标题：A Low-pass Filter Method to Suppress the Voltage Variations Caused by Introducing Droop Control in DC Microgrids
作者：Li, Fulong; Lin, Zhengyu; Cao, Wenping; Chen, Alian; Wu, Jiande
作者机构：[Li, Fulong; Lin, Zhengyu; Cao, Wenping] Aston Univ, Elect Elect & Power Engn, Birmingham B4 7ET, W Midlands, England.; [Chen, Alian] Shandong Univ, 更多
会议名称：10th IEEE Annual Energy Conversion Congress and Exposition (ECCE)
会议日期：SEP 23-27, 2018
来源：2018 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE)
关键词：DC microgrids; droop coefficient; droop control; low pass filter
摘要：Small-scale DC microgrids have been popular in recent years due to their flexibility and wide applications. Droop control is one of the most widely applied control method in interface converters for a DC microgrid. However, methods to select proper droop coefficients or droop coefficient zones are rarely discussed in reported literatures. This paper analyzes the impact caused by large droop coefficients from loop-gain perspective, and proposes a low pass filer method to avoid the significant DC bus voltage variations, which is harmful to the power quality and voltage-based control strategies. Also, a droop coefficient zone is defined according to the current sharing and DC bus voltage variations. A simulation study has been implemented to validate the proposed droop coefficient zone and feasibility of the proposed low pass filer method.