Supervisory Power Quality Control Scheme for a Grid-Off Microgrid

Abstract

Presently, microgrids based on renewable energy sources require proper control functions to meet the power quality requirement in the distribution system. In order to maintain the power generation/consumption balance and stable functioning, such as voltage and frequency of microgrid, the power systems traditionally utilize necessary control actions. However, the present practice requires the independent power producers and/or developers who want to build a microgrid for a stable operation in both grid-off modes and grid-tie modes. Therefore, this paper proposes an innovative supervisory power quality control scheme of a grid-off microgrid, especially voltage and frequency control objectives, at a given location. In doing so, the active and reactive powers are manipulated from the power conversion systems with taking into account their operating states and limits