A Novel Sequential Transient Stability Constrained Optimal Power Flow

A different approach for formulating the sequential TSC-OPF problem is proposed in this paper, where only two power re-dispatch constraints are added to a conventional OPF model to formulate the proposed TSC-OPF model. These two constraints are derived from a proposed best direction vector that provides the power re-dispatch direction in which the rotor angular deviations at the time to instability decrease at the maximum rate of change. In this way, the resulting TSC-OPF model forces the magnitude and direction of the power re dispatch in order to steer the power system operation state to a transiently stable equilibrium point. The effectiveness of the proposed method is numerically demonstrated in the WSCC 3-machine, 9-bus system.