Small Hydropower Grid Issues Related To Research Of Jiujiang

China takes the first place for hydropower resources.Distributed energy such as small hydropower will face a great chance of development with depletion of traditional energy and the awareness of environment protection.The safe and economical operation of distribution network attracts widespread attention as a large-scale of clean energy connecting to it.Active distribution network(ADN)could make efficient use of distributed power and other legacy facilities by effective management of controlled resources in the network.ADN can take various factors into consideration and make a global optimization,so that the power network can run in the most economical operation on the basis of the security of the network.ADN is designed to address the problem caused by highly feed-in distributed power and improve the controllability of power network,which plays a crucial role for the development of distributed power.Reactive power and voltage of power network is an important problem which directly influences voltage quality of the system as well as which relates to economical operation of power network.During the previous calculation of reactive power and voltage in the power network,reactive power insufficiency and the system under-voltage are always concerned.In the same way,we should consider the problem that reactive power surplus and over-voltage during the period of high flow but under load.This paper will take jiujiang power grid as the research object and combine the operation and geographical situation of jiujiang local power grid to study the problems of small hydropower grid connection in jiujiang power grid.