基于灰色关联法的直流接地极电场特性影响规律及参数灵敏性分析OA

As an important component of high-voltage direct current(HVDC)transmission system,the electric field distribution characteristics of DC grounding electrode have a significant impact on the safe and stable operation of the system as well as the surrounding environment.CDEGS software is used to establish simulation models of linear,star-shaped,single-ring,and double-ring DC grounding electrodes for electric field characteristics.Comparative analysis shows that the double-ring DC grounding electrode performs best in terms of electric field distribution characteristics and current dissipation performance.For the double-ring DC grounding electrode,the effects of soil resistivity,grounding electrode burial depth,and inner and outer ring radii on its electric field characteristics are thoroughly investigated.The grey relational analysis method is proposed to quantify the sensitivity of each parameter to the surface potential and step voltage.The results indicate that surface potential and step voltage are positively correlated with soil resistivity and negatively correlated with the grounding electrode burial depth and radius.Grey relational analysis shows that soil resistivity is the dominant factor affecting surface potential,with a correlation coefficient of 0.897 3.For step voltage,the influence of soil resistivity and electrode burial depth is comparable,with correlation coefficients of 0.800 5 and 0.794 7,respectively.Moreover,when the ratio of the inner to outer ring radius of the grounding electrode is 0.728,the uniformity of the electric field distribution is optimal.