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).
The space vector pulse-width-modulation technique is extensively applied in the three-phase power electronics circuits because of its easy digital implementation and wide linear modulation range features. However, the attempt of this technique for the single-phase Z-source inverter has seldom been reported because of its unique topology and operational characteristics. In this paper, based on an in-depth mathematical derivation and theoretical explanation, the space vector pulse-width-modulation principles have been discussed in detail. Various implementation schemes are demonstrated, and a comparison study for selected switching patterns is conducted. In addition, the theoretical analysis is validated by both the simulation and experimental results. This work will be helpful for understanding the space vector pulse-width-modulation concept and modulation techniques of the single-phase full-bridge Z-source inverters. Figure 2. Single-phase full-bridge Z-source inverter. (a) Typical topology; (b) equivalent circuit in shootthrough state; (c) equivalent circuit in non-shoot-through state. 376 K. YU ET AL.
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