高电缆化率对直流受端输电网谐波传递特性的影响  

Impact of High Cable Rate on Harmonic Transfer Characteristics of Transmission Power Grid at HVDC Receiving-End

作　　者：耿晓红 文俊[1] 谈萌 贺冬珊 王思超 韩民晓[1] GENG Xiaohong;WEN Jun;TAN Meng;HE Dongshan;WANG Sichao;HAN Minxiao(School of Electrical&Electronic Engineering,North China Electric Power University,Beijing 102206,China;State Key Laboratory of Advanced Power Transmission Technology(Global Energy Internet Research Institute Co.,Ltd.),Beijing 102209,China)

机构地区：[1]华北电力大学电气与电子工程学院,北京市102206 [2]先进输电技术国家重点实验室(全球能源互联网研究院有限公司),北京市102209

出　　处：《电力建设》2020年第1期106-113,共8页Electric Power Construction

基　　金：国家重点研发计划项目(2016YFB0900600)~~

摘　　要：电缆线路占比增加将使直流受端输电网谐波传递特性发生改变。首先提出了电缆化率的概念,并推导出准确计及电缆化率的输电线路谐波模型,继而建立了计及电缆化率的交直流谐波经直流逆变站出线传递的谐波电压传递系数模型。最后,以上海宜华直流输电工程为例详细分析了在不同直流逆变站出线方式下电缆化率对直流受端输电网谐波相互传递特性的影响。研究结果表明:直流系统与受端输电网谐波相互传递特性受直流逆变站出线方式、线路参数、电缆化率及谐波频次制约;电缆化率增加会引起谐振频率左移,高频段谐波偏移程度更显著;所推导模型可根据线路实际参数、电缆化率定量分析谐波放大程度,作为未来受端输电网电缆线路规划及建设的重要依据。Increasing the proportion of cable lines will change the harmonic transfer characteristics of the transmission power grid at HVDC receiving-end. In this paper,the concept of cable rate is proposed firstly,and the harmonic model of distribution parameters of transmission line that accurately considers the cable rate is derived. Then,the model of harmonic voltage transfer coefficient for AC and DC system harmonics transmitted through the outgoing line of HVDC inverter station is established,which considers the cable rate. Finally,taking Yihua HVDC project in Shanghai as an example,the influence of cable rate on harmonic interactive transfer characteristics of transmission power grid at HVDC receiving-end under different modes of outgoing line is analyzed in detail. The results show that the harmonic transfer characteristics between HVDC system and AC transmission power grid at receiving-end are constrained by modes of outgoing line at HVDC inverter station,parameters of outgoing line,cable rate and harmonic frequency;the increase of cable rate will cause the resonance frequency to shift to the left,and the offset in the high frequency is more serious. The derived model can quantitatively analyze the degree of harmonic amplification according to actual line parameters and cable rate,which is a significant basis for cable line planning and construction of receiving-end transmission grid in the future.

关 键 词：受端输电网 电缆线路 高压直流输电 电缆化率 输电线路谐波模型 谐波电压传递系数 

分 类 号：TM751[电气工程—电力系统及自动化]