Precision State Space Resonant Filter Structures for Digital Fixed-Point Converter Control Systems

McGrath, B, Teixeira, C and Holmes, D 2018, 'Precision State Space Resonant Filter Structures for Digital Fixed-Point Converter Control Systems', in Proceedings of the 10th Annual IEEE Energy Conversion Congress and Exposition (ECCE 2018), Portland, Oregon, United States, 23-27 September 2018, pp. 5286-5293.


Document type: Conference Paper
Collection: Conference Papers

Title Precision State Space Resonant Filter Structures for Digital Fixed-Point Converter Control Systems
Author(s) McGrath, B
Teixeira, C
Holmes, D
Year 2018
Conference name ECCE 2018
Conference location Portland, Oregon, United States
Conference dates 23-27 September 2018
Proceedings title Proceedings of the 10th Annual IEEE Energy Conversion Congress and Exposition (ECCE 2018)
Publisher IEEE
Place of publication United States
Start page 5286
End page 5293
Total pages 8
Abstract Stationary frame converter control systems routinely use resonant filters because they produce infinite loop gain at resonance, which is critical to enable the elimination of steady state tracking errors at the desired AC frequency. However, digital resonant filters are susceptible to discretisation and coefficient rounding errors when implemented using fixed-point arithmetic. This paper investigates the fixed-point realisation of discrete state space resonant filters for zero-order hold (ZOH), first-order hold (FOH) and Tustin with pre-warping discrete formulations. Both shift-operator and delta-operator implementations are presented, to show how the state space structure offers significant benefits in terms of accuracy and the coefficient number range for a given bit resolution. The theoretical findings are supported by frequency domain analysis, simulation and experimental results.
Subjects Industrial Electronics
Keyword(s) Proportional resonant (PR) control
discretisation
delta-operator
state space current control
DOI - identifier 10.1109/ECCE.2018.8558385
Copyright notice © 2018 IEEE
ISBN 9781479973125
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