直流输电系统中的一种新型滤波措施  

New Filtering Method for HVDC Systems

作　　者：李璨[1,2] 杭乃善[1,2] 张阁[1,2] 张海清[1,2] 

机构地区：[1]广西大学电气工程学院,南宁530004 [2]广西电力系统最优化与节能技术重点实验室,南宁530004

出　　处：《高压电器》2012年第6期12-17,共6页High Voltage Apparatus

基　　金：广西研究生教育创新计划资助项目(GXU11T32520)~~

摘　　要：针对直流输电系统对电网的谐波污染日益严重的问题,介绍了一种新型的滤波方法,该方法利用了直流输电系统中换流器的换相过程,通过串联电感来增大换相角从而改善换流器电网侧的电流波形,并串入电容器来补偿电感上的压降,这种方法使得直流输电系统的滤波器大大简化,利用较低的成本获得了较佳的滤波效果。以6脉动的整流器为例,说明了整流器的换相过程,分析了改变换相角大小的因素以及换相角对交流侧电流波形的影响,并通过6脉动的整流实验,验证了该方法在直流输电系统中应用的可行性。For the increasing harmonics pollution effect caused by HVDC transmission system on power grids, this paper introduces a new type of filtering method which makes use of the commutation course of the converters in HVDC transmission system, increases the angle of commutation by series inductance to improve current waveform at power grid side of the converters, and adds series capacitor to compensate the voltage drop on the inductance. The method simplifies the filter of HVDC transmission system, and gains better filtering performance with lower cost. Taking six-impulse rectifier for example, the commutation course of the rectifiers is described, the factors affecting the angle of commutation and the impact of the angle on current waveform at AC-side are analyzed. Experiment of the 6-impulse rectifier demonstrates the feasibility of the present method.

关 键 词：直流输电 谐波 换流器 换相角 

分 类 号：TM721.1[电气工程—电力系统及自动化]