Control system and method applied to wind power distributed energy storage

Abstract

The invention provides a control system and method applied to wind power distributed energy storage. The wind power distributed energy storage comprises a target wind turbine generator and an energy storage unit corresponding to the target wind turbine generator. The control system comprises a local control module and a centralized control module, wherein the local control module and an energy storage unit are used for realizing off-grid control connection between a target wind turbine generator and the corresponding energy storage unit; the centralized control module is connected with the local control module through a wired network and a wireless network, and is used for realizing grid-connected control connection between the target wind turbine generator and the corresponding energy storage unit; according to the invention, the distributed energy storage system accessed to the wind power plant has the real-time advantage of local controller access, the synchronization defect caused by the distributed energy storage system is effectively avoided, and safe and stable remote and synchronous control is realized.

Description

Technical Field

[0001] The present invention belongs to the field of new energy and electricity, and in particular relates to a control system and method applied to wind power distributed energy storage. Background Art

[0002] Renewable energy generation such as wind power has random fluctuations and intermittent characteristics, and compared with synchronous generators, it does not have damping characteristics. With the increasing penetration rate of new energy units, it has brought severe challenges to the safe and stable operation of the power system. The energy storage system has the characteristics of energy time shifting, rapid response and flexible layout. It is an important technical means to promote the consumption of new energy and enhance the active support capacity of new energy. With the further advancement of energy transformation, "new energy + energy storage" will become the mainstream model of new energy development.

[0003] At present, the distributed energy storage of wind farms is a form of energy storage configuration with small capacity and power and close to wind turbines, usually configured near the wind turbines. Distributed energy storage is one of the important solutions for wind farms to access energy storage systems. Compared with centralized energy storage, the installation and site selection of distributed energy storage is more flexible, and the initial investment cost is lower. In addition to realizing basic application scenarios such as power tracking, smooth output, reactive power compensation, peak shaving and valley filling for traditional centralized energy storage, it can also provide backup power supply and other functions for single or multiple units, and provide optimization solutions for various working conditions such as typhoons, becoming an important support for improving the safety, controllability, and network friendliness of wind power.

[0004] The energy storage system configured in the wind farm needs to access the control system through network communication in order to perform manual or automatic control of functions such as charging and discharging, and implement various operating strategies such as frequency modulation and reactive power compensation.

[0005] Existing wind power distributed energy storage systems and network communication access are mostly divided into two categories. One is to use local controllers (industrial computers, PLCs, etc.) deployed inside energy storage containers to monitor the energy storage system and manage its energy. This solution has a short communication distance and can provide fast and safe energy storage system monitoring and control functions. The other solution is to choose to access the existing fiber optic ring network of the wind farm and connect to the energy storage EMS workstation in the control room of the booster station. This solution has a long communication distance and can provide operators with more convenient monitoring, management and control functions.

[0006] According to existing technical conditions, the communication access of distributed energy storage has a large room for improvement. At present, most of the access solutions adopted only have a single communication access solution, such as using a local controller to control a single set of distributed energy storage; or using a fiber optic ring network to access a remote workstation for control and management. Few wind farms will connect to distributed energy storage systems that take into account multiple control modes and multiple network access solutions at the same time.

[0007] If a local controller (industrial computer, etc.) is used for control, the quality and speed of communication can be guaranteed due to the short network communication distance, but the distributed energy storage system can generally only perform quasi-local control, requiring staff to go to the machine position for manual operation, and it is difficult to control multiple distributed energy storage devices at the same time. It is difficult to perform the control function when the wind turbine is connected to the grid, which has high requirements for coordinated control and synchronization. It generally operates in the off-grid backup power function mode, that is, when the wind turbine is off-grid, typhoon warnings and other special working conditions, it acts as a backup power supply. The application scenario is relatively single, and the full potential of the energy storage system is not maximized.

