Research of a novel PWM static VAR compensator based on AC_Buck voltage converter

This paper proposals a novel hybrid static var compensator, which can adjust capacitor continuously. The proposed compensator combines the PWM type AC_Buck converter with the transformer to adjust the voltage on the compensating capacitor directly. So the continuous output of reactive power is realized. The compensator has fast dynamic response, and produces no harmonic. The capacity of the transformer is only 25% of that of the compensating capacitor. Operation Principle of the compensator is elaborated in this paper, and the equations for the power of compensator and inverter are deduced. Experiment results verify the feasibility and effectiveness of the compensator.