申論題

6.(20%) A single area consists of two generating units, rated at 500 and 800 MVA, with speed regulation of 6 percent and 5 percent on their respective ratings. The units are operating in parallel, sharing 900 MW. Unit 1 supplies 300 MW and unit 2 supplies 600 MW at 1.0 per unit (60 Hz) frequency. The load is increased by 100 MW.

(c) Explain the operating principles of Frequency Control and Voltage Control in power system. (5%)