Modal Identification and Analysis of Photovoltaic Converter Based on Random Subspace

Jianhua ZHU; Zhenqing LI; Lichang XU

doi:10.12096/j.2096-4528.pgt.19141

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Modal Identification and Analysis of Photovoltaic Converter Based on Random Subspace

Energy Internet | 更新时间：2025-07-04

- Modal Identification and Analysis of Photovoltaic Converter Based on Random Subspace
- Power Generation Technology Vol. 42, Issue 2, Pages: 201-206(2021)
- 作者机构：
  
  1.润电能源科学技术有限公司, 河南省郑州市 450000
  2.华电电力科学研究院有限公司, 浙江省杭州市 310030
- 作者简介：
- 基金信息：
- DOI：10.12096/j.2096-4528.pgt.19141
  CLC： TK01;TM712
- Received：30 April 2020，
  
  Published：30 April 2021
- 稿件说明：
移动端阅览
Jianhua ZHU, Zhenqing LI, Lichang XU. Modal Identification and Analysis of Photovoltaic Converter Based on Random Subspace[J]. Power Generation Technology, 2021, 42(2): 201-206.
DOI：

Jianhua ZHU, Zhenqing LI, Lichang XU. Modal Identification and Analysis of Photovoltaic Converter Based on Random Subspace[J]. Power Generation Technology, 2021, 42(2): 201-206. DOI： 10.12096/j.2096-4528.pgt.19141.

摘要

光伏大量并网给电网带来大量谐波谐振问题。针对光伏变流器产生的谐振问题，建立了包含光伏变流器和电网等值阻抗的联合模型。推导了含有光伏变流器阻抗和电网阻抗的

域模型，应用反拉普拉斯变换得到的光伏输出电流不仅含有电压频率分量，还含有光伏阻抗的谐振分量。应用随机子空间方法分析光伏并网点和电流含有的模态分量，对照两者模态的区别，提取出光伏变流器阻抗模态。最后，通过仿真和实测数据分析验证了该方法的有效性。

Abstract

A large number of photovoltaic grid-connection brings many harmonic resonance problems to the power grid. A joint model including photovoltaic converter and grid equivalent impedance was established for the photovoltaic converter resonance problem. The

-domain model of photovoltaic converter impedance and grid impedance was derived. The photovoltaic output current contains not only the voltage frequency component but also the resonant component of the photovoltaic impedance by using the inverse Laplace transform. The stochastic subspace method was used to analyze the modal components of photovoltaic grid-connection points and currents. The impedance modes of photovoltaic converters were extracted according to the difference between the two modes. Finally

the effectiveness of the proposed method was verified by simulation and experimental data analysis.

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