CN115865556A - Power system distributed communication scheme adopting virtual bus technology - Google Patents

Abstract

The invention relates to a power system distributed communication scheme adopting a virtual bus technology, which is characterized in that a high-efficiency distributed coordination control framework with mutual interaction of distributed intelligent nodes and an Internet of things communication protocol with high reliability and high real-time performance are obtained by fusing a virtual bus and an IEC-61850 model. Compared with the existing power system communication technology, the intelligent terminal and the method have the advantages that the intelligent terminals are interconnected and intercommunicated, important information can be shared on the spot, the real-time performance and the reliability of information interaction are improved, and the automatic networking among communication devices and the plug-and-play function of the devices are realized. The scheme improves the effective throughput of the system, and plays a good decoupling role on the service module of the system on the premise of ensuring the response speed of the service request when the system works in a system with complex service.

Description

Distributed Communication Scheme of Power System Using Virtual Bus Technology

technical field

The invention relates to power system communication, in particular to a power system distributed communication scheme using virtual bus technology.

Background technique

The communication architecture of the traditional distribution network, using the 101/104 communication protocol, can no longer meet the communication needs of the new power system. The diversification and distribution of energy sources require the smart terminal of the power grid not only to have information collection and aggregation and edge computing capabilities, but also to have immediate Plug and play capability. In order to solve the interconnection problem of hardware and software systems in a distributed heterogeneous environment, OMG (object management group, object management organization) proposed CORBA (Common Object Request Broker Architecture, common object request architecture). It provides an interoperability standard for object-oriented applications and is a system specification for object-oriented applications. As a relatively mature distributed object-oriented technology, CORBA provides a flexible communication activation mechanism and the ability to seamlessly connect multiple object systems for distributed heterogeneous object-oriented computing environments. It is very suitable for open The rapid construction of services in the environment and the effective management of resources and services. The CORBA system defines a set of interface specifications. As long as any application program, software system or tool has an interface definition that conforms to the interface specification, it can be easily integrated into the CORBA system and has good versatility. Figure 1 shows the process of information call using this architecture. This architecture also has shortcomings. The CORBA system does not have a plug-and-play function, and the user needs to configure it in advance when using it.

Microsoft's DCOM (Distributed Component Object Model, Distributed Component Object Model) technology can also realize the function similar to the soft bus, but because DCOM is independently developed by Microsoft and based on the Windows system, when faced with multi-vendors, There are compatibility problems in the application environment of multiple devices, which makes the DCOM technology unable to be widely used. There is also a method of building a soft bus using message queues to realize information interaction between subjects in a distributed system, but limited to the real-time problem of message queues, it cannot be directly applied to the multi-subject cooperative control system of a virtual power plant.

It can be seen that the real-time and reliability of existing distributed communication technologies such as CORBA and DOCM cannot meet the information interaction requirements of multiple subjects in the virtual power plant.

Contents of the invention

The purpose of the present invention is to provide a distributed communication of power system using virtual bus technology for the existing distributed communication technologies such as CORBA and DOCM. plan.

Technical solution of the present invention is:

The power system distributed communication scheme adopts virtual bus technology, which integrates the distributed coordination control architecture of efficient distributed intelligent nodes and the fusion of virtual bus and IEC-61850 model to obtain high reliability and high real-time physical Networking communication protocol, this solution enables smart terminals to have information collection and aggregation and edge computing capabilities, and smart terminals applying this solution have plug-and-play capabilities.

The technical effect of the present invention is: compared with the existing power system communication technology, it enables the interconnection and intercommunication between intelligent terminals, can share important information on the spot, improves the real-time performance and reliability of information interaction, and also realizes communication equipment Automatic networking between devices, as well as the plug-and-play function of the device. The existing remote call method of the power system framework usually uses the HTTP protocol for communication, and a TCP connection needs to be established for each call, and each request and response will carry some invalid fields, which affects the efficiency of service calls. However, the distributed coordination control architecture proposed in this scheme customizes the data transmission format, which improves the effective throughput of the system. When working in a system with complex business, under the premise of ensuring the response speed of service requests, the system’s The business module plays a very good decoupling role, thereby improving the reliability and real-time performance of communication. The existing power system communication technology equipment needs to be configured in advance by the user in order to form a network, but the technology provided by this solution can automatically form a network for information exchange when the equipment enters the communication range.

