Rufa'I, NA, Zhang, L and Chong, B (2017) Performance Analysis of Adaptive Notch Filter Active Damping Methods for Grid-Connected Converters under a Varying Grid Impedance. In: 2017 IEEE Manchester PowerTech. 12th IEEE PES PowerTech Conference, 18-22 Jun 2017, Manchester, UK. IEEE ISBN 978-1-5090-4237-1
Abstract
Grid connected converters commonly use LCL filters for harmonic content suppression. However, associated with such filters is a resonant frequency at which the gain value increases significantly. To mitigate this problem, a notch filter is introduced into the current control loop of the converter. When tuned to the LCL resonant frequency, it introduces an opposing notch, thereby neutralizing the resonance effect. To ensure robustness of the control system, the notch filter must be made adaptive. This will ensure any variation in the resonant frequency, either due to a change in grid impedance or aging of components, can be tracked accurately. This paper provides two novel methods of online tuning for the adaptive notch filter using grid impedance estimation and discrete Fourier transform (DFT) techniques. Simulation results show that both methods are capable of fast and accurate detection of the resonant frequency, for varying strengths of the grid.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2017, IEEE. This is an author produced version of a paper published in 2017 IEEE Manchester PowerTech. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | active damping, adaptive notch filter, DFT, grid impedance estimation; Resonant frequency, Notch filters, Power harmonic filters, Discrete Fourier transforms, Impedance, Damping, Active filters |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Institute of Communication & Power Networks (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 12 Jun 2017 12:49 |
Last Modified: | 12 Sep 2017 02:35 |
Status: | Published |
Publisher: | IEEE |
Identification Number: | 10.1109/PTC.2017.7981203 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:117544 |