[0008] If the wind farm fiber ring network is connected and the energy storage system EMS server or workstation is used for unified control, it can meet the needs of various grid-connected conditions, and realize reactive power compensation, frequency modulation and other functions that can improve the grid-connectedness of wind farms. However, its network communication distance is long and the possibility of failure is high. Once the fiber ring network or network switching equipment fails, the energy storage system may enter a disconnected or uncontrolled state, which may cause failures or accidents in severe cases. In addition, control functions that require higher real-time requirements, such as when the wind turbine is off-grid, are difficult to achieve. Summary of the invention

[0009] The purpose of the present invention is to provide a control system and method for wind power distributed energy storage, which solves the above-mentioned shortcomings of the existing wind power distributed energy storage system and network communication access.

[0010] In order to achieve the above object, the technical solution adopted by the present invention is:

[0011] The present invention provides a control system for wind power distributed energy storage, wherein the wind power distributed energy storage includes a target wind turbine group and an energy storage unit corresponding to the target wind turbine group; the control system includes a local control module and a centralized control module, wherein:

[0012] The local control module and the energy storage unit are used to realize an off-grid control connection between the target wind turbine group and the corresponding energy storage unit;

[0013] The centralized control module is connected to the local control module via a wired network and a wireless network respectively, so as to realize the grid-connected control connection between the target wind turbine group and the corresponding energy storage unit.

[0014] Preferably, the local control module includes a local controller, a local switch and a serial port server, wherein: the local controller is controlled and connected to the local switch, and adopts the Modbus TCP protocol; the local switch is controlled and connected to the serial port server, and adopts the Modbus TCP protocol; the local switch is controlled and connected to the energy storage converter PCS of the energy storage unit, and adopts the Modbus TCP protocol; the serial port server is controlled and connected to the on-grid and off-grid monitoring module of the energy storage unit, and adopts the Modbus RTU protocol.

[0015] Preferably, the local controller is connected to the local switch via a twisted pair cable that complies with the 1000Base-T standard and is equipped with an RJ45 interface; the local switch is connected to the serial port server via a twisted pair cable that complies with the 1000Base-T standard and is equipped with an RJ45 interface; the local switch is connected to the energy storage converter PCS via a twisted pair cable that complies with the 1000Base-T standard and is equipped with an RJ45 interface; the serial port server is connected to the on-grid and off-grid monitoring module via an RS485 cable.

[0016] Preferably, the centralized control module includes a centralized controller and a core switch, wherein:

[0017] The centralized control module is connected to the core switch using Modbus TCP protocol.

[0018] The core switch and the local control module are connected via an optical fiber ring network control.

[0019] Preferably, the centralized controller and the core switch are connected via a twisted pair cable that complies with the 1000Base-T standard and is equipped with an RJ45 interface;

[0020] The core switch and the local switch in the local control module are connected via an optical fiber ring network switch control, and the Modbus TCP protocol is adopted.

[0021] Preferably, the core switch and the optical fiber ring network switch are connected via a twisted pair cable that complies with the 1000Base-T standard and is equipped with an RJ45 interface;

[0022] The optical fiber ring network switch and the local switch are connected via a twisted pair cable with an RJ45 interface that complies with the 1000Base-T standard.

[0023] Preferably, the core switch and the local switch are connected via a wireless node unit control.

[0024] Preferably, the wireless node unit comprises a first wireless module and a second wireless module, wherein:

[0025] The first wireless module and the core switch are connected via a twisted pair cable that complies with the 1000Base-T standard and is equipped with an RJ45 interface;

[0026] The first wireless module is connected to the second wireless module via a wireless network;

[0027] The second wireless module and the local switch are connected via a twisted pair cable with an RJ45 interface that complies with the 1000Base-T standard.

[0028] A control method for wind power distributed energy storage includes the following steps:

[0029] Determine the grid-connected and off-grid status of the wind energy storage system, including:

[0030] If the wind storage system is off-grid, the local control module is used to control the energy storage unit, and the centralized control module stops controlling;

[0031] If the wind-storage system is in grid-connected state, the centralized control module is used to control the energy storage unit, and the local control module stops control.

