• CSCD核心库收录期刊
  • 中文核心期刊
  • 中国科技核心期刊

电力建设 ›› 2020, Vol. 41 ›› Issue (4): 117-125.doi: 10.3969/j.issn.1000-7229.2020.04.014

• 新能源发电 • 上一篇    下一篇

基于谐波阻抗特性的风电次同步振荡分析

袁丽丽,阳育德,覃智君,刘辉   

  1. 广西大学电气工程学院,南宁市 530004
  • 出版日期:2020-04-01
  • 作者简介:袁丽丽(1994),女,通信作者,硕士研究生,主要研究方向为电力系统次同步振荡分析; 阳育德(1974),男,博士,副教授,主要研究方向为电力系统稳定性分析; 覃智君(1977),男,副教授,研究方向为电力系统优化、高性能数值计算以及信息技术在电力系统中的应用等; 刘辉( 1979) ,男,教授,主要研究方向为电力系统优化控制、电动汽车、需求响应等。
  • 基金资助:
    国家自然科学基金项目(51767001)

Analysis of Sub-Synchronous Oscillation in Wind Farm According to Harmonic Impedance Characteristics

YUAN Lili, YANG Yude, QIN Zhijun, LIU Hui   

  1. College of Electrical Engineering, Guangxi University, Nanning 530004, China
  • Online:2020-04-01
  • Supported by:
    This work is supported by National Natural Science Foundation of China(No. 51767001).

摘要: 近年来,随着风力发电并网容量增加,电力电子技术被广泛使用,从而引发了新型次同步振荡问题。为应对该问题,提出了一种基于谐波阻抗特性的风电次同步振荡分析方法。通过IEEE第一标准模型对该方法的准确性和有效性进行了验证。文章建立了直驱风电场时域仿真系统,对机侧和网侧换流器进行详细建模仿真,并通过谐波阻抗特性对其进行分析,避免公式的推导和计算。结果表明,风机电力电子换流器在振荡频率下呈现较小的负值,即换流器表现为具有电容性的负阻抗,换流器呈现的电容性阻抗与交流电网的电感形成谐振回路,故系统存在次同步振荡的威胁。

关键词: 直驱风机, 次同步振荡, 谐波阻抗, 频率特性

Abstract: Recently, capacity of grid-connected wind power has increased, and power electronics technology has been widely used, causing new sub-synchronous oscillation problems. In order to cope with the problem, this paper proposes a method for analyzing the resonance characteristics of wind farms on the basis of impedance measurement. The effectiveness of the method is validated through the first IEEE benchmark model. A time-domain simulation model including direct-driven PMSGs and power electronic converters is established and it is analyzed on the basis of harmonic impedance measurement, which avoids complex formula derivations and calculations. The results show that the converter behaves as capacitive with negative impedance. The capacitive impedance of the converter forms a resonant loop with the inductance of the AC grid and causes unstable sub-synchronous oscillation.

Key words: direct-drive PMSG, sub-synchronous oscillation, harmonic impedance, frequency characteristicse 

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