Influence of EV location and penetration on harmonics in a three-phase low-voltage distribution network: a real-time data approach
摘要
The paper examines the impacts of incorporating electric vehicles (EV) to a three-phase low-voltage distribution system in power quality issues due to the nonlinear EV charging loads. A model of a network with 25 kVA, 415 V/415 V, 1:1 three-phase isolation transformer, a residential load, and a commercial load is developed in MATLAB/Simulink. The four most preferred electric two-wheeler models in Wardha city, Maharashtra State, India: Bajaj Chetak, OLA S1X, TVS iQube S, and Tunwal Lithino Li, were implemented by the use of the harmonic analysis controllable load modelling (HACLM) technique. A KRYKARD ALM31 power quality analyser (PQA) was used to measure the harmonic data in real time during charging. Analysis was performed in connection with the assessment of the greatest parameters that included voltage variation, distortion of current, and overall harmonic distortion (THD) at the point of common coupling (PCC). Two conditions are tested, including alternative positions of EV charging and alternative electric vehicle penetration level (EVPL) with balanced and unbalanced conditions. The results show that the harmonic distortion and phase imbalance of a three-phase distribution network is greatly influenced by the nature of EVs, the degree of EV penetration, and connection point. As a highly nonlinear two-wheeler EV was relocated between the near-end and the far-end PCC, current THD at PCC3 rose to over 63 per cent when compared to less than 1 per cent in normal EVs, and approximately 40 per cent THD was generated by the same vehicle at 12 per cent EV penetration. This paper has emphasized the significance of strategic planning in order to minimize the problem of power quality in low-voltage distribution networks, and thus, EVs are a reliable and sustainable transportation system.