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An Improved Droop Control Method for DC Microgrids Based on Low Bandwidth Communication With DC Bus Voltage Restoration and Enhanced Current Sharing Accuracy

Open access
Lu, Xiaonan, Guerrero, Josep M., Sun, Kai, Vasquez, Juan C.·2014·IEEE Transactions on Power Electronics

Abstract

Droop control is the basic control method for load current sharing in dc microgrid applications. The conventional dc droop control method is realized by linearly reducing the dc output voltage as the output current increases. This method has two limitations. First, with the consideration of line resistance in a droop-controlled dc microgrid, since the output voltage of each converter cannot be exactly the same, the output current sharing accuracy is degraded. Second, the dc-bus voltage deviation increases with the load due to the droop action. In this paper, in order to improve the performance of the dc microgrid operation, a low-bandwidth communication (LBC)-based improved droop control method is proposed. In contrast with the conventional approach, the control system does not require a centralized secondary controller. Instead, it uses local controllers and the LBC network to exchange information between converter units. The droop controller is employed to achieve independent operation, and the average voltage and current controllers are used in each converter to simultaneously enhance the current sharing accuracy and restore the dc bus voltage. All of the controllers are realized locally, and the LBC system is only used for changing the values of the dc voltage and current. Hence, a decentralized control scheme is accomplished. The simulation test based on MATLAB/Simulink and the experimental validation based on a 2 × 2.2 kW prototype were implemented to demonstrate the proposed approach.

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Metadata

Authors
Lu, X., Guerrero, J. M., Sun, K., & Vasquez, J. C.
Venue
IEEE Transactions on Power Electronics
Published
2014-04
Volume
29
Issue
4
Pages
1800-1812
ISSN
  • 0885-8993 (ISSN-L)
  • 1941-0107
OpenAlex
W2127086830
Cited by
1,049
References
23
FWCI
93.82
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: An Improved Droop Control Method for DC Microgrids Based on Low Bandwidth Communication With DC Bus Voltage Restoration and Enhanced Current Sharing Accuracy. https://app.cochat.ai/papers/10.1109/tpel.2013.2266419
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Lu, X., Guerrero, J. M., Sun, K., & Vasquez, J. C. (2014). 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. https://doi.org/10.1109/tpel.2013.2266419

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