Abstrakt

The doctoral dissertation is all about the development of the space vector modulation algorithm for controlling the generation of output voltage vectors in a three-level, five-phase NPC inverter. The developed algorithm can be used to control five-phase motors, where it will be possible to increase the motor torque by 15%; by appropriate injection of 3rd harmonic current. The proposed control approach also opens up the possibility of independent control of two electric motors, supplied from a single inverter. The critical issues that need to be solved when creating pulse-width modulation algorithms for multiphase, three-level inverters are the need to simultaneously balance the input splitting DC-link capacitor voltages and ensure correct generation of many independent voltage vectors. This scenario is also applicable to the case when the DC-link voltages are of different values. The proposed solution paves way for independent syntheses of output voltages with minimum number of active switches’ transitions; while allowing for appropriate voltage distribution on the DC-link capacitors.

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