[0032] Preferably, when the wired network communication between the centralized control module and the local control module is normal, the centralized control module sends the control instruction to the energy storage unit through the wired network;

[0033] When the wired network communication between the centralized control module and the local control module is abnormal, the centralized control module sends the control instructions to the energy storage unit through the wireless network.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention provides a control system for wind power distributed energy storage. In view of the single network architecture of the distributed energy storage system currently connected to the wind farm, the present invention aims to resolve the contradiction between the two network access solutions and propose a new wind farm distributed energy storage system and its network communication architecture to meet the real-time and synchronization requirements of various working conditions and adjustment and control functions, while ensuring the security, stability and communication quality of network communication to the greatest extent. The present invention can enable the distributed energy storage system connected to the wind farm to have the real-time advantage of local controller access, effectively avoid the synchronization defects it brings, realize safe and stable remote and synchronous control, execute different operating modes and algorithm strategies according to different working conditions, and realize free switching between on-grid and off-grid states.

[0036] The present invention enables the distributed energy storage system to switch freely between the grid-connected working mode and the off-grid working mode flexibly, provides a feasible solution for the flexible and fast realization of remote grid-connected centralized control and off-grid control, and can simultaneously ensure the timeliness of off-grid local control and the synchronization of grid-connected remote control. Previously, most distributed energy storage systems connected to wind farms, according to their main off-grid function or grid-connected function, choose one of the two, remote centralized control or local control, to access the network architecture: if the main function is to connect to the grid, the wired network architecture is mainly used for centralized control; if the main function is to off-grid regulation, a local control system is generally used. When using a wired network to access the optical fiber ring network for centralized control, if the energy storage system operates in the off-grid mode, it may cause problems such as failures due to untimely transmission of data upload and instruction issuance. If local network access is used for local control, the issuance of control instructions during grid-connected regulation is more cumbersome and the synchronization is poor. In the scenario where the grid-connected regulation function and the off-grid regulation function are equally important, the existing solutions cannot balance the centralized control requiring synchronization and the local control requiring real-time performance. The present invention provides a feasible solution to solve the current problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the wind farm distributed energy storage system and its communication architecture;

[0038] Figure 2 It is a schematic diagram of the local control system of the distributed energy storage in the wind farm and its network communication architecture;

[0039] Figure 3 It is a schematic diagram of the centralized control system of the distributed energy storage system and its wired network communication architecture;

[0040] Figure 4 It is a schematic diagram of the networking mode of the distributed energy storage system and the optical fiber ring network of the wind turbine;

[0041] Figure 5 It is a centralized control system for distributed energy storage systems and its wireless communication network architecture;

[0042] Figure 6 It is a schematic diagram of the relay transmission function of the wireless communication network architecture of the distributed energy storage system;

[0043] Figure 7 It is a combined architecture of distributed energy storage systems and their various communication methods;

[0044] Figure 8 It is a schematic diagram of decision-making switching logic of distributed energy storage system and its intelligent network communication scheme;

[0045] Fig. 9It is a workflow diagram for the synchronous operation and automatic switching of a distributed energy storage system and its communication system. DETAILED DESCRIPTION

[0046] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0047] Example 1

[0048] like Figures 1 to 9 As shown, the present embodiment provides a control system for wind power distributed energy storage, which provides a local control module and a centralized control module for distributed energy storage, wherein the centralized control system is divided into a centralized wired control mode and a centralized wireless control mode. In practical applications, three different network access solutions need to be deployed simultaneously to coordinate and realize the collaborative work of multiple network architectures, maximize the advantages of various network access architectures, and avoid being affected by their respective disadvantages.

[0049] The wind power distributed energy storage includes a target wind turbine group and an energy storage unit corresponding to the target wind turbine group.

