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Method and apparatus for detecting AFE filter capacitor degradation

A filter capacitor and input filter technology, which is applied in measuring devices, capacitor testing, output power conversion devices, etc., can solve the problems of unrecognizable capacitor degradation, high cost of filter capacitors, and evaluation of input filter capacitor performance and any degradation, etc. question

Inactive Publication Date: 2015-04-15
ROCKWELL AUTOMATION TECH
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Problems solved by technology

Deterioration of filter capacitors can in turn result in higher costs in terms of: replacement part cost; labor for inspection and replacement; and downtime of the power conversion system and any associated machinery
Previously, evaluating the performance and any degradation of input filter capacitors has been difficult, and initial capacitor degradation may not have been identified by visual inspection by service personnel

Method used

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  • Method and apparatus for detecting AFE filter capacitor degradation
  • Method and apparatus for detecting AFE filter capacitor degradation
  • Method and apparatus for detecting AFE filter capacitor degradation

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Embodiment Construction

[0015] Referring now to the drawings, several embodiments or implementations are hereinafter described in conjunction with the drawings, wherein like reference numerals are used to refer to like elements throughout and wherein the various features are not necessarily drawn to scale. Techniques and apparatus for detecting degradation of power conversion system filter capacitors are disclosed, which provide utility associated with active front end (AFE) motor drives, as well as other forms of power conversion systems. Furthermore, although described in the context of a three-phase input device, the disclosed concepts can be used with any number of input phases in a power conversion system in which the input filter includes at least one delta-shaped or Y-connected filter capacitor circuit or bank. Furthermore, the concepts of the present disclosure may be used in conjunction with voltage source converters and current source converters.

[0016] First refer to figure 1 and fig...

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Abstract

Methods and systems are disclosed for detecting capacitor degradation in an input filter of an active front end power conversion system in which voltage and current sensing is performed to determine sequence component impedance asymmetry to detect filter capacitor degradation according to the value of an off-axis admittance matrix component for Delta or Y-connected filter capacitor banks without sensitivity to voltage unbalance, and with the capability to identify particular degraded capacitor locations based on individual impedance values.

Description

Background technique [0001] A power conversion system converts input power from one form to another for driving a load. Motor drives and other power conversion systems operate using power from an alternating current (AC) source, and they often include input filters for reducing switching noise associated with the operation of the power converter, especially for The total harmonic distortion (THD) generated by the high frequency operation of the active front end (AFE) rectifier is controlled. In particular, many power conversion systems utilize an inductor-capacitor (LC) input filter circuit or an inductor-capacitor-inductor (LCL) input filter circuit associated with each AC input to control the Harmonic content. Such filter circuits can be subject to damage or degradation of filter capacitors, for example by voltage surges. Deterioration of the filter capacitors, in turn, can incur higher costs in terms of: replacement part costs; labor for inspection and replacement; and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCH02M7/125G01R27/00H02M5/4585G01R31/42G01R31/028H02M5/452G01R31/64H02M1/126
Inventor 兰加拉詹·塔拉姆拉塞尔·克尔克曼
Owner ROCKWELL AUTOMATION TECH
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