The following repository contains the data for [1], a paper describing the multi-period optimal power flow methodology that uses differencial dynamic programming to solve large testcases.
The file, "case14_modified_ess.m" contains the data for the modified IEEE 14 bus testcase that includes an energy storage device on bus 2.
[1] Aayushya Agarwal, Larry Pileggi, "Large Scale Multi-Period Optimal Power Flow with Energy Storage Systems using Differential Dynamic Programming"