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Performance analysis of adaptive notch filter active damping methods for grid-connected converters under a varying grid impedance

Lookup NU author(s): Dr Nabila Rufa'IORCiD

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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.


Publication metadata

Author(s): Rufa'I NA, Zhang L, Chong B

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 12th IEEE PES Powertech Conference

Year of Conference: 2017

Online publication date: 20/07/2017

Acceptance date: 03/04/2017

Publisher: IEEE

URL: https://doi.org/10.1109/PTC.2017.7981203

DOI: 10.1109/PTC.2017.7981203

Library holdings: Search Newcastle University Library for this item

ISBN: 9781509042371


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