Hybrid Active Damping Combining Capacitor Current Feedback and Point of Common Coupling Voltage Feedforward for LCL-Type Grid-Connected Inverter

Both the capacitor-current-feedback (CCF) active damping and the point of common coupling (PCC) voltage feedforward can provide damping for the LCL -type grid-connected inverter. They are usually individually adopted, and negative damping will occur in a certain frequency range due to the digital co...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2021-02, Vol.36 (2), p.2373-2383
Main Authors: He, Yuying, Wang, Xuehua, Ruan, Xinbo, Pan, Donghua, Qin, Kuang
Format: Article
Language:English
Subjects:
Active damping
Capacitor-current-feedback (CCF) active damping
Capacitors
Coupling
Damping
Electric potential
Feedback
Feedforward systems
Frequency ranges
grid impedance
Impedance
Integrated circuits
Inverters
positive damping
Power harmonic filters
Resonant frequency
robustness
unit point of common coupling (PCC) voltage feedforward
Voltage
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Summary:Both the capacitor-current-feedback (CCF) active damping and the point of common coupling (PCC) voltage feedforward can provide damping for the LCL -type grid-connected inverter. They are usually individually adopted, and negative damping will occur in a certain frequency range due to the digital control delay, leading to a nonminimum phase behavior. In this article, a hybrid active damping that combines the CCF and unit PCC voltage feedforward is studied. With properly designing the CCF gain, the positive damping range could sweep the entire frequency range with the variation of grid impedance. As a reward, the maximum profit of damping cooperation can be harvested, ensuring high robustness against both grid impedance variation and filter parameter fluctuation. The simulation and experimental results are provided to verify the effectiveness of the hybrid active damping.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2020.3008160