The Hierarchical Control Algorithm for DC Microgrid Based on the Improved Droop Control of Fuzzy Logic

Liang Zhang, Kang Chen, Shengbin Chi, Ling Lyu and Guowei Cai
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Liang Zhang: School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Kang Chen: School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Shengbin Chi: School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Ling Lyu: School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China
Guowei Cai: School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China

Energies, 2019, vol. 12, issue 15, 1-17

Abstract: In the direct current (DC) microgrid composed of multiple distributed generations, due to the different distances between various converters and the DC bus in the system, the difference of the line resistance will reduce the current sharing accuracy of the system. The droop control was widely used in the operation control of the DC microgrid. It was necessary to select a large droop coefficient to improve the current sharing accuracy, but a too large droop coefficient will lead to a serious bus voltage drop and affect the power quality. In view of the contradiction between the voltage regulation and load current sharing in the traditional droop control, a hierarchical control algorithm based on the improved droop control of the fuzzy logic was proposed in this paper. By improving the droop curve, the problems of voltage regulation and current sharing were solved simultaneously. The effectiveness of the algorithm was verified by simulation.

Keywords: direct current (DC) microgrid; droop control; fuzzy logic; hierarchical control; current sharing; voltage regulation (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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