Sensorless operation of an Active Front End converter with LCL filter

Author

Wrona, Grzegorz ; Malon, Krzysztof

Author_Institution

Inst. of Control & Ind. Electron., Warsaw Univ. of Technol., Warsaw, Poland

fYear

2014

fDate

1-4 June 2014

Firstpage

2697

Lastpage

2702

Abstract

In this paper sensorless control method fora an Active Front End (AFE) converter is presented. Developed algorithm is based on Voltage Oriented Control (VOC), extended by additional Voltage Dips Compensation (VDC) module. Moreover improved Virtual Flux (VF) estimator based on SOGI-QSG for LCL filter has been shown. This new sensorless control method can assure sinusoidal and balanced grid currents even during strong voltage dips. To avoid large current overshoots, new universal startup procedure has been developed. Operation relies on turning the zero vector on for a short time and measuring the currents growth. This allows to synchronize and soft starts with and without load connection at any grid voltage condition. Simulation and laboratory results illustrate operation of the developed control method in steady states and transients.

Keywords

power grids; power harmonic filters; power supply quality; sensorless machine control; voltage control; LCL filter; SOGI-QSG; active front end converter; balanced grid currents; grid voltage condition; large current overshoots; load connection; sensorless control method; sensorless operation; sinusoidal grid currents; soft starts; universal startup procedure; virtual flux estimator; voltage dips compensation module; voltage oriented control; zero vector; Current measurement; Sensors; Synchronization; Vectors; Voltage control; Voltage fluctuations; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics (ISIE), 2014 IEEE 23rd International Symposium on

Conference_Location

Istanbul

Type

conf

DOI

10.1109/ISIE.2014.6865047

Filename

6865047