GRID-FORMING DWTG PRIMARY FREQUENCY REGULATION CONTROL WITH DC SIDE ENERGY STORAGE

Wu Zengyu; Zhao Bo; Liu Lei; Zhang Kuan

doi:10.19912/j.0254-0096.tynxb.2024-1369

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (12) : 671-680. DOI: 10.19912/j.0254-0096.tynxb.2024-1369

GRID-FORMING DWTG PRIMARY FREQUENCY REGULATION CONTROL WITH DC SIDE ENERGY STORAGE

Wu Zengyu, Zhao Bo, Liu Lei, Zhang Kuan

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Abstract

To address the challenge of insufficient primary frequency regulation in grid-connected wind turbines during frequency disturbances, a control strategy is proposed that integrates energy storage on the DC side of direct-drive wind turbines. Firstly, this strategy incorporates a virtual synchronous generator （VSG） control method in the grid-side converter to deliver immediate power support during frequency fluctuations. Furthermore, the addition of a DC-side energy storage system ensures rapid stabilization of the DC voltage to its reference value during frequency dips, allowing the machine-side converter to maintain stable operation in maximum power point tracking mode. Meanwhile, the grid-side converter enhances power output, enabling the wind turbine to perform primary frequency regulation. The proposed approach is validated using simulations of a single-machine system and a four-machine two-area system in Matlab/Simulink. Results indicate that, compared to traditional grid-connected wind turbines, this method increases power output by 24.2% and reduces frequency drop depth by 60% during sudden load changes, demonstrating superior primary frequency regulation capabilities.

Key words

wind power / permanent magnet synchronous generator / direct-driven wind turbine / virtual synchronous generator / energy storage system / primary frequency regulation

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Wu Zengyu, Zhao Bo, Liu Lei, Zhang Kuan. GRID-FORMING DWTG PRIMARY FREQUENCY REGULATION CONTROL WITH DC SIDE ENERGY STORAGE[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 671-680 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1369

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