Optimal instantaneous prediction of voltage instability due to transient faults in power networks taking into account the dynamic effect of generators

Changes in consumption and changes the structure of system always occur each power system. One effects these can be instability voltage. When voltage is unstable, their performance conditions fluctuations after large errors occur. Determining stability traditional methods time consuming does not have necessary efficiency for instantaneous monitoring. In this paper, an index based on two indices frequency deviation response inertia occurrence perturbation presented, which has ability to detect at same high speed timely estimation addition, indicator been used determine appropriate start load removal (voltage reduction load). All simulations are performed IEEE 33-bus network DIgSILENT software, results indicate that proposed a very low computational load. Because method prediction depend model require any threshold value. Therefore, These advantages make interesting option online practical applications.