Scheduled System Maintenance:
On May 6th, single article purchases and IEEE account management will be unavailable from 8:00 AM - 12:00 PM ET (12:00 - 16:00 UTC). We apologize for the inconvenience.
By Topic

Online grid-adaptive control and active-filter functionality of PWM-converters to mitigate voltage-unbalances and voltage-harmonics - a control concept based on grid-impedance measurement

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Hoffmann, N. ; Inst. for Power Electron. & Electr. Drives, Christian-Albrechts-Univ. of Kiel, Kiel, Germany ; Fuchs, F.W. ; Asiminoaei, L.

This work presents a control concept for a PWM-converter switching with medium-low frequencies (2.5 kHz) based on grid-impedance measurement to adapt the converters control online to variable grid-conditions and to improve the voltage-quality at the converters connection point. Thus, this work contributes to the actual problem of connecting distributed renewable energy sources to the grid. To improve the voltage-quality, additional active-filter functionality is implemented to mitigate unbalances and harmonics (5th and 7th). To meet these control objectives with medium-low switching-frequencies, and thus with medium-low control-frequencies (5 kHz), the control-design is done using discrete time-domain analysis. The theoretical approaches are verified in experiments on a 22 kVA laboratory setup composed of a voltage-source back-to-back converter connected with an LCL-filter to the mains, an interior permanent-magnet synchronous-machine and a grid-impedance analyzer. The results reveal that stable converter operation is reached over a wide range of grid-impedances and that it is possible to improve the voltage-quality with the additional active-filter functionality adapting the measured grid-impedance for the control.

Published in:

Energy Conversion Congress and Exposition (ECCE), 2011 IEEE

Date of Conference:

17-22 Sept. 2011