By applying this model in the power system, it is found that the communication reliability and real-time performance of this model are greatly improved compared with the traditional power system communication technology, and it also has the functions of automatic networking and plug-and-play of communication equipment. Each communication device can be used as a smart terminal. Once other devices enter the communication range, they can automatically connect to the smart terminal for information exchange.

It is a communication solution that meets the communication requirements of the new power system and provides technical support for the reliable operation of the new power grid. Through the use case of the network access configuration process of the intelligent terminal, based on the distributed energy storage use case of the proposed communication scheme, the effect of reliable transmission of distributed information with plug-and-play function is verified.

Description of drawings

Fig. 1 is a schematic diagram of the implementation process of the general object request framework of the embodiment of the present invention;

FIG. 2 is a schematic diagram of a new program access implementation framework according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a distributed coordination control architecture according to an embodiment of the present invention;

Fig. 4 is the fusion schematic diagram of virtual bus and IEC-61850 model of the embodiment of the present invention;

Fig. 5 is a flow chart of realizing the plug-and-play capability between the terminal and the master station according to the embodiment of the present invention.

Detailed ways

The implementation of the distributed communication scheme of the power system using virtual bus technology includes an efficient distributed coordination control framework for mutual interaction of distributed intelligent nodes and a highly reliable and real-time Internet of Things obtained by the fusion of virtual bus and IEC-61850 model communication protocol for the implementation of these two technologies.

1. The implementation process when using CORBA (Common Object Request Architecture) for information calling is shown in Figure 1. The client can make a local call directly through CORBA, or make a remote call after connecting two CORBAs through the Internet.

2. Introduce the soft bus according to the CORBA model and manage it in a multi-layer manner. Then when new network services are added, the new application can be easily combined with the original system. The implementation framework is shown in Figure 2. Through Any module in the bus, any application, no matter what function it has, as long as it follows the "bus" interface standard, it can be directly integrated into the system environment, and perform various types of information interactions with other applications to achieve data integration and Communication between modules.

3. On the basis of this architecture, an efficient distributed coordination control architecture for mutual interaction of distributed intelligent nodes is obtained. As shown in Figure 3, end devices can use private protocols (Modbus, DNP, etc.) or unified standard protocols, Data interaction with edge devices through adapters; edge devices distribute data through distributed message bus according to the Internet of Things protocol (DDS), and exchange data with the front of the master station, SCADA (data acquisition and monitoring control system) and other edge devices through adapters , the above forms a complete information interaction architecture. Among them, the terminal and edge devices are intelligent terminals that integrate the communication technology of the Internet of Things. IEC61850 modeling technology is used to form a public model with standardized semantics, and information is easy to exchange without ambiguity. A distributed coordinated control architecture is an architecture that allows distributed intelligent nodes to interact with each other. The distributed coordination architecture supports field-based applications, which support scalable point-to-point publish/subscribe information, and use centralized and distributed logic to coordinate system and terminal data. When exchanging data between the edge devices of the distribution network and its distribution master station, the field message bus (field message bus, FMB) is used to distribute data for communication. Each node is defined as an edge agent gateway, which communicates with intelligent devices such as on-site intelligent terminals and inverters, and communicates with the master station. The distributed coordinated control architecture can reduce information delay and make distributed communication possible.

4. The virtual bus technology can enable multiple intelligent terminals to self-discover and self-organize the network, and can also complete heterogeneous network networking. On the other hand, this technology simplifies the traditional seven-layer transmission protocol to four layers, which improves the information exchange rate . IEC-61850 is a public communication standard applied to smart substations. Through a series of standardization of equipment, the communication unification of the whole station is achieved. By applying this technology to model the above-mentioned smart terminals, the virtual bus technology and IEC- The 61850 model is fully integrated, and finally a high-reliability, high-real-time Internet of Things communication protocol is proposed to realize the mapping.

