Voltage dip ride-through capability of converter-connected generators

Abstract

Voltage dips have been proven to be one of the most important aspects of power quality. In order to avoid major economical damage, grid-connected equipment should be designed with a good voltage dip immunity. This holds as well for converter-connected loads as for converter-connected distributed generation (DG) units. This paper presents a control strategy for grid-connected DG converters yielding an improved voltage dip ride-through capability. Due to the implementation of the proposed control strategy, shutdown of DG units due to voltage dips is avoided, resulting in a stronger utility grid. Experimental tests on a single-phase full-bridge bidirectional converter are carried out and validate the aforementioned postulations.