[0050] The control system includes a local control module and a centralized control module, wherein:

[0051] The local control module and the energy storage unit are used to realize an off-grid control connection between the target wind turbine group and the corresponding energy storage unit;

[0052] The centralized control module is connected to the local control module through a wired network and a wireless network respectively. The centralized control module is used to realize the grid-connected control connection between the target wind turbine group and the corresponding energy storage unit through the wired network. The centralized control module is used to realize the grid-connected control connection between the target wind turbine group and the corresponding energy storage unit through the wireless network when the wired network communication of the centralized control module is interrupted.

[0053] Example 2

[0054] like Figure 2 As shown, based on Example 1, this embodiment provides a control system for wind power distributed energy storage, wherein the energy storage unit includes an on-grid and off-grid monitoring module, an energy storage battery, an energy storage converter PCS and a battery management module, wherein:

[0055] The power input end of the energy storage converter PCS is connected to the power output end of the target wind turbine generator set; the power output end of the energy storage converter PCS is connected to the power input end of the energy storage battery.

[0056] The energy storage converter PCS is connected to the battery management module via wired communication, and the CAN protocol is adopted.

[0057] The power input terminal of the on-grid and off-grid monitoring module is connected to the power output terminal of the target wind turbine generator set.

[0058] The local control module includes a local controller, a local switch and a serial port server, wherein:

[0059] The local controller is connected to the local switch control and uses the Modbus TCP protocol.

[0060] The local switch is connected to the serial port server control and adopts Modbus TCP protocol.

[0061] The local switch is connected to the energy storage converter PCS control and adopts Modbus TCP protocol.

[0062] The serial port server is controlled and connected with the on-grid and off-grid monitoring module, and adopts Modbus RTU protocol.

[0063] The regulation function of wind power distributed energy storage can be divided into two categories: grid-connected regulation and off-grid regulation according to different electrical access conditions. The local control system and its network communication architecture focus on the off-grid regulation function, specifically:

[0064] In extreme working conditions such as wind turbines being off-grid and losing power (such as power transmission lines being damaged and losing grid support in extreme weather), energy storage units can provide off-grid regulation and control functions as needed, mainly providing VF off-grid power supply and other functions. This type of regulation requires high real-time requirements, and long-distance network communication has a high risk of time delay, which also increases the risk of communication failure or terminal, so it is necessary to introduce a local control system to perform regulation functions in the off-grid state.

[0065] The energy storage converter PCS is a device used to connect the energy storage system to the power system; its main function is to convert the DC power in the energy storage system into AC power, or to convert the AC power of the power system into the DC power required by the energy storage system. The design of the energy storage converter allows the energy storage system to charge and discharge when needed.

[0066] On the one hand, the energy storage inverter PCS is connected to the local controller and receives instructions issued by the local controller. On the other hand, the energy storage inverter PCS establishes an electrical connection with the energy storage battery and a wired communication connection with the energy storage battery management module (BMS). It adjusts the working state according to the received control instructions to realize the control of the charging and discharging functions of the energy storage equipment.

[0067] The local controller establishes a communication link with the energy storage inverter device and adopts the Modbus TCP protocol to achieve rapid response to command issuance. The local controller acts as the Modbus master station and the energy storage inverter acts as the PCS slave station. The software system in the local controller obtains the working status of the energy storage system in real time by reading the Modbus register of the energy storage PCS, and controls it by writing to the register of the energy storage inverter PCS.

[0068] The on-grid and off-grid monitoring module establishes a communication link with the serial port server through the Modbus RTU protocol. The local controller communicates with the on-grid and off-grid monitoring module through the serial port server to monitor the on-grid and off-grid status of the wind energy storage system in real time. In the on-grid state, the local controller does not work; in the off-grid state, the local controller intervenes to control the energy storage system.

[0069] Example 3

[0070] On the basis of Example 2, this embodiment provides a control system for wind power distributed energy storage, in which a local controller and a local switch are connected via a twisted pair cable compliant with the 1000Base-T standard and equipped with an RJ45 interface.

