Impact of the switching frequency on the DC-side admittance in three-phase converter systems

Jussi Koppinen, Marko Hinkkanen

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

5 Citations (Scopus)


Three-phase converter systems can be prone to negative impedance instability of the DC-bus. This paper studies the dynamic interactions between the DC- and AC-sides of a current-controlled three-phase system in order to reveal possible risks of instability. The system is modelled by using a small-signal method from a viewpoint of the DC-side. Time delays due to pre-calculation and discretization are considered. The stability analyses are performed for the small-signal model. The results of the stability analyses are compared with time-domain simulations. Comparisons demonstrate good agreement. In addition, a stabilizing controller is developed for the example system. According to simulations, the proposed controller can stabilize the system.
Original languageEnglish
Title of host publicationThe 16th European Conference on Power Electronics and Applications (EPE'14 ECCE Europe)
Place of PublicationLappeenranta, Finland
Number of pages10
ISBN (Electronic)978-1-4799-3014-2
Publication statusPublished - 26 Aug 2014
MoE publication typeA4 Article in a conference publication


  • converter control
  • modelling
  • simulation
  • voltage source inverter


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