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Article | REF: D3336 V1

Ultracapacitors and power electronic systems

Author: Michel PINARD

Publication date: November 10, 2012

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1. Principle of electrical energy storage

1.1 Storage in passive elements

Storing electrical energy in passive elements requires confined fields in limited volumes:

  • the magnetic excitation fieldH in the space inside a magnetic circuit of a coil; the stored volumetric energy v (in J · m –3 ) is then :

    ϖ=1/2  μr μ0 H2

    with :

    ...
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Principle of electrical energy storage
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