Designing of a Solar Energy based Single Phase Dynamic Voltage Restorer using Fuzzy Logic Controlled Novel Boost Inverter

In this work, an energy-efficient and reliable model of photovoltaic based single phase Dynamic Voltage Restorer (DVR) is proposed in order to mitigate severe voltage sags, swells, and interruptions affecting the sensitive equipment connected in low voltage distribution side. In case of short or long duration interruption, it can fulfil the load power requirement acting as a UPS. Fuzzy logic controlled novel boost inverter improves overall efficiency and dynamic performance of the DVR system. Further, it is also designed to solve the voltage quality problem of distribution system with the minimum usage of energy from the utility grid and in the most efficient way by making optimal usage of solar energy. The proposed DVR system model involves two PV systems with low power DC to DC converter, chargeable batteries, switches, fuzzy logic controlled SPWM based boost inverter implemented by two DC to DC boost converters and one injection transformer for each phase under sag/swell. The results obtained after simulation verifies the effectiveness of the proposed model of DVR in recovering the voltage sag/swell and interruption on the low voltage side of the distribution. The DVR model proposed is found capable of recovering voltage sag up to 0.1 p.u. and swell up to 1.9 p.u. of pre-sag voltage.