摘要
针对近几年现场运行暴露出来的变压器空投时50Hz谐波电流流经直流线路出现放大的问题,提出了一种通过直流线路参数来评估直流工程50Hz谐波放大的方法。首先,推导了长距离直流输电线路50Hz参数计算方法;其次,依托于某在运高压直流工程进行直流线路50 Hz参数计算,并以此深入研究了直流线路出现50Hz谐波放大的本质原因以及谐波放大的极值点,进而提出了用于评估直流谐波放大水平的指标;最后,通过EMTDC仿真平台验证了所提方法的正确性,并应用于实际工程进行谐波评估。结果表明:通过50Hz参数计算方法评估的直流谐波放大水平与实际工程一致,所提出的谐波放大极值点计算和放大评估方法不依赖于详细直流模型和EMTDC仿真。
In recent years,the enlargement phenomenon of 50 Hz harmonic current on DC line caused by energization of unloaded transformer is exposed on HVDC projects in field.To solve the problem above,a 50 Hz harmonic amplification evaluation method based on DC line parameters is proposed.Firstly,the calculation method of 50 Hz parameters for the long distance HVDC transmission line is derived.Secondly,50 Hz parameters of DC lines in a certain DC project are calculated.Then the essential reason and the extreme point of harmonic amplification are analyzed based on the results,furthermore,the index for evaluating DC harmonic amplification level is proposed.Finally,the correctness of the method proposed is verified by EMTDC simulation results,and the method is applied to the harmonic evaluation of an actual project.The results show that the evaluation results obtained by the proposed method are consistent with the practical project.Both the methods proposed to calculate harmonic amplification extreme points and evaluate DC harmonic level are independent with the detailed DC model and EMTDC simulation.
作者
李晓华
吴立珠
丁晓兵
张冬怡
吴嘉琪
蔡泽祥
LI Xiaohua1, WU Lizhu1 , DING Xiaobing2 , ZHANG Dongyi1 , WU Jiaqi1,3 , CAI Zexiang1(1. School of Electric Power, South China University of Technology, Guangzhou 510640, China; 2. Power Dispatching and Control Center of China Southern Power Grid, Guangzhou 510623, China 3. Maintenance Company o{ State Grid Hubei Electric Power Company, Wuhan 430050, Chin)
出处
《电力系统自动化》
EI
CSCD
北大核心
2018年第6期146-151,共6页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(51677073)~~
关键词
50Hz谐波
线路参数
放大极值点
直流谐波评估
50 Hz harmonic
line parameter
amplification extreme point
DC harmonic evaluation
