变电站直流系统的容性无功优化设计及评价

Design and evaluation of capacitive reactive power optimization in substation DC system

针对变电站经常由于直流系统接地而导致保护装置误动作的问题,提出了直流系统容性无功的概念,并采用容性无功的优化设计方法设计了一种集中独立式直流系统供电优化方案。该方案降低了直流线路的对地容性,在满足供电可靠性的基础上,通过优化线路走径达到减少无功功率的目的,减少了保护装置的误动作问题,提升了直流系统的运行效率。最后对该方案的无功优化效果进行了评价,验证了其安全可靠性及经济性。

In view of problem of misoperation of protection device caused by DC system grounding fault which often appears in substations, the concept of capacitive reactive power of DC system was proposed, and an optimized scheme of centralized power supply of DC system was designed applying optimization method of capacitive reactive power. The optimization scheme reduces DC line-to-ground capacitive character, and achieves the purpose of reducing reactive power by optimizing circuit trail on the basis of meeting supply reliability. It solves the misoperation problem of protection device and improves operating efficiency of DC system. Finally, the effect of the reactive power optimization scheme was evaluated to verify its reliability, security and economical efficiency.