MMC_HVDC系统直流侧故障暂态特性分析_杨海倩.pdf

40 1 Vol. 40 No. 1 2016 1 Power System Technology Jan. 2016 1000-3673201601-0040-06 TM 71 A 470·40 MMC-HVDC 100044 Analysis on Transient Characteristic of DC Transmission Line Fault in MMC Based HVDC Transmission System YANG Haiqian, WANG Wei, JING Long, WU Xuezhi (National Active Distribution Network Technology Research Center, Haidian District, Beijing 100044, China) ABSTRACT: In recent years, research on modular multilevel RT-LAB converter (MMC) mainly focuses on system modeling and MMC-HVDC simulation and design of control system both in China and abroad. Research on DC line fault of MMC based HVDC system is only in simple qualitative simulation analysis. In order to quantitatively analyze transient characteristics of electrical stress in DC side of MMC-HVDC system more accurately, equivalent circuit models of DC transmission line MMC-HVDC breaking fault, monopolar grounding fault and pole-to-pole fault are established respectively. Mechanism of DC side fault DOI 10.13335/j.1000-3673.pst.2016.01.006 is analyzed, and mathematical expression of fault voltage and current is deduced. A 2-terminal MMC-HVDC system is 0 established in RT-LAB and simulation results of fault transient analysis are verified. Monopolar grounding fault makes (modular multilevel non-fault pole to ground voltage and phase voltage of AC side converterMMC)2002 A.