Looped-chain-based active current sharing strategy in DC microgrids

Open access

Abstract

The integration of renewable energy sources in modern electric grids have drawn increasing attention nowadays. In order to effectively manage large-scale renewable energy sources and achieve flexible and efficient operation, the concept of microgrids have been proposed. Considering the nature of DC outputs in many distributed energy resources (DERs), DC microgrids have been extensively studied in the past years. Among the operational issues in DC microgrids, current sharing issues have become an important topic since it is highly relevant to the operation of DC microgrids. By adopting a proper design of current sharing strategy in DC microgrids, the current rating violations in each interface converter can be successfully avoided. In this paper, a looped-chain-based active current sharing strategy is proposed to realize high accuracy current sharing in DC microgrids. In particular, the output current is shared between the neighboring interface converters. Hence, following a clockwise or counter-clockwise order, a looped-chain-based control diagram can be established to share the reference value of the output current. A final status in the whole DC microgrid is that the output current of every interface converter is equalized. Hence, the desired current sharing objective can be satisfied. A MATLAB simulation model is established to verify the proposed looped-chain-based active current sharing strategy in DC microgrids.

[1] Schenk T., Stokes L.C., The Power of Collaboration: Engaging All Parties in Renewable Energy Infrastructure Development, IEEE Power and Energy Magazine, vol. 11, no. 3, pp. 56-65 (2013).

[2] Arriaga M., Cañizares C.A., Kazerani M., Renewable Energy Alternatives for Remote Communities in Northern Ontario, Canada, IEEE Transactions on Sustainable Energy, vol. 4, no. 3, pp. 661-670 (2013).

[3] Damiano A., Gatto G., Marongiu I., Porru M., Serpi A., Real-Time Control Strategy of Energy Storage Systems for Renewable Energy Sources Exploitation, IEEE Transactions on Sustainable Energy, vol. 5, no. 2, pp. 567-576 (2014).

[4] Hatziargyriou N., Asano H., Iravani R., Marnay C., Microgrids, IEEE Power and Energy Magazine, vol. 5, no. 4, pp. 78-94 (2007).

[5] Morstyn T., Hredzak B., Demetriades G.D., Agelidis V.G., Unified Distributed Control for DC Microgrid Operating Modes, IEEE Transactions on Power Systems, vol. 31, no. 1, pp. 802-812 (2016).

[6] Augustine S., Mishra M.K., Lakshminarasamma N., Adaptive Droop Control Strategy for Load Sharing and Circulating Current Minimization in Low-Voltage Standalone DC Microgrid, IEEE Transactions on Sustainable Energy, vol. 6, no. 1, pp. 132-141 (2015).

[7] Liu Y., Wang J., Li N. et al., Enhanced Load Power Sharing Accuracy in Droop-Controlled DC Microgrids with Both Mesh and Radial Configurations, Energies, vol. 8, no. 5, pp. 3591-3605 (2015).

[8] Lu X., Guerrero J.M., Sun K., Vasquez J.C., An Improved Droop Control Method for DC Microgrids Based on Low Bandwidth Communication With DC Bus Voltage Restoration and Enhanced Current Sharing Accuracy, IEEE Transactions on Power Electronics, vol. 29, no. 4, pp. 1800-1812 (2014).

[9] Moayedi S., Nasirian V., Lewis F.L., Davoudi A., Team-Oriented Load Sharing in Parallel DC-DC Converters, IEEE Transactions on Industry Applications, vol. 51, no. 1, pp. 479-490 (2015).

[10] Nasirian V., Davoudi A., Lewis F.L., Guerrero J.M., Distributed Adaptive Droop Control for DC Distribution Systems, IEEE Transactions on Energy Conversion, vol. 29, no. 4, pp. 944-956 (2014).

[11] Roslan A.M., Ahmed K.H., Finney S.J., Williams B.W., Improved Instantaneous Average Current-Sharing Control Scheme for Parallel-Connected Inverter Considering Line Impedance Impact in Microgrid Networks, IEEE Transactions on Power Electronics, vol. 26, no. 3, pp. 702-716 (2011).

[12] Guerrero J.M., Vasquez J.C., Matas J., de Vicuna L.G., Castilla M., Hierarchical Control of Droop-Controlled AC and DC Microgrids—A General Approach Toward Standardization, IEEE Transactions on Industrial Electronics, vol. 58, no. 1, pp. 158-172 (2011).

Archives of Electrical Engineering

The Journal of Polish Academy of Sciences

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CiteScore 2016: 0.71

SCImago Journal Rank (SJR) 2016: 0.238
Source Normalized Impact per Paper (SNIP) 2016: 0.535

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