Interactions within heterogeneous systems of uncontrolled rectifiers for aircraft electrical power systems

A. Baghramian, Andrew M. Cross, A. Forsyth

Research output: Contribution to journalArticlepeer-review


There is an increase in the use of multi-pulse, rectifier-fed motor-drive equipment on board more-electric aircraft. Motor drives with feedback control appear as constant power loads to the rectifiers, which can cause instability of the DC filter capacitor voltage at the output of the rectifier. This problem can be exacerbated by interactions between rectifiers that share a common source impedance. In order that such a system can be analysed, there is a need for average, dynamic models of systems of rectifiers. In this study, an efficient, compact method for deriving the approximate, linear, large-signal, average models of two heterogeneous systems of rectifiers, which are fed from a common source impedance, is presented. The models give insight into significant interaction effects that occur between the converters, and that arise through the shared source impedance. First, a 6-pulse and doubly wound, transformer-fed, 12-pulse rectifier system is considered, followed by a 6-pulse and autotransformer-fed, 12-pulse rectifier system. The system models are validated against detailed simulations and laboratory prototypes, and key characteristics of the two system types are compared.
Original languageEnglish
Pages (from-to)49-60
Number of pages12
JournalIET Electrical Systems in Transportation
Issue number1
Publication statusPublished - Mar 2011


  • 6-pulse and autotransformer-fed 12-pulse rectifier system
  • DC filter capacitor voltage
  • aircraft electrical power systems
  • common source impedance
  • constant power loads
  • dynamic models
  • electric aircraft
  • feedback control
  • heterogeneous systems
  • interaction effects
  • multipulse rectifier-fed motor-drive equipment
  • uncontrolled rectifiers


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