Voltage dip ride-through capability of converter-connected generators

Abstract

Voltage dips have been proven to be one of themost important aspects of power quality. In order to avoid ma-jor economical damage, grid-connected equipment should be de-signed with a good voltage dip immunity. This holds as well forconverter-connected loads as for converter-connected distributedgeneration (DG) units. This paper presents a control strategy forgrid-connected DG converters yielding an improved voltage dipride-through capability. Due to the implementation of the pro-posed control strategy, shutdown of DG units due to voltage dipsis avoided, resulting in a stronger utility grid. Experimental testson a single-phase full-bridge bidirectional converter are carriedout and validate the aforementioned postulations.