Active power decoupling and controlling for single-phase FACTS device

The Journal of Engineering

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[1] Collage of Computer Science, South-Central University For Nationalities, Wuhan, People's Republic of China;Collage of Electrical Engineering, Wuhan University, Wuhan, People's Republic of China;

关键词: electrolytic capacitors;    invertors;    electric current control;    voltage control;    power grids;    power capacitors;    flexible AC transmission systems;    digital control;    single-phase FACTS device;    bulky life electrolytic capacitor;    short-life electrolytic capacitor;    single-phase H-bridge;    active power decoupling;    line frequency;    power density;    three-phase H bridge structure;    grid current control;    digital quasiPR controller;    cosine controller;    two-ripple harmonic;    2-ripple energy;    AC capacitor voltage control;   

DOI  :  10.1049/joe.2018.8823

来源: publisher

【 摘 要 】

Single-phase FACTS device has a bulky and short-life electrolytic capacitor to absorb the ripple pulsating at twice of the line frequency in DC side, resulting in lower power density. This paper introduced a structure of three-phase bridge which added an additional leg connected to an AC capacitor based on single-phase H-bridge. The 2-ripple energy of the electrolytic capacitor in single-phase H-bridge could be transformed to the film capacitor of the AC side in three-phase H bridge. The size of single-phase FACTS is reduced by ten times compared to the single-phase H-bridge. A simple control strategy had been studied, through two kinds of controllers: the digital quais-PR controller had been used to control gird current and AC capacitor voltage and current; the two cosine controller had been used to eliminate the rest of two-ripple harmonic in the DC side, there was no controller to maintain DC voltage. The experiments verified the feasibility of the control strategy.

【 授权许可】

CC BY