Protection of distributed generation interfaced networks

摘要: With the rapid increase in electrical energy demand, power generation form of distributed is becoming more important. However, connections generators (DGs) to a distribution network or microgrid can create several protection issues. The these networks using protective devices based only on current challenging task due change fault levels and direction. isolation faulted segment from such will be difficult if converter interfaced DGs are connected as limit their output currents during fault. Furthermore, DG sources intermittent, sensing relays set since changes with time depending availability sources. system restoration after occurs also issue microgrid. Usually, all disconnected immediately network. safety personnel equipment network, reclosing arc extinction major reasons for disconnections. In this thesis, an inverse admittance (ITA) relay proposed protect which has connections. ITA capable detecting faults isolating allowing unfaulted segments operate either grid islanded mode operations. does not make tripping decision current. It uses voltage at location. Therefore, used effectively level low time. Different case studies considered evaluate performance comparison some existing schemes. evaluated different types networks: radial, IEEE 34 node test feeder mesh results validated through PSCAD simulations MATLAB calculations. Several experimental tests carried out validate numerical laboratory by implementing LabVIEW. novel control strategy fold back overcome problems associated restoration. enables self temporary This helps capacity sufficient supply load. coordination reclosers without disconnecting discussed. increased reliability reduction customer outages.