[0071] The local switch and the serial port server are connected via a twisted pair cable with an RJ45 interface that complies with the 1000Base-T standard.

[0072] The local switch and the energy storage converter PCS are connected via a twisted pair cable with an RJ45 interface that complies with the 1000Base-T standard.

[0073] The serial port server is connected to the on-grid and off-grid monitoring module via an RS485 cable.

[0074] Example 4

[0075] Based on Example 1, this embodiment provides a control system applied to wind power distributed energy storage, wherein the centralized control module includes a centralized controller and a core switch, wherein:

[0076] The centralized control module is controlled and connected with the core switch using the Modbus TCP protocol.

[0077] The core switch and the local control module are connected via an optical fiber ring network control.

[0078] Example 5

[0079] On the basis of Example 4, this embodiment provides a control system for wind power distributed energy storage, wherein the core switch and the local switch in the local control module are connected via a fiber optic ring network switch control, and the Modbus TCP protocol is used.

[0080] The centralized controller and the core switch are connected via a twisted pair cable that is equipped with an RJ45 interface and complies with the 1000Base-T standard.

[0081] The core switch and the optical fiber ring network switch are connected via a twisted pair cable that is equipped with an RJ45 interface and complies with the 1000Base-T standard.

[0082] The optical fiber ring network switch and the local switch are connected via a twisted pair cable with an RJ45 interface that complies with the 1000Base-T standard.

[0083] Example 6

[0084] Based on Example 1, this embodiment provides a control system applied to wind power distributed energy storage, wherein the centralized control module includes a centralized controller and a core switch, wherein:

[0085] The centralized controller and the core switch are controlled to be connected.

[0086] The core switch and the local switch are connected via a wireless node unit control.

[0087] Example 7

[0088] On the basis of Example 6, this embodiment provides a control system for wind power distributed energy storage, wherein the centralized controller and the core switch are connected via a twisted pair cable compliant with the 1000Base-T standard and equipped with an RJ45 interface.

[0089] Example 8

[0090] On the basis of Example 6, this embodiment provides a control system for wind power distributed energy storage, wherein the wireless node unit includes a first wireless module and a second wireless module, wherein:

[0091] The first wireless module and the core switch are connected via a twisted pair cable that is equipped with an RJ45 interface and complies with the 1000Base-T standard.

[0092] The first wireless module is connected to the second wireless module via a wireless network.

[0093] The second wireless module and the local switch are connected via a twisted pair cable with an RJ45 interface that complies with the 1000Base-T standard.

[0094] Example 9

[0095] Based on Example 6, this embodiment provides a control system for wind power distributed energy storage. Due to power consumption limitations, the working distance of the wireless module is limited, so continuous transmission is required through relays so that each connected energy storage unit can communicate with the centralized control module. To achieve relay transmission, wireless modules need to be installed at energy storage units that are not connected and close to the wireless transmission path according to the actual position of the wind farm.

[0096] Example 10

[0097] This embodiment provides a control method for wind power distributed energy storage. The three network communication architectures cannot work at the same time and need to be switched according to different working conditions to maximize the advantages of various network access architectures while avoiding the influence of their respective disadvantages. This embodiment provides a smart network communication solution decision switching logic, attached Figure 8 It is a flowchart of the decision switching logic, specifically, including the following steps:

[0098] Determine the grid-connected and off-grid status of the wind energy storage system, including:

[0099] If the wind storage system is off-grid, the local control module is used to control the energy storage unit, and the centralized control module stops controlling;

[0100] If the wind-storage system is in grid-connected state, the centralized control module is used to control the energy storage unit, and the local control module stops control.

[0101] When the wired network communication between the centralized control module and the local control module is normal, the centralized control module sends the control command to the energy storage unit through the wired network;

[0102] When the wired network communication between the centralized control module and the local control module is abnormal, the centralized control module sends the control instructions to the energy storage unit through the wireless network.

