A fast current control technique for active filters with low switching frequency

Author

Allmeling, Jost ; Stemmler, Herbert

Author_Institution

Power Syst. Group, Swiss Fed. Inst. of Technol., Zurich, Switzerland

Volume

2

fYear

2001

fDate

2001

Firstpage

1125

Abstract

A dead-beat current control algorithm for a high power active filter is presented. The filter is based on a three-level voltage source inverter operating with carrier PWM. For a harmonic free measurement the VSI current would normally be sampled synchronously with the tips of the triangular carrier. Here, the current sampling is shifted in order to minimize delays in the control loop. It is shown that the VSI generated harmonics can be calculated and subtracted from the current measurement. For the asynchronous sampling a dead-beat control function is derived. The control technique has been verified by simulations and with an experimental setup of a flicker compensator

Keywords

PWM invertors; active filters; electric current control; electric current measurement; power conversion harmonics; power harmonic filters; switching circuits; VSI current; VSI generated harmonics; asynchronous sampling; carrier PWM; current measurement; current sampling; dead-beat control function; dead-beat current control algorithm; delay minimisation; flicker compensator; harmonic free measurement; high power active filter; three-level voltage source inverter; triangular carrier; Active filters; Current control; Current measurement; Delay; Power harmonic filters; Power system harmonics; Pulse width modulation; Pulse width modulation inverters; Switching frequency; Voltage fluctuations;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics Society, 2001. IECON '01. The 27th Annual Conference of the IEEE

Conference_Location

Denver, CO

Print_ISBN

0-7803-7108-9

Type

conf

DOI

10.1109/IECON.2001.975938

Filename

975938