[article] 
inIEEE transactions on industrial electronics > Vol. 57 N° 6 (Juin 2010) . - pp. 2033 - 2041

Titre :	A new feedback method for PR current control of LCL-filter-based grid-connected inverter
Type de document :	texte imprimé
Auteurs :	Guoqiao, Shen, Auteur ; Xuancai, Zhu, Auteur ; Jun Zhang, Auteur
Article en page(s) :	pp. 2033 - 2041
Note générale :	Génie électrique
Langues :	Anglais (eng)
Mots-clés :	Current control Harmonic distorsion Inverters LCL filter
Index. décimale :	621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X
Résumé :	For a grid-connected converter with an LCL filter, the harmonic compensators of a proportional-resonant (PR) controller are usually limited to several low-order current harmonics due to system instability when the compensated frequency is out of the bandwidth of the system control loop. In this paper, a new current feedback method for PR current control is proposed. The weighted average value of the currents flowing through the two inductors of the LCL filter is used as the feedback to the current PR regulator. Consequently, the control system with the LCL filter is degraded from a third-order function to a first-order one. A large proportional control-loop gain can be chosen to obtain a wide control-loop bandwidth, and the system can be optimized easily for minimum current harmonic distortions, as well as system stability. The inverter system with the proposed controller is investigated and compared with those using traditional control methods. Experimental results on a 5-kW fuel-cell inverter are provided, and the new current control strategy has been verified.
DEWEY :	621.38
ISSN :	0278-0046
En ligne :	http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5406162

[article] A new feedback method for PR current control of LCL-filter-based grid-connected inverter [texte imprimé] / Guoqiao, Shen, Auteur ; Xuancai, Zhu, Auteur ; Jun Zhang, Auteur . - pp. 2033 - 2041.
Génie électrique
Langues : Anglais (eng)
in IEEE transactions on industrial electronics > Vol. 57 N° 6 (Juin 2010) . - pp. 2033 - 2041

Mots-clés :	Current control Harmonic distorsion Inverters LCL filter
Index. décimale :	621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X
Résumé :	For a grid-connected converter with an LCL filter, the harmonic compensators of a proportional-resonant (PR) controller are usually limited to several low-order current harmonics due to system instability when the compensated frequency is out of the bandwidth of the system control loop. In this paper, a new current feedback method for PR current control is proposed. The weighted average value of the currents flowing through the two inductors of the LCL filter is used as the feedback to the current PR regulator. Consequently, the control system with the LCL filter is degraded from a third-order function to a first-order one. A large proportional control-loop gain can be chosen to obtain a wide control-loop bandwidth, and the system can be optimized easily for minimum current harmonic distortions, as well as system stability. The inverter system with the proposed controller is investigated and compared with those using traditional control methods. Experimental results on a 5-kW fuel-cell inverter are provided, and the new current control strategy has been verified.
DEWEY :	621.38
ISSN :	0278-0046
En ligne :	http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5406162