Simulating LCL Low-Pass Filters Using MATLAB M-Functions and Simulink Models

In this article, we provide a comprehensive tutorial on simulating LCL low-pass filters using MATLAB. First, we explain the fundamental principles and design methodology of LCL low-pass filters, including component selection and frequency response characteristics. Next, we demonstrate how to implement the filter's transfer function using MATLAB M-files, showing how to define component parameters (inductors L1, L2 and capacitor C) and calculate frequency response using built-in functions like tf() and bode(). We then guide through constructing a visual simulation model in MATLAB Simulink, incorporating electrical components (inductors, capacitors, resistors) and sources with proper connections and solver settings. Finally, we analyze simulation results by comparing time-domain responses and frequency-domain characteristics, evaluating the filter's attenuation performance and stability. Through this tutorial, you will master LCL filter simulation techniques in MATLAB and gain deeper insight into filter design and verification workflows.