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Multilevel converters are an emerging industrial technology and are the subject of a substantial amount of research. However, they are yet to find their way into many mainstream engineering applications. This paper presents a method of quantifying the benefits and disadvantages of multilevel converters of increasing order. The analysis focuses on the cascaded H-bride topology for grid-tie battery...
In 2013, the University of Sheffield commissioned a 1 MWh lithium-titanate (LTO) battery energy storage system (BESS), directly connected to the grid through an 11 kV feed. With a view to later on develop a comprehensive model structure for the whole battery pack — key to many online battery management system (BMS) operations — in this paper, an in-depth frequency-domain analysis is performed on one...
There is an increasing prevalence of energy storage systems on the electricity grid network. However, as of yet, there is no overriding standard on how to deal with DC arc-flash calculations and subsequent determination of the PPE requirements for a DC system within the UK. This paper compares various published DC arc-flash calculations using a case study based approach. The paper uses data available...
The high cost of batteries has led to investigations in using second-life ex-transportation batteries for grid support applications. Vehicle manufacturers currently all have different specifications for battery chemistry, arrangement of cells, capacity and voltage. With anticipated new developments in battery chemistry which could also affect these parameters, there are, as yet, no standards defining...
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