Electric starter generator system employing bidirectional buck-boost power converters, and methods therefor
First Claim
1. An electric starter generator (ESG) system configured to supply mechanical power to a turbine during a starting operation and configured to transform mechanical power from the turbine to electrical power during a generating operation, said ESG system comprising:
- a synchronous starter generator mechanically coupled to the turbine and configured to supply an alternating current (AC) voltage;
an inverter/rectifier electrically connected to said synchronous starter generator and configured to convert the AC voltage to a DC voltage; and
a bidirectional buck-boost power converter configured to perform each of a plurality of operations;
step up the output voltage during transient operations, step down the output voltage during transient operations, step up the output voltage during steady state operations, and step down the output voltage during steady state operations, such that a DC bus voltage is maintained substantially constant during both steady state and transient operations solely via the bidirectional buck-boost power converter and one or more DC bus link filters.
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Accused Products
Abstract
A bidirectional buck-boost power converter 13 including a pair of inverter modules 14, 15 disposed at an output of a machine, and an inductor Lo connected between the pair of inverter modules 14, 15. A method for controlling a voltage output of a machine starter generator having an inverter rectifier and bidirectional buck-boost converter, includes outputting a dc voltage controlled by bidirectional buck-boost pulse width modulation (PWM) switching control, when the starter generator is in a generator mode.
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Citations
18 Claims
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1. An electric starter generator (ESG) system configured to supply mechanical power to a turbine during a starting operation and configured to transform mechanical power from the turbine to electrical power during a generating operation, said ESG system comprising:
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a synchronous starter generator mechanically coupled to the turbine and configured to supply an alternating current (AC) voltage; an inverter/rectifier electrically connected to said synchronous starter generator and configured to convert the AC voltage to a DC voltage; and a bidirectional buck-boost power converter configured to perform each of a plurality of operations;
step up the output voltage during transient operations, step down the output voltage during transient operations, step up the output voltage during steady state operations, and step down the output voltage during steady state operations, such that a DC bus voltage is maintained substantially constant during both steady state and transient operations solely via the bidirectional buck-boost power converter and one or more DC bus link filters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling a voltage output of a wound field synchronous starter generator having an inverter/rectifier and a bi-directional buck-boost converter, said method comprising:
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outputting a DC voltage based upon a field current when said wound field synchronous starter generator is in a generator mode; and performing a buck-boost operation of the buck-boost converter in a mode selected from a buck-boost converter conduction mode, a buck-boost converter load application mode, a buck-boost converter load rejection mode and a buck-boost converter starting mode such that a DC bus voltage is maintained substantially constant solely via the bi-directional buck-boost converter and one or more DC bus link filters during the conduction mode, the load application mode, the load rejection mode and the starting mode.
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10. A method for controlling a voltage output of an ac starter generator having an inverter/rectifier and bi-directional buck-boost converter, said method comprising;
outputting a dc voltage controlled by a bi-directional buck-boost pulse width modulation (PWM) switching control, when said ac starter generator is in a generator mode, such that a dc bus voltage is maintained substantially constant solely via the bi-directional buck-boost converter and one or more DC bus link filters during a sudden load application or removal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
Specification