A comprehensive study of space vector pulse‐width modulation technique for three‐phase Z‐source inverters

Abstract

The space vector pulse width modulation (SVPWM) technique has received much attention for three-phase Z-source inverters (ZSIs). The differences and connections between the SVPWM technique for ZSIs and for traditional voltage source inverters have been discussed as well. By selecting different null state and shootthrough state, three switching patterns with different switching numbers have been studied, and the harmonic spectrums of these three patterns are demonstrated. In this paper, the solutions of maximum boost control and constant boost control methods using SVPWM techniques with less switching actions have been proposed and compared with the carrier-based strategies. Selected experimental results have been provided to validate the theoretical analysis. This work will be beneficial for understanding the SVPWM concept and modulation techniques of the three-phase ZSIs.has not adopted any of the previously mentioned shoot-through states, and thus the switching actions are the same as traditional VSIs.According to Table I, T 0 = T 00 + T 07 , where T 00 and T 07 denote the switching time of null vectors V 0 and V 7 , respectively. In this section, the selection of different null states is discussed, which results in three different switching patterns.Pattern I Pattern I applies the two null vectors V 0 and V 7 in each switching cycle, and T 0 equals to T 00 = T 07 = 0.5T 0 . The appropriate shoot-through states are carefully selected according to Figure 5 Figure 6. Switching signals of space vector pulse width modulation in sector I: (a) pattern I; (b) pattern II; and (c) pattern III.Figure 13. Harmonic spectrums of output voltages: (a) pattern I; (b) pattern II; and (c) pattern III.Figure 14. Experiment results of space vector pulse width modulation-based maximum boost control: (a) gating signals of phase a; (b) enlarged waveforms in two switching cycles; (c) V C and V dc ; and (d) V pn and V ab . Subtitle of Figure 14(a): CH1:S a (10 V/div); CH2:S a ′ (10 V/div). Subtitle of Figure 14(b): CH1: S a (5 V/div); CH2:S a ′ (5 V/div). Subtitle of Figure 14(c): CH1: V C (50 V/div); CH2:V dc (50 V/div). Subtitle of Figure 14(d): CH1:V pn (100 V/div); CH2:V ab (100 V/div).

Design and analysis of a simple predictive power controller for a 1.0‐kV single‐phase NPC PWM rectifier

“…3,[32][33][34] This technique is also introduced for single-phase multi-level power converters. 3,[32][33][34] This technique is also introduced for single-phase multi-level power converters.…”

A novel switching boost inverter applied to photovoltaic power generation system

“…3 However, it increases system cost and brings some problems, such as low efficiency. 6,7 The system allows shoot-through operation for the inverter, and the duty ratio is always limited to 0.5 for achieving the positive voltage. The dead time results in distortion of output current and low utilization of the system voltage.…”

A novel modulation technique with interleaved‐and‐shifted shoot‐through state placement for quasi‐Z‐source inverters

“…The second is the improvement in modeling and modulation control methods to achieve higher performance, reliability and efficiency, or more usable shoot-through range to reach a greater boost ratio. On the other hand, the space-vector PWM control has been modified to be suitable for the qZSI [36][37][38][39][40] owing to the advantages of low current harmonics and high voltage utilization. Then, a 2-stage control method for both output voltage control and current control modes, based on the dynamical model, has been proved.…”