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Distributed generator is often associated with the existing distribution network system, the study of the impact of the distributed generation on original distribution network system is very important for the development of the smart grid. The study on the voltage can contribute to the safety, reliability and efficiency of the distribution network system. As the distributed generations connected to the grid, the calculation of power flow will change. Joining the distribution generation into the distribution network system safely and reliably is significant and this also related to the value of the distributed generation.The impacts of voltage in the distributed system will directly affect quality of power supply and system stability as the injection of the distributed generations. When decided locations of the distributed generations, not only the surrounding energy, transportation, geographical and environmental factors, but also the rationality of the distributed generator location shall be considered. Thus the study of the impact of voltage becomes more and more vital after the injection of distributed generation.

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