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Conference paper

Design of Current-Controller with PR-regulator for LCL-Filter Based Grid-Connected Converter

In Ieee Pedg 2010 — 2010, pp. 490-494

By Zeng, Guohong1; Rasmussen, Tonny Wederberg2,3

From

Beijing Jiaotong University1

Electric Components, Department of Electrical Engineering, Technical University of Denmark2

Department of Electrical Engineering, Technical University of Denmark3

In the application of LCL-filter based converters, the structure and parameters of current-controller is very important for the system stability and output current quality. This paper presents a filter-capacitor current feedback control scheme for grid-connected converter. The controller is consisted of a proportional-resonance regulator and a proportional regulator.

Unlike the existing control strategy with unit capacitor current feedback, the proposed method applies the proportional regulator to the feedback path, which can decouple these two regulators, and simplify the tuning process. Controller parameters are tuned with the aid of root-locus of system close-loop transfer function, which can provide better grasp of the influence of individual parameters and make the design process visible and holistic without any simplification and assumption.

The validity, reasonability and feasibility of the control strategy and the proposed current controller design method are verified by the simulation results of a 50kVA grid-connected inverter.

Language: English
Publisher: IEEE Computer Society Press
Year: 2010
Pages: 490-494
Proceedings: 2nd International Symposium on Power Electronics for Distributed Generation Systems
ISBN: 142445669X , 142445669x , 1424456703 , 1424456711 , 9781424456697 , 9781424456703 and 9781424456710
Types: Conference paper
DOI: 10.1109/PEDG.2010.5545804
ORCIDs: Rasmussen, Tonny Wederberg
Keywords

Capacitors Converters Delay effects Inverters LCL-filter PR-regulator Regulators Transfer functions Voltage control current controller electric current control feedback path filter-capacitor current feedback control grid-connected converter output current quality parameter design power convertors power filters power grids power system control proportional-resonance regulator root-locus system close-loop transfer function system stability transfer functions voltage source converter

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