Stand-alone Operation of a Three-Phase Quasi-Z- Source Inverter with Load Voltage Control

Abstract

The paper examines the static and dynamic performance of a three-phase quasi-Z-type inverter system without grid connection with regulated output voltage. The control system is implemented with the MicroLabBox development computer system described in the paper. The basic operating principle of the quasi-Z-type inverter and the control system that achieves the desired effective value of the fundamental harmonic of the alternating voltage are described. For the purposes of experimental testing of the system, a corresponding laboratory model has been implemented. Tests have been conducted for different input voltage settings, duration of the shooting state and load resistance. The optimal range of the input DC voltage has been determined with regard to the utility and stability of the inverter operation and the accuracy of output voltage regulation.

Mateo Bašić

Full Professor | Department of Power Electronics and Control

Full professor at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in Split, with recent research interests related to the fields of power electronics and renewable energy sources, with a special focus on energy-efficient control of inverters, battery systems, wind turbines, photovoltaic sources and self-excited induction generators in microgrids - both in island operation and in grid-tie operation.

Ivan Grgić

Assistant Professor | Department of Power Electronics and Control

Assistant professor at the Faculty of Electrical Engineering, Mechanical Engineering and Architecture in Split, specialized in the research of power electronic converters in photovoltaic systems and microgrids. Currently, he teaches courses in the areas of control engineering, digital electronics, electrical engineering, electrical machines and transformers.

Dinko Vukadinović

Full Professor | Department of Power Electronics and Control

Full professor at the Faculty of Electrical Engineering, Mechanical Engineering, and Naval Architecture in Split, specialized in modern control systems for power electronic converters, electric motors, and generators. At the Power Electronics Research Laboratory, he leads experimental projects and develops advanced methods for regulating electrical machines and converters, while supervising doctoral research in these areas.