Research on the Hybrid Wind–Solar–Energy Storage AC/DC Microgrid System and Its Stability during Smooth State Transitions

Qiushuo Li (), Xinwei Dong, Mengru Yan, Zhao Cheng and Yu Wang
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Qiushuo Li: School of Electrical and Engineering, China University of Mining and Technology, Xuzhou 221116, China
Xinwei Dong: School of Electrical and Engineering, China University of Mining and Technology, Xuzhou 221116, China
Mengru Yan: School of Electrical and Engineering, China University of Mining and Technology, Xuzhou 221116, China
Zhao Cheng: School of Electrical and Engineering, China University of Mining and Technology, Xuzhou 221116, China
Yu Wang: School of Electrical and Engineering, China University of Mining and Technology, Xuzhou 221116, China

Energies, 2023, vol. 16, issue 24, 1-20

Abstract: The hybrid AC/DC microgrid is an independent and controllable energy system that connects various types of distributed power sources, energy storage, and loads. It offers advantages such as a high power quality, flexibility, and cost effectiveness. The operation states of the microgrid primarily include grid-connected and islanded modes. The smooth switching between these two states is a key technology for ensuring the flexible and efficient operation of the microgrid. In this paper, the typical structure of an AC–DC hybrid microgrid and its coordination control strategy are introduced, and an improved microgrid model is proposed. Secondly, an adaptive current–voltage–frequency integrated control method based on signal compensation is proposed to solve the impulse current and voltage generated during the switching between a grid-connected state and an off-grid state. Finally, in response to unplanned grid-connected scenarios, an improved pre-synchronization control strategy based on BP neural networks is introduced to rapidly restore stable operation. The proposed control strategies enhanced the steady-state and transient stability of the hybrid wind–solar–energy storage AC/DC microgrid, achieving seamless grid-connected and islanded transitions without disturbances. The simulation and experimental results validated the correctness and effectiveness of the proposed theories.

Keywords: hybrid AC/DC microgrid; smooth switching between grid-connected and islanded modes; control strategies; BP neural networks algorithm; stability 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: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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