Improved direct power control of grid connected DC/AC converters

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182 Citations (Scopus)

Abstract

This paper proposes new direct power control (DPC) strategies for three-phase DC/AC converters with improved dynamic response and steady-state performance. As with an electrical machine, source and converter flux which equal the integration of the respective source and converter voltage are used to define active and reactive power flow. Optimization of the look-up-table used in conventional DPC is outlined first, to improve the power control and reduce the current distortion. Then constant switching frequency DPC is developed where the required converter voltage vector within a fixed half switching period is calculated directly from the active and reactive power errors. Detailed angle compensation due to the finite sampling frequency and the use of integral controller to further improve the power control accuracy, are described. Both simulation and experimental results are used to compare conventional DPC and vector control, and to demonstrate the effectiveness and robustness of the proposed control strategies during active and reactive power steps, and line inductance variations.
Original languageEnglish
Pages (from-to)1280-1292
Number of pages13
JournalIEEE Transactions on Power Electronics
Volume24
Issue number5
DOIs
Publication statusPublished - May 2009

Keywords

  • DC/AC converter
  • direct power control
  • DPC
  • table lookup
  • voltage
  • analog-digital conversion
  • integral equations
  • power control
  • reactive power
  • sampling methods
  • steady-state
  • switching converters
  • switching frequency

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