一种含限流限压功能的混合式直流断路器方案

发布时间：2018-05-20 19:08

本文选题：混合式直流断路器 + 模块化多电平换流器　；参考：《中国电机工程学报》2017年04期

【摘要】：基于模块化多电平换流器(modular multilevel converter,MMC)的多端柔性直流输电(multi-terminal DC,MTDC)是新能源并网和消纳的重要手段,而高压直流断路器是构建MMC-MTDC的核心设备之一。在现有混合式直流断路器(hybrid DC circuit breaker,HDCCB)的基础上,提出一种改进的具备限流限压功能的HDCCB技术方案。改进HDCCB的主断路器支路由包含电力电子断流单元、RC缓冲单元和避雷器单元的子模块组成。每个子模块具备独立的电流切除、电压建立和能量吸收能力,可以在分断过程中充分利用快速隔离开关的绝缘能力,有效抑制MMC-MTDC直流短路故障电流的上升率,减小HDCCB在切除故障电流时的过电压应力,降低耗能组件的能量吸收。理论分析和PSCAD/EMTDC仿真结果验证了所提出的改进HDCCB技术方案的可行性和有效性。
[Abstract]:Multi-terminal multi-terminal DC MTDC based on modularized multilevel converter (Modular multilevel converters) is an important means of new energy grid connection and absorption. High voltage DC circuit breaker is one of the core equipment to construct MMC-MTDC. Based on the existing hybrid DC circuit breaker (HDCCB), an improved HDCCB with current limiting function is proposed. The main circuit breaker branch routing of improved HDCCB consists of sub-modules of power electronic cutoff unit RC buffer unit and arrester unit. Each sub-module has independent current removal, voltage establishment and energy absorption, which can make full use of the insulation ability of the fast isolating switch during the breaking process, and effectively suppress the rising rate of the DC short-circuit fault current in MMC-MTDC. The overvoltage stress of HDCCB is reduced when the fault current is removed, and the energy absorption of the energy dissipation module is reduced. Theoretical analysis and PSCAD/EMTDC simulation results verify the feasibility and effectiveness of the proposed improved HDCCB technology.
【作者单位】：北京平高清大科技发展有限公司;平高集团有限公司;
【基金】：国家电网公司科技项目(PGKJ[2015]068)~~
【分类号】：TM721.1;TM561

【参考文献】