a fan set; when the network construction type energy storage is in a normal working state, the network construction type energy storage is controlled to work in a network construction mode, and the network construction type energy storage balances supply and demand fluctuation of the new energy system on the basis of meeting energy storage; and controlling the net construction type fan set to work in a net following mode, and carrying out load following by the fan set while the net construction type energy storage balances supply and demand fluctuations of the new energy system. According to the scheme, the reliability and the energy utilization efficiency of the new energy system are improved.

Description

Technical Field

[0001] This application relates to the technical field of operation control of new energy power generation systems, and particularly relates to a control method, device, system, and storage medium for a wind-storage hybrid grid-forming system. Background Art

[0002] A new energy system refers to a power system mainly composed of renewable energy sources (such as photovoltaic and wind power) combined with technologies such as energy storage. Grid-forming technology provides active voltage and frequency support for the new energy system and is an important part of the new power system. With the development of the new energy system, grid-forming devices need to reserve more energy to meet system requirements. Currently, although grid-forming converters have been applied in 100% new energy microgrids or isolated grid systems, mainly grid-forming energy storage solutions are adopted. In a system with a single energy storage grid-forming source, the system highly depends on the energy storage. Once the energy storage fails, the reliability of the entire system will be severely affected. In addition, under the dual-high characteristics of the new power system, grid-forming new energy power stations need to reserve sufficient energy, but excessive reservation will lead to low energy utilization efficiency and poor economy of the equipment, while insufficient reservation will result in poor anti-disturbance ability of the system.

[0003] Therefore, how to provide a control method for a wind-storage hybrid grid-forming system to improve the reliability and energy utilization efficiency of the new energy system has become an urgent technical problem to be solved. Summary of the Invention

[0004] This application provides a control method, device, system, and storage medium for a wind-storage hybrid grid-forming system to improve the reliability and energy utilization efficiency of the new energy system.

[0005] This application provides a control method for a wind-storage hybrid grid-forming system, including: Obtaining the working state of the grid-forming energy storage in the new energy system, where the new energy system includes at least a grid-forming energy storage and a wind turbine group; When the grid-forming energy storage is in a normal working state, controlling the grid-forming energy storage to work in the grid-forming mode, where when the grid-forming energy storage works in the grid-forming mode, the grid-forming energy storage balances the supply-demand fluctuations of the new energy system on the basis of meeting energy reserves; Controlling the grid-forming wind turbine group to work in the grid-following mode, and while the grid-forming energy storage balances the supply-demand fluctuations of the new energy system, the grid-forming wind turbine group performs load following.

[0006] The beneficial effects of this application are as follows: When the grid-forming energy storage operates normally, it is controlled to work in the grid-forming mode while the grid-forming wind turbine operates in the grid-following mode, thus avoiding the system's high dependence on energy storage and improving the reliability of the new energy system. Moreover, based on meeting the energy reserve, the grid-forming energy storage balances the supply-demand fluctuations of the new energy system, and the grid-forming wind turbine performs load following. Therefore, the grid-forming energy storage and the grid-forming wind turbine find a better balance point between energy reservation and participating in system load regulation, avoiding energy waste caused by excessive energy reservation and improving the energy utilization efficiency of the equipment. In summary, through the collaborative work of the grid-forming energy storage and the grid-forming wind turbine, this application, while ensuring the ability to support system voltage and frequency, achieves the dual goals of strong grid support and efficient energy utilization through load regulation optimization, improving the reliability of the new energy system and the energy utilization efficiency.

[0007] In one embodiment, the method further includes: When a system disturbance occurs, instantaneous support is provided by the grid-forming energy storage to compensate for the system disturbance; In the case where the instantaneous support provided by the grid-forming energy storage cannot completely eliminate the system disturbance, the grid-forming energy storage and the wind turbine enter primary frequency modulation to further eliminate the system disturbance.

[0008] In one embodiment, the strategy for the grid-forming energy storage to balance the supply-demand fluctuations of the new energy system based on meeting the energy reserve is as follows: When P Ga +P Fa -P L > ξ1, (ξ1 > 0), the grid-forming energy storage is charged, where the charging power satisfies the following conditions: |P E | < P Ga +P Fa -P L , |P E | ≤ maximum charging power - kPn; When P Ga +P Fa -P L < ξ2, (ξ1 > ξ2 > 0), the grid-forming energy storage is discharged, where the discharging power satisfies the following conditions: |P E | ≤ P L , |P E | < maximum discharging power - kPn; Wherein, P E is the energy storage power; P Ga is the available power of the grid-following unit; P Fa is the available power of the grid-forming unit;L is the power required by the system; ξ1 and ξ2 are preset power margins; Pn is the maximum capacity of the system; k is the reserved energy coefficient.

[0009] In one embodiment, the strategy for the wind turbine group to follow the load is as follows: Obtain the power of the grid-forming energy storage and the load power according to the system power balance relationship; Calculate the target power value of the wind turbine group according to the power of the grid-forming energy storage and the load power; Control the wind turbine group to follow the load according to the power target value.

[0010] In one embodiment, the wind turbine group includes a grid-forming wind turbine group and a grid-following wind turbine group, and the method further includes: When the grid-forming energy storage fails, control the grid-forming wind turbine group to switch to the grid-forming mode. Among them, after the grid-forming wind turbine group switches to the grid-forming mode, the grid-forming wind turbine group participates in the load support of a preset proportion on the basis of ensuring energy reserve, and the remaining load support is balanced by the grid-following wind turbine group.

[0011] The beneficial effect of this embodiment is that when the grid-forming energy storage fails, the grid can be formed by the grid-forming wind turbine group, so as to flexibly adjust the grid-forming equipment according to the grid operation state, avoiding the situation of grid system paralysis caused by the failure of the grid-forming energy storage and increasing the robustness.

[0012] In one embodiment, the method further includes: When the reason for the failure of the grid-forming energy storage is that the state of charge of the grid-forming energy storage exceeds the normal range, control the grid-forming energy storage to recover the state of charge.

