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单级光伏并网多逆变器系统并联交互影响分析

陈维荣 王璇 李奇

陈维荣, 王璇, 李奇. 单级光伏并网多逆变器系统并联交互影响分析[J]. 西南交通大学学报, 2020, 55(4): 811-819. doi: 10.3969/j.issn.0258-2724.20180900
引用本文: 陈维荣, 王璇, 李奇. 单级光伏并网多逆变器系统并联交互影响分析[J]. 西南交通大学学报, 2020, 55(4): 811-819. doi: 10.3969/j.issn.0258-2724.20180900
CHEN Weirong, WANG Xuan, LI Qi. Parallel Interaction Influence of Single-Stage Photovoltaic Grid-Connected Multi-Inverter System[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 811-819. doi: 10.3969/j.issn.0258-2724.20180900
Citation: CHEN Weirong, WANG Xuan, LI Qi. Parallel Interaction Influence of Single-Stage Photovoltaic Grid-Connected Multi-Inverter System[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 811-819. doi: 10.3969/j.issn.0258-2724.20180900

单级光伏并网多逆变器系统并联交互影响分析

doi: 10.3969/j.issn.0258-2724.20180900
详细信息
    作者简介:

    陈维荣(1965—),男,教授,博士生导师,研究方向为电力系统及其自动化、燃料电池技术及其应用, E-mail: wrchen@swjtu.cn

    通讯作者:

    李奇(1984—),男,教授,博士生导师,研究方向为分布式发电并网技术、电力系统无功优化, E-mail: liqi0800@163.com

  • 中图分类号: V221.3

Parallel Interaction Influence of Single-Stage Photovoltaic Grid-Connected Multi-Inverter System

  • 摘要: 在弱电网条件下,多逆变器间、多逆变器与电网间的动态交互作用影响着电力系统的电能质量和稳定性,易引发谐波谐振等问题. 为了研究单级光伏并网多逆变器系统的谐波谐振特性,考虑光伏源与系统之间的交互作用,采用模态分析法对谐振问题进行了系统的分析与讨论. 首先,根据三相单级式光伏并网系统结构及控制策略,建立了多逆变器戴维南等效模型;其次,通过构建多逆变器系统节点导纳矩阵,应用了一种能够确定系统谐振频率、谐振中心以及各节点参与程度的模态分析方法,从逆变器台数、外界环境、输电距离3个方面研究了系统谐振特性与变化规律;最后,基于MATLAB/Simulink仿真平台,通过搭建三相单级式光伏并网多逆变器系统仿真模型,验证了模态分析法的正确性与有效性. 研究结果表明:当逆变器台数增加时,低频谐振频率呈降低趋势,依次为30、27、25次谐波,高频谐振频率为2 230 Hz保持不变;当外界环境温度降低时,低频谐振频率逐渐升高,依次为22、23、24次谐波,高频谐振频率固定约为2 225 Hz;当输电距离增长时,低频与高频谐振频率均逐渐降低且变得接近.

     

  • 图 1  三相单级式光伏并网多逆变器系统结构

    Figure 1.  Structure diagram of three-phase single-stage photovoltaic grid-connected multi-inverter system

    图 2  系统控制框图

    Figure 2.  Block diagram of system control

    图 3  多逆变器戴维南等效模型

    Figure 3.  Thevenin equivalent model of multi-inverters

    图 4  模态分析法流程

    Figure 4.  Flow chart of modal analysis method

    图 5  多逆变器模态阻抗曲线

    Figure 5.  Multi-inverter modal impedance curve

    图 6  外界环境变化时模态分析结果

    Figure 6.  Modal analysis results when external environment changes

    图 7  输电距离变化时模态分析结果

    Figure 7.  Modal analysis results when transmission distance changes

    图 8  逆变器台数变化时节点电压频谱分析图

    Figure 8.  Spectrum analysis of node voltage when the number of inverters changes

    图 9  外界环境变化时节点电压频谱分析

    Figure 9.  Spectrum analysis of node voltage when external environment changes

    图 10  输电距离变化时节点电压频谱分析

    Figure 10.  Spectrum analysis of node voltage when transmission distance changes

    表  1  系统仿真参数

    Table  1.   Parameters of system simulation

    参数数值 参数数值
    光伏开路电压 Uoc/V880 光伏 MPP 电压 Um/V700
    光伏短路电流 Isc/A15.9 光伏 MPP 电流 Im/A14.7
    电网电压 Ug/V220 逆变器侧电感 L1/mH4
    电网频率 fg/Hz50 网侧电感 L2/mH0.6
    电网阻抗 Lg/mH0.5 滤波电容 C/μF10
    开关频率 fs/kHz10 直流链电容 CDC/μF2 000
     注:MPP—maximum power point.
    下载: 导出CSV

    表  2  逆变器台数变化时各节点参与因子

    Table  2.   Participation factor with variable inverter number

    节点n = 2 n = 4 n = 6
    f = 1 545 Hzf = 2 230 Hz f = 1 355 Hzf = 2 230 Hz f = 1 250 Hzf = 2 230 Hz
    10.0820.063 0.0320.026 0.0170.014
    20.4180.437 0.2180.224 0.1490.152
    30.5000.500 0.5650.083 0.8330.040
    4 0.1900.569 00.091
    5 00.098 00.415
    6 00.046
    7 00.325
    下载: 导出CSV

    表  3  不同输电距离下模态分析结果

    Table  3.   Modal analysis results underdifferent transmission distances

    l/kmf/Hz模态阻抗/Ω
    3955975.5
    1 160686.2
    6745764.7
    880584.2
    21525562.3
    550501.3
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-11-12
  • 修回日期:  2019-05-22
  • 网络出版日期:  2020-03-06
  • 刊出日期:  2020-08-01

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