多端混合直流系统的转换开关配置计算分析  

Calculation Analysis of DC Transfer Switch Configuration for Multi-Terminal Hybrid HVDC System

作　　者：郭龙 许树楷 侯婷 李凌飞 徐迪臻 卢毓欣 张祖安 GUO Long;XU Shukai;HOU Ting;LI Lingfei;XU Dizhen;LU Yuxin;ZHANG Zu’an(State Key Laboratory of HVDC Transmission Technology,Electric Power Research Institute,CSG,Guangzhou 510663,China)

机构地区：[1]直流输电技术国家重点实验室(南方电网科学研究院),广州510663

出　　处：《南方电网技术》2018年第11期59-65,共7页Southern Power System Technology

摘　　要：结合特高压多端混合直流输电系统"多端"和"混合"的特点,对直流转换开关的配置和工程计算进行了分析。针对因"多端"特点带来的复杂分流关系问题,采用随机数原理与仿真建模结合的方式,提出了大地回线转换开关和金属回线转换开关转换电流计算的新方法,避免了复杂的数学计算,所得近似转换电流最大值能够应用于工程转换开关震荡回路和避雷器参数配置;针对"混合"特点,提出在柔性直流站可考虑不安装中性母线开关,其原保护范围可由柔直换流器直接闭锁和中性母线差动保护进一步扩大来代替的建议,并通过仿真建模进行了验证。The configuration and engineering calculation of DC transfer switch are analyzed by considering the characteristics of ‘multi-terminal’ and ‘hybrid’ of multi-terminal UHVDC system.Aiming at the problem of complex distributional relationship caused by “multi-terminal” characteristics,a new transfer current calculation method of metallic return transfer breaker(MRTB)and earth return transfer breaker(ERTB),which avoids complex mathematical calculations by combining the random number theory and simulation modeling,is mentioned.The obtained approximate conversion current maximum value can be applied to the configuration of engineering switch oscillating circuit and arrester parameters.Aiming at the "hybrid" characteristics,neutral bus switch(NBS)is not suggested installing into the MMC converter station,its original protection function can be replaced by blocking MMC converter or expanding the protection scope of neutral bus differential protection.The conclusion is verified through simulation models.

关 键 词：特高压多端混合直流 直流转换开关 近似转换电流最大值 

分 类 号：TM721.1[电气工程—电力系统及自动化]