[0013] In one embodiment, the strategy for controlling the grid-forming energy storage to recover the state of charge is as follows: When the state of charge is lower than the first preset value, charge the grid-forming energy storage. The first preset value is the minimum value of the normal state-of-charge range of the grid-forming energy storage, and the charging power of the grid-forming energy storage satisfies the following conditions: |PE| < P Ga +P Fa -P L -kPn, |PE| ≤ maximum charging power; When the state of charge is higher than the second preset threshold, discharge the energy storage. The second preset value is the maximum value of the normal state-of-charge range of the grid-forming energy storage, and the discharge power of the grid-forming energy storage satisfies the following conditions: |PE| ≤ PL, |PE| < maximum discharge power; Among them, the P E is the energy storage power; P Ga is the available power of the grid-following unit; PFa is the available power of the network-forming unit; P L is the power required by the system; Pn is the maximum capacity of the system; k is the reserved energy coefficient.

[0014] This application also provides a control device for a wind-storage hybrid network-forming system, including: An acquisition module, configured to acquire the working state of the network-forming energy storage in the new energy system, where the new energy system at least includes a network-forming energy storage and a wind turbine group; A first control module, configured to control the network-forming energy storage to operate in a network-forming mode when the network-forming energy storage is in a normal working state. When the network-forming energy storage operates in the network-forming mode, the network-forming energy storage balances the supply-demand fluctuations of the new energy system on the basis of meeting energy reserve; A second control module, configured to control the network-forming wind turbine group to operate in a grid-following mode. While the network-forming energy storage balances the supply-demand fluctuations of the new energy system, the network-forming wind turbine group performs load following.

[0015] In one embodiment, the device further includes: A support module, configured to provide instantaneous support through the network-forming energy storage to compensate for system disturbances when the system is disturbed; A frequency modulation module, configured to enter primary frequency modulation through the network-forming energy storage and the network-forming wind turbine group to further eliminate system disturbances when the instantaneous support provided by the network-forming energy storage cannot completely eliminate the system disturbances.

[0016] In one embodiment, the strategy for the network-forming energy storage to balance the supply-demand fluctuations of the new energy system on the basis of meeting energy reserve is as follows: When P Ga +P Fa -P L > ξ1, (ξ1 > 0), charge the network-forming energy storage, where the charging power satisfies the following conditions: |P E | < P Ga +P Fa -P L , |P E | ≤ maximum charging power - kPn; When P Ga +P Fa -P L < ξ2, (ξ1 > ξ2 > 0), discharge the network-forming energy storage, where the discharging power satisfies the following conditions: |P E | ≤ P L , |P E | < maximum discharging power - kPn; Among them, P E is the energy storage power; P Ga is the available power of the grid-following unit; P Fa is the available power of the grid-forming unit; P L is the power required by the system; ξ1 and ξ2 are preset power margins; Pn is the maximum capacity of the system; k is the reserved energy coefficient.

[0017] In one embodiment, the strategy for the wind turbine set to follow the load is as follows: Obtain the power of the grid-forming energy storage and the load power according to the system power balance relationship; Calculate the target power value of the wind turbine set according to the power of the grid-forming energy storage and the load power; Control the wind turbine set to follow the load according to the power target value.

[0018] In one embodiment, the device further includes: A switching module, configured to control the grid-forming wind turbine set to switch to the grid-forming mode when the grid-forming energy storage has an abnormality. Among them, after the grid-forming wind turbine set switches to the grid-forming mode, the grid-forming wind turbine set participates in the load support with a preset ratio on the basis of ensuring energy reserve, and the remaining load support is balanced by the grid-following wind turbine set.

[0019] In one embodiment, the device further includes: A recovery module, configured to control the grid-forming energy storage to perform charge recovery when the reason for the abnormality of the grid-forming energy storage is that the state of charge of the grid-forming energy storage exceeds the normal range.

[0020] In one embodiment, the strategy for controlling the grid-forming energy storage to perform charge recovery is as follows: When the state of charge is lower than the first preset value, charge the grid-forming energy storage. The first preset value is the minimum value of the normal state-of-charge range of the grid-forming energy storage. The charging power of the grid-forming energy storage satisfies the following conditions: |P E | < P Ga + P Fa - P L - kPn, |P E | ≤ the maximum charging power; When the state of charge is higher than the second preset threshold, discharge the energy storage. The second preset value is the maximum value of the normal state-of-charge range of the grid-forming energy storage. The discharging power of the grid-forming energy storage satisfies the following conditions: |P E | ≤ PL, |P E | < the maximum discharging power; Among them, the P E is the energy storage power; P Gais the available power of the grid-following unit; P Fa is the available power of the grid-forming unit; P L is the power required by the system; Pn is the maximum capacity of the system; k is the reserved energy coefficient.

[0021] This application also provides a control system for a wind-storage hybrid grid-forming system, including: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the control method of the wind-storage hybrid grid-forming system described in any of the above embodiments.

[0022] This application also provides a computer-readable storage medium. When the instructions in the storage medium are executed by the processor corresponding to the control system of the wind-storage hybrid grid-forming system, the control system of the wind-storage hybrid grid-forming system can implement the control method of the wind-storage hybrid grid-forming system described in any of the above embodiments.

[0023] Other features and advantages of this application will be described in the subsequent specification, and part of them will become obvious from the specification, or be understood by implementing this application. The objectives and other advantages of this application can be achieved and obtained through the structures specifically pointed out in the written specification, claims, and drawings.

