Author

Abstract

This research presents a harmonic analysis of the power system with static VAR
compensator. The model is formed by parallel combination of Thyristor Control
Reactor (TCR) with a bank of capacitor .This model based on use of harmonic
switching functions and this harmonic model is completely general and can be
interpreted as a harmonic admittance equivalent. It is suitable for direct
incorporation into the harmonic domain frame of reference where it combines
easily with frequency dependent admittances of the transmission network, and
with other linearised component. This approach leads to efficient iterative solution
of power networks containing TCR. The general operating condition corresponds
to a case, when the switching instant of thyristor valve are function of network
nodal voltage conditions, this applies to both thyristor turn-on and turn-off
instants. In such situation the voltage zero crossing points calculated with good
accuracy at each iterative step, are used to update the TCR switching function.
Newton-Raphson technique is used to determine the zero-crossing points.

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