Medium voltage DC power systems on ships: An offline parameter estimation for tuning the controllers' linearizing function

Daniele Bosich*, Giorgio Sulligoi, Elena Mocanu, Madeleine Gibescu

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

14 Citations (Scopus)


Future shipboard power systems using Medium Voltage Direct (MVDC) technology will be based on a widespread use of power converters for interfacing generating systems and loads with themain DC bus. Such a heavy exploitationmakes the voltage control challenging in the presence of tightly controlled converters. By modeling the latter as constant power loads (CPLs), one possibility to ensure the bus voltage stability is offered by the linearizing via state feedback technique, whose aim is to regulate the generating DC-DC power converters to compensate for the destabilizing effect of the CPLs. Although this method has been shown to be effective when system parameters are perfectly known, only a partial linearization can be ensured in case of parameter mismatch, thus, jeopardizing the system stability. In order to improve the linearization, therefore, guaranteeing the voltage stability, an estimation method is proposed in this paper. To this aim, offline tests are performed to provide the input data for the estimation of model parameters. Such estimated values are subsequently used for correctly tuning the linearizing function of the DC-DC converters. Simulation results for bus voltage transients show that in this way converters become sources of stabilizing power.

Original languageEnglish
Article number7867753
Pages (from-to)748-758
Number of pages11
JournalIEEE Transactions on Energy Conversion
Issue number2
Early online date1 Mar 2017
Publication statusPublished - Jun 2017
Externally publishedYes


  • Constant power load
  • DC-DC power converters
  • Heuristic optimization
  • Linearization via state feedback
  • Model reduction
  • Parameter estimation


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