Method of controlling a stand-alone electrical generator, in particular for aircraft
First Claim
1. A method of controlling a stand-alone electrical generator including an asynchronous rotating machine whose wound rotor is driven mechanically at a particular voltage and with a particularly frequency, a stator and said rotor being excited by an inverter controlled by a pulse width modulation control circuit and supplied by a constant DC voltage source, said method comprising the steps of:
- generating a signal representing a stator frequency set point, generating a signal representing a rotor frequency set point, as a function of the stator frequency set point and a rotation speed of said machine, generating a signal representing a stator voltage rms set point value, generating an error signal as a function of a difference between said stator voltage rms set point value and a rms value of an actual stator voltage, and imposing on said control circuit a rotor voltage set point which is a function of said error signal and said rotor frequency set point.
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Accused Products
Abstract
The generator includes an asynchronous machine with a wound rotor driven mechanically and a stator connected to the network. The rotor is excited by a constant DC voltage source via an inverter controlled by a pulse width modulation control circuit. In accordance with the invention, the following are generated: a stator frequency set point, a rotor frequency set point which is a function of the stator frequency set point and the rotation speed of the machine, an rms stator voltage set point, an error signal which is a function of the difference between the rms stator voltage set point and the actual rms stator voltage. A rotor voltage set point is imposed on the control circuit which is a function of the error signal and the rotor frequency set point.
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Citations
35 Claims
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1. A method of controlling a stand-alone electrical generator including an asynchronous rotating machine whose wound rotor is driven mechanically at a particular voltage and with a particularly frequency, a stator and said rotor being excited by an inverter controlled by a pulse width modulation control circuit and supplied by a constant DC voltage source, said method comprising the steps of:
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generating a signal representing a stator frequency set point, generating a signal representing a rotor frequency set point, as a function of the stator frequency set point and a rotation speed of said machine, generating a signal representing a stator voltage rms set point value, generating an error signal as a function of a difference between said stator voltage rms set point value and a rms value of an actual stator voltage, and imposing on said control circuit a rotor voltage set point which is a function of said error signal and said rotor frequency set point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of controlling a stand-alone electrical generator including an asynchronous rotating machine whose wound rotor is driven mechanically at a particular voltage and with a particular frequency, a stator, and said rotor being excited by an inverter controlled by a first pulse width modulation control circuit and supplied by a constant DC voltage source, said method comprising the steps of:
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generating a signal representing a stator frequency set point, generating a signal representing a rotor frequency set point, as a function of the stator frequency set point and a rotation speed of said machine, generating a signal representing a stator voltage rms set point value, generating an error signal as a function of a difference between said stator voltage rms set point value and a rms value of an actual stator voltage, imposing on said control circuit a rotor voltage set point which is a function of said error signal and said rotor frequency set point, generating said constant DC voltage source by an auxiliary alternator and a second pulse width modulation control circuit connected thereto, operating said auxiliary alternator in an electrical motor mode, when a slip of said asynchronous rotating machine is negative, and operating said auxiliary alternator in an electrical generator mode, when a slip of said asynchronous rotating machine is positive. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification