Impact of LED Thermal Stability to Household Lighting Harmonic Load Current Modeling

Global warming and high fuel prices are pushing governments and people in the direction of energy-efficient appliances. Lighting ingests almost 20% of the total electricity consumption in the residential and commercial sector. Replacing the old technology lamps with the new energy efficient light emitting diode (LED) lamps can reduce power consumption substantially. However, these nonlinear LED lamps contain circuits that can disturb the power quality by injecting current harmonics. It may affect the distribution grid power quality due to the penetration of a large number of LED lamps. This paper presents the power quality measurement data of different LED lamps available in the Estonian market. A comparison of current harmonics of thermally stable and unstable lamps are presented. The combined effect on the power quality due to the high penetration of LED lamp in the residential buildings is also presented in the paper.