变流式新能源机组的次/超同步振荡、小扰动同步稳定性与阻抗模型分析

刘威; 谢小荣; 姜齐荣; 毛航银

doi:10.16511/j.cnki.qhdxxb.2022.21.004

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清华大学学报（自然科学版） ›› 2022, Vol. 62 ›› Issue (10) : 1706-1714. DOI: 10.16511/j.cnki.qhdxxb.2022.21.004

电机工程

变流式新能源机组的次/超同步振荡、小扰动同步稳定性与阻抗模型分析

刘威¹, 谢小荣¹, 姜齐荣¹, 毛航银²

作者信息 +

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

LIU Wei¹, XIE Xiaorong¹, JIANG Qirong¹, MAO Hangyin²

Author information +

文章历史 +

摘要

变流式新能源机组并网后可能引发次/超同步振荡。随着运行工况、电网强度和变流器控制参数的变化,次/超同步振荡频率可能逐渐接近工频,变为小扰动同步失稳引发的功率低频振荡问题。该文首先比较了次/超同步振荡和小扰动同步失稳的基本特征,指出用于次/超同步振荡分析的阻抗模型方法同样可用于分析小扰动同步失稳问题。然后,通过数学推导证明了对于同一变流式新能源机组并网系统,基于锁相环(phase-locked loop, PLL)动态方程分析和基于频率耦合阻抗模型分析的等价性,进一步为阻抗模型方法分析小扰动同步稳定性奠定理论基础。最后,通过时域仿真验证了阻抗模型方法分析变流式新能源机组小扰动同步稳定性的准确性。

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.

导出引用

刘威, 谢小荣, 姜齐荣, 毛航银. 变流式新能源机组的次/超同步振荡、小扰动同步稳定性与阻抗模型分析[J]. 清华大学学报（自然科学版）. 2022, 62(10): 1706-1714 https://doi.org/10.16511/j.cnki.qhdxxb.2022.21.004

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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基金

谢小荣,教授,E-mail:xiexr@tsinghua.edu.cn

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收稿日期	出版日期
2021-09-13	2022-10-15
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2022-09-03

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