Compensation of Voltage and Current Imbalance in Bipolar DC Microgrids Using a Three-leg DC Electric Spring

Document Type : Original Article

Authors

1 Department of Electrical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran

2 Department of Electerical Engineering- Shahid Bahonar University of Kerman- Kerman- Iran

Abstract

Bipolar DC microgrids with asymmetric loading face the problems of voltage and current imbalance in two poles, which can increase the voltage deviation in microgrid buses and power losses due to the presence of current in the neutral wire. One of the suggested methods to solve the problem of voltage and current imbalance in bipolar microgrids is to use two separate DC electric springs as two controlled smart loads in positive and negative poles. This structure requires a large number of active switches, two separate battery or storage units in the DC link of these two DC electric springs, and a complex control structure. In this paper, a unified three-leg DC electric spring is proposed to compensate voltage and current imbalance in bipolar DC microgrids. Compared with two separate DC electric springs, the proposed structure has less number of active switches and due to its common DC link, only one storage set is used in its structure. The effectiveness of the proposed structure in compensating voltage and current imbalance is confirmed through simulation in the MATLAB/SIMULINK environment.

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TABRIZ JOURNAL OF ELECTRICAL ENGINEERING

Articles in Press, Corrected Proof
Available Online from 07 April 2024

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