Control of Autonomous Solar PV-Wind Hybrid System

Increasing need of clean energy have driven mankind towards renewable sources. PV and wind sources being readily available and pollution free are gaining popularity. Thus, control of Solar PV-Wind hybrid system is proposed for standalone three phase applications. Solar and Wind sources are integrated at DC link with battery backup. Inverter supplies the load. PV is associated with DC interface by means of boost converter performing MPPT or Desired Power Control (DPC) as required and boosting its output voltage. PMSG usedfor wind energy conversion is further integrated to DC link via rectifier and boost converter to perform Maximum power point Tracking (MPPT). The battery is connected through a bidirectional converter to maintain DC link at a specified level and enable energy displacement as per energy production and load. DPC algorithm allows extracting only desired amount of power form PV according to prevailing load requirements. It thus can also prevent deep discharging or overcharging of battery. This improves system efficiency and battery life. The inverter performance is enhanced by using synchronous reference frame transformation for its control which helps in regulation of AC output voltage, getting exact data about load's active power component and diminishing complexity of control. Its control is such that output voltage and frequency is maintained. PV Boost, bidirectional converter and inverter are operated in inner current control and outer voltage control mode. This provides better performance with accurate tracking of references. All analytical, simulation and partial hardware results are included.