Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/604105
Title: Highly Accurate Derivatives for LCL -Filtered Grid Converter With Capacitor Voltage Active Damping
Authors: Zhen Xin;Poh Chiang Loh;Xiongfei Wang;Frede Blaabjerg;Yi Tang
subject: digital implementation|LCL-filter|active damping|voltage-source converter|Derivative
Year: 2016
Publisher: IEEE
Abstract: The middle capacitor voltage of an LCL-filter, if fed back for synchronization, can be used for active damping. An extra sensor for measuring the capacitor current is then avoided. Relating the capacitor voltage to existing popular damping techniques designed with capacitor current feedback would however demand a noise-sensitive derivative term. Digital implementation of this derivative term is generally a challenge with many methods presently developed for resolving it. These methods are however still facing drawbacks, which have comprehensively been explained in this paper. Two derivatives are then proposed, based on either second-order or nonideal generalized integrator. Performances of these derivatives have been found to match the ideal “s” function closely. Active damping based on capacitor voltage feedback can therefore be realized accurately. Experimental results presented have verified the effectiveness of the proposed derivative, which can similarly be used with other applications, where differentiation is needed.
URI: http://localhost/handle/Hannan/138681
http://localhost/handle/Hannan/604105
ISSN: 0885-8993
1941-0107
volume: 31
issue: 5
Appears in Collections:2016

Files in This Item:
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7185440.pdf6.09 MBAdobe PDFThumbnail
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Title: Highly Accurate Derivatives for LCL -Filtered Grid Converter With Capacitor Voltage Active Damping
Authors: Zhen Xin;Poh Chiang Loh;Xiongfei Wang;Frede Blaabjerg;Yi Tang
subject: digital implementation|LCL-filter|active damping|voltage-source converter|Derivative
Year: 2016
Publisher: IEEE
Abstract: The middle capacitor voltage of an LCL-filter, if fed back for synchronization, can be used for active damping. An extra sensor for measuring the capacitor current is then avoided. Relating the capacitor voltage to existing popular damping techniques designed with capacitor current feedback would however demand a noise-sensitive derivative term. Digital implementation of this derivative term is generally a challenge with many methods presently developed for resolving it. These methods are however still facing drawbacks, which have comprehensively been explained in this paper. Two derivatives are then proposed, based on either second-order or nonideal generalized integrator. Performances of these derivatives have been found to match the ideal “s” function closely. Active damping based on capacitor voltage feedback can therefore be realized accurately. Experimental results presented have verified the effectiveness of the proposed derivative, which can similarly be used with other applications, where differentiation is needed.
URI: http://localhost/handle/Hannan/138681
http://localhost/handle/Hannan/604105
ISSN: 0885-8993
1941-0107
volume: 31
issue: 5
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7185440.pdf6.09 MBAdobe PDFThumbnail
Preview File
Title: Highly Accurate Derivatives for LCL -Filtered Grid Converter With Capacitor Voltage Active Damping
Authors: Zhen Xin;Poh Chiang Loh;Xiongfei Wang;Frede Blaabjerg;Yi Tang
subject: digital implementation|LCL-filter|active damping|voltage-source converter|Derivative
Year: 2016
Publisher: IEEE
Abstract: The middle capacitor voltage of an LCL-filter, if fed back for synchronization, can be used for active damping. An extra sensor for measuring the capacitor current is then avoided. Relating the capacitor voltage to existing popular damping techniques designed with capacitor current feedback would however demand a noise-sensitive derivative term. Digital implementation of this derivative term is generally a challenge with many methods presently developed for resolving it. These methods are however still facing drawbacks, which have comprehensively been explained in this paper. Two derivatives are then proposed, based on either second-order or nonideal generalized integrator. Performances of these derivatives have been found to match the ideal “s” function closely. Active damping based on capacitor voltage feedback can therefore be realized accurately. Experimental results presented have verified the effectiveness of the proposed derivative, which can similarly be used with other applications, where differentiation is needed.
URI: http://localhost/handle/Hannan/138681
http://localhost/handle/Hannan/604105
ISSN: 0885-8993
1941-0107
volume: 31
issue: 5
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7185440.pdf6.09 MBAdobe PDFThumbnail
Preview File