the formulae for smis are derived and verified by case simulation, the solution of critical clearing time (cct) of three-phase short fault in mms is theoretically discussed.
the transient angle stability margin and critical clearing time are computed by fastest under different proportion of dynamic electric load model using in henan power grid.
when the influence of load model on transient stability is being assessed, factors which effect the stability limit, such as the maximum power transfer, critical clearing time etc.
a direct method considering transient voltage dip is proposed to calculate the critical clearing time (cct) ensuring that voltages of post fault power system are higher than limit.