The inductor subdues any output current fluctuations by changing its behavior between a load and a supply based on the SMPS current ripple. The inductor behaves like a load and stores energy to prevent ripples from producing excess current. It acts like a current supply when the ripple reduces the current value.
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Abstract: The circulating current in MMC-BESS can't be avoided although battery storage units are added to the MMC to solve the absorption problem in the process of new energy grid connection. The harmonic components of circulating current will introduce extra power loss, increase current stress of power devices, and even cause instability .
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