| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 99 === In this thesis, a distribution network, characterizing the microgrid, is constructed with a solar power system, diesel engine generators and wind turbines established by using Matlab/Simulink. Microgrid may be operating in the island mode or connected mode. And it needs to be protected under any type of mode. Therefore, this thesis is discussed the coordination optimization of overcurrent relay for microgrid system. In the relay setting, through the three-phase fault current analysis and ground fault current analysis, using the particle swarm algorithm to set the pickup current value and the time dial setting of the overcurrent relay and ground overcurrent relay. In addition, central control unit is joined to microgrid for adjusting relay parameters; therefore, protective systems can maintain protective coordination under different modes.
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