LAPSE:2023.11120
Published Article
LAPSE:2023.11120
DC Component Suppression of Grid-Connected Z-Source Inverter Based on Disturbance Observer
February 27, 2023
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%.
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%.
Record ID
Keywords
DC current injection, disturbance observer, split capacitor, ZSI
Subject
Suggested Citation
He G, Lin J, Li G, Dong Y, Zhang W. DC Component Suppression of Grid-Connected Z-Source Inverter Based on Disturbance Observer. (2023). LAPSE:2023.11120
Author Affiliations
He G: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China; College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
Lin J: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China; College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
Li G: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China; College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
Dong Y: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China; College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
Zhang W: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Lin J: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China; College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
Li G: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China; College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
Dong Y: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China; College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
Zhang W: School of Electrical and Control Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
Journal Name
Energies
Volume
15
Issue
15
First Page
5700
Year
2022
Publication Date
2022-08-05
ISSN
1996-1073
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Original Submission
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PII: en15155700, Publication Type: Journal Article
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LAPSE:2023.11120
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https://doi.org/10.3390/en15155700
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Feb 27, 2023
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