[0024] The following further describes the technical solutions of this application in detail through the drawings and embodiments. Description of the Drawings

[0025] The drawings are used to provide a further understanding of this application, and constitute a part of the specification. They are used together with the embodiments of this application to explain this application, and do not constitute a limitation to this application. In the drawings: Figure 1 is a flowchart of a control method for a wind-storage hybrid grid-forming system in an embodiment of this application; Figure 2 is a system operation diagram of a grid-forming energy storage in a normal state in an embodiment of this application; Figure 3 is a system energy management flowchart of a grid-forming energy storage in a grid-forming mode in an embodiment of this application; Figure 4 is a system operation diagram of a grid-forming energy storage in an abnormal state in an embodiment of this application; Figure 5 is a system energy management flowchart of a grid-forming wind turbine unit in a grid-forming mode in an embodiment of this application; Figure 6It is a strategy flowchart for a wind turbine group with a grid-forming energy storage in the grid-forming mode to follow the load in an embodiment of this application; Figure 7 It is a strategy flowchart for a grid-forming wind turbine group to adjust the load in the grid-forming mode in an embodiment of this application; Figure 8 It is a schematic structural diagram of a control device for a hybrid wind-storage grid-forming in an embodiment of this application; Figure 9 It is a schematic hardware structure diagram of a control system for a hybrid wind-storage grid-forming in an embodiment of this application. Detailed implementation manners

[0026] The following describes the preferred embodiments of this application with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain this application and are not used to limit this application.

[0027] In view of the deficiencies in the prior art, the present invention proposes an energy management strategy for hybrid wind-storage grid-forming complementarity. By diversifying and expanding the grid-forming energy sources, strengthening the system reserve, flexibly adjusting the grid-forming equipment according to the grid operation state, and increasing the robustness. The control method of the present invention mainly switches and coordinates around two basic working modes: (I) Energy storage grid-forming mode: When the grid-forming energy storage is in a normal working state, control this grid-forming energy storage to work in the grid-forming mode. In this mode, the grid-forming energy storage serves as the main voltage and frequency source, and is responsible for actively balancing the supply and demand fluctuations of the new energy system on the basis of meeting its own energy reserve (such as maintaining the SOC within a safe range).

[0028] At the same time, control the grid-forming wind turbine group to work in the grid-following mode. In this mode, the grid-forming wind turbine group follows the grid frequency and voltage established by the grid-forming energy storage, and outputs power according to the system demand or dispatching instruction. Its main task is to follow the load and cooperate with the grid-forming energy storage to jointly meet the system power demand.

[0029] (II) Wind turbine group grid-forming mode: When it is detected that the grid-forming energy storage is in an abnormal state, in order to ensure the continuous and stable operation of the system, the control method will trigger a mode switch. At this time, control the grid-forming wind turbine group to switch from the grid-following mode to the grid-forming mode.

[0030] In this mode, the grid-forming wind turbine group takes over the energy storage to assume the main voltage and frequency support responsibilities and ensure the basic operation of the system. At the same time, take corresponding recovery measures for the abnormal grid-forming energy storage.

[0031] Figure 1 It is a flowchart of a control method for a hybrid wind-storage grid-forming in an embodiment of this application, asFigure 1 As shown, the method can be implemented as the following steps S101 - S103: In step S101, obtain the working state of the network - forming energy storage in the new - energy system, where the new - energy system includes at least the network - forming energy storage and a wind turbine group; In step S102, when the network - forming energy storage is in a normal working state, control the network - forming energy storage to work in the network - forming mode. When the network - forming energy storage works in the network - forming mode, on the basis of meeting energy reserve, the network - forming energy storage balances the supply - demand fluctuations of the new - energy system; In step S103, control the network - forming wind turbine group to work in the grid - following mode. While the network - forming energy storage balances the supply - demand fluctuations of the new - energy system, the network - forming wind turbine group performs load following.

[0032] Obtain the working state of the network - forming energy storage in the new - energy system, where the new - energy system includes at least the network - forming energy storage and a wind turbine group. "Hybrid wind - energy storage network formation" refers to combining a wind turbine group with a network - forming energy storage to jointly build a power - grid system that can operate stably. The hybrid wind - energy storage network - forming system includes at least the network - forming energy storage and a wind turbine group. In addition, the wind turbine group includes at least a network - forming wind turbine group and may also include a grid - following wind turbine group. In this application, the working state of the network - forming energy storage in the new - energy system is monitored in real time to determine whether the current network - forming energy storage is in a normal working state or an abnormal working state. Specifically, preset detections are performed on the network - forming energy storage device. For example, the preset detections include battery charge - discharge state detection, state of charge (SOC) detection of the battery, converter operation state detection, etc. When the battery can be charged and discharged, it is determined that the battery charge - discharge state detection result is that the battery charge - discharge state is normal; when the battery SOC is within a preset SOC range, such as between 10% and 90%, it is determined that the battery SOC detection result is that the battery SOC is normal. Otherwise, when the battery SOC exceeds the preset SOC range, it will cause a limited - support state for the continuous operation of the new - energy system, and it is determined that the battery SOC detection result is that the battery SOC is abnormal; when the temperature, current, voltage, efficiency, and harmonic content of the converter are all within the normal range and meet the dynamic response test, it is determined that the converter operation state detection result is that the converter operation state is normal. When all the detection results of the preset detections are normal, it is determined that the working state of the network - forming energy storage is normal.

[0033] Since the network-forming energy storage uses energy storage devices such as batteries as carriers, the energy reserve is relatively stable and sufficient. As long as the battery is in good condition and has stored electricity, it can reliably output electrical energy when needed. Therefore, when the network-forming energy storage is in the normal working state, the network-forming energy storage is controlled to operate in the network-forming mode. When the network-forming energy storage operates in the network-forming mode, the network-forming energy storage balances the supply and demand fluctuations of the new energy system on the basis of meeting the energy reserve. At this time, the network-forming energy storage converter actively generates the system voltage and frequency reference. On the premise of ensuring its own energy reserve (such as reserving a certain SOC margin to cope with sudden disturbances), the network-forming energy storage actively balances the real-time power supply and demand fluctuations inside the new energy system through charge and discharge operations. At this time, according to the energy reserve and system safety constraints, it adopts a charge and discharge strategy of peak shaving and valley filling.

[0034] When the network-forming energy storage is in the normal working state, while controlling the network-forming energy storage to operate in the network-forming mode, the wind turbine group is controlled to operate in the grid-following mode. While the network-forming energy storage balances the supply and demand fluctuations of the new energy system, the wind turbine group performs load following. At this time, the converter of the wind turbine group tracks the grid frequency and voltage established by the network-forming energy storage and adjusts its power output according to the upper-level dispatching instruction or system load change. Furthermore, the power generation is dynamically adjusted according to the real-time change of the system load, and it cooperates with the energy storage to jointly meet the total power demand of the system.

