AC POWER SUPPLY APPARATUS AND METHODS PROVIDING OUTPUT CONTROL BASED ON ESTIMATED INSTANTANEOUS REACTIVE POWER
First Claim
1. An AC power supply, comprising:
- an output;
a reference signal generator circuit operative to generate a reference signal representative of a desired voltage waveform at a node connected to the output;
a power determiner circuit operative to generate an estimate of instantaneous reactive power transferred between the output and the node;
a reference signal compensator circuit responsive to the reference signal and to the power determiner circuit and operative to generate a compensated reference signal from the reference signal responsive to the estimate of instantaneous reactive power; and
an AC voltage generator circuit responsive to the reference signal compensator and operative to transfer current between the output and the node responsive to the compensated reference signal.
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0 Petitions
Accused Products
Abstract
An AC power supply, e.g., an uninterruptible power supply (UPS), includes an output, a reference signal generator circuit operative to generate a reference signal representative of a desired voltage waveform at a node connected to the output, a power determiner circuit operative to generate an estimate of instantaneous reactive power transferred between the output and the node, and a reference signal compensator circuit responsive to the reference signal generator circuit and to the power determiner circuit and operative to generated a compensated reference signal from the reference signal responsive to the estimate of instantaneous reactive power. An AC voltage generator circuit is responsive to the reference signal compensator and operative to transfer current between the output and the node responsive to the compensated reference signal. For example, the AC voltage generator circuit may include a controlled inverter that includes an output voltage control loop that receives the compensate reference signal at a reference input thereof. Related methods are also described.
11 Citations
45 Claims
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1. An AC power supply, comprising:
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an output;
a reference signal generator circuit operative to generate a reference signal representative of a desired voltage waveform at a node connected to the output;
a power determiner circuit operative to generate an estimate of instantaneous reactive power transferred between the output and the node;
a reference signal compensator circuit responsive to the reference signal and to the power determiner circuit and operative to generate a compensated reference signal from the reference signal responsive to the estimate of instantaneous reactive power; and
an AC voltage generator circuit responsive to the reference signal compensator and operative to transfer current between the output and the node responsive to the compensated reference signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21)
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18. An AC power supply, comprising:
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an output;
means for generating a reference signal representative of a desired voltage waveform at a node connected to the output;
means for generating a compensated reference signal from the reference signal responsive to an estimate of instantaneous reactive power transferred between the output and the node; and
means for controlling current transfer between a power source and the node via the output responsive to the compensated reference signal.
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22. An uninterruptible power supply (UPS), comprising:
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a DC voltage generating circuit configured to connect to an AC power source and to an auxiliary power source and operative to produce a DC voltage circuit at a DC bus from the AC power source and/or the auxiliary power source;
a controlled inverter coupled to the DC bus and operative to produce an AC voltage at an output thereof from the DC voltage on the DC bus responsive to a signal applied to a reference input of the controlled inverter;
a reference signal generator circuit operative to generate a reference signal representative of a desired voltage waveform at a node connected to the output of the controlled inverter;
a power determiner circuit operative to generate an estimate of instantaneous reactive power transferred between the output of the inverter and the node; and
a reference signal compensator circuit responsive to the reference signal generator circuit and to the power determiner circuit and operative to generate a compensated reference signal at the reference input of the controlled inverter from the reference signal responsive to the estimate of instantaneous reactive power. - View Dependent Claims (23, 24, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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26. A method of operating an AC power supply, the method comprising:
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generating a reference signal representative of a desired voltage waveform at a node connected to an output of the AC power supply;
modifying the reference signal responsive to an estimate of instantaneous reactive power transferred between the output and the node to generate a compensated reference signal; and
controlling current transfer between the output and the node responsive to the compensated reference signal.
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Specification