Optimized SHE-PWAM with Maximum Harmonic Elimination and Minimum Switching Frequency for PEC9 Inverter
Mohammad Sharifzadeh, Mohammad Babaie, Majid Mehrasa, Gabriel Chouinard, Kamal Al‐Haddad
Abstract
This article introduces an Optimized SHE-Pulse Width and Amplitude Modulation (OSHE-PWAM) for single-DC source, single-phase nine-level Packed E-Cell (PEC9) to suppress maximum harmonic while switching frequency is minimized. PEC9 is a developed compact multilevel inverter based on the horizontal extension of capacitors to provide single auxiliary DC-bus and effective charging and discharging states for active capacitor voltage balancing. Based on the proposed OSHE, both switching angles and DC input voltage amplitude are considered as variable in the conventional SHE equations and new equations are developed to deal with maximum harmonic elimination. On the other hand, OSHE also handles capacitor voltage balancing by defining a symmetrical preprogramed output voltage waveform for establishing SHE equations. Simulation results are attained by Matlab-Simulink and confirm the excellent operation of the OSHE-PWM obtaining maximum harmonic elimination and achieving capacitor voltage balancing in PEC9 inverter while the switching frequency is minimized.