Broadband Equivalent Modeling and Common-Mode Voltage Conduction Analysis of Electrochemical Energy Storage System

Electrochemical energy storage system play an important role in the reform of the national energy system and the construction of the energy Internet. Whether small or large capacity battery storage converters, the characteristics of their power electronics can generate high frequency common mode voltage that can be potentially harmful to battery storage system. This paper systematically investigates the common-mode interference (CMI) of electrochemical energy storage system. The mechanism of common-mode interference is revealed, a broadband equivalent circuit model of common-mode voltage in electrochemical energy storage system is established, the effect of parasitic capacitance of the battery on common-mode voltage is simulated and analyzed, and the broadband equivalent circuit model is verified based on laboratory data.