摘要
针对风电通过柔直并网系统中电网电压跌落带来的功率盈余问题,提出了一种基于晶闸管的改进型直流耗能装置拓扑。首先在介绍其工作原理的基础上设计了投切控制策略,然后说明了其关键参数选取原则。通过在耗能装置中增设开通抑制电路,减小了其投入时对直流电压的冲击;利用晶闸管关断时电容的放电缓解了其退出时对直流电压的冲击。最后在PSCAD/EMTDC中对耗能装置的有效性进行了仿真验证,仿真结果表明该直流耗能装置在故障期间投入可以将直流电压稳定在安全值内。且该拓扑具有一定的经济优势。
Aiming at the problem of power surplus caused by grid voltage drop in the wind power via flexible DC grid-connected system,an improved DC energy dissipation device topology based on thyristor is proposed.Firstly,the switching control strategy is designed on the basis of introducing its working principle. Then the principle of selecting key parameters is explained. By adding a turn-on restraining circuit in the energy dissipation device,the impact on the DC voltage is reduced. And the impact on the DC voltage is alleviated by the discharge of the capacitor when the thyristor is turned off. Finally,the effectiveness of the energy dissipation device is simulated and verified in PSCAD/EMTDC. The simulative results show that the DC energy dissipation device can stabilize the DC voltage within the safe value during the fault. And the topology has certain economic advantages.
作者
赵东君
郭春义
刘博
江帆
李探
郑宽
ZHAO Dongjun;GUO Chunyi;LIU Bo;JIANG Fan;LI Tan;ZHENG Kuan(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2023年第1期100-106,共7页
Electric Power Automation Equipment
基金
国家电网有限公司总部科技项目(5200-202256077A-1-1-ZN)。
关键词
直流耗能
晶闸管
风电经柔直并网系统
直流过电压
DC energy dissipation
thyristor
wind power via flexible DC grid-connected system
DC overvoltage
