Comparison of Control Strategies of Quasi Z-Source Inverter for Wind Power Generation

Abstract

This paper compares the control strategies of Quasi z source inverter for wind power generation. The generator in the conventional wind energy conversion system uses kinetic energy from the wind to produce electrical energy. Owing to wind fluctuations, the generator's output is connected to the load via a rectifier and inverter to keep the voltage at the load side constant. The 2-stage conversion phenomenon has its limitation of being expensive along with possessing lower efficiency. Z source inverters offer a novel conversion approach and can utilized to alleviate the limitations. However, they come with certain downsides as well, such as unequal input current, high inrush current, and high voltage stress. The quasi-Z source inverter (QZSI), a single-stage power converter based on the Z source inverter topology, can overcome it. It performs this by using an impedance network that couples with the source and the inverter to provide a voltage boost for the wind power generating system. In this paper, a comparative study of different control strategies of quasi-z source inverter is performed for a wind power system to find out one efficient strategy.