GRID-FORMING WIND-STORAGE INTEGRATED SYSTEM BASED ON THREE-PORT NINE SWITCH CONVERTER

Meng Qingtian; Ren Yongfeng; Hang Yuqi; Liu Huiqiang; He Bin; Liu Xiaokai

doi:10.19912/j.0254-0096.tynxb.2024-1626

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (1) : 345-353. DOI: 10.19912/j.0254-0096.tynxb.2024-1626

GRID-FORMING WIND-STORAGE INTEGRATED SYSTEM BASED ON THREE-PORT NINE SWITCH CONVERTER

Meng Qingtian^1,2, Ren Yongfeng², Hang Yuqi³, Liu Huiqiang^1,2, He Bin², Liu Xiaokai¹

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Abstract

To address the issues of insufficient active power support, overcurrent, and power oscillations that easily occur in direct-drive wind turbine under traditional virtual synchronous generator （VSG） control during fault ride-through conditions, a grid-forming wind-storage integrated system based on a three-port nine-switch converter is proposed. This system achieves high integration of power electronic devices and effective power support, and optimizes power distribution between wind and storage to avoid large variations in wind turbine speed, maintaining operation at the maximum power point. To enhance the fault ride-through capability of the wind-storage integrated system, the VSG control strategy is improved with the maximum converter current as the boundary condition, enhancing reactive power support and DC-side voltage stability with the aid of the energy storage device. This approach also helps absorb the unbalanced power that cannot be delivered due to current constraints, reducing the risk of current limit violations. A system model is established in Simulink, and the proposed topology and control strategy are validated under three different scenarios： wind speed fluctuations, grid frequency disturbances, and voltage faults. Simulation results indicate that the proposed topology and control strategy enable real-time wind power tracking and provide strong active power support and fault ride-through capability.

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wind turbines / electric energy storage / electric machine control / nine-switch converter / virtual synchronous generator / fault ride-through

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Meng Qingtian, Ren Yongfeng, Hang Yuqi, Liu Huiqiang, He Bin, Liu Xiaokai. GRID-FORMING WIND-STORAGE INTEGRATED SYSTEM BASED ON THREE-PORT NINE SWITCH CONVERTER[J]. Acta Energiae Solaris Sinica. 2026, 47(1): 345-353 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1626

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