The composite energy storage device is an effective way to solve such a series of power quality problemsas transient power violation

voltage violation and harmonic pollution and so on

which is caused by the high power density distributed PV access to distribution network. Under the condition of high power density distributed PV access to distribution network

the composite energy storage device can be selected for more installation nodes

which result in large calculation and low efficiency. Inthispaper

anodesensitivity analysis method of power quality management for distribution network with high power density distributed PV is proposed

which cansolve quickly the location and capacity of the composite energy storage device.Firstly

the location and capacity optimization planning model of the composite energy storage device is established

which includes the node voltage deviation

total harmonic distortion rate and the installation cost.Secondly

the node sensitivity analysis method is applied to reduce the number of the installation nodes.The optimization planning model of the combined energy storage device is feasible to install the optional set of nodes

thus greatly reducing the amount of calculation and improving the optimization efficiency in the process of using the improved multi-objective particle swarm optimization to solve the model. Finally

the IEEE 33 nodes distribution system is taken as an example to verify the simulation results

showing that the proposed method has the superiority of the nodal sensitivity analysis method.