The Reduced-order Small-signal Model of VSC-DC Grid to Characterize the Dynamics of DC Voltage

被引：0
|
作者：
Wang, Yizhen [1 ]
Qiu, Fengliang [2 ]
Lei, Ming [1 ]
Wang, Zhiqian [1 ]
Ma, Shiying [3 ]
机构：
[1] Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Nankai Distirct, Tianjin,300072, China
[2] State Grid Hunan Electric Power Company Limited Research Institute, Hunan Province, Changsha,410000, China
[3] China Electric Power Research Institute, Haidian District, Beijing,100192, China
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2024年 / 44卷 / 19期
基金：
中国国家自然科学基金;
关键词：
Electric power transmission networks - Transfer matrix method;
D O I：
10.13334/j.0258-8013.pcsee.230601
中图分类号：
学科分类号：
摘要：
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. ©2024 Chin.Soc.for Elec.Eng.
引用
收藏
页码：7593 / 7602
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