多回HVDC输电线路地面离子流场的计算

HVDC输电线路离子流场的计算对于输电线路的设计和电磁分析具有重要意义,为此,笔者在Deutsch假设的基础上对地面离子流场进行解析求解。根据输电线路电力线分布特点,建立了适用于多回输电线路的离子流场算法并探讨了输电线路极性排列方式对于离子流场的影响。该算法可考虑正、负极性导线的起晕差异,实例计算表明:该方法的计算结果与实测值有较高的吻合度,并对各种线路结构具有良好的适应性;双回线路极性排列方式对于合成电场最大值影响不大,而离子流密度则受到较大影响;在不考虑输电线其他结构参数的情况下,双回输电线路以--/++的极性排列方式最优;地线的存在对于双回线路地面离子流场并无明显影响。

Calculation of Ionic Flow Field for Multi-circuit HVDC Overhead Transmission Lines

The calculation of ionic flow field of HVDC transmission lines is significant to transmission lines design and electromagnetic analysis,therefore,an analytical method is proposed in the paper based on Deutsch's assumption. According to the characteristics of flux line distribution under HVDC transmission lines,the method is effective for multi-circuit lines with considering about the corona difference between positive and negative conductors.And the influence of pole arrangements is discussed.Compared with the experimental results,the results calculated by the method are match and indicated that the method has good adaptability under various lines configures.The pole arrangement of lines affects maximum total electric field at ground level hardly,but ionic current density has a great change.Without considering the other parameters of lines configure,--/++ is the best polar arrangement for doublecircuit transmission lines.And only a little effect of ground wire on ionic flow filed under multi-circuit lines.