Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/658102
Title: Effect of State Feedback Coupling and System Delays on the Transient Performance of Stand-Alone VSI With LC Output Filter
Authors: Federico de Bosio;Luiz Antonio de Souza Ribeiro;Francisco D. Freijedo;Michele Pastorelli;Josep M. Guerrero
subject: microgrids|current control|voltage control|power quality|Control system analysis
Year: 2016
Publisher: IEEE
Abstract: The influence of state feedback coupling in the dynamics performance of power converters for stand-alone microgrids is investigated. Computation and pulsewidth-modulated (PWM) delays are the main factors that limit the achievable bandwidth of current regulators in digital implementations. In particular, the performance of state feedback decoupling is degraded because of these delays. Two decoupling techniques to improve the transient response of the system are investigated, named nonideal and ideal capacitor voltage decoupling, respectively. In particular, the latter solution consists in leading the capacitor voltage on the state feedback decoupling path in order to compensate for system delays. Practical implementation issues are discussed with reference to both the decoupling techniques. A design methodology for the voltage loop that considers the closed-loop transfer functions developed for the inner loop is also provided. A proportional resonant voltage controller is designed according to Nyquist criterion taking into account application requirements. For this purpose, a mathematical expression based on root locus analysis is proposed to find the minimum value of the fundamental resonant gain. Experimental tests performed in accordance to UPS standards verify the theoretical analysis.
URI: http://localhost/handle/Hannan/170155
http://localhost/handle/Hannan/658102
ISSN: 0278-0046
1557-9948
volume: 63
issue: 8
Appears in Collections:2016

Files in This Item:
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Title: Effect of State Feedback Coupling and System Delays on the Transient Performance of Stand-Alone VSI With LC Output Filter
Authors: Federico de Bosio;Luiz Antonio de Souza Ribeiro;Francisco D. Freijedo;Michele Pastorelli;Josep M. Guerrero
subject: microgrids|current control|voltage control|power quality|Control system analysis
Year: 2016
Publisher: IEEE
Abstract: The influence of state feedback coupling in the dynamics performance of power converters for stand-alone microgrids is investigated. Computation and pulsewidth-modulated (PWM) delays are the main factors that limit the achievable bandwidth of current regulators in digital implementations. In particular, the performance of state feedback decoupling is degraded because of these delays. Two decoupling techniques to improve the transient response of the system are investigated, named nonideal and ideal capacitor voltage decoupling, respectively. In particular, the latter solution consists in leading the capacitor voltage on the state feedback decoupling path in order to compensate for system delays. Practical implementation issues are discussed with reference to both the decoupling techniques. A design methodology for the voltage loop that considers the closed-loop transfer functions developed for the inner loop is also provided. A proportional resonant voltage controller is designed according to Nyquist criterion taking into account application requirements. For this purpose, a mathematical expression based on root locus analysis is proposed to find the minimum value of the fundamental resonant gain. Experimental tests performed in accordance to UPS standards verify the theoretical analysis.
URI: http://localhost/handle/Hannan/170155
http://localhost/handle/Hannan/658102
ISSN: 0278-0046
1557-9948
volume: 63
issue: 8
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7446308.pdf2.7 MBAdobe PDFThumbnail
Preview File
Title: Effect of State Feedback Coupling and System Delays on the Transient Performance of Stand-Alone VSI With LC Output Filter
Authors: Federico de Bosio;Luiz Antonio de Souza Ribeiro;Francisco D. Freijedo;Michele Pastorelli;Josep M. Guerrero
subject: microgrids|current control|voltage control|power quality|Control system analysis
Year: 2016
Publisher: IEEE
Abstract: The influence of state feedback coupling in the dynamics performance of power converters for stand-alone microgrids is investigated. Computation and pulsewidth-modulated (PWM) delays are the main factors that limit the achievable bandwidth of current regulators in digital implementations. In particular, the performance of state feedback decoupling is degraded because of these delays. Two decoupling techniques to improve the transient response of the system are investigated, named nonideal and ideal capacitor voltage decoupling, respectively. In particular, the latter solution consists in leading the capacitor voltage on the state feedback decoupling path in order to compensate for system delays. Practical implementation issues are discussed with reference to both the decoupling techniques. A design methodology for the voltage loop that considers the closed-loop transfer functions developed for the inner loop is also provided. A proportional resonant voltage controller is designed according to Nyquist criterion taking into account application requirements. For this purpose, a mathematical expression based on root locus analysis is proposed to find the minimum value of the fundamental resonant gain. Experimental tests performed in accordance to UPS standards verify the theoretical analysis.
URI: http://localhost/handle/Hannan/170155
http://localhost/handle/Hannan/658102
ISSN: 0278-0046
1557-9948
volume: 63
issue: 8
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7446308.pdf2.7 MBAdobe PDFThumbnail
Preview File