直流输电线路电晕损失数值计算方法  

Numerical Calculation of the Corona Loss of the HVDC Transmission Lines

作　　者：尹晗[1] 张波[1] 李敏 刘磊 何金良[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084 [2]南方电网科学研究院,广州510620

出　　处：《高电压技术》2013年第6期1331-1336,共6页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2011CB209401)~~

摘　　要：高压直流输电线路电晕损失的计算由于线路周围空间电荷的存在而较为复杂。在直流输电线路设计中,只能依赖各种经验公式对线路电晕损失进行估计,方法的普适性较差。为此,以直流输电线路离子流场数值计算为基础,分析了采用Shockley-Ramo法则、沿导线闭合曲线积分以及沿计算边界积分等3种方式计算导线电晕电流的合理性。结果显示,从计算结果与测量结果的一致性看,Shockley-Ramo法和沿导线闭合曲线积分法与沿计算边界积分法相比均较好,但考虑Shockley-Ramo法则利用所有的空间电荷来计算电晕电流,而沿导线闭合曲线积分方法仅利用导线附近的电荷,因此Shockley-Ramo法则具有更好的通用性。该方法能够快速、稳定、准确地计算高压直流输电线路的电晕损失,为直流输电线路设计提供参考。Due to the influence of space charges around conductors, it is very complicated to calculate the corona loss of high-voltage direct-current （HVDC} transmission lines. Thus, in engineering designs, various empirical formulas are adopted to estimate the corona loss, which lacks universality. Therefore, on the basis of a numerical analysis of the ion flow field around HVDC transmission lines, we analyzed the rationality of three methods for calculating corona current, i.e. the Shockley-Ramo method, integration around conductor, and integration around calculation boundary. The analysis shows that, when the Shockley-Ramo method and integration around conductor method are adopted, the calculation results are close to the measurement results. However, the Shockley-Ramo method uses all the space charges to calculate corona current, while the integration around conductor only uses the charges around conductor. In numerical calculations, the Shockley-Ramo method has better universality, and can calculate the corona loss of the HVDC transmission lines fast, stably, and accurately, providing reference for engineering designs.

关 键 词：高压直流输电线路 电晕放电 空间电荷 迎风差分法 电晕损失 Shockley-Ramo法则 

分 类 号：TM751[电气工程—电力系统及自动化]