Analysis and Design of the Green Voltage Regulator Based on Transformer Coupling

Aiming at high harmonic content and low power factor of AC voltage regulator, a kind of high power factor voltage regulation is proposed. By means of transformer coupling, the green voltage regulator has the advantages of high commonality and low voltage quota of thyristors. Based on the analyses of harmonic content and power factor, high power factor AC voltage regulation which adopts two single phase voltage regulations to work together can minimize harmonic content and improve energy efficient. Owing to the existence of leakage inductance of transformer in electric circuit, the current lags behind voltage. There will be circular current effect when it changes voltage phase. So the article analyzes the reason of circular current. Finally the application can satisfy Chinese National Standards of power quality and harmonic of public utility grid by analyzing the circuit based on impedance load.