Distributed Generation And Its Effects On System Planning

There are some reasons to seek for a new type of generation, which is clean, efficient and flexible, such as a variety of limitations in the traditional power system, the exhausting energy resources, the higher standards of power quality and paying more attention to the environment protection. According to the local situation, distributed generation makes full use of new and clean energy, and is very efficient and flexible. Distributed generation has been paid more attention by many countries, and become to the most important researches in the 21th century.First, the paper introduces the background, the methods of classification, the characters, the actuality and the future of distributed generation. Then, by comparing some distributed generation technologies, such as micro-turbine system, fuel cell system, wind-turbine system and photovoltaic system, it indicates that power electronics technology is very pivotal to distributed generation.This paper introduces the influences that distributed generation makes to power system planning. Because of distributed generation added, the post structure of power system will break up and post system planning methods can't do well in the new system. This paper presents the steps of network planning and does deeper researches on the placement of distributed generation sources. By analyzing the radial feeders and networked systems, it proposes analytical approaches to determine theoptimal location to place the distributed generation source. Then some examples are taken to get the optimal locations, which are the same with simulation results. In the end, the paper points out that distributed generation does possible influences on power flow, system voltage, power quality and relay protection.