Analysis of a Droop-Based Power Controller for Three-Phase Microgrids

A droop-based controller for three-phase converters is described herein. It allows independent control of the converter power at each phase and smooth transitions to the islanded operation. Both three-phase four-wire and three-phase three-wire connections are considered, with a particular focus on the latter configuration. The islanded condition is detected automatically, without the need of communication with other units, and the transition toward the islanded operation mode is performed without interruptions of supply for the energized loads and resources. The considered application scenario is the one of smart microgrids, where power control flexibility and islanded capabilities are features of paramount importance to provide demand-response and uninterrupted operation. A systematic analysis of the approach is presented and validated herein.