A unified power electronic controller for wind driven grid connected wound rotor induction generator using line commutated inverter

Abstract

The implementation of a simple power converter for a wound rotor induction generator employing a three phase diode bridge rectifier and a line commutated inverter in the rotor circuit for super synchronous speeds has been proposed. The detailed working of the system in power smoothing mode and maximum power point tracking mode is presented. The current flow in the rotor circuit is controlled (by controlling the firing angle of the line commutated inverter) for controlling the stator power in both the modes. An 8 bit PIC microcontroller has been programmed to vary the firing angle of the line commutated inverter. Experiments have been carried out on a 3-phase, 3.73 kW, 400 V, 50 Hz, 4-pole, 1500 r/min wound rotor induction generator and the results obtained with the generator supplying power in both the modes are furnished. The complete scheme has been modeled using MATLAB/SIMULINK blocks and a simulation study has been conducted. The experimental waveforms are compared with the simulation results and a very close agreement between them is observed.

Keywords

line commutated inverter / MPPT / power smoothing / wound rotor induction generator

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Acknowledgements

The authors wish to thank the authorities of National Institute of Technology, Tiruchirappalli for providing the facilities to carry out the experimentation. The authors also wish to thank Mr. Venkatesh of this department for his assistantship in the fabrication of the inductor required for the dc link and power circuit.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg