Reduced component Nine Level Inverter with Level Shifted Modulation Controls

¹ Dept.of Electrical and Electronics Engineering, Mohanbabu University, Tirupathi, India
² Dept.of Electrical and Electronics Engineering, Mohanbabu University, Tirupathi, India

^* Corresponding author: naraboyanaharikrishna@gmail.com

Abstract

This article introduces a novel approach to nine-level inverters with trinary input and level shifted modulation control. The technique employs Level Shifted (LS) Pulse Width Modulation (PWM) on a newly proposed topology called Trinary Source Fed Nine-Level Inverter (TSFNLI). The TSFNLI utilizes trinary geometric DC links and minimizes the number of devices required. With eight switches, including 2 bidirectional switching devices, the suggested TSFNLI generates nine levels, achieving the highest voltage level compared to specific sequences while using fewer DC links and devices. Notably, the design produces a negative level without the need for additional circuits like an H-bridge, resulting in reduced voltage stress on switches. In each operating mode, only three switches conduct, leading to fewer switching shifts, lower switching and conduction losses. The LS-PWM technique is applied to the TSFNLI to enhance the Resultant Voltage quality, incorporating Alternate Phase Opposition Disposition (APOD) approaches Simulations conducted using MATLAB-SIMULINK reveal that the APOD methodology reduces THD and distortion factor, while offering higher fundamental RMS Resultant Voltage and Form Factor.