Reactive Power Optimization of Distribution Network Considering the Reactive Power Regulation Ability of Distributed Power Generation Cluster

In recent years, due to large-scale grid-connection of such distributed generation as wind power and photovoltaic (abbr. PV) power the difficulty of reactive power optimization is increased, however, in existing researches the voltage out-of-limit caused by higher reactive power vacancy appeared after the grid-connection of distributed generation cluster (abbr. DGC) is seldom considered. For this reason, the capacity characteristic curve of DGC was researched, when reactive power deficiency appeared in power grid, by means of decreasing active output of DGC and increasing reactive output range of DGC the reactive power demand of power grid could be satisfied. A reactive power optimization model of distribution network containing DGC was established, and considering the secure operation of distribution network, the voltage deviation, network loss and the power purchase cost were taken as optimization objectives, the multi-objective problem was characterized by ε constraint method and solved by using algorithm package. Finally, through IEEE 39-bus system the effectiveness of the established model was verified.