电阻型超导限流器和10kV配电网继电保护相配合的仿真分析

短路电流的增大已经成为高电压等级电网建设和运行中的一个突出问题.超导限流器是目前最为理想的限流装置,而其与现有继电保护装置的配合是超导限流器挂网运行的关键技术之一.利用PSCAD/EMTDC仿真软件搭建了电阻型超导限流器和继电保护装置的自定义模型,在此基础上分析了引入电阻型超导限流器对10kV配电网电流保护的影响,并对两者的配合问题进行了仿真研究,进一步提出通过改变超导体参数来调整电阻型SFCL的限流电阻和限流水平,以实现与继电保护协调配合,为超导限流器应用于实际电网参数配置提出了重要的量化依据.

Simulation of Co-ordination of Resistive-type Superconducting Fault Current Limiter and Relay Protection in 10 kV Distribution Network

The increase of short-circuit current has become an important issue in high-voltage power grid construction and operation.Superconducting fault current limiter(SFCL)is one of the most ideal current limiting devices in modern power network.However,the co-ordination between SFCL and relay protection is an important technologies and is crucial for SFCL to be successfully applied to real power network.In this paper,a combined numerical model with both resistive type SFCL module and current-relay protection module is developed using simulation software PSCAD/EMTDC.This model is used to study the effect of SFCL on relay protections and the co-ordination between SFCL and relay protections in 10 kV distribution gird.The solution of limiting the current level is further presented in this paper by adjusting the parameters of SFCL model to achieve the co-ordination between SFCL and relay protections.The final result in this paper could provide important quantitative basis of parameters for SFCL to be applied in real power system.