Predictive Control of Three-Level NPC Inverter-Fed IPMSM Drive Using g-h Coordinates for Common Mode Voltage Reduction

Common mode voltage is associated with various system issues, which include elevated leakage currents due to high dv/dt, leading to motor damage, electromagnetic interference, bearing failure, and overvoltage stress on Interior Permanent Magnet Synchronous Motor (IPMSM) winding insulation. Therefore, it is crucial to explore methods for reducing common-mode voltage to optimize drive system design. In this study, space vector modulation (SVM) strategies based on predictive control are proposed for three-level NPC pulse width modulation inverters used in drive systems. These strategies aim to effectively suppress common-mode voltage and reduce the computational burden by taking only the voltage vectors, in which only one time calculation will be done instead of 27-time calculations as done in current-based tracking. The proposed techniques are applicable to both low- and medium-voltage drive applications and have been implemented on a three-level neutral-point clamped inverter. To evaluate their performance, a comparative study has been conducted comparing them to traditional methods. By adopting this SVM based on predictive control, it is anticipated that common-mode voltage can be effectively reduced with less computational burden, and the results are verified by simulation on MATLAB.