±500 kV同塔双回直流输电线路极导线布置方案研究

Study on Polar Conductor Arrangement Scheme for ±500 kV Double Circuit HVDC Transmission Lines on Same Tower

在不同极导线布置方案下同塔双回线路的电磁环境和两回线路间的相互影响存在差异,因此有必要对±500 k V同塔双回直流输电线路极导线布置方案进行对比分析,为同塔双回直流输电线路的设计提供参考。以葛南—荆沪直流线路同塔部分为例,将单回直流输电线路的电磁环境计算方法拓展到双回线路中,计算该直流线路同塔部分的导线、地线表面最大电场强度、无线电干扰值、可听噪声和电晕损失,并在PSCAD/EMTDC中搭建模型进行了仿真分析。根据电磁环境计算结果和仿真数据,综合各方面指标确定了葛南—荆沪直流线路同塔部分的最优极导线布置方案。

The electromagnetic environment of double circuit transmission lines on same tower and the mutual influence between double circuit transmission lines are different under different arrangements of polar conductors so that it is necessary to compare and analyzes polar conductor arrangement schemes of ± 500 kV double circuit HVDC transmission line on same tower which provides reference to the design of double circuit HVDC transmission line on same tower. Part of Genan-Jinghu HVDC transmission lines on same tower is taken as an example, and the electromagnetic environment calculation method of single HVDC transmission line is expanded to double circuit transmission lines to calculate the conductors, the maximum surface electric field strength of ground wire, the radio interference value, the audible noise and the corona loss of the HVDC transmission lines. The model is built in PSCAD/EMTDC and is simulated and analyzed. According to the electromagnetic environment calculation results and simulation data, the optimal polar conductor arrangement scheme of the part of transmission lines on same tower in Genan-Jinghu HVDC are determined by comprehensive consideration of indexes from all aspects.