微特电机 ›› 2018, Vol. 46 ›› Issue (1): 71-75.doi: 1004-7018-46-1-71-75

• 驱动控制 • 上一篇    下一篇

弱电网下三相LCL光伏并网逆变器控制策略研究

杨溪源,李彦哲   

  1. 兰州交通大学,兰州 730070
  • 收稿日期:2017-05-27 出版日期:2018-01-28 发布日期:2018-02-26
  • 作者简介:杨溪源(1991-),男,硕士研究生,主要研究方向为新能源储能与并网技术。
  • 基金资助:
    国家留学人员科技活动择优资助项目(25200604)

Research on Control Strategy of Three Phase LCL Photovoltaic Grid-Connected Inverter under Weak Grid

Xi-yuan YANG,Yan-zhe LI   

  1. Lanzhou Jiaotong University,Lanzhou 730070,China
  • Received:2017-05-27 Online:2018-01-28 Published:2018-02-26

摘要:

分析电网阻抗对光伏逆变器的影响,同时提出消除电网阻抗对并网光伏系统稳定性影响的方法:极点配置法。电流控制器采用准比例谐振方法以抑制电网电压对并网电流的影响。在MATLAB中搭建系统仿真,仿真结果表明所提出的极点配置方法能够有效抑制电网阻抗对光伏逆变器稳定性影响,并与准比例谐振控制器结合,提高了入网电流的波形质量。

关键词: 并网逆变器, LCL滤波器, 电网阻抗, 极点配置, 准比例-谐振控制

Abstract:

The influence of grid impedance on PV inverter was analyzed,and the method of eliminating the influence of grid impedance on the stability of grid connected photovoltaic system was put forward. The influence of the grid voltage on the grid connected current was suppressed by the quasi proportional resonant controller. The system simulation was built in MATLAB. The simulation results show that the proposed pole placement method can effectively restrain the influence of grid impedance on the stability of PV inverter, and improve the waveform quality of the grid current by combined with the quasi proportional resonant controller.

Key words: grid-connected inverter, LCL filter, grid impedance, pole assignment, quasi proportional-resonant

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