This research is based on the coupled control of the intelligent transformer tap changer and the energy storage SOC. A double-layered mechatronic-electrochemistry control law (EM-ELC) is proposed. The upper layer of the control law was model predicative control (PAC), which optimized the tapping decision. The lower layer was a combination of the feedback control and the feedback control, which was used to realize the trajectory tracking compensation of the SOC. In the middle, the feedback control was used to realize the coordinated control. Based on the measured data of Zhejiang 220 kV-power grid load storage demonstration station and the verification of the semi-physical platform, the results show that the method can significantly reduce the mismatching event, voltage fluctuation and SOC-drift, and reduce the network loss. This research provided technical support for the fine dispatch of the new power system. Its innovation was that it was the first time to propose the “tap-SOC-level” index to measure the synergy between the two. It also publicized the relevant data sets and algorithm packages to provide reference for subsequent research. It had important engineering application value and theoretical significance.