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Date of Award


Document Type

Campus Access Master's Thesis

Degree Name

Master of Science in Electrical and Computer Engineering (MS)

Administrative Home Department

Department of Electrical and Computer Engineering

Advisor 1

Bruce A. Mork

Committee Member 1

Flavio B. Costa

Committee Member 2

Leonard J. Bohmann


Integration of renewable energy in the power systems has come with both pros and cons. Although these resources are eco-friendly and sustainable, they increase the complexity of power system protection studies. These resources are called Inverter-based Resources (IBR) and the control strategies used in the inverters determine what the relays see. These controls usually limit the maximum current to 1.1-1.5 pu. Moreover, the controls convert the three-phase current into dq0 domain, making the phase currents indistinguishable during a fault. Conventional relay protection schemes, such as distance protection, malfunctions due to these adversities. More advanced protection schemes, such as line differential protection, are required in these situations.

Two SEL-411L relays have been used to implement an array of line differential protection tests. One of the lines (L89) in IEEE 9-bus system is the protected line in all the tests. Relay settings have been developed for each relay and a doble F6150SV power system simulator has been used to playback relay event files (COMTRADE) in the relays. An SEL-2488 Satellite Synchronized Network Clock has been used for time synchronization during the tests. An SEL-2730M Manage 24-Port Ethernet Switch has been used to connect all the test equipment to the same ethernet network. Although the line differential protection scheme performs much better than the distance protection scheme with IBR integration, there are certain challenges of implementing this scheme as well, which have been discussed in the section Recommendation for Future Work.