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Abstract:
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After experiencing the price hikes and rotating blackouts in California , the disbursed or distributed generation (DG ) is considered as one of the most attractive alternatives for future utility industry . In addition to the conventional DG that uses fossil -fuel to generate power , the DG via renewable energy is of interest due to the environmental concern . Fuel cell and photovoltaic are the most promising technologies for the urban residential and small commercial users . For economic and reliability purposes , it is desirable for these facilities to be interconnected with the utility grid to perform peak shaving , demand reduction , and to serve as emergency and standby power supply . However , the mismatch between the utility tie protection and the equipment protection make it impossible for the fuel cell and /or photovoltaic to serve as emergency and standby power supply when the utility supply is lost due to nearby external faults . To overcome this issue , this dissertation proposes the development of an integrated high -speed intelligent utility tie unit (IUT ) to monitor , control , and protect the system for residential users to enable their disbursed /renewable generation facilities to serve as emergency and standby power supply . The proposed algorithm of the IUT is verified with computer simulation and experimental results . |