GRID FREQUENCY DISTURBANCE REJECTION ENHANCEMENT FOR POWER LOOP CONTROL OF VIRTUAL SYNCHRONOUS GENERATORS

Yang Bo; Chen Weibin; Li Hao; Li Jinsong; Lu Shuai

doi:10.19912/j.0254-0096.tynxb.2024-2403

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (5) : 110-122. DOI: 10.19912/j.0254-0096.tynxb.2024-2403

GRID FREQUENCY DISTURBANCE REJECTION ENHANCEMENT FOR POWER LOOP CONTROL OF VIRTUAL SYNCHRONOUS GENERATORS

Yang Bo¹, Chen Weibin², Li Hao¹, Li Jinsong¹, Lu Shuai¹

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Abstract

To address the problem that existing studies on virtual synchronous generator （VSG） power control are mainly oriented toward sudden power command change conditions, while insufficient attention has been paid to the transient response characteristics under grid frequency fluctuations, this paper conducts research on grid frequency disturbance response analysis and oscillation suppression methods. First, this paper analyzes various existing typical improvement strategies, and points out that the existing schemes change the transfer function of the grid frequency response loop, thus deteriorating the transient response characteristics under grid frequency disturbances. Based on the analysis, from the perspective of reconstructing the power transmission model, this paper proposes a method for reshaping the VSG power transmission model by adding the amplitude-frequency characteristics to the virtual impedance. Compared with traditional VSG and existing schemes, the proposed scheme can not only improve the power response characteristics but also enhance the ability to resist grid frequency disturbance. Finally, this paper establishes a 20 kW experimental platform and a back-to-back grid-side frequency step generator to verify the effectiveness of the proposed scheme under the above two working conditions.

Key words

virtual synchronous generators / grid-forming inverter / grid frequency disturbance / power command change / power control / low-frequency oscillation

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Yang Bo, Chen Weibin, Li Hao, Li Jinsong, Lu Shuai. GRID FREQUENCY DISTURBANCE REJECTION ENHANCEMENT FOR POWER LOOP CONTROL OF VIRTUAL SYNCHRONOUS GENERATORS[J]. Acta Energiae Solaris Sinica. 2026, 47(5): 110-122 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2403

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