±800kV特高压直流线路采用不均匀分裂降低电晕损耗

±800 kV UHVDC Transmission Line Using Asymmetric Division to Reduce Corona Loss

为了提高特高压直流输电线路的输送容量、优化线路周围的电磁环境、压缩输电线路走廊宽度,一般采用分裂导线。笔者考虑分裂导线表面电场分布不均的条件下,采用模拟电荷法较准确计算特高压直流分裂传输线的电晕损耗,地面合成电场和离子流密度。定量地分析不同子导线电晕损耗的差异,提出一种不均匀分裂结构线路。算例分析对比表明,采用不均匀分裂结构线路,地面合成电场和离子流密度略有增加,但其总的电晕损耗有较明显的下降,在不增加线路建设成本的情况下能产生很大的经济效益。

Bundle conductors are widely used in the high vohage direct current（HVDC）power transmission in order to possess a higher line capacity, to optimize the electromagnetic environment, and to narrow down the width of transmission line corridor. In this paper, under the condition of considering the bundle conductor surface electric field distribution, the charge simulation method is used to calculate the UHV DC bundle transmission line corona loss, total ground electric field strength and ion current density. Quantitative analysis of different sub conductor corona loss difference is made and a kind of asymmetric division structure line is suggested. The example analysis shows that, by using asymmetric division structure line, total ground electric field strength and ion current density increased slightly, but its total corona loss has decreased significantly. It can produce great economic benefits without increasing the lines construction cost.