Abstract
AbstractIn this paper, the analysis and calculation method of a Z-Source inverter (ZSI) capacitor current and voltage ripples for the SVPWM strategy are presented. By analysing the relationship between the capacitor, inductor and DC-link current in the shoot-through and non-shoot-through states, the analytical expression of the RMS value of a capacitor is derived. The RMS value is determined from the modulation index using the output power, output current and power factor angle. The capacitor voltage ripple under the SVPWM control varies with the change in the voltage vector angle, and it has a maximum value in a carrier period. The expression of the capacitor voltage ripple is different in different shoot-through state ranges. In this paper, the capacitor voltage ripple is deduced for ZSI under SVM4 modulation. In order to verify the effectiveness of the proposed calculation method, a ZSI prototype are implemented. The capacitor RMS current and voltage ripples are measured in different shoot-through states, modulation indexes and power factors.KeywordsZ-Source inverterCapacitorSVPWMRMS currentVoltage ripple
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