Research And Application On Several Key Techniques Of Intelligent Substation

In the early 21st century, the proposition of Smart Grid broke new ground in the field of safety and reliability, high quality and efficiency, green environmental protection for the power industry around the world. Intelligent Substation, as the physical basis of Smart Grid, would go through the entire process of smart grid construction.This paper analysis the technical content and characteristics of Intelligent Substation, based on certain 220kV substation projects which is being entrusted by the State Grid Corporation. Some key technologies, such as process bus, non-conventional instrument transformer, high-precision clock synchronization, state monitoring, testing and verifying environment, are all mainly studied from the viewpoint of application. The main task of this paper is as follows:In chapter I, the technical content and characteristics of intelligent substation are analyzed based on a thorough review of the development of conventional substation automation system. And then, the key technologies of intelligent substation ,including process bus, non-conventional instrument transformer, intelligent switching equipment, on-line monitoring are proposed, which lay the foundation for following analysis.In Chapter II, the key technologies as reliability, security of process bus are studied. The combination of equipment redundancy and link redundancy for reliability of substation is proposed. And also quantitatively analysis the reliability of different network topology. After reviewing the security threats of process bus, a safety technology of substation process bus which combined system architecture-based security policy and communication date-based security policy is proposed.In chapter III, based on the comparative study of working principle the of Non Conventional (electronic) Instrument Transformer and the communication standards of digital interface, the transient behaviors of Rogowski coil and optical transformer were studied and compared. With this, the applications programme of electronic instrument transformer in 220kV intelligent substation was designed.In chapter IV, the applications programme of IEEE 1588 in intelligent substation was proposed from the viewpoint of the whole station and network, based on the in-depth analysis of IEEE 1588,to make a reference for the engineering applications of IEEE 1588.In Chapter V , the characteristics and demands of station level network, sampling transmission network and GOOSE transmission network, the network constructions and other related issues were in-depth studied. The network forming scheme and node distribution planning in station level network and process level network were offered. Synchronous setting network and Network redundancy program were all discussed.In Chapter VI, the framework of Intelligent Substation on-line monitoring system, especially the function, structure and working principle were researched. with the certain 220kV Intelligent substation project. A typical applications programme of Intelligent Substation on-line monitoring system to reconcile both technological developments and actual needs was offered.In Chapter VII, Considering the realization of most automation functions in Intelligent Substation rely on communication, hardware and software emulation modules, which have the same working mechanism, communication interface and communication behavior with actual equipment, were exploited. Such as protection, monitoring, merging unit, Intelligent Circuit Breaker,etc. And these emulation modules can be combined with LAN to construct simulation test environment correspond to substation. In this environment, design solutions, automation functionality, performance testing and other technical problems can be dynamically simulated and verified.