VSCF system with voltage estimation
First Claim
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1. An AC electric power generating system producing an AC output waveform comprising:
- a source of DC power;
a DC-to-AC power inverter having a DC input and an AC output, said DC-to-AC power inverter comprising switching means for switchably coupling said DC input to said AC output producing said AC output waveform thereby;
a control unit for controlling said DC-to-AC power inverter;
a DC link conductor electrically connecting said source of DC power and said DC-to-AC power inverter DC input, said DC-to-AC power inverter converting said DC power to AC power and producing said AC output waveform at said inverter output;
means for sensing a parameter of DC power on the DC link conductor;
means coupled to the DC sensing means and responsive to the parameter of DC power on the DC link conductor for developing an estimate signal representing an estimated magnitude of the AC output waveform;
means for providing a direct feed back of a parameter of said AC output waveform; and
means directly coupled to said feed back means and responsive to said estimate signal for deriving a correction signal representing a correction to said estimate signal, and wherein said control unit is responsive to said estimate signal.
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Abstract
A voltage estimator for a generating system having a DC link and an inverter detects the magnitudes of the voltage and current on the DC link and develops an estimate signal representing the estimated magnitude of a fundamental component of output voltage developed by the inverter from the sensed DC voltage and current magnitudes.
31 Citations
21 Claims
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1. An AC electric power generating system producing an AC output waveform comprising:
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a source of DC power; a DC-to-AC power inverter having a DC input and an AC output, said DC-to-AC power inverter comprising switching means for switchably coupling said DC input to said AC output producing said AC output waveform thereby; a control unit for controlling said DC-to-AC power inverter; a DC link conductor electrically connecting said source of DC power and said DC-to-AC power inverter DC input, said DC-to-AC power inverter converting said DC power to AC power and producing said AC output waveform at said inverter output; means for sensing a parameter of DC power on the DC link conductor; means coupled to the DC sensing means and responsive to the parameter of DC power on the DC link conductor for developing an estimate signal representing an estimated magnitude of the AC output waveform; means for providing a direct feed back of a parameter of said AC output waveform; and means directly coupled to said feed back means and responsive to said estimate signal for deriving a correction signal representing a correction to said estimate signal, and wherein said control unit is responsive to said estimate signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A voltage estimator for an AC electric power generating system that produces an AC output voltage wherein the AC output voltage includes a fundamental component at a fundamental frequency and an additional component at a frequency other than the fundamental frequency and wherein the AC electric power generating system includes a source of DC power producing DC current and voltage on a DC link and a DC-to-AC power inverter that produces the AC output voltage comprising:
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first and second means for sensing the DC voltage and current on the DC link; means for providing a direct feed back of the AC output voltage; first and second means coupled to the first and second DC sensing means and responsive to the sensed DC current and DC voltage for developing an estimate signal representing the estimated magnitude of the fundamental component of the AC output voltage; and means directly coupled to said feed back means and responsive to said estimate signal for deriving a correction signal representing a correction to said estimate signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification