A Hybrid PWM-Based DC-Link Voltage Balancing Algorithm for a Three-Level NPC DC/AC Traction Inverter Drive

摘要: This paper presents a hybrid pulsewidth modulation (H-PWM) technique, for three-level neutral point clamped electric vehicle (EV) traction inverter drive. The proposed strategy depicts the advantages of both classic space-vector PWMs (SV-PWMs) as well carrier-based PWM (CB-PWM). duty cycles switches are calculated by CB-PWM, to reduce computational time and control complexity system. redundancies switching states then used balance two dc-link capacitor voltages, similar SV-PWM-based strategy. scheme is capable maintaining difference between voltages wider range machine speed-torque variations. Furthermore, single carrier PWM, instead multiple carriers, which further reduces complexity. A detailed comparative study carried out, prove performance low loss-based SV-PWM techniques, previously authors present H-PWM In addition, total harmonic distortion voltage current (%THD $_{{{v},i}}$ ), switches, power loss, balancing capabilities also compared. ability changing potential demonstrated. Detailed simulation experimental studies out with 6 kW, surface-mounted permanent magnet synchronous machine. Simulation test results desired scheme.