Control of Standalone Wind/PV Hybrid Renewable Power Generation

Renewable energy sources such as solar and wind are ubiquitous and environmental friendly. The Hybrid PV/Wind power system is the best renewable energy sources due to their complementary nature. This paper proposes effective control of PV/Wind hybrid generation scheme using solar and wind energy for the stand alone applications. The system consists of PV/Wind hybrid system, Cuk Sepic dc-dc converter, a three phase dc to ac converter, controller and ac load. The dc voltage magnitude of the PV array is boosted to a higher value by using Cuk-SEPIC converter before converting ac voltage. This Cuk-SEPIC converter can supply the load depending on the source of power available i.e from wind or PV or both of them. As solar power is intermittent in nature, so tracking the maximum power point (MPP) of a PV array is usually an essential part of a PV system. Specialized control algorithms have been developed called maximum power point tracking (MPPT) to constantly extract the maximum amount of power from the array under varying conditions. In this paper Perturb and Observe (P&O) method is used for maximum power point tracking. A three phase pulse width modulated inverter is used to convert dc to ac and to supply power to ac loads. A synthesized AC output voltage is produced by appropriately controlling the switches using PWM technique using average power control to control active and reactive power fed to the load. The average power control method provides high quality sinusoidal output current and controls the average power flow. The performance of the system is analyzed using MATLAB/SIMULINK.