交直流混合系统中交流故障对直流的影响分析

Analysis on Influence of AC System Fault in AC/DC Hybrid System on HVDC

为研究交直流混合输电系统的运行特性,提高交直流混合输电系统的运行管理水平。分析了天生桥地区交直流混合输电系统的典型故障、天广直流系统区外故障下交、直流保护动作情况和直流系统运行特性,结果表明交流系统故障下直流输电系统具有较好的稳定特性,但交、直流保护配合和直流系统保护配置存在不足,提出在考虑直流一次设备承受故障冲击能力的基础上交直流系统保护以及直流双极保护的配合问题。

AC/DC hybrid transmission system exerts important function in CHINA SOUTHERN POWER GRID. In order to analyze operating characteristic and improve operating administration level, the papers analyze operating complexion and characteristic in Tianshengqiao area. Analyzing operating characteristic of AC/DC hybrid transmission system when AC system fault occur outside of DC system through describing typical operating characteristic of converter. Protective action of AC/DC system and operating characteristic of DC system is appraised elementarily. It is put forward that DC transmission system have better stability of operation. Some questions is bring forward based on the capability of the DC primary devices for suffering fault inrush, that how to think about the cooperation between the AC and DC; system protections, and between pole Ⅰ and poleⅡ.