Simulation of Three-Phase Diode Rectifier Using SIMULINK MATLAB

This document provides a comprehensive guide on simulating a three-phase diode rectifier using SIMULINK MATLAB. We will explore the fundamental principles of rectifier operation and demonstrate how to construct the simulation model in SIMULINK. The implementation involves using Power Electronics library components including three-phase voltage source, diode bridge blocks, and load configurations. Key simulation parameters such as input voltage characteristics, output current waveforms, and filtering components will be discussed in detail. The modeling approach includes configuring the three-phase source with appropriate phase angles (120-degree separation) and implementing the six-diode bridge configuration using SIMULINK's built-in Universal Bridge block set to diode mode. We will analyze critical factors in the simulation process including AC input voltage stability, DC output ripple characteristics, and load current variations. Finally, we will validate the model accuracy through simulation results using scope blocks for waveform analysis and measurements blocks for quantitative data collection. The results will include THD (Total Harmonic Distortion) analysis of input current and FFT analysis of output voltage using SIMULINK's powergui tool. This article aims to enhance understanding of three-phase rectifier operation and practical application of SIMULINK MATLAB for power electronics simulations.