Transient Stability Constraints and Protective Coordination in Distributed Resource Distribution Systems

One of the serious issues related to these sources is the effect of system errors on their transient stability, which due to the low inertia of the generators and the slow performance of protection equipment in distribution systems, their transient instability is quite possible. In this paper, first the dynamic behavior of scattered sources on system errors and then the sensitivity of scattered sources to system parameters are investigated. In the next step, some practical protection settings are explained, which are used as voltage relays, and their advantages and disadvantages are mentioned. Finally, based on the results of sensitivity analysis, a new protection method has been proposed to maintain the stability of scattered resources in the event of an error in the distribution network. The proposed method separates scattered resources from the distribution network according to an active time-power relationship. For all cases under review, the error clearance time is less than the critical clearance time. The simulation results also show that the proposed method is resistant to system transitions.