Research on Flexible Virtual Inertia Control Method Based on the Small Signal Model of DC Microgrid

Shengyang Lu, Tongwei Yu, Huiwen Liu (), Wuyang Zhang, Yuqiu Sui, Junyou Yang, Li Zhang, Jiaxu Zhou and Haixin Wang
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Shengyang Lu: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Tongwei Yu: Electric Power Research Institute of State Grid Liaoning Electric Power Co., Ltd., Shenyang 110006, China
Huiwen Liu: School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
Wuyang Zhang: Electric Power Research Institute of State Grid Liaoning Electric Power Co., Ltd., Shenyang 110006, China
Yuqiu Sui: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Junyou Yang: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China
Li Zhang: School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
Jiaxu Zhou: Electric Power Research Institute of State Grid Liaoning Electric Power Co., Ltd., Shenyang 110006, China
Haixin Wang: School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China

Energies, 2022, vol. 15, issue 22, 1-14

Abstract: Renewable energy is usually connected to the DC micro-grid by a large number of power electronic devices, which have the advantages of a fast system response, but the disadvantage to reduce the inertia of the system, which makes the stability of the system worse. It is necessary to increase the inertia of DC micro-grid so that it can recover and stabilize well when it receives a disturbance. In this paper, a small-signal model of DC micro-grid with constant power load (CPL) is established, and a flexible virtual inertial (FVI) control method based on DC bus voltage real-time variation is proposed, by controlling the DC/DC converter of the energy storage system, the problem of system oscillation caused by introducing voltage differential link to the system is solved. Compared with the droop control method, the FVI control method can increase the inertia of DC micro-grid system, reduce the influence of small disturbances, and improve the stability of the system. Finally, the validity of the FVI control method based on small signal model is verified in dSPACE.

Keywords: DC microgrid; small-signal model; flexible virtual inertia control (FVI); stability analysis; constant power load (CPL) (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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