Optimal Control of a Standalone Wind-Solar Battery Power System with a Quasi-Z-Source Inverter

Abstract

This paper presents a battery-assisted quasi- Zsource inverter (qZSI) powered by a wind-solar hybrid generation system for autonomous load supply. The considered wind energy conversion system (WECS) utilizes a self-excited induction generator (SEIG) for electricity generation. Maximum power point tracking algorithms (MPPTs) are implemented to capture the maximum available power from both the WECS and the photovoltaic (PV) system. The batteries compensate for the oscillations in the available wind and solar power so as to ensure continuous operation of the system. In addition, the utilized qZSI, being a single- stage inverter with buck/boost capability, eliminates the requirement for an additional transformer or dc-dc boost converter. Such a hybrid generation system is for the first time proposed here. Its performance has been experimentally validated over a wide range of operating conditions by using a 5 kW experimental setup. The control algorithm was executed in real time by means of the DS1103 and MicroLabBox controller boards (dSpace).

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.

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.

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.