Control System Design for Quasi Z-source Inverter as an Interface Converter for Manageable Distributed Generation Sources

Abstract

In this paper, the quasi Z-source inverter is used as an interface converter for distributed generation sources (DG). To obtain a dynamic model of the system, a small-signal linear model of a system around a specific operating point will be used. To obtain the describing equations of the system, the medium matrix is used in the inverter. After dynamic modeling of inverter system, the obtained model is used for the design of the DC controller and impedance grid. In this paper, controller suitable for distributed generation sources with controllable production is designed. For the proper functioning of the Z-source quasi inverter as an interface converter for distributed generation sources, it is necessary that in addition to the impedance grid controller, the AC inverter controller will be also designed. To this end, the appropriate current and voltage controllers on the AC current are introduced. To evaluate the performance of quasi Z-source inverter controller, the simulation in MATLAB / Simulink is used.