Nine Level Modular Multilevel Converter with Modified Level Shift Modulation Technique for Reduced Switching Frequency
نویسندگان
1 Electrical Department, Government Engineering College, Bharuch, Gujarat, India
2 Power Electronics Department, Government Engineering College, LE college Morbi Gujarat, India
3 EC Department, Government Engineering College, Modasa, Gujarat, India
4 Electrical Department, The Maharaja Sayajirao University of Baroda, Gujarat, India
5 EC Department, Government Engineering College, Modasa, Gujarat, India
doi
10.5829/ije.2025.38.03c.10چکیده
This study introduces a new approach to Pulse Width Modulation (PWM) known as the adapted DC level shift PWM technique (DC-PWM), which is applied to a nine level modular multilevel converter. This modulation technique involves interleaving the modulated waveform with a Direct Current (DC) level, while ensuring that quarter wave symmetry is preserved. By implementing an adjusted level shift 1/4 DC-phase disposition (PD) PWM and 2/4 DC PDPWM modulation technique, the switching frequency of the Nine level Modular Multilevel Converter (MMC) has been successfully reduced. The technique's effectiveness has been confirmed through validation using Simulink/MATLAB and an experimental setup. The simulation results show a notable decrease in the frequency of action switching. When it comes to harmonic performance for phase voltage, line voltage, and capacitor voltage, the Type-3 1/4 DC-PDPWM technique generally outperforms the 2/4 DC-PDPWM technique. The 2/4 DC-PDPWM Type-2 demonstrates impressive performance, particularly in terms of phase current and capacitor voltage %THD. The selection of these techniques will be determined by the specific performance needs and the trade-offs in complexity and harmonic suppression that are deemed acceptable for the intended use.
