Space vector pulse width modulation techniques for a five-phase impedeance source and quazi impedeance source inverters

Impedance source inverter (ZSI) and its variant quasi impedance source inverter (qZSI) are single stage inverters that transform dc to ac and boost the source voltage at the same time. These topologies have attracted great attention of researchers in recent times. This paper proposes space vector pulse width modulation (SVM) techniques to control ZSI and qZSI. The proposed SVM is equally applicable to both ZSI and qZSI. Three new methods has been developed and validated through simulation with 10 large space vectors utilization only and one method with 20 vectors (10 large and 10 medium). The technique depending on dividing the shoot through period in each control cycle into several smaller periods which produce more efficiency and less voltage stress among the five legs of the inverter. Comparison is done for gain ratio, Total harmonic distortion and dc link voltage ripple for the proposed SVM methods

Space vector pulse width modulation scheme for three to seven phase direct matrix converter

In this paper a generalized multi-phase space vector theory is considered for developing the space vector modulation of a three-phase to seven-phase direct matrix converter (DMC). The modulation is based on the control of the voltage vectors in the first d-q plane, while imposing the remaining voltage vectors in the second and the third planes (x1-y1, x 2-y2) zero. The duty cycles of the bidirectional switches are obtained using space vector modulation theory. The output to input voltage transfer ratio is obtained as 0.7694 for unity input power factor operation. The proposed matrix converter system offers full control of the input power factor, no limitation on the output frequency range and nearly sinusoidal output voltage. The proposed space vector algorithm can be fully implemented on a digital platform. The theoretical analysis is confirmed by digital simulations which is further verified using experimental implementation.Qatar National Research FundScopu