Study of Harmonics and THD of Nine Phase PWM Inverter Drive with CLC Filter for motor drive applications

摘要

Most of the applications 60% of loads are motor driven loads, more than 90% of these loads are used for industrial applications. Many applications use three phase motor drive which limits torque density. Multiphase motor drives are better solutions for high torque density and heavy loads. In this work a Nine Phase Inverter is designed to drive nine phase load, along with fundamental frequency the load consist of harmonics. These harmonics are higher than fundamental frequencies and cause total harmonic distortion (THD) which enhances the current harmonics and generates heat in the load. Many techniques are used to suppress the harmonics to minimize the heat in the load. A common technique is employed in this paper to minimize THD by constructing CLC filter in the PWM inverter and simulated using Simulink/Matlab, the results are compared with the normal Nine Phase inverter.