摘要
以南澳±160kV中压柔性直流系统为例,配合直流断路器的应用,利用PSCAD/EMTDC仿真软件分析了极间短路故障时系统的暂态特性。首先介绍了南澳直流工程的系统拓扑和主回路参数,然后结合不同保护策略分析了系统对直流断路器的参数要求,提出了系统与断路器配合时直流限流电抗的调整思路。最后研究了线路长度、故障位置和断路器动作对暂态特性的影响。仿真结果表明,直流断路器可以快速开断故障电流,限制电流峰值,通过调整直流限流电抗可以实现系统与断路器的配合。研究结果对柔性直流输电系统参数设置和器件及设备选型有一定参考价值。
Based on Nan＇ao ± 160 kV medium-voltage MMC DC system, the interpoles fault transient charecteristics of the system areanalyzed in PSCAD/EMTDC with the application of DC current breaker. Firstly, the topology and parameters of Nan＇Ao system areintroduced. Then the parameter requirements on the breaker are discussed under different protection stragtegies. And next feasible strat-egies and methods of protection coordination by changing the reactance value are proposed. Finally the influence of line length, faultlocation and breaker operation on transient charactristics is analyzed. The results show that DC current breaker will limit the peak offault current immediately, and the protection coordination could be achieved by adjusting the DC current limiting reactor. The resultswill be a valuable reference for MMC DC transmission system parameters settings and equipment selection.
出处
《南方电网技术》
北大核心
2015年第9期44-51,共8页
Southern Power System Technology
基金
国家863高技术研究发展计划(2013AA050103)~~
关键词
柔性直流输电系统
直流断路器
极间故障
电磁暂态过程
仿真分析
MMC DC transmission system
DC current breaker
interpoles fault
electromagnetic transient process
simulation analysis
