稳定控制装置故障跳闸判据在特高压交流电网中的应用

特高压电网对稳定控制装置的正确动作提出了更高要求。搭建了特高压交流输电线路仿真模型,分析了目前稳控装置中普遍使用的故障跳闸判据在特高压电网中的适应性,指出在线路对侧发生故障时此判据可能会出现拒动的问题。基于特高压输电线路发生故障跳闸后电气量的独特特性,提出了结合零序电流的单相故障跳闸新判据,以及结合相间余弦电压Ucos()???的相间故障跳闸新判据。利用RTDS实时数字仿真系统验证了判据的有效性和可靠性,实验结果表明:改进后的故障跳闸判据正确、可靠、有效。

Application of stability control device fault tripping criterion in UHV AC grid

UHV AC grid makes higher requests to stability control devices. An electromagnetic transient model is set up for UHV transmission line, and the adaptability of the traditional stability control devices fault tripping criteria is analyzed. When a fault occurred at the opposite side of a transmission line, the problems which traditional criteria may encounter are presented. Based on the unique fault characteristics of UHV transmission lines, an improvement single phase to ground fault tripping method considering zero sequence current is proposed, and a new phase to phase fault tripping method considering is also suggested. Real-time digital simulation (RTDS) tests are carried out to validate the new methods, the results show that the improved methods are correct, reliable and effective.