Compensador série de tensão em onda quadrada para mitigação de afundamentos de tensão

Abstract

Series Voltage Compensators (SVC) are used to mitigate power quality problems related to voltage distortion issues. The most known SVC are the DVR ™ (Dynamic Voltage Restorer) and DySC ™ (Dynamic Sag Corrector), which are used to protect sensitive loads. The voltage injected by the DVR is sinusoidal, produced by an H-bridge inverter which is modulated using Pulse Width Modulation (PWM) and a sinusoidal output filter. Considering that voltage sags are fast phenomena that usually last hundreds of milliseconds, this paper proposes the use of square-wave voltages to compensate sags as well as the control strategy for the compensator. Experimental results show the effectiveness of the injection of a square-wave voltage for the protection of electronic loads.