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Energies 2019, 12(7), 1400; https://doi.org/10.3390/en12071400

Distributed Economic Power Dispatch and Bus Voltage Control for Droop-Controlled DC Microgrids

1
School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
2
Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 4 March 2019 / Revised: 29 March 2019 / Accepted: 9 April 2019 / Published: 11 April 2019
(This article belongs to the Section Smart Grids and Microgrids)
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Abstract

This paper proposes a distributed economic power dispatch (EPD) and bus voltage control solution for droop-controlled DC microgrids. For the proposed solution, a local power controller and a local voltage controller are added for each distributed generator (DG) to overcome the limitations of the conventional droop control. The power controller generates the first voltage correction term by comparing the local output power of DG with the reference instruction generated by the proposed distributed EPD algorithm, and thus, it can reduce the operation cost of the microgrid by optimally sharing the load demand among all the participating DGs. The voltage controller generates the second voltage correction term by comparing the nominal DC bus voltage value with the average bus voltage generated by the proposed distributed average bus voltage observation (ABVO) algorithm, and thus, it can realize the global bus voltage regulation of the DC microgrid. In contrast with conventional solutions, the control solution can distribute the computational and communication burdens among all the DGs working in parallel, which is more flexible, scalable, and robust against single-point failure. The effectiveness of the proposed control solution is demonstrated through simulation studies. View Full-Text
Keywords: bus voltage control; DC microgrid; droop control; distributed consensus; economic power dispatch bus voltage control; DC microgrid; droop control; distributed consensus; economic power dispatch
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Cheng, Z.; Li, Z.; Liang, J.; Gao, J.; Si, J.; Li, S. Distributed Economic Power Dispatch and Bus Voltage Control for Droop-Controlled DC Microgrids. Energies 2019, 12, 1400.

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