DC Component Suppression of Grid-Connected Z-Source Inverter Based on Disturbance Observer

Guofeng He (), Junfang Lin, Guojiao Li, Yanfei Dong and Wenjie Zhang
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Guofeng He: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Junfang Lin: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Guojiao Li: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Yanfei Dong: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Wenjie Zhang: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China

Energies, 2022, vol. 15, issue 15, 1-17

Abstract: Regarding the problems of resonance and direct current (DC) components when the Z-source inverter (ZSI) without an isolation transformer is connected to the grid through an LCL filter, this paper proposes a novel DC component suppression strategy for a grid-connected ZSI based on the split capacitor method of disturbance observer (DOB). The split capacitor method is utilized to convert a third-order LCL filter into a first-order one to eliminate the resonance problem. The DC component of the inverter output voltage is regarded as an external disturbance, and the employed DOB is used to observe it, which is fed forward to suppress the DC disturbance component. Various comparison results of the simulation and experiment show that the proposed control strategy can effectively reduce grid-connected DC components injected into the grid at less than 0.5%, which decreases the DC component from 1.8% to 0.1%.

Keywords: ZSI; split capacitor; disturbance observer; DC current injection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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