Quality power from induction generator feeding variable speed motors
a variable speed motor and induction generator technology, applied in the direction of electric generator control, ac network to reduce harmonics/ripples, instruments, etc., can solve the problem of 8% distortion of the 200 kw generated at the utility interface, induction generators have an inherently lower power factor than, and synchronous generators are expensive and require additional controls. , to achieve the effect of improving heat recovery, producing quality power, and not degrading the quality of generated power
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[0014] Referring to FIG. 1, one known system utilizes three-phase diode rectifiers 16 to provide the DC voltage 15 at the input to the IGBT converters 13. The converter controllers 14 respond to signals 21, 22 from a system process controller 23. The controller 23 responds to current and voltage signals 26, 27 indicative of the power generated by the electric power generator 8, including magnitude of power and power factor. The controller 23 also responds to signals 29 from whatever is the prime mover 28, and provides controlling signals 30 to the prime mover. The prime mover may, for instance, be a heat recovery device, such as an organic Rankin cycle heat recovery device.
[0015] The diode rectifiers draw current from the bus 17 in separated pulses of opposite phase, which equates to a highly distorted, semi-sine wave. Inductors 19 cause the current drawn by the rectifiers 16 to be more nearly sinusoidal, but not sufficiently to provide an acceptable waveshape on the bus 17 in orde...
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