Advanced SVPWM Techniques for Multi-Level Inverters: Enhancing Performance and Reducing Complexity

Recent advancements in electric vehicle (EV) technology have underscored the critical role of inverters. Traditional Pulse Width Modulation (PWM) schemes, commonly used by Original Equipment Manufacturers (OEMs), involve complex timing calculations and lengthy algorithms. This scheme proposes a novel method that eliminates the need for sector and region identification by utilizing sampled values of reference phase voltages, thereby reducing computational efforts and complexities. The proposed scheme can generate N-level PWM signals and offers the flexibility to operate with fewer levels, including in the overmodulation range. The process begins with the conversion of sampled reference phase voltages into timing signals. These timing signals are then processed by an algorithm designed to modify the modulating signals. The modulating signals are individually decoded to generate PWM pulses for each phase, making the scheme applicable to any multilevel inverter configuration. This innovative approach simplifies the generation of PWM signals and enhances the efficiency of the inverter system. To validate the performance of the proposed scheme, the timing signals are applied to a five-level inverter formed by cascading two three-level inverters. The system's effectiveness is demonstrated using an open-end winding induction motor drive. Extensive simulations are conducted in MATLAB and Simulink software to verify the scheme's performance under various operating conditions. The results indicate that the proposed SVPWM method significantly reduces computational complexity while maintaining high performance and flexibility. This advancement in PWM technology has the potential to improve the efficiency and reliability of inverters used in electric vehicles, contributing to the overall progress in EV technology. The novel approach presented offers a promising solution for the challenges associated with traditional PWM schemes, paving the way for more efficient and adaptable inverter systems in the future.