| 摘要 |
PROBLEM TO BE SOLVED: To continuously compute and output a current stability margin and supply a measured value of its quality. SOLUTION: In a method and system for assessing the stability of an electric power transmission network, where at least one pair of measured values comprising first and second measurement points (P1, P2), each measurement point comprising a voltage and a current phasor, is processed, and where Thevenin impedance (Zt) and a current stability margin (dS(k)) value are computed, a validity indicator (v) is computed which depends on whether there is a difference between the first and second measurement points and whether there is a difference between, corresponding estimated first and second load impedances (Za). From all validity indicators (v) associated with all of at least one pair of measured values, a quality indicator (q) is computed, which is associated with the Thevenin impedance value (Zt) and with the current stability margin (dS(k)). |
