单交多直混联网架运行特性分析与构建方法  

Operation Characteristics Analysis and Construction Principles of Single-AC Multiple-DC Transmission Sections

作　　者：黄莹[1] 王国腾 蔡晖 晏铭新 徐政[1] 韩杏宁 HUANG Ying;WANG Guoteng;CAI Hui;YAN Mingxin;XU Zheng;HAN Xingning(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;Economic Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210008,China)

机构地区：[1]浙江大学电气工程学院,杭州310027 [2]国网江苏省电力有限公司经济技术研究院,南京210008

出　　处：《高电压技术》2025年第4期1645-1653,共9页High Voltage Engineering

基　　金：国家电网有限公司科技项目(5100-202418018A-1-1-ZN)。

摘　　要：我国负荷中心地区电网交流线路密集,存在潮流控制困难、短路电流超标等问题,交流电网的规模效应趋于饱和,亟需发展交直流混联新形态电网结构。为提高交直流混联电力系统的可控性、安全性和稳定性,首先分析了3种典型交直流输电方式的技术特点,包括全直流异步互联方式、全交流同步互联方式和常规交直流混联方式;然后,针对单交多直混联这一特殊网架结构,从潮流控制能力、N-1过载、短路电流、频率稳定性、电压稳定性、同步稳定性等方面分析该网架的运行特性,并给出单交多直混联网架的构建方法;最后,在一个单交多直典型算例中开展仿真分析,结果表明单交多直混联网架可以兼顾交直流电力系统可控性、安全性和稳定性需求,是一种极具应用前景的网架结构。In regions with high electricity demands,the AC power grid is densely populated,leading to difficulties in controlling power flow and issues with excessive short-circuit currents.The scale effect of AC power grids trends to saturation,necessitating the development of new hybrid AC/DC grid structures.To improve the controllability,safety,and stability of AC/DC hybrid power systems,three typical AC/DC transmission methods are first analyzed in terms of their technical characteristics:full DC asynchronous interconnection,full AC synchronous interconnection,and conventional AC/DC hybrid interconnection.Next,in accordance with the unique transmission configuration of single-AC multiple-DC transmission sections,the operational characteristics of this configuration are analyzed in terms of its ability to control power flow,N−1 overload,short-circuit currents,frequency stability,voltage stability and synchronous stability.Principles for constructing the single-AC multiple-DC transmission section are also provided.Finally,case studies are conducted in a modified IEEE 11-bus system.The results demonstrate that the single-AC multiple-DC transmission configuration can simultaneously compromise the controllability,safety,and stability requirements of hybrid AC/DC power systems,making it a highly promising grid structure with practical applications.

关 键 词：单交多直 交直流混联 网架结构 运行特性 构建原则 

分 类 号：TM721.1[电气工程—电力系统及自动化]