柔性直流接入对交流系统短路电流影响机理研究

Study on the Influence Mechanism of VSC-HVDC Access on Short-Circuit Current of AC System

本文针对柔性直流输电技术应用过程中面临的对交流系统短路电流影响问题,以目前主流的采用MMC换流阀拓扑的柔性直流输电技术为分析对象,从柔直输电系统的工作原理出发,研究交流母线故障下,柔直提供短路电流产生机理,并结合实际工程案例,选取不同的控制策略仿真分析柔直工程建模。对柔性直流输电技术应用过程中的柔直控制策略设计具有一定参考意义。

Aiming at the problem of the influence of short-circuit current on AC system in the application of VSC-HVDC transmission technology,this paper takes the current mainstreamVSC-HVDC transmission technology using MMC converter valve topology as the analysis object,starts from the working principle of flexible direct transmission system,studies the mechanism of short-circuit current generation under AC bus fault,and selects different control strategies for flexible straight engineering modeling and simulation analysis based on actual engineering cases.It has certain reference significance for the design of straightening control strategy in the application of VSC-HVDC transmission technology.