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

• Published in: IET generation, transmission & distribution Vol. 8; no. 4; pp. 651 - 660
• Main Authors: Xu, Yan, Dong, Zhao Yang, Luo, Fengji, Zhang, Rui, Wong, Kit Po
• Format: Journal Article
• Language: English
• Published: Stevenage The Institution of Engineering and Technology 01.04.2014; Institution of Engineering and Technology; The Institution of Engineering & Technology
• Subjects: Applied sciences; Assessments; candidate buses selection; Control systems; corrective control; Data buses; DE optimisation; Disturbances. Regulation. Protection; Electrical engineering. Electrical power engineering; Electrical power engineering; Escape systems; event‐driven load shedding; Evolution; evolutionary computation; Exact sciences and technology; IEEE 118‐bus test system; Load shedding; Miscellaneous; objective functions; Operation. Load control. Reliability; optimal event‐driven load shedding; optimisation; Optimization; parallel structure; parallel‐differential evolution approach; Power networks and lines; power system dynamic stability; power systems; preventive control; P‐DE; sensitivity‐based linear methods; Systems modelling; Voltage collapse; voltage control; voltage stability assessment; VSA; VSA techniques; load shedding; corrective control; DE optimisation; VSA; parallel structure; objective functions; preventive control; voltage stability assessment; evolutionary computation; optimisation; voltage collapse; IEEE 118-bus test system; parallel-differential evolution approach; sensitivity-based linear methods; optimal event-driven load shedding; power systems; power system dynamic stability; P-DE; VSA techniques; candidate buses selection; event-driven load shedding; voltage control; Performance evaluation; Load shedding; Voltage fall; Power system stability; Parallel architectures; Parallel; Modeling; Non linear phenomenon; Optimization; Bus system; Sensitivity; Electrical network; Power system protection; Dynamic stability; Voltage stability; System simulation; Objective function; IEEE standards; Non linear effect; Effectiveness factor; Comparative study
• ISSN: 1751-8687; 1751-8695
• DOI: 10.1049/iet-gtd.2013.0385

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.