Open AccessDistributed droop control of dc microgrid for improved voltage regulation and current sharing
Author(s) -
Kumar Rohit,
Pathak Mukesh K.
Publication year - 2020
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
eISSN - 1752-1424
pISSN - 1752-1416
DOI - 10.1049/iet-rpg.2019.0983
Subject(s) - voltage droop , microgrid , converters , voltage drop , voltage , controller (irrigation) , low voltage , control theory (sociology) , computer science , distributed generation , voltage regulation , electrical engineering , voltage regulator , control (management) , engineering , renewable energy , agronomy , artificial intelligence , biology
DC microgrid is becoming popular because of its high efficiency, high reliability and connection of distributed generation with energy storage devices and dc loads. The main objective in the dc microgrid is to keep the dc bus voltage constant and equalise per unit current sharing among converters. The conventional droop control is used to equalise per unit current sharing similar to reactive power sharing in an ac microgrid. Nevertheless, the problem in conventional droop control is that equal current leads to a reduction of dc bus reference voltage and voltage regulation becoming unequal across each node due to unequal line resistance drop. The proposed controller works on adaptive droop and voltage shifting technique, which equalises the current sharing whether line resistances are similar or not and controls each output voltage to follow the respective bus reference voltage. The isolated dc–dc converters are used to simulate and validate the proposed control technique.