Optimization of the Event-Driven Emergency Load-Shedding Considering Transient Security and Stability Constraints

Xin Xu, Hengxu Zhang, Changgang Li, Yutian Liu, Wei Li, Vladimir Terzija

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


Emergency control is an important measure for prevention of power system blackouts. This paper presents a new event-driven emergency load-shedding scheme that minimizes load shedding while meeting constraints on transient angle stability, voltage/frequency deviation security, and availability of load to be shed at any bus. The evaluation of these constraints is based on time domain trajectories provided by numerical simulations. The optimal event-driven load-shedding (OEDLS) model was created to minimize the total load-shedding cost. By analyzing the characteristics of the optimal solution of this model, a trajectory sensitivity based solution approach is presented. It linearizes the nonlinear OEDLS model through trajectory sensitivity and iteratively converges to the optimal solution. To accelerate the problem solving process, a parallel computation scheme is implemented for obtaining the trajectory sensitivities. The validity of the proposed algorithm and parallel computation scheme was tested and verified using two different power systems.

Original languageEnglish
Article number7726016
Pages (from-to)2581-2592
Number of pages12
JournalIEEE Transactions on Power Systems
Issue number4
Publication statusPublished - Jul 2017
Externally publishedYes


  • Angle stability
  • frequency security
  • load-shedding
  • optimization algorithm
  • parallel computation
  • trajectory sensitivity
  • voltage security


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