Abstract: To select HESS site and capacity in distribution system with renewable energy access,a two-layer optimization model considering the property of HESS is constructed,which thereby improving the operation economy and stability of the system. Firstly,this paper selects battery and super-capacitor to form HESS and connect it to the distribution system to give full play to the highefficiency charging and discharging and high-energy throughput characteristics of HESS. Secondly,a two-layer optimization model for HESS site and capacity selection considering the property of HESS is proposed. The upper layer aims at the minimum LCC of the HESS,and take the configuration capacity and access location as the optimization variables,in which the operation cost needs to be calculated by the lower layer;the lower optimization aims to minimize the network loss,establish a SOCP model,and feed backs the planning results to the upper layer. Finally,case studies are carried out on the IEEE 33-bus distribution network,compared with ESS,the proposed HESS and its configuration strategy can effectively improve the operational stability of the distribution network under the high proportion of renewable energy access,while ensuring the operation economy of the distribution network.