Advanced Study on Performance Analysis of Three- Phase DVR with Modified Switching Band Controller

This paper deals with the mitigation of voltage related PQ issues by using three phase neutral
clamped VSI topology is used to realize the DVR and the design of DVR for the selection of suitable
interface inductor, DC capacitor storage series resistance and the capacitance. The quality and
reliable power are essential for sustainable development of any country. Here three-phase four wire
DVR with modified switching band controller topology is proposed, which overcome the frequent band
violation, poor controllability and heavy filter currents and compared to three-phase four wire DVR
with conventional filter topology. The compensation capability of the proposed topology is analyzed
based on simulation studies and corresponding results are compared with different switching control
strategies. The consequent merits and demerits switching loss in VSI, ripple in compensated load
voltages and error between reference injected voltages and actual injected voltages in different
switching control strategies are discussed. It is observed from the analysis, from SRF theory generate
the accurate reference injected voltages and PLL provides particular rotational speed.