Abstract

This paper presents a closed loop space vector pulse width modulation (SVPWM) based dc bus voltage balancing algorithm for a three-level neutral-point-clamped (3L-NPC) inverter fed induction motor drive. Broad range of accurate speed and torque control is achieved using rotor field-oriented control (RFOC). Switching sequences for the NPC inverter are designed based on the degree of dc-link voltage unbalance and dc-link current to achieve dc-link capacitor voltage balancing under various load conditions. The algorithm is effective for both motoring and regenerative braking modes, which is the most adequate requirement for electric vehicle application. The redundant switching states in small voltage space vectors are utilized to enhance the harmonic performance of the inverter and capacitor voltage balancing. Performance of the 3L-NPC fed induction motor drive is studied in MATLAB/SIMULINK platform.

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