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A HYBRID PWM BASED DC-LINK VOLTAGE BALANCING ALGORITHM FOR A 3-LEVEL NEUTRAL- POINT-CLAMPED (NPC) DC/AC TRACTION INVERTER DRIVE ABSTRACT This paper presents a hybrid pulse-width modulation (H-PWM) technique, for a 3-level neutral point clamped (NPC) electric vehicle (EV) traction inverter drive. The proposed strategy depicts the advantages of both classic space-vector pulse width modulations (SV-PWM) as well as carrier-based PWM. The duty-cycles for the traction inverter switches are calculated using carrier-based PWM, to reduce the computational time and control complexity of the system. The redundancies of the switching states are then used to balance the 2 DC-link capacitor voltages, similar to the SV-PWM based strategy. The proposed scheme is capable of maintaining the difference between the 2 DC-link capacitor voltages for a wider range of machine speedtorque variations. Furthermore, a single carrier is used for PWM, instead of multiple carriers, which further reduces computational complexity. A detailed comparative study is carried out, to prove the performance difference between the low switching loss-based SV-PWM techniques, which is previously proposed by authors and the present proposed hybrid-PWM strategy. In addition, total harmonic distortion of voltage and current, duty-cycles of the switches, total inverter power loss as well as DC-link voltage balancing capabilities are also compared. The balancing ability of the proposed strategy by changing the neutral point potential control is also demonstrated. Detailed simulation and experimental studies are carried out to prove the performance of the proposed control strategy with a 6.0 kW, surface-mounted permanent magnet synchronous machine (SPMSM). Simulation and experimental test results prove the desired performance of the proposed scheme.