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Old 02-06-2019, 03:34 AM   #4834 (permalink)
RedDevil
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Quote:
Originally Posted by freebeard View Post
Re: The discussion for the last few hours about vehicle-to-grid.

I made a post a while back, found it and pointed to it again, but I can't find it now so here's this:

https://duckduckgo.com/?q=software%20defined%20electricity

Software Defined Electricity uses real time data sliced very finely to modulate the grid with, ideally, super capacitors. Rather than a centralized solution it would be distributed and used to suppress local spikes in demand. Acting in concert this would calm the grid so that a backup power plant isn't triggered repeatedly.

This would extend to the vehicles being able to contribute not by not draining the battery back to grid, but by modulating the recharge rate enmass.

Given the nano-second response time required , everybody gets new hardware. I read the Tesla bought the supercapacitor company for some 'dry electrode' technology they hold.
The best option for both grid storage and cars is a combination of caps and batteries.

Imagine an EV with 40 kWh of batteries and 10kWh of supercaps. Way less total capacity than a 80 kWh battery pack. But you could add 10 kWh in a minute, drive a bit while the car charges its battery from the ultracaps, then take another blitz charge, etc until you have enough combined range to reach your destination. You can do a road trip and hardly lose any time charging, and do that at random locations as long as those are well within the battery range.
Every blitz charge adds 20% to the range (assuming the ultracaps are drawn empty).

At conventional fast chargers it would work the other way round. As long as the batteries can take its full output all goes into the battery, once that gets too hot the remainder charges the caps so the car uses maximum charge current until the caps are full.

In driving the ultracaps would do the bulk of the high current demand like accelerating and regenerative braking.
The battery would need way less cooling and could therefore be cheaper and lighter.
Tesla may have a winner strategy here.
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