“嵌入式”直流技术在省级输电网中的规划及应用  

Planning and application of embedded DC transmission technologyin the provincial transmission power grid

作　　者：王之伟 黄俊辉 程亮 胡伟 蔡晖 韩杏宁 WANG Zhiwei;HUANG Junhui;CHENG Liang;HU Wei;CAI Hui;HAN Xingning(State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210024,China;State Grid Jiangsu Electric Power Co.,Ltd.Economic Research Institute,Nanjing 210008,China)

机构地区：[1]国网江苏省电力有限公司,江苏南京210024 [2]国网江苏省电力有限公司经济技术研究院,江苏南京210008

出　　处：《电力工程技术》2022年第6期65-74,共10页Electric Power Engineering Technology

基　　金：国家重点研发计划资助项目(2021YFB2501600)。

摘　　要：江苏电网作为典型的省级输电网,面临着大规模新能源接入带来的能源转型压力和挑战,需要从“源网荷储”等方面进行转型升级。文中对负荷、电源、网架结构等江苏能源电力发展格局进行分析,总结了江苏电网面临的挑战,如重要输电断面输电能力不足等;结合新能源大规模发展及江苏输电网结构特点,重点分析了“十四五”及远景江苏输电网过江断面输电能力需求,提出了送、受两端均位于江苏交流电网内部且分布长江两侧的“嵌入式”直流技术。相较于传统互联方式建设的远距离、大容量直流输电技术,“嵌入式”直流输电技术通常利用现有架空输电线路、现有或预留交流电缆通道,构建交直流混联电网,在有限输电走廊空间内可大幅提高电网关键断面的输电能力,挖掘现有电网的供电潜力,满足电网发展的需求。As the typical provincial transmission power grid,Jiangsu power grid is faced with the pressures and challenges induced from system-integration of rapid developments of renewable energy during the energy transition period,which needs to be upgraded in"source-network-load-storage"and other aspects.Through the analysis of energy development from load,power supply,grid structure in Jiangsu,challenges faced by Jiangsu power grid such as insufficient transfer abilities of important transmission sections are put forward.Considering the large-scale integrated renewable energy and structure characteristics of Jiangsu transmission power grid,transmission-capacity demands of the Yangtze-river-crossing section during the"14th Five-Year Plan"and future are emphatically analyzed.Afterwards embedded DC transmission technology that both the transmission-and receiving-ends are located in Jiangsu AC network and distributed on both sides of the Yangtze River are proposed.Comparing with the traditional long-distance and high-capacity DC transmission technology constructed under the interconnection mode,the embedded DC transmission technology proposed in this paper usually uses the existing overhead transmission lines or existing/reserved AC cable channels to construct the AC-DC hybrid power grid in Jiangsu,greatly improving transmission capacities of important sections with limited transmission corridor spaces and power supply potential abilities of the existing power system to satisfy the development demands of Jiangsu power system.

关 键 词：能源转型 新能源接入 省级输电网 “嵌入式”直流输电技术 江苏电网 过江断面 

分 类 号：TM715[电气工程—电力系统及自动化]