[0103] Embodiment 11

[0104] Taking wind farms A and B in two different regions as an example and access to distributed energy storage as the background, the system proposed in this embodiment and its application effect are introduced.

[0105] Wind Farm A is a wind farm located in the hilly terrain of the coastal area of ​​South China, with an installed capacity of 100MW. According to its operation needs, it is planned to be equipped with two distributed energy storage systems, one of which is a lithium battery energy storage system with a specification of 200kW / 400kWh, and the other is a hybrid energy storage system composed of supercapacitors and lithium batteries. They are deployed in the wind farm's #1 wind turbine and #2 wind turbine, respectively, with a straight-line distance of 3.58km between them. According to the actual situation on site, the distributed energy storage system has the function of both grid-connected regulation of the wind farm and off-grid regulation.

[0106] Wind Farm B is an offshore wind power plant located in the offshore waters with an installed capacity of 250MW. According to operational needs, it is equipped with 16 distributed energy storage systems, all of which are lithium-ion energy storage systems with specifications of 50kW / 100kWh. They are deployed in 16 wind turbines #1, #2, #5, #8, and #9 in the wind farm. According to on-site needs, the distributed energy storage system is mainly used for power regulation, and in a few cases, it is also used for grid-connected regulation.

[0107] 1. Wind Farm A Implementation Case:

[0108] First, according to the deployment location of the distributed energy storage system, the lithium battery energy storage system is connected to the optical fiber ring network of wind turbine #1 of the wind farm through the local switch, and the hybrid energy storage system is connected to the optical fiber ring network of wind turbine #2 through the local switch.

[0109] Secondly, local controllers are deployed for the two energy storage systems respectively, and local devices such as on-grid and off-grid monitoring modules, serial port servers, etc. are installed.

[0110] Finally, wireless network access is performed. The straight-line distance between the hybrid energy storage system and its connected wind turbines and the lithium battery energy storage system and its connected wind turbines is 3.6 km, which exceeds the maximum communication distance of a single wireless module. Therefore, unit #6 is selected to access an additional wireless communication module to provide relay services for it. The hybrid energy storage system and its connected wind turbines are close to the booster station deployed by the centralized control system, but still exceed the maximum transmission distance of a single wireless communication module. Therefore, based on the geographical location, wind turbines #11, #15, #26, and #8 are selected to access the wireless communication module to provide relay services. At the same time, a wireless communication module is connected to the core switch of the centralized control system to receive data from the distributed energy storage system and issue control instructions from the centralized control system.

[0111] The workflow of the two energy storage systems when they are put into operation can be divided into major steps.

[0112] Step 1: Determine the on-grid and off-grid status of the system. If the system is running in off-grid mode, the energy storage centralized control system stops working and is taken over by the local control system, and the process goes to step 5. If the system is running in on-grid mode, the energy storage local system stops taking over and is connected to the centralized control system for control, and the process goes to step 2.

[0113] Step ②: Determine whether the wired network is connected or disconnected. If the wired network link can transmit data normally, the energy storage data is sent to the centralized control system via the wired network, and the centralized control system sends control instructions to the energy storage system, and then enter step ③. If the wired network link cannot transmit data normally, the wireless transmission channel is enabled, and then enter step ④.

[0114] Step 3: The energy storage centralized control system calculates the operating parameters required by the energy storage system in real time, such as operating status, power, etc., based on the currently running algorithm and the collected energy storage data, and sends it to the corresponding energy storage local system through the wired network. After receiving the data, the energy storage local system forwards it to the energy storage system for execution. If the energy storage local system does not receive the command data, the energy storage system will not operate.

[0115] Step ④: If the energy storage centralized control system finds that it cannot communicate with the energy storage system through the wired network, it will enable the wireless transmission channel for emergency response and send a shutdown command to the corresponding energy storage system through the wireless channel to temporarily stop working and ensure safety.

