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Simulation of battery discharge emulator using power electronics device with cascaded P-I control

Abstract:

This paper proposes a battery discharge emulator to simulate the discharge behavior of a commercial Li-ion battery. The emulator is based on a power electronics circuit that allows the ripple levels of its voltage output to be reduced. A system based on three-phase interleaved DC-DC boost converter in combination with an electric equivalent circuit battery model enables to emulate the discharge behavior of the battery. The parameters for the electrical equivalent circuit model were extracted using the time-domain parameter extracted method. The voltage response characteristics for the emulator were validated experimentally under the same discharge profiles as the Li-ion battery. The results of the simulations show maximum absolute errors of around 3% in replicating the steady state and dynamic behavior for the output voltage of the Li-ion battery with discharge currents up to 1C rate (4A).