C. Townsend, G. Mirzaeva, G. Goodwin, G. Konstantinou, J. Pou
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引用次数: 5
Abstract
Multilevel cascaded converters for use in battery energy storage systems (BESSs) can utilise parallel-connected dc/dc conversion stages. These stages decouple each battery string voltage from the associated H-bridge capacitor voltage. Decoupling prevents second harmonic current ripple flowing in the batteries and compensates for variation in battery voltage due to state of charge. Instead of parallel-connected converters, this paper proposes use of series-connected fractionally-rated dc-dc conversion stages. Series-connected converters are shown to maintain the benefits of voltage decoupling but with significantly lower power ratings than their parallel-connected counterparts. Lower power ratings can facilitate a reduction in semiconductor losses and a lower cost for the BESS.
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