Effect of automatic generation controller of participating generators under frequency linked Indian tariff system

The frequency linked availability based tariff in Indian tariff system which encourages the redispatching of participating generating units in real line. According to availability based tariff the generating units are paid at higher rates for the unscheduled interchange they make to restore the frequency to nominal value of 50 Hz. Hence the generating units can earn more profit through unscheduled interchange. This paper compares the effect of primary and secondary controller in automatic generation control on dynamic change in generation and profit earned by generating units. A comparative study in terms of profit earning has been made between generating units with only primary controller or free governor mode and generating units with secondary or supplementary controller along with primary controller. This work also encourages the generating units to operate the units not only on free governor mode but also with supplementary controller which is still not commonly practiced in India.