Optimal Damping Recovery Scheme for Droop-Controlled Inverter-Based Microgrids

Gurupraanesh Raman, Jimmy Chih Hsien Peng, Hatem H. Zeineldin

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Inverter-based microgrids may experience small-signal stability issues as the generation, loading or network topology change in real-time. This paper presents an event-triggered damping recovery scheme to improve the stability of a system with droop-controlled inverters and synchronous machines in the event of poorly damped power flows. The droop coefficients of the controllable inverters are manipulated in real-time based on their node sensitivities so as to obtain the maximum damping effort per unit additional power injected. This prevents the overloading of any one inverter or group of inverters in the system and reduces the power sharing disparity that arises from the damping recovery process. For determining the node sensitivities, a novel damping sensitivity formula is presented as an alternative to conventional sensitivity analysis. This enables the reduction of computation complexity from O(n^3) to O(n), making the proposed algorithm scalable to large systems. Experimental and simulation case studies are presented to demonstrate the effectiveness of the proposed control scheme in restoring damping, as well as its robustness to communication failure.

Original languageBritish English
Article number8957696
Pages (from-to)2805-2815
Number of pages11
JournalIEEE Transactions on Smart Grid
Issue number4
StatePublished - Jul 2020


  • Damping recovery
  • droop control
  • inverter-based generation
  • small-signal stability


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