Measurement-based Voltage Stability Assessment for Load Areas Addressing n-1 Contingencies
نویسندگان
چکیده
This paper proposes an online measurement-based method for n-1 voltage stability assessment on a load area by means of an equivalent system of N+1 buses introduced by ref. [1] to represent N boundary buses of the load area and the external system. This method utilizes real-time synchro-phasor measurements on N boundary buses and online state estimation on the load area to analyze n-1 sensitivities for equivalent transfer admittances and power flows by means of a Modified Line Outage Distribution Factor (MLODF) in order to estimate the voltage stability margin of power transfer to each boundary bus under an anticipated n-1 condition. The method is demonstrated on the Northeast Power Coordinating Council 48-machine, 140-bus power system.
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