Abstract
This study proposes a modular bidirectional converter system for hot-swappable energy storage systems (ESSs). The proposed modular converter has a four-leg interleaved structure, and therefore it can reduce input current ripples and is suitable for secondary cells. Moreover, if any of the legs fails, hot-swap is available through phase control inside the converter. The modular converter uses an independently controllable battery as an input power source, allowing the charge and discharge control according to each stated of charge (SOC). The output voltage of the converter circumvents the module in the event of a high-voltage output control and a fault (exchange due to battery life, repair of converter) through the cascade-type bypass, thereby enabling continuous operation. The hot-swap operation of the proposed modular ESS converter system and the charge and discharge control algorithm according to battery SOC are verified by experiment.
Highlights
The ever-growing power consumption and the demand for high-quality power are bringing distribution power systems into increasing prominence
This trend is accompanied by the growing use of modular multilevel converters (MMCs) in order to satisfy the demand for high-quality electricity
This study proposed a hot-swappable modular bidirectional converter MIMC for energy storage systems (ESSs)
Summary
The ever-growing power consumption and the demand for high-quality power are bringing distribution power systems into increasing prominence. The application of distributed power systems comes in this context with the aim of addressing these issues [1,2,3] This trend is accompanied by the growing use of modular multilevel converters (MMCs) in order to satisfy the demand for high-quality electricity. MMCs can increase the switching frequency compared to single modular converters through interleaved control, thereby decreasing the filter size and input current ripples [4,5,6] Driven by their high system stability and low input current ripples, MMCs are widely implemented in battery-powered energy storage systems (ESSs) as well as for charging and discharging converters in electric vehicles [7,8,9]
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