华南理工大学学报(自然科学版) ›› 2015, Vol. 43 ›› Issue (8): 15-20.doi: 10.3969/j.issn.1000-565X.2015.08.003

• 动力与电气工程 • 上一篇    下一篇

并网逆变器的改进型复合控制

桂存兵 谢运祥 程丽 王裕   

  1. 华南理工大学 电力学院,广东 广州 510640
  • 收稿日期:2014-09-29 修回日期:2015-03-12 出版日期:2015-08-25 发布日期:2015-07-01
  • 通信作者: 桂存兵(1974-),男,博士,副教授,主要从事电力电子技术在电力系统中的应用研究. E-mail:ahui200491@126.com
  • 作者简介:桂存兵(1974-),男,博士,副教授,主要从事电力电子技术在电力系统中的应用研究.
  • 基金资助:
    广东省教育部产学研结合项目(2011B090400136)

Improved Composite Control of Grid-Connected Inverter

Gui Cun-bing  Xie Yun-xiang  Cheng Li  Wang Yu   

  1. School of Electric Power,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2014-09-29 Revised:2015-03-12 Online:2015-08-25 Published:2015-07-01
  • Contact: 桂存兵(1974-),男,博士,副教授,主要从事电力电子技术在电力系统中的应用研究. E-mail:ahui200491@126.com
  • About author:桂存兵(1974-),男,博士,副教授,主要从事电力电子技术在电力系统中的应用研究.
  • Supported by:
    Supported by the Project of Integration of Industry,Education and Research of Guangdong Province and Ministry of Education of China(2011B090400136)

摘要: 针对低阻尼三阶系统 LCL 滤波器容易发生谐振的现状,采用并网电流和电容电流双闭环控制策略对并网电流进行控制,并在此基础上设计了采用自适应性改进型内模和插入式结构的重复控制器,同传统的 PI 控制结合构成新的改进型复合控制,从而提高了其稳定性,减小了入网电流的谐波,提高了并网逆变器的性能. 通过仿真和实验验证了所提复合控制方案的可行性与优越性. 无论电网电压频率是否变动,该方案都可以在有效避免进网电流谐振的同时实现进网电流的高功率因数.

关键词: LCL 滤波器, 自适应型内模, 改进型重复控制, 频率, 自适应性

Abstract: The LCL filter is a third-order system of a low damping,where resonanceis easy to occur. Aiming at the
issue,this paper adopts a dual-loop control strategy with the grid-connected current feedback and the capacitor current feedback to control the grid-connected current,and then designs a novel repetitive controller,which possesses a modified self-adaptive internal model and is plugged in the system. This repetitive controller is combined with the traditional PI control to form a new improved composite control scheme,thus improving the working stability of the LCL filter,minimizing the current harmonic distortion and increasing the performance of the grid-connected inverter. Finally,the feasibility and superiority of the improved scheme are verified by simulations and experiments. Besides,whether the voltage frequency of power systems changes or not,the improved scheme can effectively avoid the resonance of grid currents and can achieve a high in-grid power factor.

Key words: LCL filter, a modified self-adaptive internal model, modified repetitive control, freguency, adaptability