一种具有多个功率调节端口的新型Delta型无变压器统一潮流控制器

As the most comprehensive flexible ac transmission system device, the unified power flow controller (UPFC) plays a vital role in the transmission network. The conventional UPFC with a structure of two back-to-back voltage-source converters achieves isolation, and the voltage level increases through complex zig-zag transformers. However, expensive and bulky transformers add to the overall size and ...