Multi-swing Transient Instability of Synchronous Machines Induced by Coupling Between Rotor Angle Oscillations and LVRT Control Switching of Renewable Energy Sources

LI Bingfang; YANG Songhao; HU Yiwen; HAO Zhiguo; ZHANG Yubo; ZHAO Ming

doi:10.13334/j.0258-8013.pcsee.242215

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Multi-swing Transient Instability of Synchronous Machines Induced by Coupling Between Rotor Angle Oscillations and LVRT Control Switching of Renewable Energy Sources

更新时间：2026-10-05

- Multi-swing Transient Instability of Synchronous Machines Induced by Coupling Between Rotor Angle Oscillations and LVRT Control Switching of Renewable Energy Sources
- Vol. 46, Issue 3, Pages: 863-874(2026)
- 作者机构：
  
  1. 西安交通大学电气工程学院,陕西省,西安市,710049
  2. 南瑞集团有限公司(国网电力科学研究院有限公司),江苏省,南京市,211106
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.242215
  CLC：
- Published：2026
- 稿件说明：
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LI Bingfang, YANG Songhao, HU Yiwen, et al. Multi-swing Transient Instability of Synchronous Machines Induced by Coupling Between Rotor Angle Oscillations and LVRT Control Switching of Renewable Energy Sources[J]. 2026, 46(3): 863-874.
DOI：

LI Bingfang, YANG Songhao, HU Yiwen, et al. Multi-swing Transient Instability of Synchronous Machines Induced by Coupling Between Rotor Angle Oscillations and LVRT Control Switching of Renewable Energy Sources[J]. 2026, 46(3): 863-874. DOI： 10.13334/j.0258-8013.pcsee.242215.

摘要

系统受扰后，同步机功角摇摆引起相邻新能源并网点电压波动，可能周期性地触发其低电压穿越控制。而新能源低穿控制的切入和退出又会影响同步机的功角摇摆动态，引发暂态功角失稳风险。为探究同步机首摆稳定前提下后续摇摆过程中新能源低穿切换对同步机功角稳定性的影响，首先，建立新能源与同步机联合送出系统的暂态稳定分析模型；然后，推导同步机功角与新能源并网点电压的解析关系，给出状态量表征的低穿控制切换条件；其次，基于暂态能量函数法分析周期性低穿控制切换过程中同步机暂态能量的变化，进而揭示同步机多摆失稳机理；然后，提出该切换系统保守稳定边界的评估方法；最后，时域仿真验证理论分析的正确性。

Abstract

After system disturbances

the rotor angle oscillation of synchronous machines may cause voltage fluctuations at adjacent grid connection nodes of renewable energy sources (RESs)

periodically triggering low voltage ride-through (LVRT) control. The activation and deactivation of LVRT controls

in turn

affect the dynamics of the synchronous machine’s rotor angle swing

leading to transient rotor angle instability risks. To investigate the impact of LVRT switching on rotor angle stability during subsequent swings

assuming the first swing is stable

this paper first establishes a transient stability analysis model for the RES and SYNs combined system. Then the analytic relationship between the rotor angle of synchronous machines and the voltage of RES grid connection points is derived to obtain switching conditions for LVRT control represented by state variables. Subsequently

the changes in transient energy of the synchronous machine during periodic LVRT switching are analyzed by the transient energy function method to reveal the mechanism of the synchronous machine’s rotor angle multi-swing instability. Afterward

an assessment method for the conservative stability boundary of the switching system is proposed. Finally

the correctness of the theoretical analysis is verified through time-domain simulation.

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