A three-level self-synchronizing hysteresis current regulator with constant switching frequency

Davoodnezhad, R, Holmes, G and McGrath, B 2013, 'A three-level self-synchronizing hysteresis current regulator with constant switching frequency', in Grahame Holmes (ed.) Proceedings of the 5th IEEE Annual International Energy Conversion Congress and Exhibition, IEEE ECCE Asia, Melbourne, Australia, 3-6 June 2013, pp. 38-44.


Document type: Conference Paper
Collection: Conference Papers

Title A three-level self-synchronizing hysteresis current regulator with constant switching frequency
Author(s) Davoodnezhad, R
Holmes, G
McGrath, B
Year 2013
Conference name 2013 IEEE ECCE Asia Downunder
Conference location Melbourne, Australia
Conference dates 3-6 June 2013
Proceedings title Proceedings of the 5th IEEE Annual International Energy Conversion Congress and Exhibition, IEEE ECCE Asia
Editor(s) Grahame Holmes
Publisher IEEE
Place of publication United States
Start page 38
End page 44
Total pages 7
Abstract While hysteresis current control offers the benefits of a fast dynamic response and inherent overcurrent protection, its variable switching frequency and inherent two­ level switching response make it unsuitable for many applications. This paper presents a new approach for three­ level hysteresis control of a single phase grid-connected inverter that overcomes these limitations. The strategy adjusts the hysteresis band magnitude in response to variations in the inverter average output voltage, to achieve constant switching frequency using only one hysteresis comparator and without requiring DC offset compensation or current error zero­ crossing measurement. The inverter average voltage is also used to estimate the phase of the incoming grid voltage, to create a current reference for the regulator at any required power factor. The result is a robust sensorless hysteresis current regulator suitable for three-level grid connected applications that operates with a constant switching frequency.
Subjects Industrial Electronics
Power and Energy Systems Engineering (excl. Renewable Power)
Keyword(s) three-level hysteresis
sensorless synchronization
multilevel hysteresis
grid connected inverter
DOI - identifier 10.1109/ECCE-Asia.2013.6579071
Copyright notice © 2013 IEEE
ISBN 9781479904822
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