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

Zhiping Cheng, Zhongwen Li, Jing Liang, Jinfeng Gao, Jikai Si and Shuhui Li
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Zhiping Cheng: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Zhongwen Li: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Jing Liang: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Jinfeng Gao: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Jikai Si: School of Electrical Engineering, Zhengzhou University, Zhengzhou 450001, China
Shuhui Li: Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA

Energies, 2019, vol. 12, issue 7, 1-22

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.

Keywords: bus voltage control; DC microgrid; droop control; distributed consensus; economic power dispatch (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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