DC bus short circuit compliant power generation systems using induction machine
AssigneeHoneywell International Inc.
InventorsEvgeni Ganev, Leroy A. Fizer
Life of this patent
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Abstract
Conventional electric power generation system employ a solid state electronically controlled IM that may be capable of self-start motoring and power generation, but, when the DC bus voltage collapses upon a failure, an additional external source of DC voltage is not available for IM excitation. The present invention provides an internal bus that does not collapse when the main DC bus is shorted. This internal or auxiliary bus may be used to excite the IM to provide generation function. The power generation systems of the present invention may play a significant role in the modern aerospace and military industries.
Claims20
A power generation system comprising:
- an induction machine;
- a first induction machine winding;
- a second induction machine winding;
- an excitation bridge electrically connected to the second induction machine winding;
- a main rectifier electrically connected to the first induction machine winding;
- a diode electrically connecting the excitation bridge and the main rectifier, the diode being biased in reverse polarity during a short circuit;
- and
- a permanent magnet machine supplying AC power to a rectifier bridge, the rectifier bridge converting the AC power from the permanent magnet machine to deliver DC power to the excitation bridge, wherein a DC bus of the rectifier bridge does not collapse during a short circuit of the main rectifier.
A power generation system comprising:
- an induction machine;
- a first induction machine winding;
- a second induction machine winding;
- an excitation bridge electrically connected to the second induction machine winding;
- a main rectifier electrically connected to the first induction machine winding;
- a first diode electrically connecting the excitation bridge and the main rectifier, the diode being biased in reverse polarity during a short circuit, wherein a secondary bus is maintained during the short circuit;
- and
- a switch, the main rectifier supplying a short circuit current to a main DC bus when the switch is closed, and the main rectifier supplying current to the excitation bridge when the switch is open.
A power generation system comprising:
- an induction machine;
- an induction machine winding;
- a combined excitation and rectification bridge;
- a secondary bus that remains charged during a short circuit condition;
- and
- a switch, the switch supplies a short circuit current to a main DC bus when closed, and the switch maintaining the secondary bus at a desired voltage when open.
Dependencies are inferred from the claim text.