Harmonic Analysis of Three-Level Carrier-Based PWM and LCL Filter Design
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In this paper, we introduce the fundamental concepts and principles of three-level carrier-based PWM harmonic analysis and LCL filter design. We begin by detailing the working mechanism of three-level carrier PWM, including MATLAB implementation approaches using phase-disposition and phase-shifted carrier techniques for waveform generation. Next, we delve into harmonic analysis methods, covering harmonic sources, characteristics, and mathematical modeling with FFT algorithms for spectrum computation. We then present LCL filter design principles, addressing parameter calculation using iterative optimization algorithms, circuit topology selection, and performance evaluation through Bode plot analysis. Finally, we demonstrate practical applications through case studies showing PWM harmonic suppression using Simulink simulations, while discussing design trade-offs and future development directions in power electronics systems.
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