The chapter deals with the characterization of time varying harmonic currents from large penetration electronic equipment. The time-varying characterization of single-phase NL appliances of large penetration into end-use such as desktop PC, printer, photocopier and cell phone battery charger has been presented first. The time-varying behavior of harmonics has been investigated through the use of specific measurement equipment allowing continuous harmonic monitoring. Pdf’s and distribution functions have been calculated for the large amount of data made available from the monitoring activity. Then, an experimental procedure has been presented which helps predict the mutual influence between several single-phase electronic equipment and the LV distribution network. Two parametrical models can be identified from monitoring results. The models are expressed via some curves that have been defined: 1) attenuation curves; 2) impact curves. The attenuation curves allow to parametrically estimate the effects of cancellation phenomena on net harmonic currents. The impact curves allow to parametrically predict the NL load influence on voltage harmonic distortion at PCC.
Time-varying harmonic currents from large penetration electronic equipment
PRUDENZI, ALBERTO
2009-01-01
Abstract
The chapter deals with the characterization of time varying harmonic currents from large penetration electronic equipment. The time-varying characterization of single-phase NL appliances of large penetration into end-use such as desktop PC, printer, photocopier and cell phone battery charger has been presented first. The time-varying behavior of harmonics has been investigated through the use of specific measurement equipment allowing continuous harmonic monitoring. Pdf’s and distribution functions have been calculated for the large amount of data made available from the monitoring activity. Then, an experimental procedure has been presented which helps predict the mutual influence between several single-phase electronic equipment and the LV distribution network. Two parametrical models can be identified from monitoring results. The models are expressed via some curves that have been defined: 1) attenuation curves; 2) impact curves. The attenuation curves allow to parametrically estimate the effects of cancellation phenomena on net harmonic currents. The impact curves allow to parametrically predict the NL load influence on voltage harmonic distortion at PCC.Pubblicazioni consigliate
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