摘要
为解决目前大多数混合式直流断路器的成本高、故障电流抑制效果差等缺陷,提出了一种组合电容型混合高压直流断路器。该断路器主要采用预充电电容构成站端部分和线路部分,其中站端部分安装于直流电网的换流站直流出口侧,线路部分安装于每条直流出线上。通过两部分预充电电压给载流支路提供无弧分断条件,同时有效抑制故障电流。在详细描述了所提方案的拓扑结构、工作原理、控制策略以及与现有方案对比后,通过在PLECS中搭建三端环网模型对其进行了验证。结果表明：该方案可实现故障线路的可靠切除,同时预充电电容的存在避免了母线电压崩溃,保证非故障线路的正常运行。特别地,在未来日益复杂的多端直流电网中,站端部分的公用将大幅降低电网的断路器设备成本,具有较好的经济技术特性。
In order to solve problems such as high cost and poor current limiting effect in most conventional hybrid DC circuit breaker, we propose an assembly DC circuit breaker based on pre-charged capacitors which mainly contains a converter-part and a line-part, both of which consist of pre-charged capacitors. The converter-part is installed on the DC outlet side of converter station in DC grid, and the line-part is on each DC transmission line. This hybrid breaker provides an arc-less breaking condition to mechanical breaker branch through pre-charged voltage of capacitors and can suppress fault current effectively. The topology, working principle, control strategy, and comparison between the proposed and existing schemes are described in detail. Besides, the feasibility and effectiveness are validated by building a three-terminal DC model in PLECS. The results show that the proposed DC breaker can not only cut off the DC fault line, but also avoid collapse of bus voltage, ensuring the normal operation of non-faulty lines. Especially in future multi-terminal DC system, the shared converter-part will greatly save the equipment cost due to the common part at the converter site.
作者
叶晗
冒烨颖
陈武
薛晨炀
董阔军
李石
YE Han;MAO Yeying;CHEN Wu;XUE Chenyang;DONG Kuojun;LI Shi(Center for Advanced Power-conversion Technology and Equipment,Southeast University,Nanjing 210096,China;Suzhou Power Supply Company of State Grid Jiangsu Electric Power Co.,Ltd.,Suzhou 215000,China;Shandong ChenYu Electric Co.,Ltd.,Qingzhou 262515,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第7期2213-2221,共9页
High Voltage Engineering
基金
国家重点研发计划(2018YFB0904604)
国家电网公司重点示范工程项目(苏州工业园区智能电网应用示范区主动配电网综合示范工程)~~
关键词
直流断路器
组合电容型
预充电电容
母线电压
多端直流电网
设备成本
DC circuit breaker
combination capacitor
pre-charged capacitors
bus voltage
multi-terminal DC system
equipment cost
