Analysis of Sub-synchronous Oscillation Based on Two-dimensional Residues in a Hybrid Wind-PV Farm via Series Compensation Grid Connection System

ZHU Xiaowen; XIAO Shiwu; WANG Lichao

doi:10.19725/j.cnki.1007-2322.2023.0296

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Analysis of Sub-synchronous Oscillation Based on Two-dimensional Residues in a Hybrid Wind-PV Farm via Series Compensation Grid Connection System

更新时间：2025-10-22

- Analysis of Sub-synchronous Oscillation Based on Two-dimensional Residues in a Hybrid Wind-PV Farm via Series Compensation Grid Connection System
- Vol. 42, Issue 5, Pages: 901-910(2025)
- 作者机构：
  
  1. 华北电力大学电气与电子工程学院, 北京市昌平区,102206
  2. 国网新疆电力有限公司电力科学研究院, 新疆维吾尔自治区,乌鲁木齐市,830000
- 作者简介：
- 基金信息：
- DOI：10.19725/j.cnki.1007-2322.2023.0296
  CLC： 5
- Published：2025
- 稿件说明：
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ZHU Xiaowen, XIAO Shiwu, WANG Lichao. Analysis of Sub-synchronous Oscillation Based on Two-dimensional Residues in a Hybrid Wind-PV Farm via Series Compensation Grid Connection System[J]. 2025, 42(5): 901-910.
DOI：

ZHU Xiaowen, XIAO Shiwu, WANG Lichao. Analysis of Sub-synchronous Oscillation Based on Two-dimensional Residues in a Hybrid Wind-PV Farm via Series Compensation Grid Connection System[J]. 2025, 42(5): 901-910. DOI： 10.19725/j.cnki.1007-2322.2023.0296.

摘要

随着我国“双碳”目标的提出，风力与光伏发电技术得到广泛应用。但风电场与光伏电站电力电子装置间的耦合作用及新能源场站与串补间的动态交互作用会给系统带来次同步振荡风险，影响新能源消纳能力，因此有必要对风光混合电场经串补并网系统的稳定性进行研究。首先，采用状态空间法建立双馈风机和光伏机组的数学模型，得到二者的阻抗传递函数；其次，基于复转矩系数法，将一维留数表示的电气阻尼特性推广到二维留数表示的阻抗特性上，通过留数权重确定主振荡模式，从而实现高阶传递函数简化，便于分析特定频段的阻抗特性，通过伯德图验证简化方法的有效性；最后，基于简化后的传递函数，通过求解特征值参与因子和留数可观性、可控性相关因子，得到影响次同步振荡的强相关状态变量及主导参数，并通过PSCAD仿真研究了主导参数变化对系统次同步振荡稳定性的影响，为次同步振荡抑制措施的制定提供理论依据。

Abstract

With the proposal of the "carbon peaking and carbon neutrality" goal

wind and photovoltaic power generation technologies have found a wide application. However

the coupling effect between the power electronics of wind and photovoltaic farms

as well as the dynamic interaction between the renewable energy station and the series compensation

poses a risk of sub-synchronous oscillation to the system and affects the consumption capacity of renewable energy. Therefore

it is of great importance to study the stability of the hybrid wind-PV farm via series compensation grid connection system. Firstly

the state-space method is used to establish the mathematical model of doubly fed induction generator and PV unit

and the impedance transfer functions of the two are derived. Secondly

based on the complex torque coefficient method

the electrical damping characteristics expressed by the one-dimensional residues are generalized to the impedance characteristics expressed by the two-dimensional residues. The determination of the main oscillation mode is achieved by the weight of residues

thereby realizing simplification of the high-order transfer function and facilitating the analysis of the impedance characteristics of specific frequency bands. Also

the effectiveness of the simplified method is verified by the Bode diagram. Finally

by solving the eigenvalue participation factor and the residue observability and controllability correlation factors

the strongly correlated state variables and dominant parameters which affect the sub-synchronous oscillation are obtained based on the simplified transfer function. The influence of these dominant parameters on the sub-synchronous oscillation stability of system is studied through PSCAD simulation

which provides a theoretical basis for the formulation of sub-synchronous oscillation suppression measures.

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references

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