Grid-Connected Inverter Output Impedance Reshaping for Passivity Enhancement and Disturbance Rejection

To improve both the stability and the disturbance suppression ability of single-phase grid-connected inverters through LCL filters, this paper proposes an inverter output impedance enhancing control mechanism. The impedance enhancing control mechanism employs a virtual impedance control and a node-v...

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Bibliographic Details
Published in:IEEE access 2021, Vol.9, p.118334-118345
Main Authors: Bian, Zhiwei, Peng, Yuqi, He, Yuanbin, Hang, Lijun, Xie, Xiaogao, Chung, Henry Shu-Hung
Format: Article
Language:English
Subjects:
Converters
Electric potential
Feedforward control
Frequency ranges
Harmonic analysis
Impedance
impedance enhancement
Inverters
Passivity
Power harmonic filters
Power system stability
stability
Stability criteria
Voltage
Voltage control
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Summary:To improve both the stability and the disturbance suppression ability of single-phase grid-connected inverters through LCL filters, this paper proposes an inverter output impedance enhancing control mechanism. The impedance enhancing control mechanism employs a virtual impedance control and a node-voltage feedforward control to ensure sufficient passivity and high amplitude of inverter output impedance over wide frequency range of interest. The proposed control mechanism is realized through combination control of a low-voltage bidirectional voltage-source-converter (B-VSC) connected at the filter capacitor branch and the main inverter. The B-VSC sustains an extra low power without sacrificing the efficiency of the inverter. Both the simulation and experimental results are finally given to verify the validity of the proposed method, which shows the performance improvement of the proposed radial-line inverter system working under variable grid conditions.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2021.3106332