Abstract
Traditional static var compensators (SVCs) employ shunt reactors and capacitors. These standard reactive power shunt elements are controlled to produce rapid and variable reactive power. Power electronic devices like the thyristor etc. are used to switch them in or out of the network to which they are connected in response to system conditions. There are two basic types, namely the thyristor-controlled reactor (TCR), and the thyristor-switched capacitor (TSC). In this paper we wish to investigate a compensator where the reactor or capacitor is replaced by a series connected resistor and reactor (R-L). The performance equations are derived and applied to produce the compensator characteristics for each of the configurations. Their performances are compared, and the contrasts between them displayed. All three configurations are made to achieve unity power factor in a system.
Highlights
The I 2 R loss of this system is equal to 793 W, where the line resistance R=1.2 Ω
The I 2 R loss after compensation is equal to 141W, which is 82.2% reduction in power loss
The equations governing the performances of the thyristor-controlled reactor (TCR), thyristor-switched capacitor (TSC), and TSRL compensators were derived and used to illustrate how the reactive power drawn from the ac supply, by an inductive load, can be controlled in order to improve transmission and distribution lines performance
Summary
QS – Resultant reactive power flowing on the transmission line after compensation. It is given as: qS = qL + qcom (12). Where , icom is the current through the compensator and vc is the voltage across the capacitor. For the negative half-cycle of the supply voltage, i.e., when t = ( + ), icom = 0 again, and qcom qL qS t Fig. 13 Plots of reactive powers of the system
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