This paper presents a study for the solution to the problem of stability of the steady state frequency of a generator connected to a load, by using a binary logic control. The active power flowing in the load, influences the machine generated voltage frequency. In the present study, an induction motor has been used as generator machine. To ensure that this frequency remains constant against variation of loads, a ballast load will be used, the power of which is controlled by using a binary logic.

A system designed to protect against generator under-voltage or overvoltage, through the use of an automatic hydraulic floodgate in a micro-hydro power plant, using induction generator in a stand-alone operation, was implemented in a micro-station hydroelectric power 30[kW]. The proposed system uses 24[V] batteries in a circuit and these are always kept ready using a battery charger, designed especially for the microstation operation. The time of descent and the gate rise time, are approximately one minute and a half. Tests were performed for the operation of the gate. The proposed protection system was robust, efficient, simple and reliable.

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