On the behavior of LED lamps under non-sinusoidal voltage conditions

A Procedure for Mitigating the Light Flicker in Office LED Lighting Caused by Voltage Fluctuations

“…Initial phase angles of voltage and modulation signal ϕ n and ϕ m were set to zero. The modulated voltage signal (1) can be replaced by the Fourier series, as written in Equation (2), where the odd coefficients A n are calculated and the even coefficients are equal 0 [1,3].…”

“…Some of the proposed When comparing the harmonic components of modulated voltage and illuminance, the frequencies should not be compared directly, as the modulation of the emitted light is caused by the interharmonic components of the voltage. The harmonic component of illuminance at 12.5 Hz is caused by the harmonic component at the difference between the frequency of the harmonic of illuminance and the power frequency [1], f l = f n −f m = 50-37.5 Hz, where f n is the power frequency and f m the frequency of the corresponding modulation harmonic.…”

“…The appearance of light flicker with LED lighting was widely studied and analyzed in the past decade [1][2][3][4][5][6], but most of the studies were focused on the intrinsic flicker caused by LED drivers in normal operating conditions, and only a few of them were dealing with flicker induced by rapid voltage changes (RVC) [7][8][9][10]. The severity of voltage fluctuations of the supplied voltage in an electric distribution network has been examined thoroughly in the past decades, and the European countries limit it with the use of the electric power quality Standard EN 50160, which sets limits for short and long…”