To promote the coordinated development between distributed photovoltaic（PV） systems and distribution network

and to improve the absorptive capacity for PV

we put forward a novel bi-level optimization method for locating and sizing of distributed energy storage system（EES） in the distribution network with high penetration of PV. Being in distributed power investor’s shoes

and considering the interests of the network operators

the planning targets include the total capacity of ESS and voltage fluctuation improve index

and the constraints include operation constraint of distribution network

state of charge（SOC） constraint

and operation state constraint of EES. Meanwhile

the method also takes into account the storage optimization operation with the time-sequence matching between EES output

PV system output and load taken into consideration. Finally

the experimental results from the distribution network in Heibei Chengde verify the effectiveness and feasibility of the proposed method. The results reveal that

after using the method

the capacity of ESS can be reduced by 85%

and the voltage fluctuation improvement index can increase by 18% after considering the coordination of energy storage

photovoltaic

and load.