This paper proposes an output current ripple reduction algorithm using a proportional-integral (PI) controller for an energy storage
system (ESS). In single-phase systems, the DC/AC inverter has a second-order harmonic at twice the grid frequency of a DC-link
voltage caused by pulsation of the DC-link voltage. The output current of a DC/DC converter has a ripple component because of the
ripple of the DC-link voltage. The second-order harmonic adversely affects the battery lifetime. The proposed algorithm has an
advantage of reducing the second-order harmonic of the output current in the variable frequency system. The proposed algorithm
is verified from the PSIM simulation and experiment with the 3 kW ESS model.
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