Statistical methods by determination of voltage harmonics in electric power net

the paper deals with the possibilities and differences in the use of statistical methods of mathematics for detecting the influence of a large number of semiconductor loads connected to the low voltage distribution system. Based on two weekly measurements in different housing estates, a harmonic stress analysis is performed. Gradually, the time sequences of the selected harmonic voltages and the frequency (statistics) of these voltages are presented. The cumulative frequency is finally shown. The example of the 15th harmonic voltage describes the properties of each statistical method. In conclusion, the comparison of the results for two housing estates is presented for this harmonic.