摘要
柔性直流输电技术是实现弱电网条件下大规模新能源送出的有效技术手段。对于以柔性直流输电系统作为唯一输电通道的大规模新能源集群,必须通过有功控制系统保障送端换流站运行在其可行PQ范围内。在分析其越限风险和控制需求的基础上,提出了激进型和保守型两种有功控制策略,并引入超短期预测作为分群指标以提高动态发电指标再分配的准确性。在此基础上提出了基于时序生产模拟的大规模新能源集群有功控制裕度确定方法,并以张北柔直电网及其汇集新能源为例进行了仿真分析。结果表明,激进型有功控制策略需要预留更大的控制裕度,但是对于发电空间的利用更加充分,新能源场站利用小时数更高。研究结果对于指导张北柔直电网送端新能源集群有功控制及安全裕度设置有参考意义。
The VSC-HVDC transmission technology is an effective method of realizing large-scale renewable energy transmission in weak power grids.For a large-scale renewable energy cluster with the VSC-HVDC transmission system as the only transmission path,an active power control system is essential for ensuring that the operating status of the sending terminal converter station is within its feasible PQ range.A radical active power control strategy and a conservative strategy are proposed based on the understanding of overload risk and control demand.Ultra short-term power prediction is introduced as a classification index to improve the dynamic redistribution accuracy of generation share.On this basis,a method of determining the active power control margin of a large-scale renewable energy cluster based on sequential production simulation is proposed.Simulation analysis is carried out considering the example of the Zhangbei VSC-HVDC power grid and its renewable energy collection.Results show that the radical active power control strategy must reserve larger control margin.However,the generation share is more fully utilized under this strategy,thereby significantly increasing the utilization hours of renewable energy stations.The results of this work may provide a reference for the active power control and safety margin setting of the Zhangbei VSC-HVDC power grid.
作者
吴林林
孙雅旻
刘海涛
徐曼
张隽
WU Linlin;SUN Yamin;LIU Haitao;XU Man;ZHANG Jun(State Grid Jibei Electric Power Co.,Ltd.Research Institute,Xicheng District,Beijing 100045,China;State Grid Jibei Electric Power Co.,Ltd.,Xicheng District,Beijing 100053,China)
出处
《全球能源互联网》
2020年第2期125-131,共7页
Journal of Global Energy Interconnection
基金
国家重点研发计划(2016YFB0900500).
关键词
柔性直流
大规模新能源
有功控制
机组分群
生产模拟
VSC-HVDC
large-scale renewable energy
active power control
generator classification
sequential production simulation
