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IEEE PowerTech 2017

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Tutorial 3: Voltage Fluctuations and Light Flicker in Modern Electrical Power Systems - Block 2

Sunday, 18 June 2017
11:00 - 12:30

Room 1.219

Organiser(s)Roberto Langella, Università degli Studi della Campania “Luigi Vanvitelli”, Italy

Speaker(s)Alfredo Testa, Università degli Studi della Campania “Luigi Vanvitelli”, Italy; Roberto Langella, Università degli Studi della Campania “Luigi Vanvitelli”, Italy; Jiri Drapela, Brno University of Technologies, Czech Republic

Abstract. Voltage fluctuations (VF) can be described as repetitive or random variations of the voltage envelope due to sudden changes in the real and reactive power drawn by a load; their characteristics depend on the load type and size and the power system capacity. The aim of the tutorial is to give basic concepts to understand causes and effects of VF with particular attention to their main effect that is Light Flicker (LF). LF is produced by the fluctuations on the luminous flux emitted by the lamps when fed by a fluctuating voltage. For historical reasons, the instrument aimed to measure LF, known as Flickermeter, was designed in the early seventies starting from epidemiological studies conducted using incandescent lamps. Today, the scenario is totally different, in fact in some countries incandescent lamps are only a small fraction among the different other technologies (CFLs, LED, …) and are destined to be banned in the future.

The tutorial is organized as follows. Firstly, basic definitions on VF will be given and a quick overview on their causes and effects will be done. Afterwards, effects different from LF (e.g. transformers and AC motors reduction of useful life, excitation of turbo-generators shaft mechanical resonances, PLL inaccuracies, …) will be briefly recalled and analyzed. Then, after an initial recall on the LF phenomenon produced by incandescent lamps, the effects of VF on lamps different from incandescent will be described analytically and experimentally; successively, a generalized lamp model proposed by the speakers will be described. Finally, a brief overview on the historical development of IEC flickermeter will be done explaining its implementation and its limitations in terms of assessment of LF for lamps different from incandescents concluding with the description of new proposals of flickermeters discussed in the scientific community.


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