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.
|Title of host publication||2016 IEEE 2nd Annual Southern Power Electronics Conference, SPEC 2016|
|Publisher||IEEE, Institute of Electrical and Electronics Engineers|
|Publication status||Published - 1 Jan 2016|
|Event||2nd IEEE Annual Southern Power Electronics Conference, SPEC 2016 - Auckland, New Zealand|
Duration: 5 Dec 2016 → 8 Dec 2016
|Conference||2nd IEEE Annual Southern Power Electronics Conference, SPEC 2016|
|Period||5/12/16 → 8/12/16|