Volume 8, Issue 5, September 2019, Page: 127-144
Control Power Sharing of Parallel Inverters in Microgrid with Consideration of Line Impedance Effect
Xuan Hoa Thi Pham, Department of Electrical and Electronic Engineering, University of Food Industry, Ho Chi Minh City, Vietnam
Toi Thanh Le, Department of Electrical and Electronic Engineering, University of Food Industry, Ho Chi Minh City, Vietnam
Hieu Tran Trong, Department of Electrical and Electronic Engineering, University of Food Industry, Ho Chi Minh City, Vietnam
Received: Oct. 2, 2019;       Accepted: Oct. 21, 2019;       Published: Oct. 25, 2019
DOI: 10.11648/j.epes.20190805.15      View  20      Downloads  10
Abstract
This paper presents a power sharing control method for use between paralleled three-phase inverters in an islanded microgrid. In this study, the mismatch of power sharing when the line impedances have significant differences for inverters connected to a microgrid has been solved, the accuracy of power sharing in an islanded microgrid is improved, the voltage droop slope is tuned to compensate for the mismatch in the voltage drops across line impedances by using communication links. The method will ensure in accurate power sharing even if the communication is interrupted. If the load changes while the communication is interrupted, the accuracy of power sharing is reduced but the proposed method is better than the conventional droop control method. In addition, the accuracy of power sharing base on the proposed method is not affected by the time delay in the communication channel and local loads at the output of the inverters. The control model has been simulated in Matlab/Simulink with two or three inverters are connected in parallel. Simulation results demonstrate the accuracy of the proposed control method. Futhermore, in order to validate the theoretical analysis and simulation results, an experimental setup was built in the laboratory. Results obtained from the experimental setup verify the effectiveness of the proposed method.
Keywords
Droop Control, Power Sharing, Microgrid Control, Parallel Inverter, Line Impedance
To cite this article
Xuan Hoa Thi Pham, Toi Thanh Le, Hieu Tran Trong, Control Power Sharing of Parallel Inverters in Microgrid with Consideration of Line Impedance Effect, American Journal of Electrical Power and Energy Systems. Vol. 8, No. 5, 2019, pp. 127-144. doi: 10.11648/j.epes.20190805.15
Copyright
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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