基于双侧电源的距离保护特性的仿真和研究

Simulation and Research of Protection Features Based on Bilateral Power

介绍了电磁暂态仿真软件PSCAD的功能,论述了电力系统距离保护的基本原理和整定原则,搭建了双侧电源的输电系统距离保护的仿真模型,分析了输电系统发生故障时距离保护装置的动作特性,同时对影响距离保护正确动作的因素进行了仿真分析和研究,得出短路点过渡电阻和线路上串联电容可能会影响继电保护的正确动作率。模型得出的距离保护分析结果与理论基本一致,从而表明使用PSCAD能够很好地在继电保护中仿真应用,这为研究继电保护算法提供很好的理论研究平台。

This paper briefly introduces the functions of the electromagnetic transient simulation software PSCAD,discusses the basic principle and setting principle of distance protection of the power system,builds up a simulation model for the distance protection of the bilateral power transmission system,and analyzes the operating characteristics of the distance protection device in case of failures of the transmission system. Furthermore,it makes a simulation analysis and research on the factors that affect correct operation of distance protection and concludes that the transition resistor at the short-circuit point and the series capacitor might possibly affect the rate of correct operation of relay protection. The result of the analysis achieved from the model is basically the same as the theoretical analysis,thus proving that PSCAD can find good simulation application in relay protection,and that provides an excellent theoretical research platform for the relay protection algorithm.