Impact of Distributed Generation on the Voltage Sag Performance of Transmission Systems

• Main Authors: Pierluigi Caramia, Enrica Di Mambro, Pietro Varilone, Paola Verde
• Format: Article
• Language: English
• Published: MDPI AG 2017-07-01
• Series: Energies
• Subjects: power quality; voltage sag; power transmission
• Online Access: https://www.mdpi.com/1996-1073/10/7/959

In this paper, we analysed the growing penetration of generating units from renewable energy sources in transmission power systems. Among the possible effects of the interaction of distributed generation (DG) with transmission systems, we considered the abnormal operating conditions caused by short circuits in the transmission systems and the resulting voltage sags that occur in the network. A systematic method is presented for analysing the voltage sag behaviour of any transmission system in which large DG units are connected to the transmission system by means of High Voltage/Medium Voltage (HV/MV) stations. The method proposed for obtaining the voltage sags is the fault position method (FPM), from which we derived a graphical visualization of the during-fault voltage (DFV) matrix as a valuable tool to obtain an immediate measure of the propagation of voltage sags in the network. The results obtained were based on a portion of a real transmission system. The system that we considered is an actual portion of the Italian transmission system, and all of the quantities we used were obtained from the data of the Transmission system operator (TSO).