Sequence Impedance Modeling and Stability Improvement of Flexible Excitation Synchronous Motor System Based on Stator/Rotor Dual Channel Control

LIU Yijiang; LIAO Yuming; ZHANG Jiancheng; LIN Jintian; LI Han; NIAN Heng

doi:10.13334/j.0258-8013.pcsee.251003

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Sequence Impedance Modeling and Stability Improvement of Flexible Excitation Synchronous Motor System Based on Stator/Rotor Dual Channel Control

更新时间：2026-10-10

- Sequence Impedance Modeling and Stability Improvement of Flexible Excitation Synchronous Motor System Based on Stator/Rotor Dual Channel Control
- Vol. 46, Issue 17, Pages: 6450-6464(2026)
- 作者机构：
  
  1. 1 浙江大学工程师学院,浙江省,杭州市,310015
  2. 2 浙江大学电气工程学院,浙江省,杭州市,310027
  3. 3 国网浙江省电力有限公司电力科学研究院,浙江省,杭州市,310014
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.251003
  CLC：
- Published：2026
- 稿件说明：
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LIU Yijiang, LIAO Yuming, ZHANG Jiancheng, et al. Sequence Impedance Modeling and Stability Improvement of Flexible Excitation Synchronous Motor System Based on Stator/Rotor Dual Channel Control[J]. 2026, 46(17): 6450-6464.
DOI：

LIU Yijiang, LIAO Yuming, ZHANG Jiancheng, et al. Sequence Impedance Modeling and Stability Improvement of Flexible Excitation Synchronous Motor System Based on Stator/Rotor Dual Channel Control[J]. 2026, 46(17): 6450-6464. DOI： 10.13334/j.0258-8013.pcsee.251003.

摘要

新能源大规模接入引发宽频振荡问题，对电网中同步电机的安全稳定运行带来严峻挑战。基于全控型电力电子器件，柔性励磁系统不仅保留传统转子侧励磁电压控制通道，还拓展了定子侧无功功率控制通道，可实现定/转子双阻尼通道控制；其在有效降低同步机轴系扭振风险的同时，能够提高新能源接入系统稳定性。为了分析柔性励磁系统在宽频段的振荡抑制能力，该文采用阻抗分析法，建立考虑柔性励磁定/转子双阻尼通道控制、同步机输出特性及定/转子功率控制耦合的柔性励磁同步电机系统宽频域序阻抗模型；基于所建立的阻抗模型，分析柔性励磁同步电机系统控制环节及定/转子双通道控制参数对系统稳定性的影响规律；最后，基于MATLAB/Simulink仿真模型，验证了柔性励磁同步电机系统阻抗模型的正确性及柔性励磁同步电机系统对电网次/超同步振荡抑制的有效性。

Abstract

The large-scale access of new energy causes broadband oscillation

which poses a serious challenge to the safe and stable operation of synchronous motors in the power grid. Based on fully controlled power electronic devices

the flexible excitation system not only retains the traditional rotor side excitation voltage control channel

but also expands the stator side reactive power control channel

which can realize the stator/rotor dual damping channel control; It can effectively reduce the torsional vibration risk of synchronous machine shaft system and improve the stability of new energy access system. In order to analyze the oscillation suppression ability of flexible excitation system in the wide frequency band

the impedance analysis method is used to establish the wide frequency domain sequence impedance model of flexible excitation synchronous motor system considering the flexible excitation stator/rotor dual damping channel control

synchronous machine output characteristics and stator/rotor power control coupling. Based on the established impedance model

the influence of the control link and stator/rotor dual channel control parameters of the flexible excitation synchronous motor system on the system stability is analyzed. Finally

based on the MATLAB/Simulink simulation model

the correctness of the impedance model of the flexible excitation synchronous motor system and the effectiveness of the flexible excitation synchronous motor system in suppressing the sub-synchronous oscillation of the power grid are verified.

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