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Mike Everett

All Aboard Energy-Efficient Rail Transportation

Mike Everett
Jean Luc.Suchail
Jean Luc.Suchail
9/16/2015 10:40:58 AM
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Artist
Re: Regenerative braking
There was already a paper on regenerative breaking for commuting railways published in GEC review 25 years ago by RL Mc Naughton. Using supercaps is an add on to regeneration storing energy locally. Maybe higher efficiency. Hbrid buses use ultracaps as they cannot regenerate inside the grid....

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David Ashton
David Ashton
9/12/2015 8:53:03 PM
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Energy-Efficient Rail Transportation
Couldn't agree more.  I'd agree with the above comment on regenerative braking but this (a) needs another load to use the power and (b) there are losses through the system if there are no other loads nearby.  So Ultracapacitors are a good solution, store the power locally.

I had no idea ultracapacitors were anywhere near ready for this sort of bulk energy storage, but from your link it seems they are - figures of 10-20% efficiency improvement are given, not to be sneezed at.  They also mention Solar energy firming, surely a huge market for this technology.

Our Government (Australia) is always on about how renewable energy cannot supply base load (so we need to keep mining coal...)  A bit more development of this technology and it will be able to do so.  Bring it on!

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52634
52634
9/11/2015 3:17:54 PM
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Newbie
Regenerative braking
Isn't this already available via a bi-directional power conversion topology that can take the energy from the motor, now acting as a generator, to supply energy back into the power distribution system.

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More Blogs from Mike Everett
Many engineers want to know if ultracapacitors will ultimately replace all batteries. The answer is, no. A typical follow-up question is, “Will the ultracapacitor replace some batteries?” and here the answer is, “yes.” While this may not seem like a revelation, the significance is in the manner ultracapacitors will replace some batteries.
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Just as the battery energy storage has evolved and established its top players, the ultracapacitor will also face a shakeup that only the strong will survive.
Specifications and standards are essential in the energy storage market for establishing the integrity of the purchasing and integration process. But, they seem hard to come by in this industry.
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