SUMMARYHybrid autonomous power plants based on wind-driven induction generators excited by a photovoltaic (PV) array has been recently found to be a reliable power source for remote locations. In such schemes, a composite controller for both maximum power point tracking and voltage control has not been attempted so far. Hence a dc-dc converter with a dual control strategy of peak power tracking when the battery is connected and in voltage control mode in the absence of the battery is proposed in this paper. The development of such a controller is also presented. A d-q axes model of the proposed scheme is given and the results of the simulation of the entire scheme are also presented. The battery charging and discharging regimes have been distinctly identified for variations in irradiations and shaft-torque conditions. Close proximity between the calculated peak power for different irradiations and the peak power observed from the simulated results brings out the significance of the proposed controller.
Grid connected PV systems is gaining popular in the recent past as a viable and attractive alternative source of power in the urban areas to meet the increasing energy demand. This paper presents a comprehensive review of Maximum Power Point Tracking (MPPT) techniques employed in such grid tied PV systems. A classification of different MPPT techniq ues based on topology of grid interface is presented. Also the simulation and detailed performance analysis of the incremental conductance (INC) method with () (delta) control has been presented. In this work a single stage grid tied PV system has been considered due to its advantages, for the performance analysis of the INC technique. Simulation of this single stage Grid tied PV Inverter is done using MA TLABI Simulink. Different cases have been considered for simulation and performance indices measurement, under varying irradiation and temperature conditions. Also the MPPT control under varying grid voltages has also been analyzed. The Simulation results have been presented in detail and the results depicts that () control modified Incremental conductance MPPT works for different values of irradiations, temperature and grid parameters variation and are presented in this work.
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