500 kV/±800 kV交直流同走廊运行时的电磁环境分析

Electromagnetic Environment Analysis of 500 kV/±800 kV AC/DC Power System Operating in the Same Corridor

为研究超、特高压交直流线路同走廊架设时所产生的电磁环境影响,建立500 kV/±800 kV交直流线路同走廊混合运行的仿真模型,利用CDEGS中的架空交流和直流传输线路设计模块计算不同天气、极导线高度和导线间距下的无线电干扰和可听噪声。计算结果表明:交流与直流线路单独运行时,其电场分布呈中心对称分布,而交直流混合电场分布无明显规律,适当地增大极导线高度可有效降低混合电场强度;混行线路产生的可听噪声值已超过规定的限值标准,而改变极导线间距,对混合线路产生的可听噪声和无线电干扰影响较小。所得结论可为交直流线路同走廊架设提供参考。

In order to study the electromagnetic environment impact of UHV and UHV AC/DC transmission lines in the same corridor,a simulation model of mixed operation of 500 kV/±800 kV AC/DC transmission lines in the corridor is established.The radio interference and audible noise under different weather,pole height and conductor spacing are calculated by using the overhead AC and DC transmission line design module in CDEGS.The calculation results show that:when AC and DC lines operate separately,the electric field distribution is centrosymmetric,while the distribution of AC and DC mixed electric fields has no obvious regularity.Properly increasing the height of pole wire can effectively reduce the intensity of mixed electric field,the audible noise produced by mixed line has exceeded the specified limit value standard,and the audible noise generated by changing the distance between poles and conductors will produce audible noise on hybrid lines and radio interference has little effect.The conclusion can provide reference for the erection of AC and DC lines in the same corridor.