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<p>As the penetration of renewable energy resources has increased over the years, the need to reduce high-frequency switching harmonics and distortion in the power grid has become more important than ever before. The LCL filter in a voltage source converter (VSC) has been introduced as a solution to this problem. This paper provides a comprehensive mathematical approach that has been established to design LCL filters for various applications. By applying the conventional methodology to design an LCL filter, a comparative study is presented with the main objective of finding the optimal sizes for the filter components, while ensuring filter stability and efficiency. The proposed design process is tested using PSCAD/EMTDC and MATLAB/Simulink-based models. An averaging mathematical approach was used to balance the component sizes and the filter’s stability. The simulation results indicate that a computational iteration could enhance the system’s performance through further optimization. Four cases are studied for a typical VSC system with an LCL filter. These cases include studying and analyzing the voltage and current signals and their THDs. The proposed design respects the limits on voltage and current distortion to comply with IEEE standards.</p>

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Design, analysis and comprehensive assessment of LCL filters for VSC applications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月23日

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  • Hasan Alrajhi,
  • Syed A. Raza,
  • Hisham Babsail,
  • Abdulrahman Alattas

摘要

As the penetration of renewable energy resources has increased over the years, the need to reduce high-frequency switching harmonics and distortion in the power grid has become more important than ever before. The LCL filter in a voltage source converter (VSC) has been introduced as a solution to this problem. This paper provides a comprehensive mathematical approach that has been established to design LCL filters for various applications. By applying the conventional methodology to design an LCL filter, a comparative study is presented with the main objective of finding the optimal sizes for the filter components, while ensuring filter stability and efficiency. The proposed design process is tested using PSCAD/EMTDC and MATLAB/Simulink-based models. An averaging mathematical approach was used to balance the component sizes and the filter’s stability. The simulation results indicate that a computational iteration could enhance the system’s performance through further optimization. Four cases are studied for a typical VSC system with an LCL filter. These cases include studying and analyzing the voltage and current signals and their THDs. The proposed design respects the limits on voltage and current distortion to comply with IEEE standards.