Dynamic Voltage Restorer with Battery Management Features for Power Quality Improvement in Distribution System

In this paper, a Dynamic Voltage Restorer (DVR) control algorithm with battery management features are presented for the protection of sensitive and censorious loads. A simple DVR control scheme based on dual P-Q theory has been presented to obtain the instantaneous reference DVR voltages to compensate the load voltages. The proposed control scheme embraces energy optimized compensation, which results in a reduction of DC energy storage requirement. A DVR battery management scheme, as a part of this control strategy, has been introduced for better battery energy utilization. Each leg of the three-phase three-leg split capacitor inverter is used to inject series DVR compensation voltages explicitly in each phase of the three phase distribution power system. The effectiveness of the proposed control algorithm has been validated by using computer simulation studies.