[0035] Figure 2 This is the system operation diagram of the network-forming energy storage in the normal state in an embodiment of the present application. As Figure 2 shown, when the network-forming energy storage is in the normal state, the network-forming energy storage A operates in the network-forming mode, and both the network-forming wind turbine B and the grid-following wind turbine C are in the grid-following mode. When there is a disturbance in the system, the network-forming energy storage A provides instantaneous active and reactive power support. The load balance on the slow time scale is jointly completed by the wind turbine and the energy storage. Among them, the energy storage mainly performs peak shaving and valley filling on the basis of meeting the energy reserve, and the wind turbine performs load following.

[0036] Figure 3 This is the system energy management flow chart of the network-forming energy storage in the network-forming mode in an embodiment of the present application; as Figure 3 shown, the strategy for the network-forming energy storage to balance the supply and demand fluctuations of the new energy system on the basis of meeting the energy reserve is as follows: During the peak period, the system wind resources are sufficient, and the available power generation is much greater than the system load consumption (that is, the available power of the new energy system exceeds the load power). At this time, the network-forming energy storage is charged (the energy storage power P E <0). Therefore, when P Ga +P Fa -P L > ξ1, (ξ1>0), the network-forming energy storage is charged, where the charging power satisfies the following conditions: |P E |<P Ga +P Fa -P L ,|P E |≤ maximum charging power - kPn; Wherein, P E is the energy storage power; P Ga is the available power of the grid - following unit; P Fa is the available power of the grid - forming unit; P L is the power required by the system; ξ is the preset power margin; Pn is the maximum capacity of the system; k is the reserved energy coefficient.

[0037] It can be understood that if P Ga +P Fa exactly equals P L at this time, it is in the valley - flat period and does not have the charging condition. It is necessary that the available output of the fan is greater than a certain margin of the load before it has the charging condition.

[0038] During the trough period, the wind resources of the system are not enough to support the consumption of the system load (that is, the available power of the new - energy system is less than the load power). At this time, the grid - forming energy storage is discharged (the energy storage power P E > 0). Therefore, when P Ga +P Fa -P L < ξ2, (ξ1>ξ2>0), the grid - forming energy storage is discharged, and the discharge power satisfies the following conditions: |P E |≤P L ,|P E |< maximum discharge power - kPn.

[0039] In one embodiment, to improve the dynamic stability of the system, a fast - response mechanism for system disturbances is provided: when the grid - forming energy storage is in the normal working state and the system is disturbed, the grid - forming energy storage provides instantaneous support to make up for the system disturbance. For example, when there are sudden large increases / decreases in load, voltage dips or frequency offsets caused by line faults, etc., the grid - forming energy storage system in the grid - forming mode can respond quickly and provide instantaneous active and reactive power support. It realizes the rapid suppression of the severe fluctuations of voltage and frequency and reduces the influence of system disturbances. In the case where the instantaneous support provided by the grid - forming energy storage cannot completely eliminate the system disturbance, primary frequency modulation is jointly carried out by the grid - forming energy storage and the fan group to eliminate the system disturbance. At this time, the fan group will adjust the power output according to the detected frequency deviation, cooperate with the energy storage, and jointly undertake the frequency - regulation task to eliminate the system disturbance with a stronger combined force and restore the system balance.

[0040] In addition, in the case where the fan unit includes a network-forming fan unit and a network-following fan unit, when an abnormality occurs in the network-forming energy storage, it can no longer undertake the main network-forming task. Therefore, the network-forming fan unit is controlled to switch to the network-forming mode. After the network-forming fan unit switches to the network-forming mode, the network-forming fan unit participates in load support with a preset proportion on the basis of ensuring energy reserve, and the remaining load support is balanced by the network-following fan unit. At this time, the main purpose of the network-forming energy storage is to restore the normal state of charge. Figure 4 FIG. Figure 4 is a system operation diagram of the network-forming energy storage in an abnormal state in an embodiment of the present application, as Figure 4 shown. At this time, the network-forming fan B operates in the network-forming mode. When a disturbance occurs in the system, the network-forming fan unit provides the main instantaneous active and reactive power support. If its support ability is insufficient, the network-forming fan unit will participate in primary frequency regulation together with other network-following fan units (and even other adjustable resources) in the system to stabilize the system. When the reason for the abnormality of the network-forming energy storage is that the state of charge of the network-forming energy storage exceeds the normal range, the network-forming energy storage is controlled to restore the state of charge. Figure 5 FIG. Figure 5 is a system energy management flow chart of the network-forming fan unit in the network-forming mode in an embodiment of the present application, as Figure 5 shown. The strategy for the network-forming energy storage to restore the state of charge is as follows: when the state of charge is lower than the first preset value, it indicates that the state of charge is too low, and the network-forming energy storage is charged. The first preset value is the minimum value of the normal state-of-charge range of the network-forming energy storage. The charging power of the network-forming energy storage satisfies the following conditions: |PE| < P Ga +P Fa -P L -kPn, |PE| ≤ maximum charging power; When the state of charge is higher than the second preset threshold, it indicates that the state of charge is too high, and the energy storage is discharged. The second preset value is the maximum value of the normal state-of-charge range of the network-forming energy storage. The discharging power of the network-forming energy storage satisfies the following conditions: |PE| ≤ PL, |PE| < maximum discharging power; where, the P E is the energy storage power; P Ga is the available power of the network-following unit; P Fa is the available power of the network-forming unit; P L is the required power of the system; Pn is the maximum capacity of the system; k is the reserved energy coefficient.

[0041] When the energy storage fails, no charge or discharge operation is performed.

