ABSTRACT
A satisfactory operation of an AC power system is achieved when frequency and voltage remain nearly constant or vary in a limited and controlled manner when active and reactive loads vary.
Active power flow is related to prime mover’s energy input and thus to the speed of speed governors (SGs). On the other hand, reactive power control is related to terminal voltage. Too a large electric active power load would lead to speed collapse, while too a large reactive power load would cause voltage collapse.
