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Title: An Active Modulation Scheme to Boost Voltage Utilisation of the Dual Converter with a Floating Bridge

Journal Article · · IEEE Translations on Industrial Electronics
 [1];  [1];  [1];  [2];  [1];  [3]
  1. Univ. of Nottingham (United Kingdom). Power Electronics Machines and Control Group. Dept. of Electrical and Electronics Engineering
  2. Univ. of Nottingham (United Kingdom). Power Electronics Machines and Control Group. Dept. of Electrical and Electronics Engineering; Univ. of Nottingham Ningbo China (China)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Power Electronics and Electric Machinery Group
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This paper proposes a capacitor voltage regulation method for the dual converter with a floating bridge for aerospace applications. This topology has previously been reported, but with a constrained voltage utilisation factor due to the need for capacitor voltage regulations. The effect of switching states on the voltage variation of capacitor is quantitatively modelled and an enhanced space vector modulation scheme with current feedback is proposed to achieve an active control of the floating capacitor voltages. This proposed method also allows further exploitation and utilisation of converter voltage. The relationship between the allowed modulation index of dual converter and load power factor is obtained and expressed using a fitted polynomial equation. The advantages of the proposed method include boosted voltage utilisation and superior performance in term of capacitor voltage balance. These advantages have been proven through simulation and experimental results on RL loads as well as with an open-end winding induction motor. The proposed modulation scheme can boost the converter voltage utilisation by at least 10% while achieving full four-level operation. More importantly, the higher available voltage allows extending the constant torque region of the motor, the further beginning of field weakening operation could be postponed.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Nottingham (United Kingdom)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1479727
Journal Information:
IEEE Translations on Industrial Electronics, Vol. 66, Issue 7; ISSN 0278-0046
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

Figures / Tables (21)

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Related Subjects

42 ENGINEERING
dual converter
more electric aircraft
multilevel converters
space vector modulation
voltage regulation