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Performance Analysis of Grid Integrated Doubly Fed Induction Generator for Small Hydropower Plant

The motive of this work is to present the modeling and simulation of the hydraulic turbine which is driven by the doubly-fed induction generator and the generated ac power given to the grid. For feeding the ac power to the grid, we are using two PWM voltage source converters which are connected back to back between the utility grid and rotor terminals with the help of common dc-link. Machine side converter is used for pertinent excitation. The power flow between AC side and DC bus is controlled by grid side converter (GSC) as well as it allows the system to be operated in less than and greater than synchronous speed mode of operation. MATLAB/SIMULINK is used for Time domain simulations. The system is stable under different load conditions and it is investigated with the help of model and simulations result. To preserve the system stability whenever the power demand is precipitously increasing in the utility grid side, an appropriate system and controller parameter is used.