[0116] Step ⑤: When the system is in off-grid operation, the energy storage centralized control system stops calculating the control instructions of the energy storage system, and the local controller takes over the energy storage system, calculates the working instructions of the energy storage system locally and directly sends them to the energy storage system for execution.

[0117] Since it was put into operation, it has been running in local control mode and centralized control mode for more than 6 months under the protection of this communication architecture. When switching between on-grid and off-grid states, the energy storage system control mode automatically switched control modes 18 times (including during experiments and actual operation), without any abnormality or failure.

[0118] 1. Wind Farm B Implementation Case:

[0119] First, according to the deployment location of the distributed energy storage system, the distributed energy storage system is connected to the optical fiber ring network of 16 wind turbines in the wind farm #1, #2, #5, #8, #9, etc. through a local switch.

[0120] Secondly, local controllers were deployed for each of the 16 energy storage systems, and local devices such as on-grid and off-grid monitoring modules and serial port servers were installed.

[0121] Finally, wireless network access is performed. The 16 wind turbines and their connected distributed energy storage systems are not continuous. Therefore, it is impossible to ensure that each system is within the coverage of the wireless communication module from the geographical location. Some positions exceed the maximum communication distance of a single wireless module. Therefore, #3 is selected.

[0122] A total of 9 units, including #19, #7, and #21, that were not connected to the distributed energy storage system were connected to additional wireless communication modules to provide relay services. At the same time, a wireless communication module was connected to the core switch of the centralized control system to receive data from the distributed energy storage system and issue control instructions to the centralized control system.

[0123] The workflow when the two energy storage systems are put into operation can be divided into major steps.

[0124] Step 1: Determine the on-grid and off-grid status of the system. If the system is running in off-grid mode, the energy storage centralized control system stops working and is taken over by the local control system, and the process goes to step 5. If the system is running in on-grid mode, the energy storage local system stops taking over and is connected to the centralized control system for control, and the process goes to step 2.

[0125] Step ②: Determine whether the wired network is connected or disconnected. If the wired network link can transmit data normally, the energy storage data is sent to the centralized control system via the wired network, and the centralized control system sends control instructions to the energy storage system, and then enter step ③. If the wired network link cannot transmit data normally, the wireless transmission channel is enabled, and then enter step ④.

[0126] Step 3: The energy storage centralized control system calculates the operating parameters required by the energy storage system in real time, such as operating status, power, etc., based on the currently running algorithm and the collected energy storage data, and sends it to the corresponding energy storage local system through the wired network. After receiving the data, the energy storage local system forwards it to the energy storage system for execution. If the energy storage local system does not receive the command data, the energy storage system will not operate.

[0127] Step ④: If the energy storage centralized control system finds that it cannot communicate with the energy storage system through the wired network, it will enable the wireless transmission channel for emergency response and send a shutdown command to the corresponding energy storage system through the wireless channel to temporarily stop working and ensure safety.

[0128] Step ⑤: When the system is in off-grid operation, the energy storage centralized control system stops calculating the control instructions of the energy storage system, and the local controller takes over the energy storage system, calculates the working instructions of the energy storage system locally and directly sends them to the energy storage system for execution.

[0129] Since it was put into operation, under the protection of this communication architecture, it has been running in local control mode and centralized control mode for more than 9 months. When encountering extreme weather such as typhoons, it has switched from the grid-connected regulation function under the centralized control mode to the off-grid regulation function under local control 3 times, and after the end, all the off-grid regulation functions under local control were restored to the grid-connected regulation function under the centralized control mode, without any abnormality or failure. Among them, Unit #8 and its deployed distributed energy storage system had a brief communication failure due to a fiber optic failure in the wind farm. The centralized control system discovered the disconnection in time and sent a shutdown command to it through the wireless communication network, successfully shutting down the distributed energy storage system temporarily and avoiding potential failures and accidents. After the communication fiber was repaired, the centralized control system automatically and successfully restored control of the distributed energy storage system.

