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Nigerian Journal of Technology

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Modeling and Analysis of a Three-Phase Solid-State Var Compensator (SSVC)

AJ Onah, MU Agu

Abstract


The problems associated with the flow of reactive power in transmission and distribution lines are well known. Several methods of var compensation have been applied in solving these problems. This paper examines the performance of a three-phase solid-state var compensator employed in the power system for reactive power compensation. The principal component of this device is a three-phase pulse-width-modulated voltage source inverter. A mathematical model of the inverter is derived and then used for the transient analysis. Optimization of the ac input power factor can be achieved by adjusting the angle difference between the inverter fundamental output voltage and the utility supply voltage. The open-loop frequency responses obtained show a very stable, high speed performance in the frequency range of interest.




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