新能源经柔性直流孤岛送出系统小信号同步稳定机理OA北大核心CSTPCD
Small Signal Synchronous Stability Mechanism of Renewable Energy Transmission System Through VSC-HVDC Working as Island Mode
为满足绿色低碳发展的需要,我国正大力推进大规模新能源基地的开发,大规模新能源经柔性直流孤岛送出系统受到越来越多的关注.该系统中新能源设备通常采用常见的跟网型控制,为支撑系统稳定运行,柔性直流设备需采用构网型控制.然而目前对于这样一个高比例甚至100%电力电子系统的同步稳定机理尚不完善.针对锁相环和虚拟同步环在系统同步过程中的作用,建立了跟网型新能源和构网型柔性直流设备的同步模型.然后分析了系统小信号稳定性,推导出系统保证稳定的运行区域,分别针对新能源和柔性直流设备提出了存在失稳风险的运行状态.最后在PSCAD仿真中验证所提结论.
Due to the demand of green and low-carbon development,China is vigorously promoting the construction of large-scale renewable energy bases.Renewable energy transmission system through voltage source converter-voltage direct current(VSC-HVDC)working as island mode is receiving more and more attention.For the system,renewable energy devices usually adopt grid-following control,and the VSC-HVDC adopts grid-forming control.However,the synchronous stability mechanism for such a high-proportion or even 100%power electronic system is still unclear.Focusing on the role of phase-locked loops and virtual synchronous generator loops in the synchronization,a synchronization model for grid-following and grid-forming devices is established.Then,the small signal stability of the system is analyzed,and the operating area that ensures stable operation is derived.The operating states with instability risks are respectively proposed both for renewable energy and VSC-HVDC devices.Finally,the conclusions are veri-fied in PSCAD simulation.
吴应双;杨子千;刘明顺;张野;王寅;唐王倩云
贵州电网有限责任公司,贵阳 550002南方电网科学研究院,广州 510663
动力与电气工程
新能源发电柔性直流输电跟网型控制构网型控制小信号同步稳定分析
renewable energy generationVSC-HVDC transmissiongrid-following controlgrid-forming controlsmall-signal synchronous stability analysis
《南方电网技术》 2024 (007)
3-10,26 / 9
国家自然科学基金青年科学基金资助项目(52207110);中国南方电网有限责任公司科技项目(GZKJXM20222215).Supported by the National Natural Science Foundation Youth Science Foundation Project of China(52207110);the Science and Technology Project of China Southern Power Grid Co.,Ltd.(GZKJXM20222215).
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