Grid-Current Control With Inverter-Current Feedback Active Damping for LCL Grid-Connected Inverter

The inverter-current proportional feedback (ICPF) active damping (AD) for an LCL grid-connected inverter (LCL-GCI) suffers from adverse gain reduction and loss of inductive ability in the low-frequency zone, making it unsuitable for active damping. To overcome the limitations of ICPF-AD, inverter-cu...

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Bibliographic Details
Published inIEEE transactions on industry applications Vol. 60; no. 1; pp. 1 - 11
Main Authors Upadhyay, Nitin, Padhy, Narayana Prasad, Agarwal, Pramod
Format Journal Article
LanguageEnglish
Published New York IEEE 01.01.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Active control
Active damping
Band-pass filters
Bandpass filters
Control systems
Controllers
Damping
Digital filters
dual-loop grid-current control
Dynamic response
Feedback
grid-connected inverter
Inverters
LCL filter
Power harmonic filters
Pulse width modulation
Resonance
Resonant frequency
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Summary:The inverter-current proportional feedback (ICPF) active damping (AD) for an LCL grid-connected inverter (LCL-GCI) suffers from adverse gain reduction and loss of inductive ability in the low-frequency zone, making it unsuitable for active damping. To overcome the limitations of ICPF-AD, inverter-current bandpass filter feedback (ICBFF) AD is more conducive to suppressing the resonance of LCL-GCI. However, it is found that the system time delay constrains the damping capability of ICBFF-AD to resonance frequencies lower than those achievable with ICPF-AD. Therefore, this article proposes a second-order lead filter (SOLF) in cascade with the bandpass filter (BF) as an AD controller for inverter-current feedback AD. The analysis illustrates that cascading a SOLF with BF in the AD loop preserves the LCL filter's low-frequency gain and inductive nature resulting in improved dynamic response as compared to the ICPF-AD. Additionally, the cascaded filter AD allows the damping of higher resonance frequency with better noise immunity. The design approach for BF and SOLF is proposed and the effectiveness of the cascaded AD controller in the presence of different grid impedance is presented. The experimental results from a 10 kW laboratory setup corroborate the theoretical analysis.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2023.3316997