[0042] The beneficial effects of the present application are as follows: When the grid-forming energy storage operates normally, the grid-forming energy storage is controlled to operate in the grid-forming mode while the grid-forming wind turbine operates in the grid-following mode, thereby avoiding the system's high dependence on energy storage and improving the reliability of the new energy system. Moreover, on the basis of meeting the energy reserve, the grid-forming energy storage balances the supply-demand fluctuations of the new energy system, and the grid-forming wind turbine performs load following. Thus, the grid-forming energy storage and the grid-forming wind turbine find a better balance between energy reservation and participation in system load regulation, avoiding energy waste caused by excessive energy reservation and improving the energy utilization efficiency of the equipment. In summary, through the collaborative work of the grid-forming energy storage and the grid-forming wind turbine, on the basis of ensuring the ability to support the system voltage and frequency, through load regulation optimization, the dual purposes of strong grid support and efficient energy utilization are achieved, improving the reliability and energy utilization efficiency of the new energy system.

[0043] In one embodiment, the method can also be implemented as the following steps A1 - A2: In step A1, when a disturbance occurs in the system, instantaneous support is provided by the grid-forming energy storage to compensate for the system disturbance. In step A2, in the case where the instantaneous support provided by the grid-forming energy storage cannot completely eliminate the system disturbance, primary frequency modulation is performed by the grid-forming energy storage and the wind turbine to further eliminate the system disturbance.

[0044] In one embodiment, the strategy for the grid-forming energy storage to balance the supply-demand fluctuations of the new energy system on the basis of meeting the energy reserve can be implemented as the following steps B1 - B2: In step B1, when P Ga +P Fa -P L > ξ1, (ξ1 > 0), the grid-forming energy storage is charged, where the charging power satisfies the following conditions: |P E | < P Ga +P Fa -P L , |P E | ≤ maximum charging power - kPn; In step B2, when P Ga +P Fa -P L < ξ2, (ξ1 > ξ2 > 0), the grid-forming energy storage is discharged, where the discharge power satisfies the following conditions: |P E | ≤ P L , |P E | < maximum discharge power - kPn; Wherein, P E is the energy storage power; PGa is the available power of the grid-following unit; P Fa is the available power of the grid-forming unit; P L is the power required by the system; ξ is the preset power margin; Pn is the maximum capacity of the system; k is the reserved energy coefficient.

[0045] In one embodiment, the strategy for the grid-forming wind turbine unit to perform load following can be implemented as the following steps C1 - C3: In step C1, obtain the power of the grid-forming energy storage and the load power according to the system power balance relationship; In step C2, calculate the target power value of the wind turbine unit according to the power of the grid-forming energy storage and the load power; In step C3, control the wind turbine unit to perform load following according to the power target value.

[0046] Figure 6 is the strategy flowchart for the grid-forming energy storage to perform load following of the wind turbine unit in the grid-forming mode in an embodiment of the present application; in this embodiment, obtain the power of the grid-forming energy storage and the load power according to the system power balance relationship. Specifically, the system power balance relationship formula is P W +P E =P L , where P W is the target power value of the wind turbine unit in the grid-following mode, P E is the power of the grid-forming energy storage, P L is the power required by the system. In the isolated power grid application environment, P L is specifically the load power. In the application environment of connecting to an external power grid, P L is the scheduling target value of the dispatching system.

[0047] Therefore, after obtaining the power of the grid-forming energy storage and the load power, the target power value of the wind turbine unit can be calculated according to the power of the grid-forming energy storage and the load power.

[0048] Control the wind turbine unit to perform load following according to the power target value. Specifically, according to the calculated power target value P W , the control system issues this target to the wind turbine unit group. Usually, an advanced control algorithm (such as a PID controller) is used to track this target value, so that the actual total output of the wind turbine unit is as close as possible to P W . In a wind farm composed of multiple wind turbines, the total target power also needs to be reasonably distributed to each grid-forming wind turbine participating in load following according to a certain distribution strategy (such as based on the equal margin principle, proportional distribution according to available wind power, etc.).

[0049] In one embodiment, the wind turbine unit includes a grid-forming wind turbine unit and a grid-following wind turbine unit, and the method can also be implemented as the following steps: When the grid-forming energy storage has an abnormality, control the grid-forming wind turbine set to switch to the grid-forming mode. Among them, after the grid-forming wind turbine set switches to the grid-forming mode, the grid-forming wind turbine set participates in load support with a preset proportion on the basis of ensuring energy reserve, and the remaining load support is balanced by the grid-following wind turbine set.

[0050] The beneficial effect of this embodiment is that when the grid-forming energy storage is abnormal, grid-forming can be carried out through the grid-forming wind turbine set, so as to flexibly adjust the grid-forming equipment according to the grid operation state, avoiding the situation that the grid system collapses due to the abnormality of the grid-forming energy storage and increasing the robustness.

[0051] In one embodiment, the method can also be implemented as the following steps: When the reason for the abnormality of the grid-forming energy storage is that the state of charge of the grid-forming energy storage exceeds the normal range, control the grid-forming energy storage to restore the state of charge.

[0052] In one embodiment, the strategy for controlling the grid-forming energy storage to restore the state of charge can be implemented as steps D1 - D2 as follows: In step D1, when the state of charge is lower than the first preset value, charge the grid-forming energy storage. The first preset value is the minimum value of the normal state-of-charge range of the grid-forming energy storage, and the charging power of the grid-forming energy storage satisfies the following conditions: |PE| < P Ga +P Fa -P L -kPn, |PE| ≤ maximum charging power; In step D2, when the state of charge is higher than the second preset threshold, discharge the energy storage. The second preset value is the maximum value of the normal state-of-charge range of the grid-forming energy storage, and the discharge power of the grid-forming energy storage satisfies the following conditions: |PE| ≤ PL, |PE| < maximum discharge power; Among them, the P E is the energy storage power; P Ga is the available power of the grid-following unit; P Fa is the available power of the grid-forming unit; P L is the system required power; Pn is the system maximum capacity; k is the reserved energy coefficient.

