A Modified PID Controller Design For 3-Phase SPWM Multilevel Inverter

Ahmed Nasir, Aizzat Hafizuddin (2019) A Modified PID Controller Design For 3-Phase SPWM Multilevel Inverter. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text (24 Pages) A Modified PID Controller Design For 3-Phase SPWM Multilevel Inverter - 24 Pages.pdf - Submitted Version Download (5MB)

Abstract

Multilevel inverter is an evolved version of the conventional inverter and have risen in favour by many in industries out of its capability to operate for medium to high rating power equipment. It boast several advantages over inverter such as generating higher voltage using low rating equipment, produce a more pure sinusoidal voltage wave with increasing levels and less losses from the switching frequency. This project is to analyse a 3-phase 5-level multilevel inverter with sinusoidal pulse width modulation (SPWM) by using a PI and modified PID controller as a method to maintain desire output by using MATLAB and MATLAB Simulink. The gating component applied are the MOSFETS that acts as the switching component. The feedback controller of PI and modified PID are also designed and calculated and then tuned on MATLAB with trial and error through proper procedure an applied to ensure a steady voltage output of the 3-phase 5-level cascaded h-bride multilevel inverter. The results are analysed in the form of total harmonic distortion (THD) and power factor where the CHMI have low THD and power factor of ~1. The performance of both controller are also analysed and compared where modified PID is slight better as it have better response which ia average at 0.126s compare than that of PI at 0.157s and more robust if there is disturbance or voltage change.

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