Research On On-line Setting And Assessment Early Warning Of Relay Protection In Regional Grid

The protection issues have made new demands with the advancement of technology and the rapid development of power systems. It has been continuously injected new vigor to the protection technology that electronic technology, computer technology and the rapid development of communication technology and technology development. Setting calculation of relay protection is the infrastructure work to ensure the safe operation of modern large-scale grid. The existing pattern of off-line have some inevitable drawbacks. When to achieve setting calculation of On-Line, some new setting calculation principles and configuration requirements should be established.The relay protection should meet the selectivity, sensitivity requirements, and also to improve adaptability. To achieve on-line setting calculation of relay protection should establish setting calculation of network, to extract from grid model and parameter, and to recognite power system operation status. This is bound to solve the interface and unified platform issues of on-line setting calculation system and SCADA, WAMS data; because massive data of grid and large-scale interactive and on-line calculation must be calculated in the existing software, the grid of theory can be strongly applicated.With the internationalization development of the domestic electrical products and the relevant IEC standards constantly being introduced, digested, absorpted, the relevant safety standards and requirements get more and more concern and attention. The basic of on-line assessment early warning and relay protection is founded through the analysis and understanding of the relevant standards. Relay protection have a significant impact on the power system operation and stability, as the sentinel of safe and stable operation in power system. Therefore, the assessment of relay protection is that people have been the focus of attention and study. The important aspects of assessment contain that setting of reasonable protection and protection action is reasonable or not after the behavior.In order to satisfy the requirements of Security and stability of power grid analysis for on-line, the power system static security analysis, voltage security analysis, transient analysis, and setting security checking and other sub-issues can be comprehensively studying. It has established a complete network of relay protection setting calculation and valuation management system and construction the value of the prefecture and county of Shijiazhuang management integration system. The system has been applied to the grid in Shijiazhuang,in order to the operating personnel from the off-line analysis of the line from "empirical" Scheduling to’smart’scheduling change provides a good platform and supporting tools.