It models IEC-61850 according to the modeling standard of the virtual bus, and models the virtual bus according to the modeling standard of IEC-61850, so that the two models have the capability of fusion, as shown in Figure 4, the two models are fused The specific plan is: ① New modeling: Add new modeling to the parts that are missing from each other in the virtual bus model and the IEC-61850 model according to its own modeling style; ② Association: For some objects that have corresponding models for both ③Modification: For some object parts that are better described by the IEC-61850 model, IEC-61850 is used as the standard, and the corresponding model is modified according to the virtual bus modeling style, and some objects are better described by the virtual bus model The object part, based on the virtual bus technology, modifies the corresponding model in IEC-61850 according to the IEC-61850 modeling style; ④ Extension: For the part that is not in the virtual bus and IEC-61850 model, it needs to be expanded at the same time, according to its own New modeling style; ⑤ Supplement: Supplement the missing part of the enumeration. ⑥Deletion: Delete the useless parts after the fusion of the two models.

5. After the implementation of the above scheme is completed, the smart terminal will have the ability to plug and play, and the smart terminals will be interconnected, and important information can be shared on the spot under the premise of ensuring high reliability and high real-time performance. The specific implementation steps are shown in Figure 5, which are divided into five processes: ① Deployment of IoT front-end processor: complete the mapping between the master station model and the terminal model in the Internet of Things communication protocol DDS to support the edge-cloud between the terminal and the master station Communication, edge-to-edge communication between terminals. ②Association configuration: configure the terminal for production and generate a self-describing file. The front-end processor of the Internet of Things associates the terminal with the primary equipment, such as the position and function of the terminal in the feeder group. ③ Automatic registration: When the terminal is connected to the feeder group, it will automatically send the registration file to the front-end processor of the Internet of Things for registration. Compare the information with the master station model and automatically identify it. The front-end processor generates a configuration file, such as a topology file, and sends it to the terminal for configuration, reconfiguration, or no operation. ④ Change update: When the main station model changes, the terminal automatically synchronizes the changed model of the main station, identifies the change, and requests an update from the front-end processor of the Internet of Things. After the front-end processor matches the master station model with the terminal model, the terminal automatically resends the registration application to the IoT front-end processor, and sends a registration file for registration to realize configuration update. ⑤Result notification: After the configuration is completed, the front-end processor notifies the configuration result to the master station and all terminals.

After the terminal is successfully connected to the feeder group, a plug-and-play process is run between the terminal and the main station to realize data interaction between the terminal and the main station; at the same time, terminals in the same feeder group recognize each other to realize side-to-side communication network real-time data interaction. After the terminal realizes plug and play, it can greatly reduce the operation, maintenance and debugging work of the distribution network.

Claims (2)

1. The distributed communication scheme of power system using virtual bus technology is characterized in that it combines the distributed coordination control architecture of efficient distributed intelligent nodes interacting with each other and the high reliability obtained by the fusion of virtual bus and IEC-61850 model , High real-time Internet of Things communication protocol, this solution can enable smart terminals to have information collection and aggregation and edge computing capabilities, and smart terminals using this solution have plug-and-play capabilities. 2. The power system distributed communication scheme adopting virtual bus technology as claimed in claim 1, characterized in that it models IEC-61850 according to the modeling standard of virtual bus, and models virtual bus according to the modeling standard of IEC-61850 The bus is modeled to enable the two models to have the ability to integrate. The specific plan for the fusion of the two models is as follows: ① New modeling: the missing parts of the virtual bus model and the IEC-61850 model are newly created according to their own modeling style. Add modeling; ②Association: associate parts of some objects that both have corresponding models; ③Modify: use IEC-61850 as the standard for some object parts that are better described by the IEC-61850 model, according to the virtual bus Modify the corresponding model in the modeling style, and also modify the corresponding model in IEC-61850 according to the IEC-61850 modeling style for some object parts that are better described by the virtual bus model; The parts that are not in the bus and IEC-61850 models need to be expanded at the same time, and newly created according to their own modeling style; ⑤ Supplement: Supplement the missing part of the enumeration; ⑥ Delete: Delete the useless part after the fusion of the two models .

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