Some Issues Concerned with PMU-Based Security Control of Electric Interconnected Systems

Abstract

Electric Power system automation includes monitoring, evaluation, analysis, and control of processes associated with generation and transmission of electric energy from power stations to customers [1]. Power system state estimation with online and synchronized phasor measurements plays a key role in the energy management systems (EMS) providing instantaneous values of the electrical variables in the grid that are further used in functions such as contingency analysis, automatic generation control, load shedding and on-line evaluation of the security of the system, among others. In this brief communication a conceptual insight about these concepts is given, in particular those related with load shedding and islanding of power systems under extreme conditions.