Sensorless control strategy for grid connected PV array and wind-driven induction generators

A control strategy for hybrid dispersed power generators based on Photo-voltaic array and wind driven induction generator integrated with residential load and grid is investigated in this paper. The state space model developed for this grid integrated hybrid scheme is used for the design of controller topology involving nested power, voltage and current loop and implemented in MATLABSimpower platform. The operation of the scheme is investigated for varying power demands from the customer side and for varying irradiations of PV array with constant wind speed by independent control of real and reactive power. The inverter terminal voltage and PV array voltages are calculated on the basis of parameter estimation and thus voltage sensors can be avoided. The simulation results clearly indicates that the developed controller is able to maintain constant voltage at Point of common coupling (PCC) and deliver current at UPF with good dynamic response for varying irradiations and also nullifies the effect of voltage swell and sag at PCC.