Control and Modification of Two Vector αβ for 48-Pulse DVR to Reduce Total Harmonic Distortion With Using Active Filter
Abstract
In this paper the proposed dynamic voltage restorer (DVR) can compensate the voltage unbalanced and mitigate total harmonic distortion(THD) by using active power filter (APF) during the sag condition. The suggested control algorithm employs the two vector αβ control with phase locked loop (PLL), synchronous reference frame(dq) and stationary reference frame (αβ) to improve the DVR performances. It extracts the fundamental components of the measured voltage and current using a 48-switch inverter connected in parallel to improve the time response and pulses. The proposed control method is tested on an 11 kV distribution system. Simulation results are obtained using PSCAD/EMITD to verify the effectiveness of the proposed control algorithm. The proposed controller with active filter can reduce the total harmonic distortion from 5% to 0.01% within 1.5 ms response for sudden sag.
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