采用区域分解法与高阶单元的交直流同塔线路混合电场计算

发布时间：2019-05-06 20:10

【摘要】：交直流线路同塔架设运行是解决电力输送时部分地区通道紧张问题的一种有效解决方案,电磁环境是其可行性分析中的一项重要问题。基于稳态求解方式,采用区域分解法对整个区域分块求解。在导线附近的区域利用2阶三角单元计算以提高电场求解的精度,在远离导线附近的广大区域则采用1阶单元,通过D-N交替法实现各子区域的耦合计算。此外,基于导线电晕的U-I特性曲线,提出一种新的导线表面离子密度更新策略,通过电压而非电场强度修正离子密度,导线表面电场强度直接服从Kaptzov假设。仿真结果与以往结果进行了对比,验证了算法的合理性和有效性。计算结果表明,采用基于区域分解的稳态求解方式可以用于快速预测交直流同塔线路的地面混合电场直流分量。
[Abstract]:The erection of AC / DC transmission line with tower is an effective solution to solve the problem of channel tension in some areas of power transmission. Electromagnetic environment is an important problem in the feasibility analysis of AC / DC lines. Based on the steady-state solution, the domain decomposition method is used to solve the whole region block. In order to improve the accuracy of electric field calculation, the second order triangular element is used in the area near the conductor, and the first order element is used in the vast area far away from the conductor. The coupling calculation of each sub-region is realized by the D ~ (N) alternating method. In addition, based on the U-I characteristic curve of the conductor corona, a new strategy for updating the ion density on the surface of the conductor is proposed, which modifies the ion density through the voltage rather than the electric field strength. The electric field intensity on the surface of the conductor obeys the Kaptzov hypothesis directly. The simulation results are compared with the previous results to verify the rationality and effectiveness of the algorithm. The results show that the steady-state solution based on domain decomposition can be used to rapidly predict the DC component of the ground hybrid electric field of AC-DC-tower line.
【作者单位】：电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系);国网北京经济技术研究院;
【基金】：国家电网公司科技项目(SGTJ0000KXJS1 400081)~~
【分类号】：TM75

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