GRID-FORMING CONVERTERS CONTROL STRATEGY BASED ON FRACTIONAL-ORDER VIRTUAL SYNCHRONIZATION OF DC-LINKS

Yang Xingwu; Ma Zhaoxu; Wang Ya&#x02019;ni; Liu Chun; Song Jinfeng; Chen Guodong

doi:10.19912/j.0254-0096.tynxb.2024-1426

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (12) : 426-436. DOI: 10.19912/j.0254-0096.tynxb.2024-1426

GRID-FORMING CONVERTERS CONTROL STRATEGY BASED ON FRACTIONAL-ORDER VIRTUAL SYNCHRONIZATION OF DC-LINKS

Yang Xingwu¹, Ma Zhaoxu¹, Wang Ya’ni¹, Liu Chun¹, Song Jinfeng², Chen Guodong²

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Abstract

To address the issue of the decline in the inertia effect due to the rise in the damping effect, this paper integrates the DC capacitor voltage self-synchronization control and fractional order control theory, proposing a novel grid-forming converters based on DCFOVSC （DC link fractional order virtual synchronization control） control strategy. The dynamic characteristics of the DC link capacitance are employed to achieve self-synchronization, and fractional-order control is incorporated to augment the control degrees of freedom, optimize the dynamic characteristics of the system, and furnish sufficient inertia and damping support for the system. In this paper, a small-signal model of the DCFOVSC control strategy is established, and the dynamic performance and influencing factors of the DCFOVSC are discussed using frequency domain analysis. The analysis results demonstrate that the DCFOVSC is capable of stable operation in a weak grid with good robustness. A grid-connected converter based on the proposed control strategy is constructed in Matlab/Simulink, and the effectiveness of the control strategy is verified under four working conditions： active power variation, grid frequency variation, different grid strengths, and grid voltage amplitude variation. Finally, experimental validation is carried out.

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inverters / power system control / voltage control / fractional-order control / virtual synchronous control / voltage-source inverter

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Yang Xingwu, Ma Zhaoxu, Wang Ya’ni, Liu Chun, Song Jinfeng, Chen Guodong. GRID-FORMING CONVERTERS CONTROL STRATEGY BASED ON FRACTIONAL-ORDER VIRTUAL SYNCHRONIZATION OF DC-LINKS[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 426-436 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1426

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