Abstract:

The ultra-high ratio and ultra-large scale new energy sources connected to the grid pose a huge challenge to the safe,stable and economic operation of the power system.For the surge of the system flexible regulation resources,the short-time electrochemical energy storage can not cope with the long-time power shortage of the system,which requires a larger scale and longer time regulation method.First,taking the operation cost of thermal power units as the optimization target and the maximum discharge time of electrochemical energy storage as the boundary,the short-time energy storage and long-time energy storage are divided.Then,the optimal operation model and capacity allocation method based on the operational simulation of hybrid energy storage system is put forward,which are solved by MATLAB optimization toolbox CPLEX.Finally,taking the actual data of a district in northwest China as an example,the urgent demand of the new power system for the long-time and large-scale regulation means is verified,and the configuration results of the hybrid energy storage in this region under the different boundary conditions are calculated to provide the theoretical support for its energy storage planning layout.

Key words: ultra-high ratio, ultra-large scale new energy, hybrid energy storage, operational simulation, optimal capacity allocation