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Performing power quality analysis of different LED lamps

Faruk Kürker


Lighting, which accounts for 20-30% of electricity use, is among the most important electricity consumption uses. Light Emitting Diode (LED) lamps are more durable, economical and environmentally friendly than incandescent, halogen and fluorescent lamps. One of the most important advantages of LEDs is their high efficiency. LEDs have become an important technology sector in lighting with their high efficiency and savings worldwide. When using LEDs, they need a driver circuit due to their operating characteristics, since it is necessary to limit the current flowing through them. Due to the power electronics elements contained in the driver circuits used in the LEDs, they draw harmonic current from the system. For this reason, it is very important to analyse and interpret the effects of LEDs on power quality. In this study, total harmonic distortion and power factor values, which are among the power quality problems caused by different power LEDs in the electrical network, were investigated. Measurement results were compared with IEC 61000-3-2 and IEEE 519-2014 harmonic standards. Compared with the standard, a passive harmonic filter is designed and added to the input of the LED lamp, since some harmonics exceed the maximum allowable harmonic limit. The designed passive low-pass filter is used to reduce the harmonics aroused from the driver of the LED lamp. The effect of the filter used in the system on harmonics was also investigated. As a result of the study, it has been seen that LEDs of different power values have significant effects on power quality.

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