摘要
高压大容量DC/DC变换器是多电压等级直流互联的关键设备,能够实现电压变换和直流侧故障隔离等功能。使DC/DC变换器具备直流故障阻断能力,减少对直流断路器的依赖,能够在很大程度上降低建设成本。为此,提出一种基于半桥型模块化多电平换流器串联的DC/DC自耦变换器拓扑。在功率正送和功率反送两种工况下,分析DC/DC变换器两侧分别发生直流双极短路故障后的故障响应,并提出对应的故障隔离策略。针对不同工况下的双极短路故障,在PSCAD/EMTDC平台上进行仿真。仿真结果表明所提出变换器具备双向阻断直流故障的能力,与其他类型的DC/DC自耦变换器的对比分析结果验证了所提出变换器的经济性。
As crucial equipment for multi-voltage DC interconnection,high-capacity high-voltage DC/DC converters can be used for voltage conversion and DC fault isolation.The DC/DC autotransformer capable of blocking DC faults and reducing their reliance on DC circuit breakers can significantly reduce construction costs.To this end,a DC/DC autotransformer topology with half-bridge modular multilevel converters(HB-MMCs)connected in series is proposed.The fault response after a DC bipolar short-circuit fault on each side of the DC/DC autotransformer is analyzed under two operating conditions:forward power feeding and reverse power feeding.A corresponding fault isolation strategy is proposed.Simulations are performed on the PSCAD/EMTDC platform for the bipolar short-circuit faults under different operating conditions.The simulation results show that the proposed autotransformer can block DC faults in two directions.In contrast to other types of DC/DC autotransformers,the proposed autotransformer is economical.
作者
陆翌
王凤
邓伟成
陈骞
许建中
裘鹏
LU Yi;WANG Feng;DENG Weicheng;CHEN Qian;XU Jianzhong;QIU Peng(State Grid Zhejiang Electric Power Co.,Ltd.Research Institute,Hangzhou 310014,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China)
出处
《浙江电力》
2023年第1期1-12,共12页
Zhejiang Electric Power
基金
国家电网有限公司总部科技项目(5500-202119111A-0-0-00)。
