Conference Paper

Light flicker of fluorescent lamps with different types of ballasts caused by interharmonics

Brno Univ. of Technol., Brno
DOI: 10.1109/PTC.2005.4524419 Conference: Power Tech, 2005 IEEE Russia
Source: IEEE Xplore

ABSTRACT The paper presents an analysis of the voltage fluctuations caused by interharmonics and its influence on luminous flux fluctuations of used combinations of fluorescent lamps and ballasts. One of the analysis results is a concept determining light sources sensitivity to such disturbing type based on frequency components utilization. Further a complex measured data file of sensitivity curves in various combinations of fluorescent lamps and ballasts are pointed. Measured and compared combinations include various types of fluorescent lamps, various wattages, modes of operation of the ballast and its specific designs and dimensioning of circuit elements etc.

  • [Show abstract] [Hide abstract]
    ABSTRACT: The paper is focused on evaluation of flicker produced by various lamp types as consequence of a Ripple Control Signal (RCS) presence in supply voltage. On the basis of observations the resulting flicker severity differs from values measured according to the EN 61000-4-15 standard and moreover is very variant; depending i.a. on the RCS parameters and on the lamp type used in installation. Considering that the RCS transmitted as telegram carrying information (command) is generally a periodical signal, a specialized testing system utilizing a light flickermeter has been developed and used for the flicker severity assessment and obtained results “objectively” comparing measured lamps response are presented in the paper.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The paper is focused on realization and verification of a light-flickermeter simulating response of the average observer on disturbing light flicker under specific condi-tions. The design of the light-flickermeter is based on digi-tized the standard UIE/IEC flickermeter measuring scheme where the measuring chain does not include model of the reference incandescent bulb. It means that this type of flick-ermeter output is expected to be independent on a light source type producing light flicker. The developed instru-ment evaluates measured luminous flux fluctuation utilizing appropriate hardware and signal processing. The light is sensed by a photodiode with build-in transimpedance am-plifier and photopic correction light-filter. The amplifier RC feedback allows control of its transfer function gain and bandwidth. Then the subsequent signal processing is based on NI PXI (cDAQ or cRIO) platform and virtual instrumen-tation in LabView. For purpose of various type flickerme-ters verification and calibration, a test system composed of a SW designed in LabView, NI PXI arbitrary waveform generation board, a power amplifier and a lamp placed in a test chamber, allowing generation of testing signals, has been developed. And finally, results of the light-flickermeter advanced performance analysis are shown and discussed.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Flicker phenomenon, as a power quality component, can be measured by the standard IEC flickermeter that has been widely accepted as an international standard for flicker severity measurement. In industry applications, the standard IEC flickermeter suffers from some deficiencies. Among them, it is unable to measure flickers caused by interharmonics whose frequencies are higher than 85Hz. It also is unable to measure the effect of the various lamp flickers. In addition, it is unable to determine direction of flicker source with respect to a monitoring point. In this paper, these deficiencies are improved respectively by designing an improved filter, using the border graph of gain factor of various lamps and by using flicker power to determine direction of a flicker source. At the end, the proposed flickermeter is evaluated in a simulated system, that its flicker source is a welding system.