中国电机工程学报2024，Vol.44Issue(19)：7593-7602,中插9,11.DOI:10.13334/j.0258-8013.pcsee.230601
表征柔性直流电网电压动态特性的降阶小扰动稳定模型
The Reduced-order Small-signal Model of VSC-DC Grid to Characterize the Dynamics of DC Voltage
摘要
Abstract
The voltage source converter(VSC)based DC technology is crucial for improving the rate of the penetration of renewable energy resources and achieving carbon peaking and carbon neutrality.Modeling with low order and moderate accuracy is of great significance for fast analysis of DC voltage dynamics and enhancement of system stability.Therefore,the reduced-order model of a VSC-DC grid is built to characterize the dynamics of DC voltage.First,the DC-side impedance of the VSC station is built in the form of second-order expression,which turns the droop-based outer control loop into a specified admittance with resistance-inductance characteristic.The VSC stations with different control are equivalent to a unified model of series-parallel impedance.Next,the reduced-order transfer function matrix of a VSC-DC system is formed based on the grid topology.The interactions of multi-VSC stations on DC voltage dynamics through DC grid coupling are investigated quantitatively by frequency response analysis,thereby guiding the parameters design of the droop gain and the outer control loop.Finally,the correctness and effectiveness of the proposed reduced-order model are validated by simulation.关键词
柔性直流电网/降阶模型/下垂控制/直流电压控制时间尺度/小扰动稳定Key words
VSC grid/reduced-order model/droop control/DC voltage control timescale/small-signal stability分类
信息技术与安全科学引用本文复制引用
王一振,邱逢良,雷鸣,王之谦,马世英..表征柔性直流电网电压动态特性的降阶小扰动稳定模型[J].中国电机工程学报,2024,44(19):7593-7602,中插9,11.基金项目
国家自然科学基金项目(52377119,U22B20109). Project Supported by National Natural Science Foundation of China(52377119,U22B20109). （52377119,U22B20109）
