超高压电网串联谐振型短路电流限制器关键技术

Research on Key Technologies of Series Resonant Type Fault Current Limiters for EHV Grid

串联谐振型短路电流限制器是目前解决超高压电网短路电流水平超标的一种有效手段,电容器组旁路装置的性能与限流深度是串联谐振型短路电流限制器研究中的2个关键技术问题。结合前人的工作,针对这2个技术问题进行了研究,提出了新型串联电容器组旁路装置以及可变阻抗电抗器,可以有效提高超高压电网串联谐振型短路电流限制器的限流效果。对超高压电网短路电流限制器的研究现状进行综述,对串联谐振型限流器的2个关键技术问题——电容器组旁路装置与限流深度进行了分析,介绍了新型串联电容器组旁路装置的原理、结构并对其性能进行了分析。新型旁路装置在可靠性、动作速度、通流能力以及经济性方面都有很高的性能。介绍了可变阻抗限流电抗器的原理、结构并进行了验证性试验,经试验验证阻抗可提高100倍以上。

The series resonant type fault current limiter is an effective mean to solve the excessive level of fault current of EHV grid, and the performance of capacitor bank by-pass device and the limiting depth are the key technologies that need to be studied for series resonant type fault current limiter. In this paper, combined with previous work, a study is made on the two technologies, and a new type of series capacitor bank bypass device and a variable impedance limiting reactor are proposed, which can effectively improve the limiting effects of series resonant type fault current limiter for EHV grid. Besides, the research status of fault current limiter for EHV grid is also reviewed, and the two technologies of series capacitor bank by-pass device and limiting depth are analyzed. An analysis of the principle, structure and performance of the new-type series capacitor bank bypass device shows that the new-type series bypass device has high performance in reliability, action speed, ampacity and economy. Finally, based on the principle and structure of variable impedance limiting reactor, a verification experiment is conducted, which shows that the impedance can increase by more than 100 times.