UPS FREQUENCY CONVERTER AND LINE CONDITIONER
First Claim
Patent Images
1. A method for controlling a converter, comprising:
- receiving a voltage signal including a ripple voltage;
determining a control signal based in part on the voltage signal by comparing the voltage signal with a reference signal, the control signal including distortion associated with the ripple voltage;
producing an average control signal by filtering at least a portion of the ripple voltage from the control signal;
generating a reference current value based at least in part on the average control signal; and
driving an input current of the converter toward the reference current value.
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Abstract
Systems and methods disclosed herein monitor and control input to a converter in one or more of a UPS, a frequency converter, or a line conditioner. Distortion due at least in part to ripple voltage can be removed from a control signal that controls input current to the converter. The systems and methods described herein afford a simple and effective way to reduce or eliminate one or more of subharmonic oscillation and total harmonic distortion from a converter input current during synchronous and asynchronous modes of operation. The converter may include one or more of a rectifier and an inverter.
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Citations
33 Claims
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1. A method for controlling a converter, comprising:
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receiving a voltage signal including a ripple voltage; determining a control signal based in part on the voltage signal by comparing the voltage signal with a reference signal, the control signal including distortion associated with the ripple voltage; producing an average control signal by filtering at least a portion of the ripple voltage from the control signal; generating a reference current value based at least in part on the average control signal; and driving an input current of the converter toward the reference current value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A converter, comprising:
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an input configured to receive input current; an output configured to provide output current; a control module including a filter; the filter adapted to receive a control signal having distortion associated with a ripple voltage and to produce an average control signal substantially free of the ripple voltage; the control module adapted to generate a reference current value based at least in part on the average control signal; and the control module adapted to drive the input current of the converter toward the reference current value. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A system for controlling an uninterruptable power supply, comprising:
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means for filtering a control signal having distortion associated with a ripple voltage to produce an average control signal substantially free of distortion; a control module associated with the uninterruptable power supply and adapted to generate a reference current value based at least in part on the average control signal; and the control module adapted to drive an input current of the uninterruptable power supply toward the reference current value. - View Dependent Claims (32)
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33. A computer readable medium having stored thereon sequences of instructions including instructions that will cause a processor to control a converter to:
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receive information related to a voltage signal including a ripple voltage; produce an average control signal by filtering at least a portion of the ripple voltage from a control signal; determine the control signal based in part on the voltage signal by comparing the voltage signal with a reference signal, the control signal including distortion associated with the ripple voltage; generate a reference current value based at least in part on the average control signal; drive an input current of the converter toward the reference current value; and apply the input current to a rectifier associated with at least one of an uninterruptable power supply, a frequency converter, and a line conditioner.
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Specification