[0053] Figure 7 This is the strategy flowchart for the load regulation of the grid-forming wind turbine set in the grid-forming mode in an embodiment of the present application. In this embodiment, the output power distribution method for the grid-forming wind turbine set is as follows. Considering the reserved energy reserve for the active power distribution of the grid-forming wind turbine set and setting the reserved coefficient k, the grid-forming wind turbine power target value should satisfy: ; Among them, is the power target value of the network-forming fan; g n is the number of network-forming fans; is the available power of the i-th network-forming fan, and its value can be obtained by calculating according to the real-time wind speed and the wind power characteristics of the unit; k is the reserved coefficient; Pn is the maximum capacity of the system.

[0054] Then, by obtaining the total active power P of the network-forming fan G , the PID control algorithm is used for target following, and the output of all fans is allocated based on the equal margin principle.

[0055] In this embodiment, for the output allocation strategy of the network-following fan group, the output allocation method is as follows: Calculate the power target value of the network-following fan group: ; Among them, is the power target value of the network-following fan group; P L is the power required by the system; P E is the energy storage power; P G is the total active power of the network-forming fan group.

[0056] Obtain the real-time total active power P of the network-following fan group F , the PID control algorithm is used for target following, and the output of all fans is allocated based on the equal margin principle.

[0057] In an embodiment of the present application, the method for target following using the PID control algorithm is as follows: First, obtain the deviation between the power target value and the real-time value of the fan group; then, substitute the deviation into the following formula to calculate the total power adjustment value corresponding to the fan group: P delta = ; Among them, P delta is the total power adjustment value, and ΔP is the difference between the target value and the real-time value.

[0058] The output allocation of all fans based on the equal margin principle includes: Calculate the power adjustment value of each fan (i.e., the adjustable output of the fan) according to the following formula: P delta (i)= P delta , ; Among them, P delta (i) is the power adjustment value of the i-th fan, P delta is the total power adjustment value, w iis the power adjustment coefficient of the i-th fan, N is the total number of fans participating in the distribution, and Pa(i) is the available power of the i-th fan.

[0059] The benefits of the wind-storage hybrid network-forming control method provided by this application are as follows: (1) Significantly improve system stability. This wind-storage hybrid network-forming control method clearly defines the role division, enabling the network-forming energy storage to undertake the key task of actively supporting the power grid. As a voltage source, the network-forming energy storage can continuously stabilize the grid voltage and frequency, provide virtual inertia and damping, and effectively cope with challenges such as reduced inertia and decreased short-circuit capacity brought by the "dual high characteristics" of a high-proportion new energy power grid. When a disturbance occurs in the system, the network-forming energy storage can respond in milliseconds, slow down the rate of change of frequency (RoCoF), prevent voltage collapse, and significantly enhance system stability. At the same time, this method effectively suppresses potential sub-synchronous oscillation and wide-frequency oscillation problems in the power grid through the damping ability of the energy storage.

[0060] (2) Greatly improve the consumption capacity of renewable energy. This control method gives full play to the energy time-shifting and power smoothing functions of the energy storage, effectively solving the intermittency and volatility problems of renewable energy such as wind power. The network-forming energy storage can charge and store energy during peak wind power generation periods and discharge to supplement power when wind power output is insufficient, making the grid-connected power curve smoother and reducing the impact on the power grid. This mechanism can significantly reduce the phenomenon of wind curtailment and improve the capacity value and energy value of wind farms, promoting the healthy development of a high-proportion renewable energy new energy system.

[0061] (3) Enhance the flexibility and adaptability of system operation. Facing the changing operating conditions of a new type of new energy system, this control method enhances the overall adaptability and resilience of the system through an accurate coordination control mechanism. The network-forming energy storage improves the system's fault ride-through ability, making it easier for wind turbines to meet the low voltage ride-through (LVRT) requirements during power grid faults and avoiding cascading disconnection. In addition, the self-built voltage and frequency ability of the network-forming energy storage enables it to support black start and island operation, ensuring power supply to critical loads in extreme situations.

[0062] (4) Optimize the division of equipment functions and improve resource utilization efficiency. This method realizes the clear positioning and complementary advantages of equipment roles: the network-forming energy storage focuses on providing stable support and flexible regulation for the power grid, while wind turbines focus on maximizing wind energy capture and efficient power generation. This division of labor enables each piece of equipment to give full play to its inherent strengths, avoiding function overlap and resource waste. At the same time, since wind turbines operate in a stable power grid environment, the output limitation or disconnection risk caused by power grid disturbances can be reduced, improving wind energy utilization and the economic benefits of equipment.

[0063] Generally speaking, this wind-storage hybrid network-forming control method effectively solves the stability, volatility, and flexibility challenges faced by new energy systems through the collaborative working mode of "energy storage forming the network + wind turbines following the network", provides solid technical support for new energy systems with a high proportion of renewable energy, and has important value for promoting energy transformation and achieving the "dual carbon" goal.

[0064] Figure 8 FIG. is a schematic structural diagram of a control device for a wind-storage hybrid network-forming in an embodiment of the present application. As Figure 8 shown, the device includes: An acquisition module 801, configured to acquire the working state of the network-forming energy storage in the new energy system, where the new energy system includes at least the network-forming energy storage and a wind turbine group; A first control module 802, configured to control the network-forming energy storage to work in the network-forming mode when the network-forming energy storage is in a normal working state. When the network-forming energy storage works in the network-forming mode, the network-forming energy storage balances the supply and demand fluctuations of the new energy system on the basis of meeting energy reserve; A second control module 803, configured to control the network-forming wind turbine group to work in the following-network mode. While the network-forming energy storage balances the supply and demand fluctuations of the new energy system, the network-forming wind turbine group performs load following.

[0065] In one embodiment, the device further includes: A support module, configured to provide instantaneous support through the network-forming energy storage to make up for system disturbances when the system is disturbed; A frequency modulation module, configured to perform primary frequency modulation through the network-forming energy storage and the network-forming wind turbine group to further eliminate system disturbances when the instantaneous support provided by the network-forming energy storage cannot completely eliminate the system disturbances.

