Permanent Magnet Synchronous Condenser with Solid State Excitation

Eduard Muljadi, Ping Hsu, Ziping Wu, Wenzhong Gao

Research output: Contribution to conferencePaper

1 Scopus Citations


A synchronous condenser consists of a free-spinning wound-field synchronous generator and a field excitation controller. In this paper, we propose a synchronous generator that employs a permanent magnet synchronous generator (PMSG) instead of a wound-field machine. PMSGs have the advantages of higher efficiency and reliability. In the proposed configuration, the reactive power control is achieved by a voltage source converter connected in series with the PMSG and the grid. The converter varies the phase voltage of the PMSG so as to create the same effect of over or under excitation in a wound-field machine. The converter output voltage level controls the amount and the direction of the produced reactive power and the voltage's phase is kept in-phase with the grid voltage except a slight phase can be introduced so that some power can be drawn from the grid for maintaining the DC bus voltage level of the converter. Since the output voltage of the converter is only a fraction of the line voltage, its VA rating is only a fraction of the rating of the PMSG. The proposed scheme is shown to be effective by computer simulation.
Original languageAmerican English
Number of pages5
StatePublished - 2015
Event2015 IEEE Power and Energy Society General Meeting - Denver, Colorado
Duration: 26 Jul 201530 Jul 2015


Conference2015 IEEE Power and Energy Society General Meeting
CityDenver, Colorado

Bibliographical note

See NREL/CP-5D00-63735 for preprint

NREL Publication Number

  • NREL/CP-5D00-67152


  • damping
  • permanent magnets
  • reactive power
  • renewable energy sources
  • static VAr compensators
  • synchronous generators
  • voltage control


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