Questions -
1. The annual load duration curve of a power system decreases uniformly from a peak power of 50MW to zero over a period of one year. The power system is supplied by two stations: A (peak load station) and B (base load station) having the following annual cost models:
Station A: Rs (75060 + 80 x kW + 0.02 x kWh)
Station B: Rs (50000 + 50 x kW + 0.03 x kWh)
Determine the installed capacity for each station and for how many hours per year peak load station should be operated to give the minimum east per unit generated.
2. Determine the effect of 2% increase in load over the voltage and frequency of the system having a power factor of 0.85 lagging. A generating system has a machine constant of 0.5MW/s and is supplying a load of 1500MW. Find the rate at which frequency will change due to sudden load rejection of 10%.
3. In automatic generation control, determine the effect of 2% increase in load over the voltage and frequency of the system having a power factor of 0.8 lagging.