Mechanism Analysis of Subsynchronous Oscillation in Direct-driven Wind Turbine Based on Non-smooth Bifurcation

Ancheng XUE; Zizhe WANG; Xiaoyu FU; Jiawei WANG; Dengke QIAO

doi:10.7500/AEPS20190714001

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Mechanism Analysis of Subsynchronous Oscillation in Direct-driven Wind Turbine Based on Non-smooth Bifurcation

Basic Research | 更新时间：2025-06-16

- Mechanism Analysis of Subsynchronous Oscillation in Direct-driven Wind Turbine Based on Non-smooth Bifurcation
- Automation of Electric Power Systems Vol. 44, Issue 7, Pages: 87-92(2020)
- 作者机构：
  
  新能源电力系统国家重点实验室，华北电力大学，北京市 102206
- 作者简介：
- 基金信息：
  
  National Key R&D Program of China;National Natural Science Foundation of China
- DOI：10.7500/AEPS20190714001
  CLC：
- Received：14 July 2019，
  
  Revised：2019-11-20，
  
  Published Online：24 February 2020，
  
  Published：10 April 2020
- 稿件说明：
移动端阅览
薛安成,王子哲,付潇宇等.基于非光滑分叉的直驱风机次同步振荡机理分析[J].电力系统自动化,2020,44(7):87-92.

XUE Ancheng,WANG Zizhe,FU Xiaoyu,et al.Mechanism Analysis of Subsynchronous Oscillation in Direct-driven Wind Turbine Based on Non-smooth Bifurcation[J].Automation of Electric Power Systems,2020,44(7):87-92.
薛安成,王子哲,付潇宇等.基于非光滑分叉的直驱风机次同步振荡机理分析[J].电力系统自动化,2020,44(7):87-92. DOI： 10.7500/AEPS20190714001.

XUE Ancheng,WANG Zizhe,FU Xiaoyu,et al.Mechanism Analysis of Subsynchronous Oscillation in Direct-driven Wind Turbine Based on Non-smooth Bifurcation[J].Automation of Electric Power Systems,2020,44(7):87-92. DOI： 10.7500/AEPS20190714001.

摘要

新能源大规模并网引发的振荡问题近来得到广泛关注。目前，忽略变流器的限幅等非线性特性，在稳态工作点附近线性化得到的小信号模型是研究上述振荡问题的主流方法。然而，在某些条件下，变流器中的限幅环节对振荡特性的影响不可忽视。结合相图分析方法，揭示直驱风机次同步频段振荡的数学机理之一是与限幅相关的非光滑分叉。首先，介绍了与限幅环节有关的非线性非光滑分叉理论。其次，介绍了直驱风机并网系统的限幅环节及其和限幅相关的次同步频段振荡现象。再次，分析了不同限幅环节对次同步频段振荡特性的影响，揭示了定子直流电压限幅环节饱和是导致系统振荡的原因。进一步，分析了短路比对系统振荡特性的影响，揭示了参数变化导致的非光滑分叉现象。最后，分析了交流故障持续时间、接地电阻对振荡的影响，揭示了初值导致的非光滑分叉现象。分析表明，直驱风机并网系统在故障清除后产生的次同步频段振荡，是在足够大的故障冲击下多个限幅环节共同作用产生的，数学上，也对应着相应的动力学系统发生非光滑分叉。

Abstract

Recently

the oscillations with the interconnection of the large-scale renewable energy have received extensive attention. At present

the small signal model near the stable operation point

which ignores the nonlinear characteristics such as limits of converter

is very popular. In fact

the influence of the limits of the converter on the oscillation characteristics cannot be ignored under certain conditions. This paper reveals that one of the mathematical mechanisms of the subsynchronous band oscillation(SSBO) of the power system interconnected with direct-driven wind turbine is the non-smooth bifurcation related to oscillation limits with the phase portrait analysis. Firstly

the nonlinear non-smooth bifurcation theory related to the limits is introduced. Secondly

the limit links of the power system interconnected with direct-driven wind turbine and the subsynchronous frequency band oscillation phenomenon related to the limits is presented. And then

the influence of different limits on the characteristics of the SSBO is analyzed

and the phenomenon of saturation of the stator DC voltage limit is the main cause of the SSBO is revealed. Furthermore

the characteristics of SSBO with different short circuit ratios (SCRs) are analyzed and the non-smooth bifurcation caused by changing parameters is revealed. Finally

the effect of AC fault duration and grounding resistance on SSBO is analyzed

and the non-smooth bifurcation caused by caused by initial value is revealed. The analysis shows that the SSBO in the power system interconnected with direct-driven wind turbine after the fault cleared is induced by multiple limits with a sufficiently large disturbance

which causes large deviation from the stable equilibrium point. Mathematically

the occurrence of the SSBO is corresponding to the non-smooth bifurcation in the dynamic system.

关键词

Keywords

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