架空线柔性直流电网构建方案Construction Scheme of Overhead Line Flexible HVDC Grid
孙栩;曹士冬;卜广全;王华伟;雷霄;卢斌先;
摘要(Abstract):
国家电网为配合绿色奥运的理念,计划在北京、河北建设柔性直流电网。从拓扑结构、关键设备、控制保护等方面对架空线柔性直流电网构建方案进行了研究。直流电网网架结构采用口字型结构,换流站采用对称单极结构;关于子模块拓扑的选择,存在半桥子模块结合高压大电流直流断路器以及故障自清除子模块结合快速机械直流开关2种方法。半桥子模块方案技术简单成熟,但是需要超快速保护装置,而且有可能存在直流断路器不能全面保护换流站的问题,需要配置大量的换流器限流电抗器与直流线路限流电抗器;故障自清除子模块方案不需要超快速保护装置,然而存在直流线路故障后所有站短暂闭锁的问题,但是不会造成整个电网的失稳。关键设备和控制保护目前来看不存在不可逾越的难题。
关键词(KeyWords): 架空线;柔性直流电网;构建方案
基金项目(Foundation):
作者(Author): 孙栩;曹士冬;卜广全;王华伟;雷霄;卢斌先;
Email:
DOI: 10.13335/j.1000-3673.pst.2016.03.003
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