Battery energy storage power station plug-and-play information interaction method based on IEC61850

Abstract

The technical scheme of the invention discloses a plug-and-play information interaction method for a battery energy storage power station based on IEC61850 (International Electrotechnical Commission 61850). The invention provides a battery energy storage power station plug-and-play information interaction mechanism based on IEC61850 by considering the defects of unknown data transmission meaning, no self-description capability, low communication efficiency, high expansion and maintenance cost and the like existing in a traditional communication protocol facing a transmission process. Information interaction of the battery energy storage power station accessing the power grid is standardized, aiming at monitoring identification and registration difficulties existing in the process that the battery energy storage power station participates in grid-connected operation, a battery energy storage system is improved from limited access and fixed access to ordered and standard access, friendly interaction between the power grid and the battery energy storage power station is promoted, and the power grid accessing efficiency is improved. And the adaptive capacity of the battery energy storage power station in different application scenes is improved.

Description

Technical Field

[0001] The present invention relates to a plug-and-play information interaction technology for a battery energy storage power station based on IEC61850, which is used to solve the information interaction problem between a distribution network control system master station and a battery energy storage power station when a battery energy storage system in the field of smart distribution networks is connected to the grid. Background Art

[0002] The widespread integration of distributed energy resources (DERs), such as wind power and photovoltaics, into the grid poses significant challenges to stable grid operation and regulation. Battery energy storage power stations offer solutions for achieving stable grid operation by smoothing fluctuations and shifting peak loads. With the increasing penetration of renewable energy, battery energy storage power stations and a large number of smart electronic devices are integrated into the grid's communication network through communication interfaces, leading to a gradual evolution of traditional distribution systems into the Internet of Things (IoT). The communication interaction process for grid-connected energy storage systems is complex. Currently, the communication protocols used are traditional, transmission-oriented protocols that only guarantee the accuracy and security of data transmission. Data lacks clear meaning and self-description capabilities. Communication and functional configuration of these smart electronic devices require on-site personnel, requiring significant human and material resources to retrofit existing distribution network automation systems, resulting in significant maintenance costs. Simplifying the integration of a large number of smart electronic devices into the IoT and enabling device self-description are key challenges in coordinated grid-connected control of energy storage systems. Therefore, addressing the challenges of monitoring identification and registration during grid-connected operation requires a plug-and-play information interaction technology for battery energy storage power stations that balances communication efficiency and security.

[0003] "Plug and play" means that when a device is connected to the distribution network, the master station can automatically identify, verify, and perform operation management. There is already a certain foundation for technical research on plug and play. Literature [1] modeled the distribution terminal and analyzed the consistency and interoperability test requirements of the model based on the IEC 61850 standard, but did not provide a corresponding communication interaction strategy. Literature [2] proposed a plug and play system and communication control strategy for dynamic tracking of distribution area equipment. However, the application scenarios of energy storage connected to the distribution network are complex and diverse. This literature did not provide customized information interaction processes and methods for energy storage equipment. Literature [3] analyzed the logical modeling, self-expression information configuration, and information interaction between the energy storage power station and the master station monitoring system based on IEC61850. However, the analysis of the plug and play modules of the energy storage power station was relatively fragmented. It did not describe in detail how the various links were coupled, nor did it provide an overall information interaction architecture.

[0004] References

[0005] Reference [1]: Xi Yu, Chen Bo, Yuan Zhiyong, et al. Research on modeling and testing requirements of distribution automation terminals based on IEC 61850 [J]. Electrical Measurement and Instrumentation, 2020, 57(7): 41-47.

[0006] Reference [2]: Wu Hai, Teng Xianliang, Zhou Cheng, et al. Implementation method of plug-and-play for substation equipment based on IEC61850 [J]. China Southern Power Grid Technology, 2021, 15(5): 72-78.

