Open AccessActive power decoupling and controlling for single‐phase FACTS device
Author(s) -
Zhang Junmin,
Liu Kaipei,
Liu Yan,
He Shunfan,
Tian Wei
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.8823
Subject(s) - ripple , decoupling capacitor , electrolytic capacitor , capacitor , control theory (sociology) , decoupling (probability) , h bridge , controller (irrigation) , voltage , materials science , harmonic , computer science , electrical engineering , inverter , physics , engineering , acoustics , control (management) , agronomy , artificial intelligence , control engineering , biology
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.