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access icon free Parallel-differential evolution approach for optimal event-driven load shedding against voltage collapse in power systems

  • Author(s): Yan Xu 1 ; Zhao Yang Dong 2 ; Fengji Luo 1 ; Rui Zhang 1 ; Kit Po Wong 1, 3
    • View affiliations
    • Affiliations: 1: Centre for Intelligent Electricity Networks, The University of Newcastle, Newcastle, Australia;
      2: School of Electrical and Information Engineering, The University of Sydney, Sydney, Australia;
      3: School of Electrical, Electronic and Computer Engineering, The University of Western Australia, Perth, Australia
  • Source: Volume 8, Issue 4, April 2014, p. 651 – 660
    DOI:  10.1049/iet-gtd.2013.0385 , Print ISSN 1751-8687, Online ISSN 1751-8695
© The Institution of Engineering and Technology
Received 05/06/2013, Accepted 23/09/2013, Revised 07/09/2013, Published 02/12/2013

Event-driven load shedding is an effective countermeasure against voltage collapse in power systems. Conventionally, its optimisation relies on sensitivity-based linear methods, which, however, could suffer from unrealistic assumptions and sub-optimality. In this study, an alternative approach based on parallel-differential evolution (P-DE) is proposed for efficiently and globally optimising the event-driven load shedding against voltage collapse. Working in a parallel structure, the approach consists of candidate buses selection, voltage stability assessment (VSA) and DE optimisation. Compared with conventional methods, it fully considers the non-linearity of the problem and is able to effectively escape from local optima and not limited to system modelling and unrealistic assumptions. Besides, any type of objective functions and VSA techniques can be used. The proposed approach has been tested on the IEEE 118-bus test system considering two cases for preventive control and corrective control, respectively, and compared with the two existing methods. Simulation results have verified its effectiveness and superiority over the compared methods.

Inspec keywords: optimisation; voltage control; load shedding; power system dynamic stability; evolutionary computation

Other keywords: VSA; event-driven load shedding; power systems; candidate buses selection; voltage collapse; IEEE 118-bus test system; preventive control; sensitivity-based linear methods; corrective control; optimal event-driven load shedding; parallel-differential evolution approach; DE optimisation; P-DE; parallel structure; voltage stability assessment; objective functions; VSA techniques

Subjects: Power system control; Optimisation techniques; Voltage control; Optimisation techniques; Stability in control theory; Control of electric power systems; Power system management, operation and economics

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