弱电网下基于功率前馈的光伏并网逆变器稳定性分析
作者:
作者单位:

东北大学

作者简介:

通讯作者:

中图分类号:

TP273

基金项目:

国家重点研发计划(2018YFA0702200);中央高校基本科研业务费项目(N2004013)


Stability analysis of grid-connected photovoltaic inverter based on power feedforward under weak grid condition
Author:
Affiliation:

Northeastern University

Fund Project:

National Key R&D Program of China under grant (2018YFA0702200);The Fundamental Research Funds for the Central Universities (N2004013)

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    摘要:

    光伏并网逆变器的直流侧电压在光照强度、温度等外界环境的影响下通常是波动的,这会对弱电网下光伏并网系统的稳定性产生影响。针对这一问题,在传统控制系统中引入基于功率前馈的电压控制回路,并给出其结构和参数的设计过程。在此基础上,对光伏并网逆变器的输出阻抗进行建模,并分析不同控制器下对应的输出阻抗的频率特性,又利用奈奎斯特稳定性判据,分析了弱电网下光伏并网系统的稳定性。最后,通过仿真验证本文提出控制策略的有效性。

    Abstract:

    DC side voltage of grid-connected photovoltaic inverter usually fluctuates under the influence of external environment such as light intensity and temperature, which will affect the stability of grid-connected photovoltaic system under weak current network. To solve this problem, a voltage control loop based on power feed forward is introduced into the traditional control system, and the design process of its structure and parameters is given. On this basis, the output impedance of the grid-connected photovoltaic inverter is modeled, and the frequency characteristics of the corresponding output impedance under different controllers are analyzed. The stability of the grid-connected photovoltaic system under weak current is analyzed by using the Nyquist stability criterion. Finally, the effectiveness of the proposed control strategy is verified by simulation.

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历史
  • 收稿日期:2020-11-13
  • 最后修改日期:2021-01-19
  • 录用日期:2021-02-10
  • 在线发布日期: 2021-03-03
  • 出版日期: