摘要
现有柔性直流工程中采用的半桥型模块化多电平换流器具有较高的经济效益,但不具备直流故障清除能力。文中介绍了一种具备直流故障清除能力的桥臂阻尼故障恢复系统,并提出基于桥臂阻尼的直流故障恢复方案。该故障恢复方案通过单极和双极故障选线策略选择故障线路,采用桥臂阻尼和谐振开关配合,分别实现故障电流快速抑制以及故障线路的切除,最终使健全的柔性直流系统在最短的时间内重新恢复运行。为了验证故障恢复方案的有效性,采用PSCAD/EMTDC建立了五端柔性直流模型。仿真结果表明了所提出的故障恢复方案的可行性和有效性。
The half-bridge modular multilevel converter（MMC）used in existing flexible high voltage direct current（HVDC）projects has high economic benefits,but no ability of DC fault clearance.This paper introduces a kind of arm damping fault recovery system with the ability of DC fault clearance.A strategy of the fault recovery system is proposed,which uses a monopolar and bipolar fault line selection strategy to select the fault line.And arm damping and resonance-switch is adopted to achieve fault current fast inhibition and fault line isolation,respectively.By using the proposed strategy,the healthy system can resume operation in the shortest possible time.To verify the effectiveness of the fault recovery strategy,a five terminal flexible HVDC model is built using PSCAD/EMTDC.Simulation results show the feasibility and effectiveness of the proposed fault recovery scheme.
出处
《电力系统自动化》
EI
CSCD
北大核心
2016年第24期85-91,共7页
Automation of Electric Power Systems
基金
国家电网公司科技项目"±500kV柔性直流电网快速恢复技术研究"~~
关键词
柔性直流
模块化多电平换流器
桥臂阻尼
故障恢复
flexible high voltage direct current（HVDC）
modular multilevel converter
arm damping
fault recovery
