Power electronics for scalable energy storage systems

  • Start  Thursday 27 Feb 2014 1:00pm
  • Finish    Thursday 27 Feb 2014 2:00pm
  • Venue  Engineering Science

Dr Dan Rogers, Cardiff University

In order to directly rival the Dinorwig pumped hydro station, future grid-scale energy storage systems will need a capacity of at least 1 GWh. If such a system were to be based on 100 Ah Li-ion cells, it would require the interconnection and management of around three million individual cells. Given a cell MTBF of 100 years, a failure rate of around 3 cells per hour of operation should be expected – the system must therefore be designed to cope with frequent failure of its component parts. In this presentation we will explore how modern power electronic circuits such as the modular multi-level converter can gracefully manage cell failure and efficiently correct imbalance between cells. The particular current stress that simple types of multi-level converter apply to individual cells will be illustrated as this may have a negative effect on cell efficiency and longevity that counterbalance some of the benefits of such circuits.

Dan Rogers is alecturer at Cardiff University. His interests lie in the design and control of power electronic circuits and systems, ranging from industrial applications of about 1 kW up to grid-scale applications at 100 MW or more. He isa co-investigator on the £6M multi-institution Energy storage for low carbon grids project and the principle investigator on Investigating the power density of power electronics. In 2013 he was a visiting assistant professorat Stanford University in the Murmann mixed-signal group. Dan received hisMEng and PhD degrees from Imperial College London in 2007 and 2011 respectively.

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