[0066] In one embodiment, the strategy for the network-forming energy storage to balance the supply and demand fluctuations of the new energy system on the basis of meeting energy reserve is as follows: When P Ga +P Fa -P L > ξ1, (ξ1 > 0), charge the network-forming energy storage, where the charging power satisfies the following conditions: |P E | < P Ga +P Fa -P L , |P E | ≤ maximum charging power - kPn; When P Ga +P Fa -P LWhen <ξ2, (ξ1>ξ2>0), discharge the grid-forming energy storage, where the discharge power satisfies the following conditions: |P E |≤P L ,|P E |< maximum discharge power - kPn; where P E is the energy storage power; P Ga is the available power of the grid-following unit; P Fa is the available power of the grid-forming unit; P L is the system required power; ξ is the preset power margin; Pn is the system maximum capacity; k is the reserved energy coefficient.

[0067] In one embodiment, the strategy for the wind turbine set to perform load following is as follows: Obtain the power of the grid-forming energy storage and the load power according to the system power balance relationship; Calculate the target power value of the wind turbine set according to the power of the grid-forming energy storage and the load power; Control the wind turbine set to perform load following according to the power target value.

[0068] In one embodiment, the device further includes: A switching module, configured to control the grid-forming wind turbine set to switch to the grid-forming mode when an abnormality occurs in the grid-forming energy storage. After the grid-forming wind turbine set switches to the grid-forming mode, the grid-forming wind turbine set participates in load support with a preset proportion on the basis of ensuring energy reserve, and the remaining load support is balanced by the grid-following wind turbine set.

[0069] In one embodiment, the device further includes: A recovery module, configured to control the grid-forming energy storage to perform charge recovery when the reason for the abnormality of the grid-forming energy storage is that the state of charge of the grid-forming energy storage exceeds the normal range.

[0070] In one embodiment, the strategy for controlling the grid-forming energy storage to perform charge recovery is as follows: When the state of charge is lower than the first preset value, charge the grid-forming energy storage. The first preset value is the minimum value of the normal state of charge range of the grid-forming energy storage. The charging power of the grid-forming energy storage satisfies the following conditions: |PE|<P Ga +P Fa -P L -kPn, |PE|≤ maximum charging power; When the state of charge is higher than the second preset threshold, discharge the energy storage. The second preset value is the maximum value of the normal state of charge range of the grid-forming energy storage. The discharge power of the grid-forming energy storage satisfies the following conditions: |PE| ≤ PL, |PE| < maximum discharge power; Among them, the P E is the energy storage power; P Ga is the available power of the grid-following unit; P Fa is the available power of the grid-forming unit; P L is the power required by the system; Pn is the maximum capacity of the system; k is the reserved energy coefficient.

[0071] This application also provides a control system for a wind-storage hybrid grid-forming system, including: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the control method of the wind-storage hybrid grid-forming system recorded in any of the above embodiments.

[0072] Figure 9 This is a schematic diagram of the hardware structure of a control system for a wind-storage hybrid grid-forming system in an embodiment of this application. As Figure 9 shown, the control system for the wind-storage hybrid grid-forming system includes: at least one processor 920; and, a memory 904 communicatively connected to the at least one processor 920; wherein, the memory 904 stores instructions executable by the at least one processor 920, and the instructions are executed by the at least one processor 920 to implement the control method of the wind-storage hybrid grid-forming system recorded in any of the above embodiments.

[0073] Referring to Figure 9 , the control system 900 for the wind-storage hybrid grid-forming system may include one or more of the following components: a processing component 902, a memory 904, a power supply component 906, a multimedia component 908, an audio component 910, an input / output (I / O) interface 912, a sensor component 914, and a communication component 916.

[0074] The processing component 902 generally controls the overall operation of the control system 900 for the wind-storage hybrid grid-forming system. The processing component 902 may include one or more processors 920 to execute instructions to complete all or part of the steps of the above method. In addition, the processing component 902 may include one or more modules to facilitate the interaction between the processing component 902 and other components. For example, the processing component 902 may include a multimedia module to facilitate the interaction between the multimedia component 908 and the processing component 902.

[0075] The memory 904 is configured to store various types of data to support the operation of the control system 900 for the wind-storage hybrid power grid. Examples of such data include instructions for any application or method operating on the control system 900 for the wind-storage hybrid power grid, such as text, pictures, videos, etc. The memory 904 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disks, or optical disks.

[0076] The power supply component 906 provides power for various components of the control system 900 for the wind-storage hybrid power grid. The power supply component 906 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the control system 900 for the wind-storage hybrid power grid.

[0077] The multimedia component 908 includes a screen that provides an output interface between the control system 900 for the wind-storage hybrid power grid and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can not only sense the boundaries of touch or swipe actions but also detect the duration and pressure associated with the touch or swipe operations. In some embodiments, the multimedia component 908 may also include a front camera and / or a rear camera. When the control system 900 for the wind-storage hybrid power grid is in an operating mode, such as the shooting mode or the video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have focal length and optical zoom capabilities.

[0078] The audio component 910 is configured to output and / or input audio signals. For example, the audio component 910 includes a microphone (MIC), which is configured to receive external audio signals when the control system 900 for the wind-storage hybrid power grid is in an operating mode, such as the alarm mode, the recording mode, the voice recognition mode, and the voice output mode. The received audio signals can be further stored in the memory 904 or transmitted via the communication component 916. In some embodiments, the audio component 910 also includes a speaker for outputting audio signals.

[0079] The I / O interface 912 provides an interface between the processing component 902 and a peripheral interface module, which may be a keyboard, click wheel, buttons, etc. These buttons may include, but are not limited to: home button, volume button, power-on button, and lock button.

[0080] The sensor component 914 includes one or more sensors for providing status assessments of various aspects for the wind-storage hybrid grid-forming control system 900. For example, the sensor component 914 may include a sound sensor. Additionally, the sensor component 914 can detect the on / off state of the wind-storage hybrid grid-forming control system 900, the relative positioning of components, such as the display and keypad of the wind-storage hybrid grid-forming control system 900, and the sensor component 914 can also detect the operating state of the wind-storage hybrid grid-forming control system 900 or a component of the wind-storage hybrid grid-forming control system 900. The sensor component 914 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor component 914 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 914 may further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0081] The communication component 916 is configured to enable the wind-storage hybrid grid-forming control system 900 to provide communication capabilities with other devices and cloud platforms in a wired or wireless manner. The wind-storage hybrid grid-forming control system 900 can access a wireless network based on communication standards, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 916 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 916 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0082] In an exemplary embodiment, the wind-storage hybrid grid-forming control system X00 can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the wind-storage hybrid grid-forming control method described in any of the above embodiments.

