A single-phase seven-level ANPC inverter with hybrid modulation for enhanced efficiency and harmonic performance

Area of Science:

• Electrical Engineering
• Power Electronics
• Renewable Energy Systems

Background:

• Switched-capacitor (SC) multilevel inverters (MLIs) are crucial for voltage boosting and capacitor balancing.
• Existing high-efficiency, high-boosting inverters often suffer from increased component count and reduced efficiency.

Purpose of the Study:

• To propose a novel seven-level active neutral point clamped-based SC inverter topology.
• To achieve a voltage boosting of 1.5 with high efficiency and reduced component count.

Main Methods:

• A new SC inverter topology utilizing six switches and six diodes is developed.
• Integration of Level Shifted (LS) PWM with Phase Shifted (PS) PWM strategies is proposed to minimize switching losses.
• Reliability analysis and validation through simulation and hardware implementation.

Main Results:

• The proposed seven-level inverter achieves a voltage boosting of 1.5.
• High efficiency of 98.4% is reported.
• Total Harmonic Distortion (THD) for voltage and current are 22.27% and 10.67%, respectively.

Conclusions:

• The proposed active neutral point clamped-based SC inverter offers a high-efficiency, high-boosting solution.
• The integrated PWM technique effectively reduces switching losses, enhancing overall converter performance.
• The validated results confirm the proposed inverter's effectiveness and reliability for power conversion applications.