Virtual impedance based parallel operation of multi-converters in low voltage microgrids

Droop Control Method is effective to the parallel operation of multi-converters without communication system. However, in low voltage microgrids the line impedance is highly resistive, which results in the unbalances of load current sharing among the parallel-connected converters. In this paper, a v...

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Bibliographic Details
Published in2013 2nd International Symposium on Instrumentation and Measurement, Sensor Network and Automation (IMSNA) pp. 1031 - 1036
Main Authors Xiao Hu, Xisheng Tang, Ningning Li, Guowei Zhang
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.12.2013
Subjects
Accuracy
current sharing
Equivalent circuits
Harmonic analysis
Impedance
microgrid
Microgrids
nonlinear load
parallel-connected converters
Power harmonic filters
Reactive power
virtual impedance
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Summary:Droop Control Method is effective to the parallel operation of multi-converters without communication system. However, in low voltage microgrids the line impedance is highly resistive, which results in the unbalances of load current sharing among the parallel-connected converters. In this paper, a virtual impedance control method is proposed to adjust the total equivalent impedance between converters and AC bus, which aims to improve the load current sharing accuracy. Moreover, a multi-structure virtual impedance control loop is presented to distribute the fundamental current and harmonic currents precisely, which can accommodate nonlinear loads current sharing. Simulation results verify that the proposed strategy is correct and effective.
DOI:10.1109/IMSNA.2013.6743457