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Method And Apparatus For Ripple And Phase Loss Detection

A phase loss and filter technology, applied in the field of ripple and phase loss detection, can solve the problems of noise, slow response speed, low accuracy, etc., and achieve the effect of improving accuracy, timely calculation of harmonic content, and less noise

Active Publication Date: 2014-09-10
ROCKWELL AUTOMATION TECH
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Problems solved by technology

Other techniques involve detection of the instantaneous DC bus voltage and comparing it to upper and lower boundaries, and calculating the average value of the ripple period over a sampling cycle, but these techniques are prone to noise and suffer from low accuracy and slow response

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  • Method And Apparatus For Ripple And Phase Loss Detection
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Embodiment Construction

[0015] 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.

[0016] Methods and apparatus for ripple and phase loss detection in power converters are disclosed, wherein one or more notch (bandpass) filters can be used to check the harmonic content in the DC bus voltage of a power converter for use in To identify phase loss and / or excessive ripple voltage, whereby adverse effects on bus capacitors and other system components can be mitigated or avoided by selectively triggering system alarms and / or faults. Although various concepts of this disclosure are presented in the context of a motor-driven power conversion system 100, the disclosed devices and techniques can be used in any type of power conversion system that uses a DC bus. Furthermore, the detectio...

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Abstract

The invention relates to a method and an apparatus for ripple and phase loss detection. Methods and apparatus are presented for detecting phase loss and / or excessive ripple in a power converter, wherein bandpass filters are used to obtain harmonic voltage amplitudes associated with the power converter DC bus, and phase loss is detected if a ratio of the second harmonic to the sixth harmonic and / or a ratio of the fourth harmonic to the sixth harmonic exceed predetermined threshold values.

Description

technical field [0001] The present disclosure relates to the technical field of power conversion, and in particular to methods and apparatus for ripple and phase loss detection. Background technique [0002] A power conversion system is used to generate and supply AC output power to a load, such as a single-phase or multi-phase AC motor driven by the inverter stage of a motor-driven power converter. Typically a power converter receives AC input power from a three-phase source, and an input rectifier provides a DC bus voltage from which an inverter generates an AC output signal to drive a load. In a voltage source converter, the DC bus or DC link includes one or more capacitors, usually electrolytic capacitors. However, excessive ripple voltage on the DC bus increases the ripple current flowing in the bus capacitor(s), which stresses the electrolytic capacitors, potentially causing overheating and shortened capacitor life. Early detection of excessive DC bus ripple voltage ...

Claims

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Application Information

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IPC IPC(8): H02M5/44G01R31/00G01R29/16
CPCH02M5/4585H02M1/14G01R21/06H02M1/32H02H7/1216H02H7/1255G01R31/42G01R19/2513
Inventor 李冰大卫·莱盖特蒂莫西·罗恩
Owner ROCKWELL AUTOMATION TECH
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