Abstract
This article presents a modified sinusoidal pulse-width modulation (SPWM) scheme for a five-phase, three-level neutral-point-clamped inverter. The modulation scheme deploys a modified min–max function to inject the zero-sequence components into the reference modulating signals; hence enabling the effective utilization of the DC-link voltage. Balanced split-input DC-link voltages were achieved through further incorporation of adjustable voltage-dependent variables into the reference signals. The dynamic performance of the control approach is demonstrated through simulations and experiments on a laboratory inverter prototype; the results are well presented.
Highlights
In recent times, the global search for environmental friendly energy sources has demanded the use of appropriate harvesting devices to fully tap these renewable energy sources
There is unceasing demand for high power density and reliability in various industrial drive systems. These demands can be met with the concepts of multilevel converters for power electronics and multiphase systems in electric power systems
Multiphase power inverters are becoming increasingly popular in the drive systems of power electronics
Summary
The global search for environmental friendly energy sources has demanded the use of appropriate harvesting devices to fully tap these renewable energy sources. Except for the CHB MLI, the most commonly used and popular fundamental MLI configurations have been limited to the syntheses of three-level output voltages due to the innate operational imbalance in the constituting capacitor banks’ voltages and associated complex control [9,10]. These three-level inverter configurations have attained industrial maturity and have been made commercially available over recent years. The SPWM modulation approach is developed for firm control and utilization of the two DC-link capacitor voltages of a five-phase, three-level NPC inverter. The modulation scheme, DC-link capacitor voltage balancing, and simulation and experimental results are presented
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