Developments in Voltage Regulation of Variable-Speed PM Synchronous Alternators in Automotive Electric Systems

Ovacık L., Bilgin B.

International Conference on Applied Electronics, Pilsen, Czech Republic, 7 - 08 September 2011 identifier

  • Publication Type: Conference Paper / Full Text
  • City: Pilsen
  • Country: Czech Republic
  • Istanbul Technical University Affiliated: Yes


This paper evaluates the performance of a voltage regulator for a high-efficiency, high-energy density alternator system that comprises of a PM synchronous generator and a swithced-mode rectifier. A closed-loop control system is designed to regulate the output dc voltage of the alternator system operated under varying engine speeds, electrical loads, and battery state-of-charge conditions. The open-loop transfer function of the overall power system has been derived by combining the transfer functions of the alternator, switched-mode rectifier, battery, and system loads. The variation of pole-zero locations of the open-loop transfer function with the battery state-of-charge level has been investigated. It is shown that the dominant pole effecting the stability of the voltage regulation is determined by the battery transfer function.