The access of distributed photovoltaic(PV)will have a great impact on the vulnerability level of the distribution net-work,and then affect the safe and stable operation of the distribution network.On the basis of analyzing the power characteris-tics of distributed PV,combined with distribution network node static energy function model and load transfer coefficient corre-lation theory,a comprehensive vulnerability assessment model that can reflect the state and structural of distribution network nodes is proposed.The simulation calculation model of distribution network including distributed PV access is established to study the influence of different grid-connected capacity and different grid-connected positions on the vulnerability of distribution network.The results show that with the increase of PV grid-connected capacity,its impact on the vulnerability of distribution network gradually increases firstly,and then tends to be stable,the minimum value of vulnerability decreases by about 24％and the maximum value increases by about 31％.Moreover,the closer grid-connected nodes of multiple distributed photovolta-ics are to the end of the distribution network,the smaller grid-connected distance,and the greater impact on the vulnerability of the distribution network.
关键词
分布式光伏/配电网/脆弱性/静态能量函数/负荷转移系数
Key words
distributed photovoltaic/distribution network/vulnerability/static energy function/load transfer coefficient
维普
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