[0007] Reference [3]: Yang Donghai, Liu Changyun, Wang Wei, et al. Design of modular energy storage battery cabinet suitable for random power supply plug-and-play [J]. Communication Power Technology, 2016, 33(5): 70-75. Summary of the Invention

[0008] The purpose of this invention is to propose a plug-and-play information interaction technology for battery energy storage power stations based on IEC61850, targeting the application scenario of battery energy storage power stations connected to the distribution network. This technology solves the information interaction problem of plug-and-play access of energy storage power stations, optimizes the information flow of grid-connected operation of battery energy storage power stations, improves the grid-connected access efficiency and adaptability of battery energy storage power stations, and further enhances the digitalization and intelligence level of the distribution network.

[0009] In order to achieve the above object, the technical solution of the present invention is to disclose a plug-and-play information interaction method for a battery energy storage power station based on IEC61850, characterized in that it includes the following steps:

[0010] Step 1: After obtaining local authorization, the distribution network control system sends a connection request to the battery energy storage power station to obtain remote authorization.

[0011] Step 2: The battery energy storage power station performs an authorization request verification. If it fails, it returns a rejection of the connection request to the distribution network control system. If it passes, it successfully establishes a connection association with the distribution network control system.

[0012] Step 3: With remote authorization, the distribution network control system completes the registration of the remote energy storage power station through the discovery / registration mechanism.

[0013] Step 4: The distribution network control system accesses the data directory of the battery energy storage power station equipment based on the IEC61850 standard communication model;

[0014] Step 5: The battery energy storage power station responds to the data access request and implements real-time data transmission with the distribution network control system through specific operation information.

[0015] Preferably, in step 1, before sending a connection request to the battery energy storage power station, the distribution network control system needs to determine whether a connection association has been established with the current battery energy storage power station. If a connection association has been established, the device directory of the battery energy storage power station can be directly accessed and data can be transmitted.

[0016] Preferably, in step 2, the connection association refers to a communication association based on the IEC61850 standard communication model.

[0017] Preferably, in step 3, the discovery / registration mechanism reports the battery energy storage power station's own attribute information, the topology of the interoperability information model, switches, measurements, monitoring, and protection-related information to the master station, which is then parsed and converted and sent to the information interaction bus. This allows for updates and additions to the information model of devices in the distribution network, as the information model frequently changes.

[0018] Preferably, in step 3, after the distribution network control system and the battery energy storage power station complete discovery and registration, the distribution network control system needs to determine whether the version of the registered power station information model has changed: if there is no change, data can be directly transmitted with the battery energy storage power station; if there is a change, a version update or an update of the intelligent electronic device is required.

[0019] Preferably, in step 4, the device data directory access service generally obtains device related information through a hierarchical model of server, logical device layer, logical node layer and data.

[0020] Preferably, in step 4, the IEC61850 standard communication model includes two communication modes: client-server and publish-subscribe.

[0021] Preferably, in the client-server and publish-subscribe, the client and the subscriber correspond to the information model of the distribution network control system master station, and the server and the publisher correspond to the information model of the battery energy storage system.

[0022] Preferably, in step 5, the real-time data transmission service provides real-time data interaction including operation monitoring data.

[0023] Preferably, in step 5, the main types of interactive data include status information (displaying the process status or the functions assigned to the logical node class, such as the position of a circuit breaker), measurement values ​​(data objects measured in a specific process or calculated based on functions such as current, voltage, power, etc.), control values ​​(data objects changed by commands such as DER control mode), set values ​​(data objects required for functional operation, such as DER power output), etc.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. This invention standardizes the information exchange when a battery energy storage power station is connected to the power grid. This addresses the difficulties in monitoring, identification, and registration during the grid-connected operation of battery energy storage power stations, and optimizes the information flow of grid-connected operation of battery energy storage power stations.

