Analysis and Research of Control Strategy and Signal Detection Based on UPQC

In this paper, the main circuit structure with series dynamic voltage restorer (DVR) and shunt active power filter (APF) of unified power quality conditioner (UPQC) is taken as the research object. According to its fundament component of steady-state equivalent circuit the phasor representation in voltage changing is shown. The optimum angle voltage injection of DVR is proposed by the principle of main circuit minimum total capacity. The output compensation voltage of UPQC is given according to optimum angle voltage injection on minimum total capacity. The initial phase of fundament component of source phase voltage and phase angle jump are based on the instantaneous reactive power and soft phase locked loop (SPLL) theory. The harmonic current is compensated by using self-adaptive fuzzy control technology which can improve harmonic current detection method on the shunt inverter. The experiment results are provided in order to verify the rationality of this control strategy.