Comprehensive understanding of DC pole-to-pole fault and its protection for modular multilevel converters

High Voltage

Yao Xue¹  Xiaofeng Yang¹  Zejie Li¹  Piao Wen¹ 

[1] School of Electrical Engineering, Beijing Jiaotong University;

关键词: fault diagnosis;    voltage control;    power convertors;    power capacitors;    equivalent circuits;    HVDC power transmission;    HVDC power convertors;    power transmission faults;    modular multilevel converter;    promising voltage source converter topologies;    high-voltage direct current transmission;    direct current short-circuit faults;    high discharge current stress;    simplified equivalent circuits;    normal DC fault operation conditions;    MMC fault;    fault energy distribution principles;    detailed comparative study;    existing DC fault;    rigid blocking blocking methods;    flexible blocking methods;    MMC DC fault protection schemes;    HVDC transmission system;    comprehensive understanding;    DC pole-to-pole fault;   

DOI  :  10.1049/hve.2018.5045

来源: DOAJ

【 摘 要 】

A modular multilevel converter (MMC) is one of the promising voltage source converter topologies in the field of high-voltage direct current (HVDC) transmission. MMCs are vulnerable to the direct current (DC) short-circuit faults due to the high discharge current stress. This study first introduced the simplified equivalent circuits of MMCs under both normal and DC fault operation conditions. Then the MMC fault spread loops and fault energy distribution principles are presented. Moreover, a detailed comparative study of the existing DC fault handling schemes, which are classified as the rigid blocking and flexible blocking methods are carried out. It provides a technical reference for further study on the MMC DC fault protection schemes for the HVDC transmission system.

【 授权许可】

Unknown