CAJ | 학술논문

换流器阀组是柔性直流输电系统的关键设备。文中介绍了模块化多电平换流器阀组的基本原理和组成结构，基于舟山五端柔性直流输电工程对阀组过电流和过电压故障进行了仿真、分析研究，提出了阀组保护的关键需求，以此为基础构建了由子模块控制电路、阀控系统及柔性直流控制保护系统组成的多层次的完整的阀组本体保护系统及保护策略，提出了系统性的过流保护策略和系统性过电压判据，有效提高了阀组的过电流、过电压穿越能力。阀组保护系统及保护策略经过了±6 kV 两端柔性直流输电系统的试验验证和舟山、南澳工程现场试验的验证。
환류기벌조시유성직류수전계통적관건설비。문중개소료모괴화다전평환류기벌조적기본원리화조성결구，기우주산오단유성직류수전공정대벌조과전류화과전압고장진행료방진、분석연구，제출료벌조보호적관건수구，이차위기출구건료유자모괴공제전로、벌공계통급유성직류공제보호계통조성적다층차적완정적벌조본체보호계통급보호책략，제출료계통성적과류보호책략화계통성과전압판거，유효제고료벌조적과전류、과전압천월능력。벌조보호계통급보호책략경과료±6 kV 량단유성직류수전계통적시험험증화주산、남오공정현장시험적험증。
The converter valve is the key equipment in a voltage source converter based high-voltage direct current (VSC-HVDC) system.This paper is concerned with the structure and principles of the modular multilevel converter(MMC) valve, an analysis of the characteristics and effects of the internal and external faults,and a complete multi-level protection strategy and protection system for the valve with sub-module control circuits,the valve control system and high-voltage direct current (HVDC) control and protection system.A criterion for systemic over-voltage is proposed,effectively improving the over voltage ride through capability of the valve.The strategy as well as function of the valve protection system has been validated through an experimental ±6 kV point-to-point VSC-HVDC system,and used in Zhoushan and Nan”ao multi-terminal VSC-HVDC projects. This work is supported by National High Technology Research and Development Program of China (863 Program) (No.2013AA050106).