The Credibility and power quality have been increasingly important in recent years due to the number of black-out events occurring through in the world. Bulk transmission systems are planned to meet specified criteria in an attempt to provide consistently high reliability for utility customers. One of the very important requirements in the planning and operation of a bulk power system is maintaining reliability of service to the loads. Planning engineers are interested in representing systems in as much detail as possible and in studying as many contingencies as possible, using accurate power flow algorithms.
Because of the energy resource's exhaustion and conservation of nature and the introduction of the distributed generation it is , however, very difficult to understand various power flow algorithms. In this dissertation the meaning of the distributed generation and the protect system in power line are presented.