Fuzzy Control Design for Quasi-Z-Source Three Phase Inverter

Abstract

Inverters are used widely nowadays because of the increasing availability of many of renewable energy sources. Not only energy sources like solar panels but also storage banks like batteries provide DC voltage. Traditional DC-AC inverters have main limitation; its output voltage value is limited to DC-rail voltage and cannot exceed it. To overcome this limitation and to avoid the usage of transformer for boosting; in this paper brief Z-source network technique in inverters is explained. This technique can work buck/boost and inverting in one stage without need to boost DC, invert DC and finally boost AC with transformer. Quasi-Z-Source network was developed, to operate better technique than Z-Source inverter by reducing component rating, quantity and voltage stress and simplifying control strategies. Fuzzy Logic control is used as a controller for the inverter. This paper uses Mamdani method with 3 VDC, IDC and Vc1 input and 2 outputs M and Do. The designed inverter in this paper could keep the output voltage 208v AC rms 60 Hz with wide range of variable DC input (200-400) v DC.