BEGA Starter/Alternator—Vector Control Implementation and Performance for Wide Speed Range at Unity Power Factor Operation

Ion Boldea, Vasile Coroban-Schramel, Gheorghe-Daniel Andreescu, Frede Blaabjerg, Sever Scridon

Research output: Contribution to journalJournal articleResearchpeer-review

33 Citations (Scopus)
571 Downloads (Pure)

Abstract

The Biaxial Excitation Generator for Automobiles (BEGA) is proposed as a solution for integrated starter/alternator systems used in hybrid electric vehicles. This paper demonstrates through experiments and simulations that BEGA has a very large constant power speed range. A vector control structure is proposed
for BEGA operation during motoring and generating, at unity power factor with zero d-axis current (id) and zero q-axis flux (Ψq) control. In such conditions, BEGA behaves like a separately excited dc brush(commutator) machine, in the sense that no stator inductance voltage drop occurs in such constraint control conditions. A high iq current is required in order to cancel the q-axis
flux, during unity power factor operation. This engages higher copper losses in the machine under light load. In order to minimize the copper losses, for lower load levels, a current referencer is proposed. Due to higher dc field excitation time constant, the dc field current response is not very fast, particularly for high-current excursion. In order to increase the torque response quickness, the
d-axis current id is controlled with a nonzero reference value only during transients, when there is a difference between the reference and measured dc field currents. This way, high dynamic performance is secured. Implementation, digital simulation, and experimental results validate the proposed solutions.
Original languageEnglish
JournalI E E E Transactions on Industry Applications
Volume46
Issue number1
Pages (from-to)150-158
Number of pages9
ISSN0093-9994
DOIs
Publication statusPublished - 2010

Keywords

  • Biaxial Excitation Generator for Automobiles (BEGA)
  • Current referencer
  • DC excitation
  • Loss minimization
  • Starter/alternator
  • Unity power factor
  • Vector control

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