Fast Time Domain Simulation And Emergent Control Algorithm For Power System

Fast transient stability simulation is one of the very important techniques for power system stability analysis. Currently, numerical integration methods are explicit method and implicit method. Explicit method has the advantage of high computation speed, but its disadvantage is that there are interfacing error between the differential equation and algebraic equation; implicit method has the advantage of high precision, but the computation burden is very heavy. In this paper, the advantage of both methods is combined, and a good numerical explicit integration with the performance of high precision and high computation speed is proposed. The proposed method improves the computation speed of current implicit numerical integration method used by the power industry significantly. It has the same accuracy with the implicit numerical integration method. Practical large scale system simulation shows that the method has good accuracy and computation speed and can be used for online power system stability analysis. It is easy to program this method. It is expected that the method can be used by the engineers widely. Based on single machine equal area criterion, a new generator-shedding algorithm is proposed. Using fast time domain simulation, when power system is judged unstable, devide generators into forward group and backward group, then power-angle curve can be simulated, based on single machine equal area criterion, which generators to be shedded can be caculated. Compared with tranditional generator shedding method using pre-caculated scheme, the proposed generator shedding algorithm is more adaped to different power system conditions and faults.