Active filter for multi-phase AC power system
AssigneeHoneywell International Inc.
InventorsLouis Cheng, Qihua Zhao
Life of this patent
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Abstract
An active filter (300) generates multi-phase compensating current in an AC power supply system (10) that supplies a load (200). The filter (300) includes a compensating current output device (34) outputting multi-phase compensating current to an AC power line (50); and a controller (310) for controlling the compensating current output (340) such that the multi-phase compensating current compensates for current harmonics and power factor on said AC power line (50). The controller (310) estimates current harmonics and power factor compensating values as a function of multi-phase power measurements.
Claims34
An active filter for generating multi-phase compensating current in an AC power supply system that supplies a load, said filter comprising:
- a compensating current output device outputting multi-phase compensating current to an AC power line;
- and
- a controller for controlling said compensating current output device without using a transformer such that the multi-phase compensating current compensates for current harmonics and power factor on said AC power line, said controller estimating current harmonics and power factor compensating values as a function of multi-phase power measurement.
An active filter for generating multi-phase compensating current in an AC power supply system that supplies a load, said filter comprising:
- a compensating current output device outputting multi-phase compensating current to an AC power line;
- and
- a controller for controlling said compensating current output such that the multi-phase compensating current compensates for current harmonics and power factor on said AC power line, said controller estimating current harmonics and power factor compensating values as a function of multi-phase power measurement,
- wherein said controller comprises:
- a digital phase lock loop unit that computes voltage reference signals in a quadratic domain.
A controller of an active filter that generates multi-phase compensating current in an AC power supply system that supplies a load, said controller comprising:
- an input for receiving multi-phase power measurements;
- a compensating current calculation unit for calculating multi-phase compensating current based on said multi-phase power measurements;
- and
- an output for outputting control signals based on the calculated multi-phase compensating current to control a compensating current output device to compensate for current harmonics and power factor on an AC power line without using a transformer.
A controller of an active filter that generates multi-phase compensating current in an AC power supply system that supplies a load, said controller comprising:
- an input for receiving multi-phase power measurements;
- a compensating current calculation unit for calculating multi-phase compensating current based on said multi-phase power measurements;
- and
- an output for outputting control signals based on the calculated multi-phase compensating current to control a compensating current output device to compensate for current harmonics and power factor on an AC power line,
- wherein said compensating current calculation unit comprises:
- a digital phase lock loop unit that computes voltage reference signals in a quadratic domain.
A method of generating multi-phase compensating current in an AC power supply system that supplies a load, said method comprising:
- outputting multi-phase compensating current to an AC power line without using a transformer;
- and
- adjusting the compensating current output to the AC power line without using a transformer such that the multi-phase compensating current compensates for current harmonics and power factor on the AC power line, said adjusting step estimating current harmonics and power factor compensating values as a function of multi-phase power measurement.
The method of generating multi-phase compensating current in an AC power supply system that supplies a load, said method comprising:
- outputting multi-phase compensating current to an AC power line;
- and
- adjusting the compensating current output to the AC power line such that the multi-phase compensating current compensates for current harmonics and power factor on the AC power line, said adjusting step estimating current harmonics and power factor compensating values as a function of multi-phase power measurement,
- wherein said step of adjusting comprises:
- executing a digital phase lock loop function that computes voltage reference signals in a quadratic domain.
Dependencies are inferred from the claim text.