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

Power system distributed communication scheme adopting virtual bus technology

Technical Field

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

Background

The communication framework of the traditional power distribution network adopts a 101/104 communication protocol, so that the communication requirement of a novel power system cannot be met, the energy source is diversified and distributed, and the power grid intelligent terminal is required to have the capabilities of information acquisition, information aggregation and edge calculation and plug and play. To solve the interconnection problem of hardware and software systems in the distributed heterogeneous environment, OMG (Object management group) proposes CORBA (Common Object Request Architecture). The interoperation standard of the object-oriented application is provided, and the object-oriented application is a system specification of the object-oriented application. CORBA, as a relatively mature distributed object-oriented technology at present, provides a flexible communication activation mechanism and the capability of seamlessly connecting a plurality of object systems for a distributed heterogeneous object-oriented computing environment, and is very suitable for the rapid construction of services and the effective management of resources and services in an open environment. The CORBA system defines a group of interface specifications, and any application program, software system or tool can be conveniently integrated into the CORBA system only by having the interface definitions conforming to the interface specifications, so that the CORBA system has better universality. Fig. 1 shows an information calling process performed by applying the architecture. The CORBA system has the defects that the CORBA system does not have a plug-and-play function, and needs to be configured in advance by a user during specific use.

The microsoft DCOM (Distributed Component Object Model) technology can also realize functions similar to a soft bus, but because the DCOM is independently developed by microsoft corporation and is based on a Windows system, when the application environment of multiple vendors, multiple systems and multiple devices is faced, the DCOM technology has compatibility problems, and thus the DCOM technology cannot be applied in a large quantity. The method also has the problem that the information interaction between the main bodies in the distributed system is realized by constructing a soft bus in a message queue mode, is limited to the real-time performance of the message queue, and cannot be directly applied to a multi-main-body cooperative control system of a virtual power plant.

Therefore, the real-time performance and the reliability of the conventional distributed communication technologies such as CORBA and DOCM cannot meet the information interaction requirements of multiple main bodies in the virtual power plant.

Disclosure of Invention

The invention aims to provide a distributed communication scheme of an electric power system by adopting a virtual bus technology, aiming at the defect that the real-time performance and the reliability of the existing distributed communication technologies such as CORBA and DOCM cannot meet the information interaction requirements of multiple main bodies in a virtual power plant.

The technical solution of the invention is as follows:

the scheme can enable the intelligent terminal to have information acquisition and convergence and edge computing capability, and the intelligent terminal applying the scheme has plug and play capability.

The invention has the technical effects that: 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 existing remote invocation mode of the power system framework usually adopts an HTTP protocol for communication, a TCP connection needs to be established for each invocation, and each request and response carries a part of invalid fields, so that the service invocation efficiency is influenced. The distributed coordination control framework provided by the scheme is self-defined on the transmission format of data, the effective throughput of the system is improved, and when the distributed coordination control framework works in a system with complex service, a good decoupling effect is achieved on a service module of the system on the premise of ensuring the response speed of a service request, so that the reliability and the real-time performance of communication are improved. The existing power system communication technology equipment needs to be configured in advance by a user when networking is needed, and the technology provided by the scheme can automatically perform networking for information interaction when the equipment enters a communication range.

Through applying the model in the power system, the communication reliability and the real-time performance of the model are greatly improved compared with the traditional power system communication technology, the model also has the functions of automatic networking and plug-and-play of communication equipment, each communication equipment can be used as an intelligent terminal, and once other equipment enters a communication range, the intelligent terminal can be automatically networked, so that information interaction is carried out.

The novel power grid communication scheme is a communication scheme meeting the communication requirement of a novel power system, and provides technical support for reliable operation of a novel power grid. The distributed energy storage case based on the communication scheme verifies the effect of reliable transmission of distributed information with a plug-and-play function through the network access configuration flow case of the intelligent terminal.

Drawings

FIG. 1 is a flow chart illustrating an implementation of a generic object request architecture according to an embodiment of the present invention;

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

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

FIG. 4 is a schematic diagram illustrating the fusion of a virtual bus and an IEC-61850 model according to an embodiment of the present invention;

fig. 5 is a flowchart of implementing plug and play capability between a terminal and a master station according to an embodiment of the present invention.

Detailed Description

The implementation of the power system distributed communication scheme adopting the virtual bus technology comprises an efficient distributed coordination control framework with mutual interaction of distributed intelligent nodes and an implementation of an Internet of things communication protocol with high reliability and high real-time performance, which is obtained by fusing a virtual bus and an IEC-61850 model.

1. The flow of information calling using CORBA (common object request architecture) is shown in fig. 1. The client can directly carry out local calling through the CORBA, and can also carry out remote calling after connecting the two CORBAs through the Internet.

2. The soft bus is introduced according to the CORBA model, management is carried out in a multi-layer mode, when new network service is added, new application can be easily combined with an original system, a realization framework is shown in figure 2, any application program can be directly integrated into a system environment through any module in the bus regardless of the function, and can carry out various types of information interaction with other application programs as long as the bus interface standard is followed, and data integration and communication among modules are realized.

