A multi-objective control strategy for three phase grid-connected inverter during unbalanced voltage sag

Liang Ji, Jiabin Shi, Qiteng Hong, Yang Fu, Xiao Chang, Zhe Cao, Yang Mi, Zhenkun Li, Campbell Booth

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This paper presents a new multi-objective control strategy for inverter-interfaced distributed generation (IIDG) to ensure its safe and continuous operation under unbalanced voltage sags. The proposed control strategy can effectively improve the low voltage ride through (LVRT) capability, reduce active power oscillations, and limit overcurrent simultaneously, which are marked as the most important control objectives of IIDG during unbalanced voltage sags. The advanced voltage support scheme, which utilizes positive sequence component, is firstly proposed to maximize the LVRT capability of IIDG during unbalanced voltage sags. Then, to ensure the safety of IIDG, the active power
oscillation suppression and current limitation algorithm are designed individually. Based on the control algorithms of such objectives, the multi-objective control method, including scenario classification and reference current determination, is then presented to achieve such three objectives under various system conditions simultaneously. Finally, case studies and evaluations based on MATLAB/Simulink are carried out to illustrate the effectiveness of the proposed method.
Original languageEnglish
Number of pages11
JournalIEEE Transactions on Power Delivery
Early online date18 Sep 2020
Publication statusE-pub ahead of print - 18 Sep 2020


  • active power oscillation suppression
  • current limitation
  • inverter interfaced distributed generation
  • low voltage ride through
  • multi-objective control
  • voltage sag
  • voltage support

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  • A new control method for three phase inverters under unsymmetrical voltage sag conditions

    Shi, J., Ji, L., Hong, Q., Mi, Y., Cao, Z., Khan, A. & Booth, C., 21 Oct 2019. 5 p.

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