Karnail Singh, Ashwani Kumar
In a power system due to continuous change in rising and falling trends both active and reactive power demands changes. for this water input to hydro generator and steam input to turbo generator continuously changed to cover the active power demand. If it is not done machine speed will change with change in frequency. Also change in excitation must be done to match reactive demand in modern power system manual regulation is not possible and therefore automatic generation and voltage regulation equipment is installed on each generator. Various controllers ae designed for different operating condition and they take care of small changes in load demand. The active power P is mainly dependent on the internal angle δ and is independent of the bus voltage magnitude. The hydro area is considered with either mechanical or electric governor and thermal area is considered with either single or double reheat turbine. Hydro thermal system with controlled mode of operation is explored with constant load condition. Here electric governor and mechanical governor are used with and with out rate constraints like single stage reheat turbine and two state reheat turbine on dynamic response have studied. Response is examined considering 1% step load perturbation in either thermal or hydro area.
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