Self-excited controlled frequency generator system with bi-directional converter
First Claim
1. A controlled frequency generating system (CFG) comprising:
- a main generator;
an exciter driven by a shaft common with the main generator;
a bi-directional controller that extracts excitation power from an output of the main generator when the CFG operates at a rotational speed at which supplemental power input to the exciter is required; and
the bi-directional controller extracts power from the exciter when the main generator operates at a rotational speed at which the exciter produces power in excess of excitation requirements.
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Accused Products
Abstract
A controlled frequency generating system (CFG) may be constructed with a main generator and an exciter driven by a common shaft. Excitation power may be provided from the common shaft; as distinct from prior-art systems which may require independent excitation power sources. While controlling the output voltage and frequency of the main generator, the bi-directional controller extracts power from a main generator output and may supply the extracted power to supplement excitation power when needed at certain rotational speeds. The controller may extract power from the exciter when, at other rotational speeds, the exciter produces excess power. The extracted excess power may be delivered to the output of the main generator to maintain a desired level of output power at a desired frequency, irrespective of speed of rotation of the CFG.
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Citations
20 Claims
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1. A controlled frequency generating system (CFG) comprising:
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a main generator; an exciter driven by a shaft common with the main generator; a bi-directional controller that extracts excitation power from an output of the main generator when the CFG operates at a rotational speed at which supplemental power input to the exciter is required; and the bi-directional controller extracts power from the exciter when the main generator operates at a rotational speed at which the exciter produces power in excess of excitation requirements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A controller for maintaining a desired level of excitation in a controlled frequency generator system (CFG), the controller comprising:
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a first inverter interconnected with stator windings of a main generator of the CFG; and a second inverter interconnected with stator windings of an exciter of the CFG, the inverters being interconnected to bi-directionally transfer energy between the exciter stator windings and the main generator stator windings. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for generating electrical power at a controlled frequency comprising the steps of:
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driving an exciter and a main generator with a common shaft; determining, on the basis of rotational speed of the shaft, a proper level of excitation required to maintain a desired frequency and voltage magnitude; and directing a portion of electrical power generated by the main generator power to provide supplementary excitation power when a rotational speed produces excitation power that is less than the desired level of excitation. - View Dependent Claims (18, 19, 20)
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Specification