DC Microgrid Average Voltage Regulation and Current Sharing With Solely Current Communication

Abstract

The primary focus in multibus dc microgrid systems is to achieve simultaneous proportional current sharing and network average voltage regulation. Conventionally, communication-based secondary, along with droop control, is used to achieve these objectives by exchanging both current and voltage information among distributed generators. This brief aims to demonstrate that adopting a modified droop with a washout filter can eliminate the necessity for voltage information exchange in secondary control, thereby reducing the communication burden. The criterion for achieving average voltage regulation solely through exchanging current information is developed through mathematical analysis. The performance of the control strategy is evaluated using simulation studies and a lab-scale hardware prototype model.