摘要
柔性直流输电系统中,采用模块化多电平换流器(MMC),与传统直流输电技术相比较优势在于:无需无功补偿、没有换相失败、谐波水平低,能同时独立调节有功功率和无功功率。但是在直流侧发生故障时,由于目前还没有大容量高电压高速直流断路器,清除故障的手段是跳开换流站交流侧开关,使故障清除和直流系统再恢复的时间比较长,影响柔性直流输电的可用率。针对上述问题,通过全桥子模块、钳位双子模块、交叉型子模块的MMC故障自清除技术,缩短直流输电再恢复的时间,尽可能保证直流电网的稳定运行。
The MMC is applied in a flexible DC power transmission system. Compared with traditional HVDC, it has the advantage of no reactive compensation, no commutation failure and lower harmonic waves, and it can regulate the active power and reactive power independently, and it helps to construct the Muti-Terminal DC System. However, with no high voltage, high capacity, and high-speed DC Circuit Breaker at present, it is usual to solve this kind of technical problem by tripping out switch on AC side of converter station when the DC Side goes wrong. As a result, the recovery is too long and affects on the availability. Aiming at these problems, MMC applied is beneficial to reduce the recovery time and keep the DC Power supply under stable operation which includes full-bridge submodule, clamp double sub-module, Cross sub modules.
作者
殷培峰
宋博仕
YIN Pei-feng;SONG Bo-shi(Electric & Electronic Engineering School,Lanzhou Petrochemical Polytechnic,Lanzhou 730060,China)
出处
《兰州石化职业技术学院学报》
2019年第2期7-10,共4页
Journal of Lanzhou Petrochemical Polytechnic