[0026] 2. This invention takes into account the shortcomings of traditional transmission-oriented communication protocols, such as unclear data transmission meaning, lack of self-description capabilities, low communication efficiency, and high expansion and maintenance costs. It proposes a plug-and-play information interaction mechanism for battery energy storage power stations based on IEC61850, which promotes friendly interaction between the power grid and battery energy storage power stations and improves the adaptability of battery energy storage power stations in different application scenarios.

[0027] It should be noted that any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the overall framework diagram of the present invention;

[0029] Figure 2 This is a flow chart of the mechanism for realizing discovery / registration of a battery energy storage power station of the present invention;

[0030] Figure 3 This is a communication model diagram between the IEC61850-based battery energy storage system and the master station of the present invention. DETAILED DESCRIPTION

[0031] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0032] Reference Figure 1 As shown, the present invention provides a plug-and-play information interaction method for a battery energy storage power station based on IEC61850, which includes the following main steps:

[0033] 1) After obtaining local authorization, the distribution network control system sends a connection request to the battery energy storage power station to obtain remote authorization;

[0034] 2) The battery energy storage power station performs an authorization request verification. If it fails, it returns a rejection of the connection request to the distribution network control system. If it passes, it successfully establishes a connection association with the distribution network control system.

[0035] 3) The distribution network control system completes the registration of the remote energy storage power station through the discovery / registration mechanism with remote authorization.

[0036] 4) The distribution network control system accesses the data directory of the battery energy storage power station equipment based on the IEC61850 standard communication model;

[0037] 5) The battery energy storage power station responds to the data access request and realizes real-time data transmission with the distribution network control system through specific operation information.

[0038] Reference Figure 2 As shown, the battery energy storage power station discovery / registration mechanism described in the present invention involves the battery energy storage power station using a plug-and-play communication terminal to upload a device registration signal, and the power distribution master station responds to the signal and accepts the device registration information. This information structure is then compared to see if there are any differences with the terminal information stored in the master station / monitoring system. If the terminal's registration description file is identical to the terminal information stored in the master station or monitoring system, the master station remains unchanged and real-time information exchange continues. Otherwise, the dispatch terminal reads model logical nodes, data objects, data attributes, and other information from the terminal, generates or updates the terminal's basic information database, generates a topological model of the primary equipment corresponding to the device in the control center, and automatically generates the device in the Scalable Vector Graphics (SVG) system of the primary and secondary wiring diagrams.

[0039] When a new battery energy storage power station is connected to the distribution network, its self-describing file should conform to the basic data structure contained in the intelligent electronic device information flow model, that is, it includes the information header (Header) and intelligent electronic device (IED) in the SCL configuration file. The data content contained in the information header element is:

[0040] 1) Primary key (id), represented by the default configuration file, automatically generated by the system;

[0041] 2) Document version (version), which defaults to the version number of the configuration file;

[0042] 3) Name (namestructure), the default is the IED device name.

[0043] During the registration and discovery phase, the battery energy storage system not only needs to upload basic attribute information of itself to the distribution network control system master station, but also needs to upload information related to switching, measurement, monitoring, and protection to ensure the integrity of the information model.

[0044] Reference Figure 3As shown, the IEC61850 communication model described in the present invention maps corresponding data and service information to objects under other communication protocols through specific communication service mapping and the abstract communication service interface defined by the IEC61850 standard. The abstract communication service interface defines an abstract service interface for receiving / sending data, and the specific communication service mapping defines a method for mapping the interface to the protocol stack. Through the application of the abstract communication service interface and the specific communication service mapping, the IEC61850 communication model and the communication protocol can be made independent of each other. If a communication protocol upgrade occurs, only the corresponding specific communication service mapping needs to be updated. The master station and the battery energy storage power station collect data together through the information model and send it out by the abstract communication service model.

