Improved design of passive damping for single phase grid‐connected LCL filtered inverter considering impedance stability

Abstract Grid‐connected inverters with an inductor–capacitor–inductor (LCL) filter usually require the implementation of damping in the filter to suppress the resonance associated with the filter and hence ensure internal stability. The value for the damping resistor is commonly chosen as one‐third...

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Main Authors: Ramy Ali, Hamed Heydari‐doostabad, Shahab Sajedi, Terence O'Donnell
Format: Article
Language:English
Published: Wiley 2024-03-01
Series:IET Power Electronics
Subjects:
Online Access:https://doi.org/10.1049/pel2.12666
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author Ramy Ali
Hamed Heydari‐doostabad
Shahab Sajedi
Terence O'Donnell
author_facet Ramy Ali
Hamed Heydari‐doostabad
Shahab Sajedi
Terence O'Donnell
author_sort Ramy Ali
collection DOAJ
description Abstract Grid‐connected inverters with an inductor–capacitor–inductor (LCL) filter usually require the implementation of damping in the filter to suppress the resonance associated with the filter and hence ensure internal stability. The value for the damping resistor is commonly chosen as one‐third of the capacitive reactance at the resonance frequency of the LCL filter. However, this commonly‐used principle does not take into account the external stability of the inverter, i.e. the potential for an interaction between the inverter output impedance and the grid impedance. This work discusses a new design for the damping resistor to assure the external stability of the voltage source inverter as well as its internal stability. The analysis shows that the proposed design can ensure the external stability of the voltage source inverter with different grid impedances as well as robustness against the variations of the filter parameters while maintaining low power losses and an acceptable attenuation rate for high‐frequency harmonics. To validate the theoretical analysis, a 1 kW, 110 V laboratory prototype is implemented. The obtained results confirm the applicability of the proposed design approach.
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spelling doaj.art-96e1b58d86cd44e3956a277be817a9052024-03-12T11:30:28ZengWileyIET Power Electronics1755-45351755-45432024-03-0117451152310.1049/pel2.12666Improved design of passive damping for single phase grid‐connected LCL filtered inverter considering impedance stabilityRamy Ali0Hamed Heydari‐doostabad1Shahab Sajedi2Terence O'Donnell3School of Electrical and Electronic Engineering University College Dublin Dublin IrelandSchool of Electrical and Electronic Engineering University College Dublin Dublin IrelandSchool of Electrical and Electronic Engineering University College Dublin Dublin IrelandSchool of Electrical and Electronic Engineering University College Dublin Dublin IrelandAbstract Grid‐connected inverters with an inductor–capacitor–inductor (LCL) filter usually require the implementation of damping in the filter to suppress the resonance associated with the filter and hence ensure internal stability. The value for the damping resistor is commonly chosen as one‐third of the capacitive reactance at the resonance frequency of the LCL filter. However, this commonly‐used principle does not take into account the external stability of the inverter, i.e. the potential for an interaction between the inverter output impedance and the grid impedance. This work discusses a new design for the damping resistor to assure the external stability of the voltage source inverter as well as its internal stability. The analysis shows that the proposed design can ensure the external stability of the voltage source inverter with different grid impedances as well as robustness against the variations of the filter parameters while maintaining low power losses and an acceptable attenuation rate for high‐frequency harmonics. To validate the theoretical analysis, a 1 kW, 110 V laboratory prototype is implemented. The obtained results confirm the applicability of the proposed design approach.https://doi.org/10.1049/pel2.12666frequency‐domain analysisharmonicspower convertorsresonancevoltage‐source convertors
spellingShingle Ramy Ali
Hamed Heydari‐doostabad
Shahab Sajedi
Terence O'Donnell
Improved design of passive damping for single phase grid‐connected LCL filtered inverter considering impedance stability
IET Power Electronics
frequency‐domain analysis
harmonics
power convertors
resonance
voltage‐source convertors
title Improved design of passive damping for single phase grid‐connected LCL filtered inverter considering impedance stability
title_full Improved design of passive damping for single phase grid‐connected LCL filtered inverter considering impedance stability
title_fullStr Improved design of passive damping for single phase grid‐connected LCL filtered inverter considering impedance stability
title_full_unstemmed Improved design of passive damping for single phase grid‐connected LCL filtered inverter considering impedance stability
title_short Improved design of passive damping for single phase grid‐connected LCL filtered inverter considering impedance stability
title_sort improved design of passive damping for single phase grid connected lcl filtered inverter considering impedance stability
topic frequency‐domain analysis
harmonics
power convertors
resonance
voltage‐source convertors
url https://doi.org/10.1049/pel2.12666
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AT hamedheydaridoostabad improveddesignofpassivedampingforsinglephasegridconnectedlclfilteredinverterconsideringimpedancestability
AT shahabsajedi improveddesignofpassivedampingforsinglephasegridconnectedlclfilteredinverterconsideringimpedancestability
AT terenceodonnell improveddesignofpassivedampingforsinglephasegridconnectedlclfilteredinverterconsideringimpedancestability