A Simple Predictive Method of Critical Flicker Detection for Human Healthy Precaution

Abstract

Interharmonics and flickers have an interrelationship between each other. Based on International Electrotechnical Commission (IEC) flicker standard, the critical flicker frequency for a human eye is located at 8.8 Hz. Additionally, eye strains, headaches, and in the worst case seizures may happen due to the critical flicker. Therefore, this paper introduces a worthwhile research gap on the investigation of interrelationship between the amplitudes of the interharmonics and the critical flicker for 50 Hz power system. Consequently, the significant findings obtained in this paper are the amplitudes of two particular interharmonics are able to detect the critical flicker. In this paper, the aforementioned amplitudes are detected by adaptive linear neuron (ADALINE). After that, the critical flicker is detected by substituting the aforesaid amplitudes to the formulas that have been generated in this paper accordingly. Simulation and experimental works are conducted and the accuracy of the proposed algorithm which utilizes ADALINE is similar, as compared to typical Fluke power analyzer. In a nutshell, this simple predictive method for critical flicker detection has strong potential to be applied in any human crowded places (such as offices, shopping complexes, and stadiums) for human healthy precaution purpose due to its simplicity.

Investigation of severity of voltage flicker caused by second harmonic

“…Then, the maximum and minimum of the rms value are optimised by using minmax function in the MATLAB/Simulink. Subsequently, the relative fluctuation voltage (d v / v ) is calculated as below [29] At the same time, the rms value is also analysed by short‐time Fourier transform (STFT) [30] with sliding window of 2560 samples and sampling frequency of 12,800 Hz. STFT is utilised to identify the frequency component in of the rms value.…”

“…The first part is for analysing pure interrelationship between voltage flicker and harmonic. Next, voltage flicker analysis for critical voltage flicker waveform [29] is done in the second part. Finally, voltage flicker analysis for combination of critical voltage flicker and second harmonic are done in the third part.…”