A modified droop control algorithm for DC microgrids to achieve accurate current sharing and improved voltage regulation

Sharma, S and Iyer, VM and Das, PP and Bhattacharya, S (2021) A modified droop control algorithm for DC microgrids to achieve accurate current sharing and improved voltage regulation. In: 36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021, 14-17 Jun 2021, pp. 119-125.

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Abstract

Droop control is a commonly used method for load current sharing among the converters in DC microgrid applications. However, in this method, the current sharing and load voltage regulation are affected by cable resistances and other non-idealities. The conventional droop control method's performance can be improved using secondary control algorithms that involve low-bandwidth communication channels. In this paper, an improved secondary control algorithm is proposed for a multi-source, single load bus DC microgrid system. In the proposed algorithm, the load voltage information is communicated to the individual converters, and there are no communication channels between individual converters. Thus the proposed algorithm achieves accurate current sharing and improved load voltage regulation with reduced communication channels compared to several state-of-the-art approaches. All the controllers in the proposed algorithm are implemented locally, and hence a decentralized control is achieved. The proposed algorithm's effectiveness is validated using circuit simulations and hardware-based experiments on a two converter single load bus DC microgrid system. © 2021 IEEE.

Item Type:	Conference Paper
Publication:	Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the Institute of Electrical and Electronics Engineers Inc.
Keywords:	Circuit simulation; Communication channels (information theory); Decentralized control; Voltage regulators, Communications channels; Current sharing accuracy; Current-sharing; DC microgrid; Droop control; Load voltages; Low-bandwidth communications; Microgrid; Microgrid systems; Secondary control, Bandwidth
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	29 Nov 2021 09:10
Last Modified:	29 Nov 2021 09:10
URI:	http://eprints.iisc.ac.in/id/eprint/70295

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