UDE-Based Robust Droop Control of Inverters in Parallel Operation

Qing Chang Zhong, Yeqin Wang, Beibei Ren

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


Conventional droop control methods cannot achieve accurate proportional reactive power sharing, due to the mismatch of components, system disturbances, etc. In this paper, an uncertainty and disturbance estimator (UDE)-based robust droop controller is proposed to address these problems. As a result, the model nonlinearity and uncertainty (e.g., power angle and uncertain output impedance) and system disturbances (e.g., variations of output impedance, load change, and fluctuating dc-link voltage) can be estimated and compensated. Experimental results from a single-phase system with two inverters are provided to demonstrate the effectiveness of the proposed strategy. In order to further demonstrate the advantage and flexibility of the proposed UDE-based control strategy, simulation results from a three-phase system with two inverters are presented with comparison to a robust droop control strategy reported.

Original languageEnglish
Article number7869274
Pages (from-to)7552-7562
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number9
StatePublished - Sep 2017


  • Droop control
  • inverters in parallel operation
  • proportional load sharing
  • robust droop control
  • uncertainty and disturbance estimator (UDE)


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