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Filter capacitor degradation detection device and method

A filter capacitor and filter circuit technology, applied in the field of filter capacitor degradation detection devices, can solve problems such as heavy loss of filter capacitor downtime, filter circuit damage or degradation by filter capacitor, and input filter capacitor performance evaluation.

Active Publication Date: 2016-05-18
ROCKWELL AUTOMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such LC or LCL filter circuits are subject to damage or degradation of filter capacitors
Failure of filter capacitors can be costly in terms of replacement component cost, labor for inspection and replacement, and downtime of the power conversion system and any associated machinery
However, performance and any degradation in input filter capacitors has been difficult to assess and initial capacitor degradation has not been possible to identify visually by service personnel

Method used

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  • Filter capacitor degradation detection device and method
  • Filter capacitor degradation detection device and method
  • Filter capacitor degradation detection device and method

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Embodiment Construction

[0023] Referring now to the drawings, several embodiments or implementations are described hereinafter 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.

[0024] figure 1 A power conversion system 2 is shown comprising a pre-charging circuit 10 , an LCL or LC input filter circuit 20 , an active front end (AFE) rectifier 30 , a DC link circuit 40 , an inverter 50 and a controller 60 . The power conversion system 2 receives multi-phase AC input power from a power source 4 and provides AC output power to a single-phase or multi-phase load 6 such as an electric motor. The power conversion system 2 includes an AC input 3 coupleable to receive AC input power from a power source 4 , and an inverter 50 provides an AC output 52 to drive a load 6 . In some embodiments, the power conversion system is a current source converter (CSC) system having an LC filt...

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Abstract

The present application discloses a filter capacitor degradation detection device and method. A power conversion system is proposed for detecting input filter capacitor degraded or near-end of life terminals based on filter capacitor current measurements, using single threshold and / or dual threshold comparisons with respect to the instantaneous sum of squares of the calculated filter current or power values, and method.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 61 / 640,398, entitled "LCLFILTERCAPACITORFAILUREDETECTIONVIACURRENTMEASUREMENT," filed April 30, 2012, the entire contents of which are incorporated by reference into In this application. technical field [0003] The present disclosure relates to a filter capacitor degradation detection device and method. Background technique [0004] Motor drives, as well as other power conversion systems, operate using power from an AC source and often include an input filter to reduce switching noise associated with the operation of the power converter, especially to control the power generated by certain active front-end (AFE) The total harmonic distortion (THD) generated by the high frequency operation of the rectifier. In particular, many power conversion systems utilize inductor-capacitor (LC) or inductor-capacitance-inductance (LCL) input filter circui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/44G01R31/00
CPCG01R31/42H01G4/40H02M1/126H02M1/32H02M5/4585G01R31/64
Inventor 凯文·L·鲍曼马丁·D·博尔约格什·波帕特拉尔·帕特尔拉塞尔·J·克尔克曼布赖恩·J·塞贝尔韦立祥
Owner ROCKWELL AUTOMATION TECH