可再生能源2017，Vol.35Issue(1)：43-49,7.
MMC-MTDC线路双极永久性故障快速识别方法研究
A fast bipolar permanent fault identification approach for MMC-MTDC lines
摘要
Abstract
MMC based multi-terminal HVDC (MMC-MTDC) has application prospects in grid connection and power transmission of wind power,photovoltaic and other renewable energy.When a bipolar fault occurs in MMC based multi-terminal HVDC (MMC-MTDC) systems that use halfbridge sub-modules and DC breakers,the faulted line must be tripped by DC breakers.If an instantaneous fault is identified immediately after the breakers are tripped,the MMC-MTDC system can be restored to stable operation by reclosing the breakers quickly.Therefore,fast permanent fault identification is beneficial to the operational stability of MMC-MTDC system and renewable energy system.By analyzing the characteristics of DC line voltage under different fault conditions (permanent fault,instantaneous fault and protection mal-operation),it is found that the difference between positive pole voltage and negative pole voltage of the line with permanent faults is zero,while that of the line with instantaneous faults is not zero.According to this feature the permanent fault can be identified.Furthermore the robust locally weighted regression approach is used in this paper to realize the fast permanent fault identification in transient process.关键词
多端柔性直流/直流断路器/永久性故障/强局部加权回归Key words
MMC-MTDC/DC breaker/permanent fault/robust locally weighted regression分类
信息技术与安全科学引用本文复制引用
王帅,毕天姝,李伟,贾科..MMC-MTDC线路双极永久性故障快速识别方法研究[J].可再生能源,2017,35(1):43-49,7.基金项目
国家重点研发计划智能电网技术与装备重点专项(2016YFB0900203) （2016YFB0900203）
国家自然科学基金项目(51627811) （51627811）
高等学校学科创新引智计划计划项目(B08013). （B08013）
