Discrete Wavelet Transform for Estimation of Harmonic Pollution in Low-Voltage Grid Due to Electric Vehicle Charging

The advancement of power semiconductor switching devices has opened the road for the widespread usage of nonlinear power electronics loads in businesses and residences. Large converter-based devices, such as electric automobiles, have increased harmonic and supra-harmonic emissions in low-voltage networks, potentially damaging customer equipment and the grid. In the discipline of harmonic analysis, a precise assessment of harmonics is a must. The Discrete Wavelet Transform (DWT) is proposed in this study as an effective signal processing technique for estimating harmonics in the low voltage grid connected to EV charging stations. Simulated voltage and current signals from single and multiple EV chargers are used to test the suggested approach. The findings of this study will be vital in explaining how electric vehicles will affect the low-voltage grid.