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control of Active Power and Reactive Power
So far this book has concentrated on the characteristics and modelling of individual elements of the power systems. This chapter will examine control of active power and reactive power by considering the system as an entity. In addition, the characteristics and modelling of equipment used for control will be described.
The flows of active power and reactive power in a transmission network are fairly independent of each other and are influenced by different control actions (see Section 6.3). Hence, they may be studied separately for a large class of problems. Active power control is closely related to frequency control, and reactive power control is closely related to voltage control. As constancy of frequency and voltage are important factors in determining the quality of power supply, the control of active power and reactive power is vital to the satisfactory performance of power systems.
11 . I ACTIVE POVVER AND FREQUENCY CONTROL
For satisfactory operation of a power system, the frequency should remain nearly constant. Relatively close control of frequency ensures constancy of speed of induction and synchronous motors. Constancy of speed of motor drives is particularly important for satisfactory performance of generating units as they are highly dependent on the performance of all the auxiliary drives associated with the fuel, the feed-water and the combustion air supply systems. In a network, considerable drop in frequency could result in high magnetizing currents in induction motors and transformers. The extensive use of electric clocks and the use of frequency for other timing purposes require accurate maintenance of synchronous time which is
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