Optimized Isolated Operation of a WECS-Powered Microgrid with a Battery-Assisted qZSI

Abstract

This paper presents a battery-assisted quasi-Z source inverter (qZSI) powered by a wind energy conversion system (WECS) with a self-excited induction generator (SEIG). The proposed control algorithm ensures stable supply of the AC load and battery charging in isolated operation. The batteries store excess power so that no wind energy is wasted and also compensate for the WECS power shortage. In addition, fuzzy logic-based optimization algorithms are implemented to capture the maximum available power from both the wind turbine and SEIG at all operating conditions. Their operation, as well as the operation of the battery current controller (BCC), which takes into account the batteries’ state of charge (SOC), is coordinated by the master control algorithm to achieve optimal system operation. The performance of the proposed system has been tested through simulations in the MATLAB Simulink over wide ranges of wind speeds and SOC levels.

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.

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.