摘要
高压直流输电线路发生电晕放电时,周围空间会充满带电离子,从而使空间电场显著增强。为了准确计算地面离子流场,文中采用该有限元—积分法对双极离子流场的控制方程进行求解。文中在计算合成电场时采用了有限元外推法,同时还对空间电荷密度初值进行了改进。通过利用该方法对同轴圆柱模型和±400 kV的直流线路进行的比对计算,验证了该算法的有效性。同时,在实际的±500 kV直流线路上,把该算法的计算结果与已有算法的计算结果进行了对比。实际线路验证和算法间对比均表明,该方法具有较好的精度。最后,采用所提出的方法对±800 kV直流输电线路的地面合成电场和离子流密度进行了预测。
The ions generated by corona discharge of high voltage direct current（HVDC） transmission lines can strengthen the electric field intensity in the space around the lines. In order to accurately calculate the ion flow field, the finite element-integral method is applied to solve the control equations of bipolar ionized field. The finite element extrapolation is employed in the calculation of the resultant electric field, and the initial value of space charge density is improved. Application of the proposed method to calculations of the coaxial cylindrical model and the ±400 kV DC transmission lines verifies its effectiveness. Moreover, an actual ±500 kV DC transmission lines is calculated with this method, and the result is compared with those from the existing algorithms, as a result, higher accuracy of the proposed method is observed. In addition, the proposed method is adopted to predict the resultant electric field intensity and ion current density at the ground level under ±800 kV DC transmission lines.
出处
《高压电器》
CAS
CSCD
北大核心
2013年第8期1-7,共7页
High Voltage Apparatus
基金
国家自然科学基金项目(50907075)
重庆大学输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512708303)~~
关键词
有限元-积分法
高压直流线路
合成电场
离子流密度
finite element-integral method
HVDC transmission lines
resultant electric field
ion current density
