SYSTEMS AND METHODS FOR TUNING THE CONTROL OF A SHUNT ACTIVE POWER FILTER OVER A VARIABLE FREQUENCY
First Claim
1. A shunt active power filter system, comprising:
- a first interface to a source power signal having a selectable frequency;
a set of resonant regulators coupled to the source power signal;
a second interface configured to couple an output power signal from the set of resonant regulators to a load;
a feedback loop, coupled between the source power signal and the set of resonant regulators, having a selectable gain value;
wherein the selectable gain value is selected to dampen a set of harmonics associated with the source power signal at a selected frequency based on a set of closed loop poles of the shunt active power filter system associated with the selected gain value.
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Abstract
Embodiments relate to systems and methods for tuning the control of a shunt active power filter over a variable frequency. In aspects, a shunt active power filter is provided to filter current harmonics from the output delivered to a dc load via a recitifier. The shunt active power filter control can be configured as a set of resonant regulators connected in a parallel configuration. Each of the resonant regulators can be tuned to dampen or eliminate a particular harmonic, such as the 5th, 7th, 11th, 13th, 17th or 19th harmonics. The shunt active power filter can be configured to target those or other harmonics over a range of source voltage frequencies, such as 360-800 Hz. The harmonics can be tuned over that or other source frequency ranges by determining the root locus poles of the filter as a function of feedback loop gain.
10 Citations
16 Claims
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1. A shunt active power filter system, comprising:
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a first interface to a source power signal having a selectable frequency; a set of resonant regulators coupled to the source power signal; a second interface configured to couple an output power signal from the set of resonant regulators to a load; a feedback loop, coupled between the source power signal and the set of resonant regulators, having a selectable gain value; wherein the selectable gain value is selected to dampen a set of harmonics associated with the source power signal at a selected frequency based on a set of closed loop poles of the shunt active power filter system associated with the selected gain value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of generating a power signal, comprising:
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receiving a source power signal in a shunt active power filter; coupling the source power signal to a set of resonant regulators; coupling an output power signal from the set of resonant regulators to a load; coupling the output power signal to the set of resonant regulators via a feedback loop having a selectable gain value; selecting a frequency of the source power signal; selecting the selectable gain value to dampen a set of harmonics associated with the source power signal at the selected frequency based on a set of closed loop poles of the shunt active power filter associated with the selected gain value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification