主动式饱和铁心型超导限流器对超高压输电线路零序电流保护的影响
Coordination of the Active Saturated Iron-core Superconductive Fault Current Limiters with Zero-sequence Current Protection of Transmission Lines
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摘要: 随着短路电流水平不断增加,传统的限流措施己经很难满足现代电力系统发展的需要。超导限流器是解决电网短路电流的有效措施之一。目前,天津220 kV超导限流器和昆明普吉35 kV超导限流器已经投入运行,500 kV高温超导限流器技术也进入样机研发阶段。500 kV超导限流器研制和挂网示范运行后,将取得在超高压等级超导限流技术的世界领先地位。本文对主动式饱和铁心型超导限流器的工作原理及其技术优点进行了详细介绍,针对其接入500kV超高压输电线路后对零序电流保护的影响进行了详细的分析论证,并在PSCAD/EMTDC仿真平台搭建相应的仿真模型,仿真结果良好的论证了理论分析。Abstract: A 500 kV Saturated Iron-core Superconductive Fault Current Limiter (SISFCL) has been designed to be installed in an EHV transmission system in southern China. We carried out studies on compatibility and coordination problems in the application of this kind of device in an EHV network. In this paper, the operational principle of an SISFCL and the protection configuration of transmission lines are briefly introduced. The influence of an SISFCL on the zero-sequence current protection of the grid, taking into consideration both the fault of SISFCL itself and fault of the power lines, is discussed. In order to coordinate the SISFCL and the grid protection scheme, requirements and recommendations are proposed. A model of a 500 kV double-circuit transmission system with SISFCLs is built using Electromagnetic Transient Program including DC (EMTDC) software package. The simulation results are in good agreement with the theoretical analyses.
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