[0130] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A control system for wind power distributed energy storage, It is characterized in that The wind power distributed energy storage includes a target wind turbine group and an energy storage unit corresponding to the target wind turbine group; the control system includes a local control module and a centralized control module, wherein: The local control module and the energy storage unit are used to realize an off-grid control connection between the target wind turbine group and the corresponding energy storage unit; The centralized control module is connected to the local control module via a wired network and a wireless network respectively, so as to realize the grid-connected control connection between the target wind turbine group and the corresponding energy storage unit.

2. A control system for wind power distributed energy storage according to claim 1, It is characterized in that The local control module includes a local controller, a local switch and a serial port server, wherein: the local controller is controlled and connected to the local switch, and adopts the Modbus TCP protocol; the local switch is controlled and connected to the serial port server, and adopts the ModbusTCP protocol; the local switch is controlled and connected to the energy storage converter PCS of the energy storage unit, and adopts the Modbus TCP protocol; the serial port server is controlled and connected to the grid-connected and off-grid monitoring module of the energy storage unit, and adopts the Modbus RTU protocol.

3. A control system for wind power distributed energy storage according to claim 2, It is characterized in that The local controller is connected to the local switch via a twisted pair cable that complies with the 1000Base-T standard and is equipped with an RJ45 interface; the local switch is connected to the serial port server via a twisted pair cable that complies with the 1000Base-T standard and is equipped with an RJ45 interface; the local switch is connected to the energy storage converter PCS via a twisted pair cable that complies with the 1000Base-T standard and is equipped with an RJ45 interface; the serial port server is connected to the on-grid and off-grid monitoring module via an RS485 cable.

4. A control system for wind power distributed energy storage according to claim 1, It is characterized in that The centralized control module includes a centralized controller and a core switch, wherein: The centralized control module is connected to the core switch using Modbus TCP protocol. The core switch and the local control module are connected via an optical fiber ring network control.

5. A control system for wind power distributed energy storage according to claim 4, It is characterized in that The centralized controller and the core switch are connected via a twisted pair cable that is equipped with an RJ45 interface and complies with the 1000Base-T standard; The core switch and the local switch in the local control module are connected via an optical fiber ring network switch control, and the Modbus TCP protocol is adopted.

6. A control system for wind power distributed energy storage according to claim 4, It is characterized in that The core switch and the optical fiber ring network switch are connected via a twisted pair cable that is equipped with an RJ45 interface and complies with the 1000Base-T standard; The optical fiber ring network switch and the local switch are connected via a twisted pair cable with an RJ45 interface that complies with the 1000Base-T standard.

7. A control system for wind power distributed energy storage according to claim 4, It is characterized in that The core switch and the local switch are connected via a wireless node unit control.

8. A control system for wind power distributed energy storage according to claim 7, It is characterized in that The wireless node unit includes a first wireless module and a second wireless module, wherein: The first wireless module and the core switch are connected via a twisted pair cable that complies with the 1000Base-T standard and is equipped with an RJ45 interface; The first wireless module is connected to the second wireless module via a wireless network; The second wireless module and the local switch are connected via a twisted pair cable with an RJ45 interface that complies with the 1000Base-T standard.

9. A control method for wind power distributed energy storage, It is characterized in that The following steps are involved: Determine the grid-connected and off-grid status of the wind energy storage system, including: If the wind storage system is off-grid, the local control module is used to control the energy storage unit, and the centralized control module stops controlling; If the wind-storage system is in grid-connected state, the centralized control module is used to control the energy storage unit, and the local control module stops control.

10. A control method for wind power distributed energy storage according to claim 9, It is characterized in that When the wired network communication between the centralized control module and the local control module is normal, the centralized control module sends the control command to the energy storage unit through the wired network; When the wired network communication between the centralized control module and the local control module is abnormal, the centralized control module sends the control instructions to the energy storage unit through the wireless network.

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