[0045] In summary, the present invention considers the shortcomings of traditional transmission-oriented communication protocols, such as unclear data transmission meaning, lack of self-description capabilities, low communication efficiency, and high expansion and maintenance costs, and proposes a plug-and-play information interaction mechanism for battery energy storage power stations based on IEC61850. This standardizes the information interaction of battery energy storage power stations connected to the power grid, addresses the difficulties in monitoring, identification, and registration during the grid-connected operation of battery energy storage power stations, and enables the battery energy storage system to move from restricted and fixed access to orderly and standardized access, promotes friendly interaction between the power grid and battery energy storage power stations, and improves the adaptability of battery energy storage power stations in different application scenarios.

[0046] The examples disclosed above are intended only to illustrate the present invention. They do not exhaustively describe all details, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These examples are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A plug-and-play information interaction method for a battery energy storage power station based on IEC61850, characterized in that: The following steps are involved: Step 1: After obtaining local authorization, the distribution network control system sends a connection request to the battery energy storage power station to obtain remote authorization. Step 2: The battery energy storage power station performs an authorization request verification. If it fails, it returns a rejection of the connection request to the distribution network control system. If it passes, it successfully establishes a connection association with the distribution network control system. Step 3: With remote authorization, the distribution network control system completes the registration of the remote energy storage power station through the discovery / registration mechanism. Step 4: The distribution network control system accesses the data directory of the battery energy storage power station equipment based on the IEC61850 standard communication model; Step 5: The battery energy storage power station responds to the data access request and implements real-time data transmission with the distribution network control system through specific operation information.

2. The plug-and-play information interaction method for a battery energy storage power station based on IEC61850 according to claim 1, characterized in that: In step 1, before sending a connection request to the battery energy storage power station, the distribution network control system needs to determine whether a connection association has been established with the current battery energy storage power station. If a connection association has been established, the device directory of the battery energy storage power station can be directly accessed and data can be transmitted.

3. The plug-and-play information interaction method for a battery energy storage power station based on IEC61850 according to claim 1, characterized in that: In step 2, the connection association refers to a communication association based on the IEC61850 standard communication model.

4. The plug-and-play information interaction method for a battery energy storage power station based on IEC61850 according to claim 1, characterized in that: In step 3, the discovery / registration mechanism reports the battery energy storage power station's own attribute information, the topology of the interoperability information model, switches, measurements, monitoring, and protection-related information to the master station. After parsing and conversion, it is sent to the information interaction bus. In response to the frequent changes in the information model of equipment in the distribution network, the information model of the equipment in the distribution network is updated and added.

5. The plug-and-play information interaction method for a battery energy storage power station based on IEC61850 according to claim 1, characterized in that: In step 3, after the distribution network control system and the battery energy storage power station complete discovery and registration, the distribution network control system needs to determine whether the version of the registered power station information model has changed: if there is no change, data can be directly transmitted with the battery energy storage power station; if there is a change, a version update or an update of the intelligent electronic device is required.

6. The plug-and-play information interaction method for a battery energy storage power station based on IEC61850 according to claim 1, characterized in that: In step 4, the device data directory access service usually obtains device-related information through a hierarchical model of servers, logical device layers, logical node layers, and data.

7. The plug-and-play information interaction method for a battery energy storage power station based on IEC61850 according to claim 1, characterized in that: In step 4, the IEC61850 standard communication model includes two communication modes: client-server and publish-subscribe.

8. The plug-and-play information interaction method for a battery energy storage power station based on IEC61850 according to claim 7, characterized in that: In the client-server and publish-subscribe models, the client and subscriber correspond to the information model of the distribution network control system master station, and the server and publisher correspond to the information model of the battery energy storage system.

9. The plug-and-play information interaction method for a battery energy storage power station based on IEC61850 according to claim 1, characterized in that: In step 5, the real-time data transmission service provides real-time data interaction including operation monitoring data.

10. The plug-and-play information interaction method for a battery energy storage power station based on IEC61850 according to claim 9, characterized in that: In step 5, the types of interaction data include status information, measurement values, control values, and set values.

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