A novel three-level hysteresis current regulation strategy for three-phase three-level inverters

Davoodnezhad, R, Holmes, G and McGrath, B 2014, 'A novel three-level hysteresis current regulation strategy for three-phase three-level inverters', IEEE Transactions on Power Electronics, vol. 29, no. 11, pp. 6100-6109.


Document type: Journal Article
Collection: Journal Articles

Title A novel three-level hysteresis current regulation strategy for three-phase three-level inverters
Author(s) Davoodnezhad, R
Holmes, G
McGrath, B
Year 2014
Journal name IEEE Transactions on Power Electronics
Volume number 29
Issue number 11
Start page 6100
End page 6109
Total pages 10
Publisher IEEE
Abstract This paper presents a new hysteresis current regulation strategy for the neutral point clamped and flying capacitor (FC) three-level inverters. The strategy uses the measured average of the switched phase leg output voltage to adjust the controller hysteresis band as the load back EMF varies to maintain a near constant phase leg switching frequency. The phase leg switchings are then fine tuned to a fixed frequency clock to further improve frequency regulation. Next, the zero-crossings of the measured phase leg average voltages are used to select between positive and negative switched output voltage levels, so that only one hysteresis current regulator is required for the full inverter switched output voltage range. For the FC inverter, a state machine is then added to select between redundant switching states to maintain balanced capacitor voltages. Finally, the controller is extended to a three-phase system by subtracting the common mode interacting current from the total phase leg current error before making any switching decision. The resulting controller achieves a line-to-line harmonic performance that is very close to open-loop phase disposition pulse width modulation, while retaining all of the dynamic benefits of hysteresis current regulation.
Subject Power and Energy Systems Engineering (excl. Renewable Power)
Keyword(s) Multilevel hysteresis control
nonlinear current control
three-level hysteresis current regulation
variable band
Copyright notice © 2013 IEEE
ISSN 0885-8993
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