A Modulation Strategy for a Three-Level Inverter Synchronous Reluctance Motor (SynRM) Drive


During this paper, two modulation methods known as Mod-one and Mod-2 are compared for a three-level diode neutral purpose-clamped (NPC) inverter synchronous reluctance machine (SynRM) drive. These modulation strategies don't operate at a fixed switching frequency. A new modulation strategy which operates at a fastened switching frequency is proposed referred to as Mod3. The SynRM suffers from a poor power issue which makes it tougher to archive capacitor voltage balancing for a three-level NPC inverter. These modulation methods are of the nearest 3 vector (NTV) family. Mod-one and Mod-three choose certain vector states to achieve capacitor voltage balancing, whereas Mod-2 strategy makes use of the inverter vector state's dwell time. The parameters of interest are the torque ripple, the neutral purpose (NP) voltage ripple, the inverter efficiency, and also the d-axis current ripple. Though lower torque ripple and better power quality are registered on Mod-2 strategy. Mod-one strategy has 14% improvement in inverter potency at lower modulation index (mi = 0.4). Mod-2 strategy has 11% more NP voltage ripple at a modulation index of 0.4. One of the disadvantages of Mod-one strategy is the varying switching frequency. Mod-three theme made higher inverter efficiency, better balancing of the capacitor voltages, and guaranteed mounted inverter switching frequency. The disadvantage with Mod-3 strategy is that it generated higher torque ripple, daxis current ripple, and current total harmonic distortion when put next to Mod-1 and Mod-2 at the same load conditions.

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