Design and Control of Grid Connected PV/Wind Hybrid System Using 3 Level VSC

Abstract

The demand for the electricity was gradually increasing during the past years causing imbalance in the existing utility power grid which leads to several problems like load shedding and unbalanced voltage which ultimately affect the end consumers. In order to overcome this situation the usage of non conventional energy sources have become research hotspot during the past decade. In his context autonomous PV and wind integrated hybrid systems have been found economically viable alternative to supply energy continuously to the numerous deficit customers. Individual configuration of solar or wind power leads to fluctuations in system. When combined together will provide a reliable and sustainable source with constant flow energy. PV and Wind energy systems are combined at the DC bus and its voltage is magnified to required level by using DC-DC Step-Up converter. This paper deals with common grid perturbations like balanced voltage dips, unbalances voltages and harmonic distortions. The generated output power from the PV/wind system is fed to all connected loads. Under surplus power condition excess power is fed to the utility grid. This paper presents integrated hybrid system model in MATLAB/ SIMULINK environment.