Abstract This paper presents a design method based on the extended harmonic domain modeling for L and LCL passive filters of active-front-end PWM two-level voltage source converters for grid-connected renewable energy sources. The proposed design method is tested under several operating scenarios, such as high and low power levels and switching frequencies. Also, a dedicated graphical user interface (GUI) with five other design methods is provided to ease the evaluation of the proposed design method. The GUI also computes the power quality indexes and the steady-state waveforms for each design methodology. In addition to this, an in-depth overview of filtering technologies and applications is presented to identify the primary practical use of passive filtering and to justify the use of LCL filter in grid-connected systems. The obtained results show that the proposed design method leads to the smallest passive filter parameters, and it is the only method that fulfills all the imposed power quality requirements as well as power specifications.

中文翻译：

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并网可再生能源的最优LCL滤波器设计方法

摘要 本文提出了一种基于扩展谐波域建模的并网可再生能源有源前端PWM两电平电压源换流器L和LCL无源滤波器的设计方法。所提出的设计方法在多种操作场景下进行了测试，例如高低功率电平和开关频率。此外，还提供了具有其他五种设计方法的专用图形用户界面 (GUI)，以简化对所建议设计方法的评估。GUI 还计算每种设计方法的电能质量指数和稳态波形。除此之外，还深入介绍了滤波技术和应用，以确定无源滤波的主要实际用途，并证明在并网系统中使用 LCL 滤波器的合理性。