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Research on Line Overload Emergency Control Strategy Based on the Source-Load Synergy Coefficient

  • Ma, Jing (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University) ;
  • Kang, Wenbo (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University) ;
  • Thorp, James S. (Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University)
  • Received : 2016.05.20
  • Accepted : 2018.01.26
  • Published : 2018.05.01

Abstract

A line overload emergency control strategy based on the source-load synergy coefficient is proposed in this paper. First, the definition of the source-load synergy coefficient is introduced. When line overload is detected, the source-load branch synergy coefficient and source-load distribution synergy coefficient are calculated according to the real-time operation mode of the system. Second, the generator tripping and load shedding control node set is determined according to the source-load branch synergy coefficient. And then, according to the line overload condition, the control quantity of each control node is determined using the Double Fitness Particle Swarm Optimization (DFPSO), with minimum system economic loss as the objective function. Thus load shedding for the overloaded line could be realized. On this basis, in order to guarantee continuous and reliable power supply, on the condition that no new line overload is caused, some of the untripped generators are selected according to the source-load distribution synergy coefficient to increase power output. Thus power supply could be restored to some of the shedded loads, and the economic loss caused by emergency control could be minimized. Simulation tests on the IEEE 10-machine 39-bus system verify the effectiveness and feasibility of the proposed strategy.

Acknowledgement

Supported by : Chinese University Scientific Fund

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