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Influence of the output impedance of an inverter on its droop control strategies in a microgrid

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Title Influence of the output impedance of an inverter on its droop control strategies in a microgrid
 
Creator Rajendran, Madhuvanthani
Govindasamy, Sundar
 
Subject Distributed generation
Microgrid
Inverter
Droop control technique
Output impedance
 
Description 411-427
The objective of this paper is to present a comprehensive review of the various droop control strategies employed to
control the operation of the parallel inverters present in a microgrid, based onits output impedance. Predominantly, the
output impedances of the inverters are inductive due to the line impedance and filter but in low power systems, the inverter
has a resistive output impedance. The various categories under which the droop control strategies of inverters with inductive
output impedance fall have been reviewed, along with its pros and cons. Although most of the inverters have inductive
output impedance, inverters with resistive output impedance are superior due to the easier compensation of harmonics.
Along with their advantages the various disadvantages present in the droop control strategies utilized for inverters with
resistive output impedance and the solutions to overcome these problems are presented. Recent studies have shown that
inverters with capacitive output impedance provide the lowest Total Harmonic Distortion along with reliable regulation of
voltage and accurate power sharing. The technique of obtaining an inverter with capacitive output impedance along with its
various advantages has also been presented. The universal droop strategy utilized for all types of inverters without prior
knowledge of their output impedances is reviewed along with an example, to overcome the problem of having to change the
droop equations according to the output impedance of the inverter. Lastly a few case studies related to microgrid
implementation have been analyzed along with its challenges as well as standards and policies.
 
Date 2022-08-16T06:13:36Z
2022-08-16T06:13:36Z
2022-08
 
Type Article
 
Identifier 0975-1017 (Online); 0971-4588 (Print)
http://nopr.niscpr.res.in/handle/123456789/60290
https://doi.org/10.56042/ijems.v29i4.47943
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJEMS Vol.29(4) [AUG 2022]