Sub-/super-synchronous oscillation,small signal synchronizing stability,and impedance model analysis of converter-based renewable power generators

LIU Wei; XIE Xiaorong; JIANG Qirong; MAO Hangyin

doi:10.16511/j.cnki.qhdxxb.2022.21.004

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Journal of Tsinghua University(Science and Technology) ›› 2022, Vol. 62 ›› Issue (10) : 1706-1714. DOI: 10.16511/j.cnki.qhdxxb.2022.21.004

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Sub-/super-synchronous oscillation,small signal synchronizing stability,and impedance model analysis of converter-based renewable power generators

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Abstract

Connecting converter-based renewable power generators (RPGs) to the power grid can cause serious sub-/super-synchronous oscillations (SSO).Changes in the operating conditions,grid strengths,and converter control can cause the SSO frequency to gradually approach the fundamental frequency while then leads to low-frequency small-signal synchronizing stability (SSS) oscillations.This paper compares the characteristics of SSO and SSS oscillations using the impedance model (IM)-based method that has been used to analyze SSO and is believed to be useful for analyzing the low-frequency oscillations caused by synchronous instabilities.Then,a mathematical model is used to show the equivalence between the phase-locked loop (PLL) dynamic equation-based method and the IM based method for the same grid-tied voltage source converter (VSC) system as a theoretical foundation for SSS analyses using the IM-based method.Finally,time-domain simulations verify the accuracy of the IM-based method for analyzing SSS oscillations of converter-based RPGs.

Key words

converter-based renewable power generators (RPGs) / small signal synchronizing stability / sub-/super-synchronous oscillation (SSO) / impedance model / phase-locked loop (PLL) dynamic

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LIU Wei, XIE Xiaorong, JIANG Qirong, MAO Hangyin. Sub-/super-synchronous oscillation,small signal synchronizing stability,and impedance model analysis of converter-based renewable power generators[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(10): 1706-1714 https://doi.org/10.16511/j.cnki.qhdxxb.2022.21.004

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