Segmented waveform converter on controlled field variable speed generator
First Claim
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1. An apparatus comprising:
- a controlled field alternator configured to generate a polyphase signal including a first component and a second component;
a segmented waveform converter including a plurality of switches connected between the polyphase signal of the controlled field alternator and an output filter; and
a controller configured to calculate a plurality of combinations of available voltages through combinations of phase components of the polyphase signal through different settings for the plurality of switches, and access a target waveform, wherein, in response to the target waveform and measurements of an output at the output filter having an output frequency, the controller is configured to select one of the plurality of combinations of phase components to provide a control signal having piecewise segments at a predetermined frequency to provide a field current control signal to the controlled field alternator, wherein the predetermined frequency is greater than the output frequency.
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Abstract
A generator or another type machine includes a controlled field alternator, a segmented waveform converter, and a controller. The controlled field alternator is configured to generate a polyphase signal. The segmented waveform converter includes multiple switches connected between the polyphase signal of the controlled field alternator and an output filter. The controller is configured to provide a control signal for the switches based on measured electrical quantities associated with the output filter and provide a field current control signal to the controlled field alternator.
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Citations
16 Claims
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1. An apparatus comprising:
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a controlled field alternator configured to generate a polyphase signal including a first component and a second component; a segmented waveform converter including a plurality of switches connected between the polyphase signal of the controlled field alternator and an output filter; and a controller configured to calculate a plurality of combinations of available voltages through combinations of phase components of the polyphase signal through different settings for the plurality of switches, and access a target waveform, wherein, in response to the target waveform and measurements of an output at the output filter having an output frequency, the controller is configured to select one of the plurality of combinations of phase components to provide a control signal having piecewise segments at a predetermined frequency to provide a field current control signal to the controlled field alternator, wherein the predetermined frequency is greater than the output frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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generating a polyphase signal at a controlled field alternator, the polyphase signal including a first phase component and a second phase component; calculating a plurality of combinations of available voltages through combinations of the first phase component and the second phase component of the polyphase signal; accessing a target waveform from memory; selecting, in response to the target waveform and measured electrical quantities associated with an output having an output frequency, one of the plurality of combinations of phase components; determining an output control signal including segments based on a predetermined frequency to control a plurality of switches connected between the polyphase signal of the controlled field alternator and the output, wherein the predetermined frequency is greater than the output frequency; and determining a field current control signal including the selected one of the plurality of combinations of phase components to control a field current of the controlled field alternator. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus comprising:
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a segmented waveform converter including a plurality of switches connected between the polyphase signal of a controlled field alternator and an output filter providing an output at an output frequency; a memory including a lookup table associating a plurality of combinations of the plurality of switches with available voltage levels; and a controller configured to provide a control signal for the plurality of switches based on measured electrical quantities associated with the output filter and provide a field current control signal to the controlled field alternator based on a combination of the plurality of switches, wherein the field current control signal includes segments at a predetermined frequency that is greater than the output frequency.
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Specification