巢湖学院学报 ›› 2023, Vol. 25 ›› Issue (6): 123-128.doi: 10.12152/j.issn.1672-2868.2023.06.016

• 工程与技术 • 上一篇    下一篇

基于PLC的模块化多电平变换器变频运行控制

卢志财:闽南理工学院 实践教学中心   

  1. 闽南理工学院 实践教学中心,福建 石狮 362700
  • 收稿日期:2023-04-07 出版日期:2023-11-25 发布日期:2024-05-28
  • 作者简介:卢志财(1983—),男,福建泉州人,闽南理工学院实践教学中心实验师,主要从事电气设计及高校教学管理研究。
  • 基金资助:
    福建省中青年教师教育科研项目(项目编号:JAT200757)

Variable Frequency Operation Control of Modular Multilevel Converter Based on PLC

LU Zhi-cai:Practice Teaching Center, Minnan University of Science and Technology   

  1. Practice Teaching Center, Minnan University of Science and Technology, Shishi Fujian 362700
  • Received:2023-04-07 Online:2023-11-25 Published:2024-05-28

摘要: 常规变换器变频运行控制方法缺乏对变换器各模块之间功率差的定量分析,导致变换器变频运行控制开关频率较高,为此提出基于PLC的模块化多电平变换器变频运行控制研究。根据电压调制原理,将三角载波分为两个模块,用于调整变换器的电压,结合低频工况子模块调整后的电压,计算多电平变换器变频运行误差;根据运行误差定量分析变换器各模块之间的功率差以及PLC技术,构建模块化多电平变换器变频运行控制模型,从而控制变换器变频运行。实验结果表明,所设计模块化多电平变换器变频运行控制方法下的开关频率低至251 Hz,该方法能够优化开关频率的波动。

关键词: PLC, 模块化, 多电平, 变换器, 变频, 运行控制

Abstract: The conventional inverter frequency conversion operation control method lacks quantitative analysis of the power difference between various modules of the converter, resulting in a high switching frequency for inverter frequency operation control. Therefore, a PLC-based study on modular multilevel inverter frequency conversion operation control is proposed. According to the principle of voltage modulation, the triangular carrier wave is divided into two modules, which are used to adjust the voltage of the converter. Combined with the adjusted voltage of the low - frequency operating submodule, the frequency conversion operation error of the multilevel converter is calculated. Based on the quantitative analysis of the power difference between various modules of the converter and PLC technology, a modular multilevel converter variable frequency operation control model is constructed to control the variable frequency operation of the converter. The experimental results show that the switching frequency is as low as 251 Hz under the variable frequency operation control method of modular multilevel converter, and this method can optimize the fluctuation of switching frequency.

Key words: PLC, modularization, multilevel, converter, frequency conversion, operation control

中图分类号: 

  • TM46