柔性直流输电系统接入交流电网的高频谐振风险运行方式辨识  

Identification of high-frequency resonance risk operation mode for flexible DC transmission system connected to AC grid

作　　者：李清 孟潇潇 王强钢[3] 李章允 张连升 罗永捷 LI Qing;MENG Xiaoxiao;WANG Qianggang;LI Zhangyun;ZHANG Liansheng;LUO Yongjie(Maintenance&Test Center,EHV Power Transmission Company of China Southern Power Grid Co.,Ltd.,Guangzhou 510663,China;Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving,Hefei University of Technology,Hefei 230009,China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing 400044,China)

机构地区：[1]中国南方电网有限责任公司超高压输电公司检修试验中心,广东广州510663 [2]合肥工业大学新能源利用与节能安徽省重点实验室,安徽合肥230009 [3]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《电力自动化设备》2022年第8期206-214,共9页Electric Power Automation Equipment

基　　金：中国南方电网公司科技项目(CGYKJXM20180388)。

摘　　要：柔性直流输电系统接入交流电网后存在高频谐振的风险,研究表明交流电网运行方式变化与高频谐振的产生存在内在关联。针对交直流系统中的高频谐振问题,首先构建了柔性直流输电系统直流侧和交流侧计及串补站的等效阻抗模型,分析了柔性直流输电系统接入交流电网的高频谐振机理。对柔性直流输电系统交流侧运行方式变化(特别是线路发生N-1、N-2故障)下等效阻抗的变化规律进行了理论分析和总结。此外,提出了一种柔性直流输电系统接入交流电网的高频谐振风险运行方式辨识方法,并以某地区电网局部交直流系统实际数据为例进行仿真,验证了所提辨识方法的有效性。There is a high-frequency resonance risk after the flexible DC transmission system connected to the AC grid.Research shows that the change of AC grid operation mode is inherently related to the occurrence of high-frequency resonance.Aiming at the problem of high-frequency resonance in AC/DC system,the equivalent impedance model of the DC side and AC side with series compensation station in the flexible DC transmission system is constructed firstly.The high-frequency resonance mechanism of flexible DC transmission system connected to the AC grid is analyzed,and the variation law of equivalent impedance under the change of AC side operation mode of flexible DC transmission system(especially the lines happen N-1 and N-2 fault),is theoretically analyzed and summarized.In addition,an identification method of high-frequency resonance risk operation mode for flexible DC transmission system connected to AC grid is proposed,and the actual data of partial AC/DC system of in a certain power grid is taken as an example to simulation,which verifies the effectiveness of the proposed identification method.

关 键 词：柔性直流输电系统 谐波谐振 阻抗建模 风险辨识 

分 类 号：TM721.1[电气工程—电力系统及自动化]