A Simplified Control Method for Tie-Line Power of DC Micro-Grid

Yanbo Che, Jinhuan Zhou, Tingjun Lin, Wenxun Li and Jianmei Xu
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Yanbo Che: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Jinhuan Zhou: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Tingjun Lin: College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China
Wenxun Li: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
Jianmei Xu: Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China

Energies, 2018, vol. 11, issue 4, 1-13

Abstract: Compared with the AC micro-grid, the DC micro-grid has low energy loss and no issues of frequency stability, which makes it more accessible for distributed energy. Thus, the DC micro-grid has good potential for development. A variety of renewable energy is included in the DC micro-grid, which is easily affected by the environment, causing fluctuation of the DC voltage. For grid-connected DC micro-grid with droop control strategy, the tie-line power is affected by fluctuations in the DC voltage, which sets higher requirements for coordinated control of the DC micro-grid. This paper presents a simplified control method to maintain a constant tie-line power that is suitable for the DC micro-grid with the droop control strategy. By coordinating the designs of the droop control characteristics of generators, energy storage units and grid-connected inverter, a dead band is introduced to the droop control to improve the system performance. The tie-line power in the steady state is constant. When a large disturbance occurs, the AC power grid can provide power support to the micro-grid in time. The simulation example verifies the effectiveness of the proposed control strategy.

Keywords: DC micro-grid; tie-line power; droop control; dead band (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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