3. On the basis of the framework, an efficient distributed coordination control framework with mutual interaction of distributed intelligent nodes is obtained through expansion, as shown in fig. 3, end equipment can perform data interaction with edge equipment through an adapter through a proprietary protocol (Modbus, DNP and the like) or a unified standard protocol; the edge device distributes data through a distributed message bus according to an internet of things protocol (DDS), and performs data interaction with the front-end master station, the SCADA (supervisory control and data acquisition system) and other edge devices through adapters, so that a complete information interaction architecture is formed. The terminal and the side equipment are intelligent terminals fusing the communication technology of the Internet of things, and a common model of standard semantics is formed by using the IEC61850 modeling technology, so that information is easy to exchange and no ambiguity is generated. The distributed coordination control architecture is an architecture that allows distributed intelligent nodes to interact with each other. The distributed coordination architecture supports field-based applications that support scalable point-to-point publish/subscribe information, coordinating data of the system with the terminals using centralized and distributed logic. When data interaction is carried out between the edge devices of the power distribution network and with the power distribution main station of the power distribution network, a Field Message Bus (FMB) is used for distributing data for communication. Each node is defined as an edge proxy gateway, communicates with intelligent equipment such as a field intelligent terminal and an inverter, and communicates with a master station. The distributed coordination control architecture can reduce information delay and enable distributed communication.

4. The virtual bus technology can enable a plurality of intelligent terminals to discover self-networking and can also complete heterogeneous network networking, and on the other hand, the technology simplifies the traditional seven-layer transmission protocol into four layers, so that the information interaction rate is improved. The IEC-61850 is a public communication standard applied to the intelligent substation, the communication unification of the whole station is achieved by a series of standardization of equipment, the intelligent terminal is modeled by applying the technology, the virtual bus technology and the IEC-61850 model are fully fused, and finally, the Internet of things communication protocol with high reliability and high real-time performance is provided to realize mapping.

According to the modeling standard of the virtual bus, the IEC-61850 is modeled, and according to the modeling standard of the IEC-61850, the virtual bus is modeled, so that the two models have the fusion capability, and as shown in FIG. 4, the specific scheme for the fusion of the two models is as follows: (1) newly adding modeling: newly modeling the mutually lacked parts of the virtual bus model and the IEC-61850 model according to the modeling style of the newly-added parts; (2) and (3) association: associating portions of certain objects that both have a corresponding model; (3) modifying: modifying the corresponding models of some object parts which are better described by using the IEC-61850 model according to the virtual bus modeling style by using the IEC-61850 as a standard, and modifying the corresponding models in the IEC-61850 according to the IEC-61850 modeling style by using the virtual bus technology as a basis for some object parts which are better described by using the virtual bus model; (4) expanding: parts which do not exist in the virtual bus and the IEC-61850 model need to be expanded simultaneously, and are built according to the modeling style of the parts; (5) supplementation: additions are made to enumerate the missing parts. (6) And (3) deleting: and deleting useless parts after the two models are fused.

5. After the implementation of the scheme is completed, the intelligent terminals have the plug-and-play capability, and the intelligent terminals are interconnected and intercommunicated, so that important information can be shared on the spot on the premise of ensuring high reliability and high real-time performance. The specific implementation steps are shown in fig. 5, and are divided into five processes: (1) deploying an Internet of things front-end processor: and completing the mapping of the master station model and the terminal model in the communication protocol DDS of the Internet of things so as to support the edge-cloud communication between the terminals and the master station and the edge-edge communication between the terminals. (2) And (3) association configuration: and carrying out production configuration on the terminal to generate a self-description file. And associating the terminal with primary equipment, such as the position and the function of the terminal in a feeder group, in the front-end processor of the Internet of things. (3) Automatic registration: and when the terminal is accessed to the feeder group, automatically sending a registration file to the front-end processor of the Internet of things for registration. And comparing the information with the master station model, and automatically identifying. The front-end processor generates a configuration file, such as a topology file, and sends the configuration file to the terminal for configuration, reconfiguration or no operation. (4) Updating the transaction: when the master station model is abnormal, the terminal automatically synchronizes the changed master station model, identifies the change and requests the Internet of things front-end processor for updating. After the front-end processor matches the master station model with the terminal model, the terminal automatically resends a registration application to the front-end processor of the Internet of things, and sends a registration file for registration, so that configuration updating is realized. (5) And (4) result notification: after the configuration is completed, the front-end processor notifies the configuration result to the master station and all the terminals.

After the terminal is successfully accessed into the feeder group, a plug-and-play process is operated between the terminal and the main station so as to realize data interaction between the terminal and the main station; meanwhile, terminals in the same feeder group are mutually identified, and real-time data interaction under the edge-edge communication network is realized. After the terminal is plugged and used, operation and maintenance debugging work of the power distribution network can be greatly reduced.

Claims (2)

1. Adopt virtual bus technology's electric power system distributed communication scheme, its characterized in that: the scheme enables the intelligent terminal to have information acquisition and convergence and edge computing capabilities, and the intelligent terminal applying the scheme has plug-and-play capabilities.

2. The distributed communication scheme for electric power systems 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, so that the two models have the capability of merging, and the specific scheme for merging the two models is as follows: (1) newly adding modeling: newly modeling the mutual lacking part of the virtual bus model and the IEC-61850 model according to the modeling style of the newly added part; (2) and (3) association: associating portions of certain objects that both have a corresponding model; (3) modifying: modifying the corresponding models of some object parts which are better described by using the IEC-61850 model according to the virtual bus modeling style by using the IEC-61850 as a standard, and modifying the corresponding models in the IEC-61850 according to the IEC-61850 modeling style by using the virtual bus technology as a basis for some object parts which are better described by using the virtual bus model; (4) expanding: parts which do not exist in the virtual bus and the IEC-61850 model need to be expanded simultaneously, and are built according to the modeling style of the parts; (5) supplementation: supplement to enumerate missing parts; (6) and (3) deleting: and deleting useless parts after the two models are fused.

Images