A new three-dimensional space vector modulation for multilevel four-leg converters based on the shape functions of tetrahedral element

The paper proposes a new three-dimensional space vector pulse-width modulation (3D-SVPWM) algorithm for multilevel four-leg converters. The proposed PWM duty cycle calculation is based on the shape functions of the three-dimensional tetrahedral finite elements. The algorithm ensures synthesis of accurate and undistorted output voltages even under significant imbalance or ripple in the DC-link voltages. At the same time, the algorithm has the ability to eliminate the possible imbalance in the DC-link voltages.