Abstract
Nowadays increases the number of power electronic devices in distribution electrical networks rapidly. Modern generation and consumption units use high switching frequency power converters for the network connection and therefore cause the voltage and current distortion in the frequency range over 2 kHz (so-called “supraharmonics”) in addition to conventional harmonics. Supraharmonics cause additional power losses in electrical equipment. The goal of the offered paper is the estimation of power losses caused by supraharmonics. The method of the supraharmonic power losses estimation combining the analytic determination of AC cable resistances at the supraharmonic frequencies with the use of measurement results of supraharmonic currents in a real MV/LV cable network is considered in the paper. In the paper is shown that supraharmonic power losses in a MV cable under study can reach the values of several percent with respect to the power losses at the fundamental frequency and can exceed 10% regarding the power losses caused by conventional current harmonics.  
Highlights
The increase in the number of power electronic devices in electrical distribution networks has been a characteristic trend in the development of electric power supply for many years
The analysis shows that the supraharmonic power losses can exceed ten percent of power losses caused by conventional current harmonics in the MV cable under study
The paper has considered a method of estimating the supraharmonic power losses, which combines the analytic determination of AC cable resistances at the supraharmonic frequencies and the use of measurements of supraharmonic currents in a real MV/LV cable network
Summary
The increase in the number of power electronic devices in electrical distribution networks has been a characteristic trend in the development of electric power supply for many years. Modern generation and consumption units use high switching frequency power converters for the network connection, which leads to voltage and current distortion at frequencies higher than 2 kHz (so-called supraharmonics) in addition to conventional harmonics. The studies presented in [1,2,3] show that additional power losses in LV cables and HV transmission lines caused by conventional current harmonics can be up to thirty percent of power losses at the fundamental frequency. The estimation is based on the measurement results obtained in a real MV/LV network in Germany [6]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
