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A Feedback Passivation Design for DC Microgrid and Its DC/DC Converters

Feifan Ji, Ji Xiang, Wuhua Li and Quanming Yue
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Feifan Ji: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Ji Xiang: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Wuhua Li: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Quanming Yue: State Grid Zhejiang Electric Power Company, Hangzhou 310007, China

Energies, 2016, vol. 10, issue 1, 1-15

Abstract: There are difficulties in analyzing the stability of microgrids since they are located on various network structures. However, considering that the network often consists of passive elements, the passivity theory is applied in this paper to solve the above-mentioned problem. It has been formerly shown that when the network is weakly strictly positive real (WSPR), the DC microgrid is stable if all interfaces between the microgrid and converters are made to be passive, which is called interface passivity. Then, the feedback passivation method is proposed for the controller design of various DC–DC converters to achieve the interface passivity. The interface passivity is different from the passivity of closed-loop systems on which the passivity based control (PBC) concentrates. The feedback passivation design is detailed for typical buck converters and boost converters in terms of conditions that the controller parameters should satisfy. The theoretical results are verified by a hardware-in-loop real-time labotray (RTLab) simulation of a DC microgrid with four generators.

Keywords: DC microgrid; feedback passivation; distributed control (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: 2016
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