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Title: An Improved Distributed Secondary Control Method for DC Microgrids With Enhanced Dynamic Current Sharing Performance

Abstract

This paper proposes an improved distributed secondary control scheme for dc microgrids (MGs), aiming at overcoming the drawbacks of conventional droop control method. The proposed secondary control scheme can remove the dc voltage deviation and improve the current sharing accuracy by using voltage-shifting and slope-adjusting approaches simultaneously. Meanwhile, the average value of droop coefficients is calculated, and then it is controlled by an additional controller included in the distributed secondary control layer to ensure that each droop coefficient converges at a reasonable value. Hence, by adjusting the droop coefficient, each participating converter has equal output impedance, and the accurate proportional load current sharing can be achieved with different line resistances. Furthermore, the current sharing performance in steady and transient states can be enhanced by using the proposed method. The effectiveness of the proposed method is verified by detailed experimental tests based on a 3 × 1 kW prototype with three interface converters.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Electricity Delivery and Energy Reliability (OE); National Natural Science Foundation of China (NNSFC)
OSTI Identifier:
1337144
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Transactions on Power Electronics; Journal Volume: 31; Journal Issue: 9
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; Current sharing; dc microgrid (MG); droop control; low-bandwidth communication (LBC); secondary control

Citation Formats

Wang, Panbao, Lu, Xiaonan, Yang, Xu, Wang, Wei, and Xu, Dianguo. An Improved Distributed Secondary Control Method for DC Microgrids With Enhanced Dynamic Current Sharing Performance. United States: N. p., 2016. Web. doi:10.1109/TPEL.2015.2499310.
Wang, Panbao, Lu, Xiaonan, Yang, Xu, Wang, Wei, & Xu, Dianguo. An Improved Distributed Secondary Control Method for DC Microgrids With Enhanced Dynamic Current Sharing Performance. United States. doi:10.1109/TPEL.2015.2499310.
Wang, Panbao, Lu, Xiaonan, Yang, Xu, Wang, Wei, and Xu, Dianguo. Thu . "An Improved Distributed Secondary Control Method for DC Microgrids With Enhanced Dynamic Current Sharing Performance". United States. doi:10.1109/TPEL.2015.2499310.
@article{osti_1337144,
title = {An Improved Distributed Secondary Control Method for DC Microgrids With Enhanced Dynamic Current Sharing Performance},
author = {Wang, Panbao and Lu, Xiaonan and Yang, Xu and Wang, Wei and Xu, Dianguo},
abstractNote = {This paper proposes an improved distributed secondary control scheme for dc microgrids (MGs), aiming at overcoming the drawbacks of conventional droop control method. The proposed secondary control scheme can remove the dc voltage deviation and improve the current sharing accuracy by using voltage-shifting and slope-adjusting approaches simultaneously. Meanwhile, the average value of droop coefficients is calculated, and then it is controlled by an additional controller included in the distributed secondary control layer to ensure that each droop coefficient converges at a reasonable value. Hence, by adjusting the droop coefficient, each participating converter has equal output impedance, and the accurate proportional load current sharing can be achieved with different line resistances. Furthermore, the current sharing performance in steady and transient states can be enhanced by using the proposed method. The effectiveness of the proposed method is verified by detailed experimental tests based on a 3 × 1 kW prototype with three interface converters.},
doi = {10.1109/TPEL.2015.2499310},
journal = {IEEE Transactions on Power Electronics},
number = 9,
volume = 31,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}
}