多端柔性直流电网的中高频振荡特性分析  

An Analysis of Medium & High-Frequency Oscillation Characteristics in Multi-Terminal Flexible HVDC Networks

作　　者：雷傲宇 汪林光 梅勇[1] 周挺辉 蒋陈根 谢小荣[2] LEI Aoyu;WANG Linguang;MEI Yong;ZHOU Tinghui;JIANG Chengen;XIE Xiaorong(CSG Power Dispatching Control Center,Guangzhou 510663,Guangdong,China;State Key lab of Control and Simulation of Power Systems and Generation Equipment(Dept.of Electrical Engineering,Tsinghua University),Beijing 100084,China;Electric Power Research Institute,China Southern Power Grid,Guangzhou 510663,Guangdong,China;Chuxiong Power Supply Bureau,Yunnan Power Grid,Chuxiong 675000,Yunnan,China)

机构地区：[1]中国南方电网电力调度控制中心,广东广州510663 [2]电力系统及发电设备控制与仿真国家重点实验室(清华大学电机系),北京100084 [3]南方电网科学研究院有限责任公司,广东广州510663 [4]云南电网楚雄供电局,云南楚雄675000

出　　处：《电网与清洁能源》2023年第7期54-60,共7页Power System and Clean Energy

基　　金：中国南方电网有限责任公司科技项目(ZDKJXM20210063)。

摘　　要：大量研究和实发事件表明,柔性直流输电技术的应用会在系统中引入潜在的振荡风险。以往对于柔直振荡的研究往往集中于交流侧,而对于直流电网侧的振荡问题研究较少。该文针对柔直换流器与直流电网之间的振荡问题展开研究,首先通过电磁暂态仿真分析复现出柔直系统中高频振荡现象,其次建立系统直流阻抗网络模型,然后采用对数导数法定量分析系统振荡模式,最后分析了振荡的影响因素,总结了多端柔直电网中高频振荡特性。Extensive studies and practical events have shown that the application of flexible high voltage DC(HVDC)transmission gives rise to potential oscillation risks in the system.Previous studies of this issue mostly have focused on the AC side,while little research has been done on the DC grid side.In this paper,we investigate the oscillation problem among multiple converters and the DC transmissions.Firstly,the medium&high-frequency oscillation phenomenon is replicated in a multi-terminal flexible HVDC networks using electromagnetic transient simulations.Secondly,the DC impedance network model of the system is established.Thirdly,the logarithmic derivative method is used to quantify the system oscillation mode.Finally,the influence factors of oscillation are analyzed and the medium&high-frequency oscillation characteristics are summarized in the flexible HVDC transmission networks.

关 键 词：柔性直流 直流输电网络 中高频振荡 对数导数法 

分 类 号：TM712[电气工程—电力系统及自动化]