Study on the Fuzzy Control Strategy Based on Back-to-Back Micro Grid Connection

This paper proposes a method of microgrid paralleling with large grid based on back to back VSC. In double-loop control of back to back VSC, the outer loop control strategy is fuzzy control strategy , the outer loop control references can be established by using the ratio between frequency differences and active power transmission and the ratio of reactive power transmission between voltage differences, then control parameters can be regulated automatically. The results of PSCAD/EMTDC simulation show the effectiveness of the method and that fuzzy control can increase dynamic response and stability of grid paralleling.