Review of Power Sharing Control Strategies for Islanding Operation of AC Microgrids

TLDR

Microgrids integrate renewable energy via distributed generators connected through power inverters, and for islanding operation they must proportionally share load and maintain voltage and frequency stability. This paper reviews and categorizes power‑sharing control principles for AC microgrid islanding. The authors graphically illustrate and compare various control schemes, highlighting their advantages and disadvantages. The review identifies future trends in power‑sharing control for AC microgrids.

Abstract

Microgrid is a new concept for future energy distribution system that enables renewable energy integration. It generally consists of multiple distributed generators (DGs) that are usually interfaced to the grid through power inverters. For the islanding operation of AC microgrids, two important tasks are to share the load demand among multiple parallel connected inverters proportionately and maintain the voltage and frequency stabilities. This paper reviews and categorizes various approaches of power sharing control principles. Simultaneously, the control schemes are graphically illustrated. Moreover, various control approaches are compared in terms of their respective advantages and disadvantages. Finally, the paper presents the future trends.