Controlling variable load stand-alone hydrogenerators

The paper aims to establish a common way in controlling the electric energy quality in micro hydro plants. The considered situation deals with the stand alone synchronous and induction generators. The research investigates a power control scheme that would allow avoiding the mechanical control of the turbine. For the control study, simulations were made for variable loads. The considered control circuit performs the voltage and frequency regulation, separately and together, for both types of generators.