The energy storage system (ESS) is widely applied to enhancing renewable energy accommodation and optimizing distribution network operation. However

the optimization problem of distribution network will get more complicated when the regulation of ESS is taken into account

which makes higher requirements on the optimization algorithm. Therefore

a fast calculation method of integrating ESS into the regulation of distribution network based on conic programming (CP) is proposed. Firstly

a basic optimization model of ESS for distribution network regulation is developed. Secondly

a method is presented to convert the basic model into an equivalent conic model as the standard format of the CP required

and then the optimization problem of ESS is solved rapidly and accurately by taking advantage of the CP solver. Finally

the validity of the conic model conversion and rapidity of the CP method are demonstrated through a test example. This work is supported by National Key Technologies R&D Program (No. 2013BAA01B02) and National Natural Science Foundation of China (No. 51307116).