作　　者： ; ; ; ; ;

机构地区： 中国南方电网有限责任公司

出　　处： 《南方电网技术》 2020年第3期42-48,共7页

摘　　要： 广东电网负荷密度不断攀升,电网结构日益复杂,短路电流超标,交直流交互影响,大面积停电风险等问题威胁系统安全稳定运行,珠三角核心区潮流阻塞问题限制了电力互剂和事故支援能力的发挥,内外双环网结构难以适应发展需求。基于粤港澳大湾区及广东社会经济、能源资源发展特征,分析了广东输电网络发展的主要目标,以此为基础,考虑实际运行标准和工程建设条件等因素,形成了规划方案定量化比较标准和指标;在南方电网既定的西电东送输电和主网架发展技术路线的基础上,深入研究广东电网目标网架规划方案,重点对采用柔性直流直接异步互联、基于500 kV湾区外环的柔性直流异步互联和特高压交流湾区外环3个方案进行了技术经济指标比较。基于500 kV湾区外环方案可适应大湾区和广东的发展需求、有效应对短路电流超标等问题且可行性较高、经济代价合理,推荐其作为广东电网目标网架构网方案。 The load density of the Guangdong power grid keeps rising,and the structure of the power grid is becoming more and more complex.The original double-loop network structure can no longer meet the development needs,which increases the risk of large-scale power outages.Meanwhile,the AC-DC interaction problems are prominent,the short-circuit current is becoming difficult to control,and the power flow congestion problem of the Pearl River Delta region is outstanding which further limits the ability of accident support of power gird.Based on Guangdong-Hong Kong-Macao Greater Bay Area,Guangdong's socioeconomic development and resource endowment,the key development target of the Guangdong transmission grid is analyzed.Meanwhile,considering the requirements of steady operation of the power grid and engineering construction conditions in practice,quantitative index and criteria for comparison are formed.Based on the technical route of the West-East electricity transmission projects as well as the developed scheme of the main grid of China Southern Power Grid,this paper contrasts different technical routes that include flexible DC back-to-back asynchronous grid interconnection,constructing a 500 kV outer ring of the Guangdong-Hong Kong-Macao Greater Bay Area based on flexible DC back-to-back grid interconnection,and constructing a 1000 kV Ultra-high voltage AC outer ring of the Guangdong-Hong Kong-Macao Greater Bay Area.The technical route of constructing a new 500 kV outer ring of the Guangdong-Hong Kong-Macao Greater Bay Area based on flexible DC back-to-back grid interconnection is recommended as the target network planning scheme of the Guangdong Power Grid because it could meet the Guangdong development needs and control the short-circuit current with good economic efficiency and construction feasibility.

关 键 词： 目标网架 东西分区 湾区外环 柔性直流 特高压交流

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