摘要
模块化多电平换流器直流输电系统(Modular Multilevel Converter HVDC,MMC-HVDC)的阀侧交流母线与换流器直接相连,其故障对换流阀造成的危害相对于网侧交流母线故障要严重的多。对其控制保护策略进行深入的研究分析有助于提高MMC-HVDC系统电力传输的安全性和可靠性。首先对MMC基本结构及原理进行了介绍。然后对阀侧交流母线故障进行了分类,就单相接地故障对系统的影响进行了深入的研究分析,并提出了针对性的控制保护策略。最后通过对阀侧交流母线单相接地故障进行仿真,验证了故障特性分析的正确性和对应保护策略的可行性。
The internal AC bus of MMC-HVDC system is directly connected to the converter. Faults on the internal AC bus will lead to more serious harms to the system than those on the AC grid side. To enhance the security and reliability of the DC transmission, it is necessary to analyze the internal AC bus faults in more detail to find out reasonable protection strategies. Firstly the structure and principle of MMC are discussed. Then, the internal bus faults are reviewed, and a protection strategy focusing on single-phase ground fault are proposed. Finally simulation by RTDS is carried out. Results of the simulation show that the proposed protection strategy is valid and effective.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2014年第19期150-154,共5页
Power System Protection and Control
