Coupling Characteristics Analysis between Transient Rotor Angle Instability and Transient Over-voltage in Combined Generating System of Thermal Power and New Energy

YANG Yuxin; WANG Jinsong; ZHU Yongli; GAO Benfeng; YANG Haichao; WU Jian; {{custom_author.name_en}}

doi:10.13334/j.0258-8013.pcsee.242468

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Coupling Characteristics Analysis between Transient Rotor Angle Instability and Transient Over-voltage in Combined Generating System of Thermal Power and New Energy

更新时间：2026-10-19

- Coupling Characteristics Analysis between Transient Rotor Angle Instability and Transient Over-voltage in Combined Generating System of Thermal Power and New Energy
- Vol. 46, Issue 8, Pages: 3080-3090(2026)
- 作者机构：
  
  1. 1
  2. 华北电力大学电气与电子工程学院,河北省,保定市,071003
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.242468
  CLC：
- Received：21 March 2025，
  
  Published：2026
- 稿件说明：
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YANG Yuxin, WANG Jinsong, ZHU Yongli, et al. Coupling Characteristics Analysis between Transient Rotor Angle Instability and Transient Over-voltage in Combined Generating System of Thermal Power and New Energy[J]. 2026, 46(8): 3080-3090.
DOI：

YANG Yuxin, WANG Jinsong, ZHU Yongli, et al. Coupling Characteristics Analysis between Transient Rotor Angle Instability and Transient Over-voltage in Combined Generating System of Thermal Power and New Energy[J]. 2026, 46(8): 3080-3090. DOI： 10.13334/j.0258-8013.pcsee.242468.

摘要

火电-新能源组合送出系统中，火电机组暂态功角失稳和新能源机端暂态过电压是限制通道外送能力的重要问题，该文旨在研究上述两种问题的影响因素、耦合特性及其对安全稳定的影响。首先，建立考虑新能源负阻抗特性的火电机组功角变化解析方程，分析新能源接入后的火电机组暂态功角稳定新特性；其次，基于戴维南等效及矢量分析法对新能源机端暂态过电压进行解析，分析暂态过电压影响因素；接着，通过公式分析及电磁暂态仿真，指出无功盈余与功角摇摆两类暂态过电压的耦合关系。最后，以某实际工程为算例，分析不同场景的主导风险模式，提出两种风险综合约束下的运行方式。研究成果可为新形势下火电-新能源组合能源基地的安全稳定运行提供技术参考。

Abstract

In a thermal power-renewable energy combined transmission system

the transient power rotor angle instability of thermal power units and the transient over-voltage at the renewable energy generator terminals are important issues that limit the transmission capacity. First

an analytical equation for the power rotor angle variation of thermal power units considering the negative impedance characteristics of new energy is established

and the new transient power rotor angle stability characteristics of thermal power units after the integration of new energy are analyzed. Secondly

based on the Thévenin equivalent and vector analysis method

the transient over-voltage at the new energy machine terminal is analyzed

and the influencing factors of transient over-voltage are discussed. Next

through formula analysis and electromagnetic transient simulations

the coupling relationship between two types of transient over-voltages is highlighted. Finally

using a practical engineering case as an example

this study analyzes the dominant risk modes under different scenarios

and proposes operational modes under two integrated risk constraints. The research results provide technical references for the safe and stable operation of thermal power-renewable energy combined energy bases in the new situation.

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