LED street lighting: A power quality comparison among street light technologies

摘要

High-pressure sodium lamps are currently the main lamps used in public lighting.However, the possibility of using high-power light emitting diode (LEDs) for streetlighting is growing continuously due to their greater energy efficiency, robustness,long life and light control. The aim of this paper is to study the power qualityof high-power lighting networks based on LED and high-pressure sodium lamps.Both electromagnetic and dimmable electronic ballasts, which can dim the lampoutput smoothly and uniformly, have been used connected to high-pressuresodium lamps. High-pressure sodium lamps connected to electronic equipmenthave been tested with different arc power levels using dimming on a 230V powersupply. The study presented in this paper is completely based on measurements,including harmonic currents in the frequency range up to 150 kHz for all thetechnologies. The main results show a broadband spectrum in LED lamps whichconfirms other research in Fuorescent lamps powered by high-frequency ballasts.Results also indicate a decrease in the harmonic value with increasing harmonicorder, and a decrease in the harmonic value at half load (60%) compared with fullload (100%). Although total harmonic distortion of the current is lower with highpressuresodium lamps connected to electronic rather than electromagneticballasts, LED lamps achieved the lowest total harmonic distortion of current