Transient Stability Analysis of Distribution Network with Dispersed Generation

In this paper transient stability of an existing 10 kV distribution network with combined heat and power plants, microturbinesand wind turbines is analyzed. In order to do this, dynamic models of the network and generators have been created and simulations for faults at different network locations have been done. From the analysis it appears that the most critical parameter, which influences transient stability in the test network, is the inertia of a microturbine. Simulations have shown that there is linear relationship between inertia constant of microturbine and critical clearing time. After that it has been checked that the protection of DG satisfies transient stability requirements. In the end, the possibility for providing DG support to the network during and after disturbances using fault ride-through concept has been considered and simulations illustrate that DG protection can guarantee transient stability in this case as well.