A simplified stability analysis method for LV inverter-based microgrids


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Dag B., Aydemir M. T.

JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY, vol.7, no.3, pp.612-620, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 7 Issue: 3
  • Publication Date: 2019
  • Doi Number: 10.1007/s40565-018-0478-1
  • Journal Name: JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.612-620
  • Keywords: Inverters, Microgrids, Stability analysis, Droop control, Distribution networks, PARALLEL OPERATION, DROOP CONTROLLER, MODEL, STRATEGY
  • Gazi University Affiliated: Yes

Abstract

This paper presents a simplified small-signal stability analysis method for low voltage (LV) inverter-based microgrids, in a generalized manner. The simplification is based on a simplified microgrid structure that relies on dominating inverter coupling impedances with respect to interconnecting line impedances of LV distribution networks. The analysis is further simplified by analytically determining equilibrium points of system state variables in terms of known microgrid parameters. And it eliminates the additional analysis required for determination of theequilibrium points ofthe state variables. Simulation and analysis results show that the proposed method successfully predicts the instability boundaries of microgrid systems for resistive interconnecting lines.