Application of Fuzzy Controller for Two-Leg Inverter Solar PV Grid Connected Systems with High Voltage Gain Boost Converter
CH Hussaian Basha, C. Rani
Abstract
At present, the three-phase Voltage Source Inverters (VSI's) are playing a major role in Photovoltaic (PV) grid-connected systems. The drawbacks of conventional VSI's are high implementation complexity, high power loss and less reliable. In order to overcome the drawbacks of conventional VSI's, in this article, a fuzzy logic PWM controller-based two-leg three phase Voltage Source Inverter (VSI) is proposed to extract the maximum power of solar PV and to maintain constant grid voltage and frequency as it is having wide input and output operation and multiple fast controlling actions. The Low Pass Filter (LPF) based small-signal model slider Pulse Width Modulation (PWM) controller is used in Inductor Coupled Boost Converter (ICBC) to improve system dynamic response, voltage gain and infinite switching at different solar irradiation conditions. An adaptive Maximum Power Point Tracking (MPPT) technique is used to track the fast change of solar irradiations. The voltage at the DC-link capacitor and grid voltage are analyzed at different irradiation conditions.