Open AccessDecentralised voltage balancing in bipolar dc microgrids equipped with trans‐z‐source interlinking converter
Author(s) -
Dadjo Tavakoli Saman,
Khajesalehi Jasem,
Hamzeh Mohsen,
Sheshyekani Keyhan
Publication year - 2016
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.2015.0222
Subject(s) - microgrid , voltage droop , electrical engineering , voltage , converters , computer science , voltage source , boost converter , duty cycle , capacitor , inverter , control theory (sociology) , electronic engineering , engineering , control (management) , artificial intelligence
This study presents an improved version of bipolar dc microgrids in which a distributed voltage‐balancing strategy supplants the central voltage balancer. The improved bipolar dc microgrid is interlinked to the ac grid using a trans‐z‐source inverter for which a new voltage control system is adopted. The shoot‐through duty cycle, d ‐axis current reference, and voltages of dc‐side capacitors are controlled by the proposed voltage control system. A bipolar, bidirectional dc/dc boost converter is designed to fulfil the voltage regulation and voltage‐balancing functions in case the trans‐z‐source inverter is disconnected from the ac grid. A power‐sharing scheme is also proposed in which two droop gains are employed to modify voltage control loops of each converter. Simulations are done for a bipolar dc microgrid involving a trans‐z‐source interlinking converter while local distributed generations (DGs) are interfaced to the microgrid by bipolar boost converters.