长距离直流线路谐波阻抗计算方法与直流谐振特性研究  

Researches on Long-range DC Line Harmonic Impedance Calculating Methods and DC Resonance Characteristics

作　　者：刘心旸 马为民[2] 贾宏杰[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津市南开区300072 [2]国网北京经济技术研究院,北京市昌平区102209

出　　处：《中国电机工程学报》2017年第18期5313-5320,共8页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51277128);国家电网公司科技项目~~

摘　　要：对直流系统低次谐振特性的研究决定了特高压直流工程是否需要装设低频阻波、滤波设备。该文首先从直流线路"极–极"与"两极–地"两种回路结构及单位长度阻抗参数计算原理出发,对计及架空地线影响的双极线路等效参数进行详细推导分析;在此基础上,提出一种卡尔松积分项的优化拟合算法,并结合直流两种回路等效端口波阻抗的计算结论,求解得出直流线路在不同频率下的谐波阻抗;最后,依托灵州—绍兴?800k V特高压直流工程的线路阻抗试验测试数据,结合与原始卡尔松积分法的计算结果进行综合对比,进一步验证线路分布参数推导的正确性以及优化算法的计算精度。For UHVDC projects, it＇s determined by system harmonic characteristics whether low-frequency block-filters or DC-filters are needed to be installed or not. Firstly, based on two basic DC circuit ＂pole-pole＂/＂poles-earth＂ structures and calculation methods of line impedance per-unit, bipolar equivalent parameters considering overhead ground wires were obtained in detail; Then an optimal fitting method to approach original Carson integral results was proposed, with the equivalent wave impedance results of two DC circuit structures, the DC line harmonic impedance of different frequency was derived; Finally, depending on field-test DC line impedance results of the Lingzhou-Shaoxing ±800kV UHVDC project, as well as original Carson integral calculation results, the correctness of distribute parameters obtained and the accuracy of optimal fitting method were further demonstrated.

关 键 词：特高压直流 低次谐振 谐波阻抗 线路结构 优化拟合 卡尔松积分 

分 类 号：TM726[电气工程—电力系统及自动化]