MECHANISM AND SUPPRESSION STRATEGY OF FORCED OSCILLATION TRIGGERED BY INTERHARMONICS IN LARGE-SCALE GRID-CONNECTED PHOTOVOLTAIC SYSTEMS

Ge Jinming; Zhai Junlong; Li He; Wang Zhenhao; Wang Chaobin; Dong Yuwei

doi:10.19912/j.0254-0096.tynxb.2025-1091

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (12) : 142-152. DOI: 10.19912/j.0254-0096.tynxb.2025-1091

MECHANISM AND SUPPRESSION STRATEGY OF FORCED OSCILLATION TRIGGERED BY INTERHARMONICS IN LARGE-SCALE GRID-CONNECTED PHOTOVOLTAIC SYSTEMS

Ge Jinming¹, Zhai Junlong¹, Li He², Wang Zhenhao¹, Wang Chaobin¹, Dong Yuwei¹

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Abstract

Maximum power point tracking （MPPT） control for large-scale photovoltaic power generation leads to a large amount of interharmonics output from PV inverters, which may trigger forced power oscillations of other photovoltaic power generation system at the confluence end. In this regard, the forced oscillation mechanism of the forced system triggered by interharmonics in PV power plants is analyzed and a suppression strategy combining phase-shift compensation and active damping is proposed. Firstly, a typical model of a large-scale PV power plant and a PV power generation unit is established, and the mechanism of MPPT control generating interharmonic disturbance sources is analyzed. Then, on the basis of analyzing the inherent modes of the forced system, the mechanism of the forced oscillations of the forced system triggered by the interharmonic perturbation source is elaborated using the equivalent perturbation equation. Subsequently, the effects of the interharmonic disturbance source amplitude and the forced system damping on the forced oscillation amplitude are considered, and a forced oscillation suppression strategy combining phase-shift compensation and active damping is proposed. Finally, the effectiveness of the suppression strategy proposed in this paper in reducing the oscillation amplitude is verified by simulation analysis.

Key words

photovoltaic power generation / interharmonics / forced power oscillation / phase shift compensation / active damping

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Ge Jinming, Zhai Junlong, Li He, Wang Zhenhao, Wang Chaobin, Dong Yuwei. MECHANISM AND SUPPRESSION STRATEGY OF FORCED OSCILLATION TRIGGERED BY INTERHARMONICS IN LARGE-SCALE GRID-CONNECTED PHOTOVOLTAIC SYSTEMS[J]. Acta Energiae Solaris Sinica. 2026, 47(12): 142-152 https://doi.org/10.19912/j.0254-0096.tynxb.2025-1091

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