Identification of coherent generator groups in power system networks with windfarms

This paper presents coherency based analysis technique for network reduction to carry out transient stability analysis for a power system that has some wind penetration. Identification of coherent groups targets to obtain simplified dynamic equivalent of system by aggregation of coherent generators using an equivalent generator. Equivalent model can transform a large power system into a reduced model, localized into a small internal area containing the fault. This paper aims to illustrate the procedure of obtaining coherent generators with and without windfarms in the system. Coherency based analysis has been carried out on The New England 39 Bus 10 machine system with windfarms. Simulations for this test system are obtained using DigSilent-Power factory software.