Large-Signal Stability Improvement of DC-DC Converters in DC Microgrid

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Abstract

In DC microgrids, constant power loads (CPLs) reduce the effective damping of the DC-DC converter and may induce destabilizing effects into the DC-DC converter. To overcome such problems regarding CPL and ensure large-signal stability of DC-DC converters in DC microgrids, some feedforward terms are added to V-I droop-based dual-loop controller for a DC-DC converter based on the large-signal model. It is proven that the feedforward terms can not only improve the transient response but also guarantee the exponential stability of the closed-loop system in the whole operating range in regards to a large-signal manner, which is verified by using a singular perturbation model. Moreover, a disturbance observer is designed to estimate the output current, thereby enabling the removal of the current measurement sensor. The proposed technique can be easily plugged into a pre-defined V-I droop-based dual-loop controller without an additional sensor being required. Ultimately, both simulation and experimental tests verify the effectiveness of the proposed method.
Original languageEnglish
JournalI E E E Transactions on Energy Conversion
Pages (from-to)1-11
Number of pages11
ISSN0885-8969
DOIs
Publication statusPublished - Feb 2021

Keywords

  • DC microgrid
  • DC-DC converter
  • DC-DC power converters
  • Damping
  • Load modeling
  • Microgrids
  • PI control
  • Stability analysis
  • Voltage control
  • constant power load
  • disturbance observer
  • exponentially stable

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