A Generalized Space Vector Classification Technique for Six-Phase Inverters

Abstract

A generalized space vector PWM control for six- phase voltage source inverters is presented in this paper. The proposed approach utilizes three-phase Space Vector Modulators (SVM) technique does not generate the 5th, 7th, 17th, 19th, ... harmonic currents inherently generated by conventional six- phase space vector modulations. The proposed technique takes advantage of a modified Kohonen's competitive layer to identify the switching vectors and calculate their duty cycles. By using this technique: a) the hardware and software complexity of the system is reduced, b) the maximum attainable switching frequency and thus the bandwidth of the control system is increased, and c) the waveform degradation and parasitic harmonics resulting from inaccurate calculations are avoided. The proposed method is compared to the conventional SVM techniques in terms of hardware/software requirements, switching frequency, computation time, and harmonic spectra. Both feed-forward (V/f control), and feedback (vector control) schemes are addressed. Simulation results provided verify the validity of the proposed scheme.