Assessment On The Impact Of Distributed Generation (Dg) Penetration On Grid Protection System

Fazliana, Ahmad Buderi (2015) Assessment On The Impact Of Distributed Generation (Dg) Penetration On Grid Protection System. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Distributed Generation (DG) is the generation of electricity from multiple renewable energy sources and is located closer to the user, or load. These days the DGs is developing rapidly because of the advantages it could bring into the system such as enhance the transmission efficiency energy as well as reduction of climate change. However, the penetration of a DG to the existing distribution system potentially may contributes too many impacts, with the power system protection being one of the major issues. This is because renewable energy sources, such as solar or wind-power generating systems produce intermittent electrical energy that is not fully compatible with existing electrical grid protection systems. The introduction of a DG into a distribution system brings about a change in the fault current level of the system and causes many impacts in the protection system, such as false tripping of protective devices, protection blinding, an increase and decrease in short circuit levels, undesirable network islanding and out of synchronism reclosers. The main goal of this assessment is to investigate the possible impacts that may occur on the grid protection system with the presence of the DG. In this assessment, different cases of simulation have been developed in the Power System Computer Aided Design (PSCAD) regarding to the distribution network without and with the presence of DG on the system and the results from this both cases have been compared. Based on the results from this assessment, penetration of DG increases the level of the fault current eventually causes the affect towards the unit and non-unit protection in the system. This condition leads to two main problems in protection system which are protection blinding and loss of coordination or sympathetic tripping. In the future works, author intended to find a suitable solution in order to mitigate either blinding of protection or loss of coordination/sympathetic tripping problems that arise when the DG is penetrated to the distribution network.

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