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A new topology of a hybrid distributed generator based on photovoltaic and wind-driven permanent magnet synchronous generator is proposed. In this generator, the sources are together connected to the grid with the help of only a single boost converter followed by an inverter. Thus, compared to earlier schemes, the proposed scheme has fewer power converters. Model of the proposed scheme in d-q axes reference frame is developed. Two low cost controllers are also proposed for the new hybrid scheme to separately trigger the DC-DC converter and the inverter for tracking the maximum power from both the sources. The integrated operations of both the proposed controllers for different conditions are demonstrated through simulation and experimentation. Steady-state performance of the system and transient response of the controllers are also presented to demonstrate the successful operation of the new hybrid system. Comparison of experimental and simulation results are given to validate the simulation model.

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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.

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