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Notes:
As long as the voltage hold up OK, (no
close-in faults) the "power electronics." then those electronics can inject
current leading the voltage to act like a capacitor and supply magnetizing
current to the system--in a static state (no induction-generator rotors
turning.)
Some notes from a related posting... In the mid 1990s, a Northern
California company [Kenetech/US Wind...now defunct] was working on
a Variable Frequency Drive-like assembly to couple wind-powered induction
generators to the 60Hz utility system. The intent was to make better use of
varying wind speed for electricity production. They also claimed that the
drive could potentially eliminate the need for external reactive-power
support (i.e., capacitor banks); that is, the line side of the drive could
be controlled to operate near unity power factor over a wide range of
generator capability.
A related term for '4-quadrant' is 'regenerative.' Q.I -- watts out/vars out. [induction-generator 'default' operation] Q.II -- watts in/vars out. [a 'static' drive condition that would be able to offset other Q.IV-running induction generators] Q.III -- watts in/vars in. [induction-motor 'default' operation] Q.IV -- watts out/vars in. [induction-generator 'default' operation] |