In-depth investigation of the optimal coordinated voltage emergency control model

This paper investigates the concerns associated with the previously proposed optimal coordinated voltage emergency control (OCVEC) model. The issues in concern include the influence of control delay on the performance of OCVEC, the effects of parameter errors of load model on the OCVEC performance, and the methodology to select the vulnerable buses being included in the voltage stability performance index. In addition, the computational complexity of OCVEC model is assessed.