SPWM Technique Implementation for Three-Phase Inverter with Harmonic Analysis

This paper discusses the SPWM technique for three-phase inverters. Simulation analysis has been performed to examine fundamental component improvements with respect to modulation index variation. Additionally, switching frequency variation can be analyzed to shift dominant harmonic components. Further research demonstrates that the SPWM technique not only enhances inverter efficiency but also reduces harmonic distortion, resulting in more stable and cleaner output waveforms. Therefore, implementing high-performance inverter circuits is crucial for various applications including solar and wind energy systems, AC drives, and UPS systems. Key implementation aspects include: - Generation of three-phase sinusoidal reference signals with 120-degree phase shifts - Comparison of carrier waveforms (typically triangular) with modulated sinusoidal signals - PWM pulse generation using logical comparison operations in simulation environments - FFT analysis for harmonic spectrum evaluation at different modulation indices (0.8 to 1.2 range) - Switching frequency optimization algorithms for harmonic redistribution - THD (Total Harmonic Distortion) calculation methods for performance validation The MATLAB implementation typically involves: 1. Defining modulation parameters (ma, mf) and simulation time steps 2. Creating three-phase reference signals using sine wave functions 3. Generating carrier signals with specified switching frequency 4. Implementing comparison logic for gate signal generation 5. Performing spectral analysis using FFT functions 6. Automated parameter sweeping for optimal performance identification