[0083] The present application also provides a computer-readable storage medium. When the instructions in the storage medium are executed by a processor corresponding to the control system of the wind-storage hybrid networked system, the control system of the wind-storage hybrid networked system can implement the control method of the wind-storage hybrid networked system described in any of the above embodiments.

[0084] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0085] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the specified functions in Figure 1 one or more of the flows Figure 1 or blocks or the combination of multiple flows and / or blocks.

[0086] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implements the specified functions in Figure 1 one or more of the flows Figure 1 or blocks or the combination of multiple flows and / or blocks.

[0087] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the specified functions in Figure 1 one or more of the flows Figure 1 or blocks or the combination of multiple flows and / or blocks.

[0088] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.

Claims

1. A control method for a wind-storage hybrid power grid-forming system, characterized in that, Including: Obtain the working state of the network-forming energy storage in the new energy system, where the new energy system at least includes a network-forming energy storage and a wind turbine group; When the network-forming energy storage is in a normal working state, control the network-forming energy storage to work in the network-forming mode. When the network-forming energy storage works in the network-forming mode, the network-forming energy storage balances the supply-demand fluctuations of the new energy system on the basis of meeting energy reserve; Control the wind turbine group to work in the grid-following mode. While the network-forming energy storage balances the supply-demand fluctuations of the new energy system, the wind turbine group performs load following.

2. The method according to claim 1, wherein The method further includes: When a disturbance occurs in the system, provide instantaneous support through the network-forming energy storage to make up for the system disturbance; In the case where the instantaneous support provided by the network-forming energy storage cannot completely eliminate the system disturbance, enter primary frequency modulation through the network-forming energy storage and the wind turbine group to further eliminate the system disturbance.

3. The method according to claim 1, characterized in that, The strategy for the network-forming energy storage to balance the supply-demand fluctuations of the new energy system on the basis of meeting energy reserve is as follows: When P Ga +P Fa -P L > ξ1, (ξ1 > 0), charge the network-forming energy storage, where the charging power satisfies the following conditions: |P E |<P Ga +P Fa -P L ,|P E |≤ maximum charging power - kPn; When P Ga +P Fa -P L <ξ2, (ξ1>ξ2>0), discharge the network-forming energy storage, where the discharge power satisfies the following conditions: |P E |≤P L ,|P E |< maximum discharge power - kPn; Among them, P E is the energy storage power; P Ga is the available power of the grid-following unit; P Fa is the available power of the grid-forming unit; P L is the power required by the system; ξ1 and ξ2 are preset power margins; Pn is the maximum capacity of the system; k is the reserved energy coefficient.

4. The method according to claim 1, characterized in that, The strategy for the wind turbine group to perform load following is as follows: Obtain the power of the network-forming energy storage and the load power according to the system power balance relationship; Calculate the target power value of the wind turbine group according to the power of the network-forming energy storage and the load power; Control the wind turbine group to perform load following according to the power target value.

5. The method according to claim 1, characterized in that, The wind turbine group includes a network-forming wind turbine group and a grid-following wind turbine group. The method further includes: When the network-forming energy storage is abnormal, control the network-forming wind turbine group to switch to the network-forming mode. After the network-forming wind turbine group switches to the network-forming mode, the network-forming wind turbine group participates in load support with a preset proportion on the basis of ensuring energy reserve, and the remaining load support is balanced by the grid-following wind turbine group.

6. The method according to claim 5, characterized in that, The method further includes: When the reason for the abnormality of the network-forming energy storage is that the state of charge of the network-forming energy storage exceeds the normal range, control the network-forming energy storage to recover the state of charge.

7. The method according to claim 5, wherein The strategy for controlling the network-forming energy storage to recover the state of charge is as follows: When the state of charge is lower than the first preset value, charge the network-forming energy storage. The first preset value is the minimum value of the normal state-of-charge range of the network-forming energy storage, and the charging power of the network-forming energy storage satisfies the following conditions: |P E |<P Ga +P Fa -P L -kPn, |P E | ≤ maximum charging power; When the state of charge is higher than the second preset threshold, discharge the energy storage. The second preset value is the maximum value of the normal state-of-charge range of the network-forming energy storage, and the discharging power of the network-forming energy storage satisfies the following conditions: |P E |≤P L , |P E |<Maximum discharge power; Among them, the P E is the energy storage power; P Ga is the available power of the grid-following unit; P Fa is the available power of the grid-forming unit; P L is the power required by the system; Pn is the maximum capacity of the system; k is the reserved energy coefficient.

8. A control device for a wind-storage hybrid power grid-forming system, characterized in that, Including: An acquisition module for obtaining the working state of the network-forming energy storage in the new energy system, where the new energy system at least includes a network-forming energy storage and a wind turbine group; A first control module for controlling the network-forming energy storage to work in the network-forming mode when the network-forming energy storage is in a normal working state. When the network-forming energy storage works in the network-forming mode, the network-forming energy storage balances the supply-demand fluctuations of the new energy system on the basis of meeting energy reserve; A second control module for controlling the network-forming wind turbine group to work in the grid-following mode. While the network-forming energy storage balances the supply-demand fluctuations of the new energy system, the network-forming wind turbine group performs load following.

9. A control system for a hybrid wind and energy storage grid-forming system, characterized in that, Including: At least one processor; And, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to implement the control method of the wind-storage hybrid network formation as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, When the instructions in the storage medium are executed by the processor corresponding to the control system of the wind-storage hybrid network formation, the control system of the wind-storage hybrid network formation can implement the control method of the wind-storage hybrid network formation as described in any one of claims 1-7.

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