access icon free Real time identification of coherent groups for controlled islanding based on graph theory

Since phasor measurement units (PMU) were invented, there has been growing interest in developing methodologies for improving monitoring, protection and control of power systems in real time. In this study, the authors propose a new methodology, based on graph modelling, to identify coherent groups of generators in a real-time fashion. The coherent groups are identified with instantaneous values measured from the system through PMUs, and the methodology needs neither setting the number of desired groups nor defining a threshold value since it is based on coupling factors between generators. Moreover, it is proposed a new method for the online definition of areas for islanding when this action is required as the latest emergency control method. The methodology assigns the non-generation buses to the previously found generators coherent groups considering three criteria: electrical distance to the group of generators, topology, and operational constraints, which are verified by mean of an optimal power flow. The methodology is tested on the IEEE 39-bus and IEEE 118-bus test systems. Results show that the real-time identification of coherent groups and the definition of areas allow the development of islanding strategies with promising results.

Inspec keywords: real-time systems; power distribution faults; graph theory; load flow control; phasor measurement; distributed power generation

Other keywords: emergency control; controlled islanding; instantaneous values; phasor measurement units; electrical distance; optimal power flow; PMU; graph theory; coherent groups; nongeneration buses; coupling factors; IEEE 118-bus test systems; IEEE 39-bus test systems; real time identification

Subjects: Power system measurement and metering; Combinatorial mathematics; Combinatorial mathematics; Control of electric power systems; Distribution networks; Distributed power generation; Power system control

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