3ph qZSI Controller Design using PI for DC side and PR for AC side Controller including Droop Characteristic in standalone mode

Abstract

This paper presents the closed loop controller design of a quasi-z-source inverter (qZSI). The qZSI is used as a single-stage power converter and can operate in buck and boost mode operation. Hence qZSI is an economical solution for distributed generation and eliminates the need for two-stage power conversion. To obtain the quality output ac supply, the closed multi-loop control method is proposed in this paper. In proposed control method, the controls of the dc and ac sides are done separately. The proportional and resonant controllers are used in the ac side, whereas proportional and integral controllers are used in the dc side. Furthermore, to mimic the behavior of the synchronous generator, the droop control is used to generate the reference voltage for ac side of the controller. The MATLAB/Simulink models are used for testing and analysis purpose.