面向城市电网扩容改造的双端型柔性分频输电系统M³C 换流站建模与控制研究

The point-to-point fractional frequency transmission system (FFTS_, with frequency converters equipped on both ends of lines, can boost the transmission capacity of lines and reducing the grid frequency fluctuations due to power flow change, and is an effective solution to capacity insufficiency of the urban power grid. This paper conducts research on modeling and control of the M³C (modular multilevel matrix converter_ station dedicated for point-to-point FFTS application. The mathematical model under double αβ0 frame is established first. Then, the overall framework of M³C station control system and corresponding control strategy for each part as well as coordination strategy between the sending and receiving frequency converter stations. The Validness and effectiveness of the proposed strategy are verified by simulation examples.