2020 | vol. 68 | nr. 1 | art. 9

Optimal PMUs Placement to ensure Power System Observability under Various Contingencies

Abdelkader Azzeddine LAOUID, Ridha Djamal MOHAMMEDI, Mohamed Mounir REZAOUI, Abdellah KOUZOU
The PMUs are high-precision devices used to monitor the operation of the power system. These devices provide synchronized measurement of AC voltage and current phasors at the same time by the global positioning system (GPS). Due to the high costs of these devices, they cannot be placed on all network buses. Therefore this paper aims to find the lowest possible number of PMUs to ensure a complete observability of the power system and improve the measurement redundancy, During normal cases (with and without ZIBs), Then in conditions of failure of single PMUs and outage of single line, by using gravitational search algorithm (GSA). The suggested GSA has been applied to the IEEE 14-bus, 24-bus, 30-bus, 57-bus, New England 39-bus, and Algerian 114-bus. To check the effectiveness and robustness of this technique, a comparison of results is made with some of the methods recently reported. Comparison results show that the proposed technique has succeeded in significantly reducing the number of PMUs and improving the redundancy of measurements.
Keywords: Phasor measurement units (PMUs), Zero injection bus (ZIB), measurement redundancy, gravitational search algorithm (GSA)
To cite this article: LAOUID A. A., MOHAMMEDI R. D., REZAOUI M.M., KOUZOU A., “Optimal PMUs Placement to ensure Power System Observability under Various Contingencies”, in Electrotehnica, Electronica, Automatica (EEA), 2020, vol. 68, no. 1, pp. 76-86, ISSN 1582-5175.