Bidirectional multilevel shunt compensator with simultaneous functionalities based on the conservative power theory for battery-based storages

Abstract

Renewable energy and storage technologies have a meaningful growth in the past decades. The use of multilevel topologies within these technologies is being preferable chosen because of the better features over the conventional full bridge inverters when the applications involve high power processing. Moreover, digital control algorithms make possible power electronics converters to be operated in different manners without changing their structure. This study presents a bidirectional multilevel shunt compensator (BMSC) able to perform different and simultaneous tasks. There are seven possible modes of operation that a decision taker may demand to the BMSC. The control strategy is based on the conservative power theory. The phase-locked loop, the proportional-integral tuning procedure and how the decision taker works are presented. The seven operation modes were experimentally verified and the BMSC efficacy is proved.