SYNCHRONIZATION STABILITY ANALYSIS OF GRID-CONNECTED PV CONVERTERS CONSIDERING FREQUENCY LIMITER

Gong Diyang; Chen Qiong; Li Zhihao; Tang Yajie; Shi Xiaojie

doi:10.19912/j.0254-0096.tynxb.2024-2365

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (5) : 660-670. DOI: 10.19912/j.0254-0096.tynxb.2024-2365

SYNCHRONIZATION STABILITY ANALYSIS OF GRID-CONNECTED PV CONVERTERS CONSIDERING FREQUENCY LIMITER

Gong Diyang¹, Chen Qiong², Li Zhihao¹, Tang Yajie¹, Shi Xiaojie²

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Abstract

Frequency limiters are typically applied in phase-locked loop （PLL） to prevent large-scale desynchronization between converters and the grid. This study considers the nonlinear characteristics of frequency limiters and investigates the synchronization stability of grid-connected PV converter systems under various operating conditions. Firstly, a negative feedback linear model of the system incorporating the frequency limiter is developed. Based on this model, for both stable and unstable conditions before limiter activation, the describing function method is employed to reveal the intrinsic mechanism of sustained oscillations after limiter activation. The oscillation amplitude and frequency under different limiting values and control parameters are quantitatively calculated. Finally, a hardware-in-the-loop simulation platform based on Typhoon HIL604 is established, and the case-study results verify the accuracy and effectiveness of the proposed analysis method after the limiter is triggered.

Key words

limiters / converter / describing functions / synchronization stability / negative feedback / sustained oscillation

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Gong Diyang, Chen Qiong, Li Zhihao, Tang Yajie, Shi Xiaojie. SYNCHRONIZATION STABILITY ANALYSIS OF GRID-CONNECTED PV CONVERTERS CONSIDERING FREQUENCY LIMITER[J]. Acta Energiae Solaris Sinica. 2026, 47(5): 660-670 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2365

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