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 Title: |
US6657322:
Control system for active power filters
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Skibinski, Gary Leonard; Milwaukee, WI
Zhou, Dongsheng; Cedarburg, WI
Hoadley, Frederick Louis; Mequon, WI
Li, Naihu; Shanghai, China
Yin, Qiang; Shanghai, China
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| Assignee: |
Rockwell Automation Technologies, Inc., Mayfield Heights, OH
other patents from ROCKWELL AUTOMATION TECHNOLOGIES, INC. (788148) (approx. 97)
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| Published / Filed: |
2003-12-02
/ 2001-10-01
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| Application Number: |
US2001000968114
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| IPC Code: |
Advanced:
H02J 3/18;
Core:
more...
IPC-7:
G05F 1/70;
H02M 1/12;
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| ECLA Code: |
H02J3/18C3A;
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| U.S. Class: |
307/105;
363/089;
323/207;
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| Field of Search: |
307/105
363/089,44,84,47,39,40,71
323/207,205
327/552
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| Priority Number: |
| 2001-10-01 |
US2001000968114 |
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| Abstract: |
An active filter controller for use with both pure and hybrid shunt filters wherein the controller maintains a minimum DC bus voltage required to generate a compensating current on coupling lines and also extrapolates to estimate an expected feedback current to be compensated so that compensation currents are more accurate and harmonic currents are appreciably reduced.
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| Attorney, Agent or Firm: |
Quarles & Brady LLP ;
Gerasimow, Alexander M. ;
Walbrun, William R. ;
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| Primary / Asst. Examiners: |
Toatley, Jr., Gregory J.;
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| INPADOC Legal Status: |
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| Family: |
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First Claim:
Show all 20 claims |
What is claimed is:
1. A filter for eliminating harmonic currents from three phase AC supply lines, the AC lines providing actual voltage waveforms and corresponding actual current waveforms including fundamental components and harmonic components flowing through the lines connected to a load, the actual voltage waveforms characterized by a peak value the filter comprising:
- current sensors linked to the lines to provide three phase current signals indicating the actual line current waveforms;
- a compensator for providing compensating harmonic signals on the lines as a function of control signals, the compensator including a DC bus voltage source that is charged by current sinked from the lines, the DC source characterized by a minimum charge value that is greater than the peak value;
- a voltage sensor linked to the DC bus voltage source to provide a voltage signal indicating the DC bus voltage; and
- a controller for generating the control signals as a function of the actual line current waveforms and the DC voltage difference where the DC voltage difference is the difference between the DC bus voltage and the minimum charge value.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 3 U.S. patent(s) that reference this one
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