An Advanced Modulation Technique Featuring Common Mode Voltage Suppression for Three-Phase Neutral Point Clamped Back to Back Converters

Three-phase back-to-back converters are widely applied in various industrial, commercial, and domestic applications, such as AC motor drives. Due to the non-sinusoidal voltages they generate, a common mode voltage (CMV) appears, leading problems electrical drive systems high-frequency applications. The CMV rapid changes can cause serious problems, including leakage currents flowing through parasitic capacitors inside motor, electromagnetic interference, shaft voltage, bearing that reduce motor’s lifespan. In general, research these effects is divided into two methods: modifying system’s physical structure or improving inverter’s control algorithm. Pulse Width Modulation (PWM) methods commonly used algorithms of CMV. However, adding pulse amplitude modulation PWM helps technique simultaneous width space vectors proposed this paper its destructive systems. based on elimination zero inherent reduction DC link by further CMV; obtained results applying strategy three-phase NPC converter with 738-watt steady-state operating point power showed sufficient behavior efficiency 98.62 percent. Finally, transient performance from no-load full-load condition ensures for industrial