Generalised scalable fault dependent time invariant state space model for large interconnected power systems

• Generalised fault dependent state space model applicable to any power system.
• Includes complete dynamics (stator and rotor) of the synchronous machine.
• It is applicable to both symmetrical and unsymmetrical faults.

In this paper a scalable fault-dependent time invariant nonlinear dynamic state space model of power systems experiencing symmetrical or unsymmetrical fault in the transmission/distribution network is introduced. The power system comprises generating units interconnected to the transmission/distribution networks. Each generating unit is modelled by incorporating full stator and rotor dynamics of a synchronous machine along with the associated excitation and speed governor systems. Proposed modelling approach has been carried out in generic fashion so that power systems of any description can be configured easily by using a user interface simple selection menu. The modelling approach employs a series of coordinate transformations including Park’s and symmetrical components. The validity of the derived model is verified through simulation studies carried out on the IEEE 30 bus test system. Such a scalable full fault-dependent model has not been reported in the open literature previously.