Linearization modeling of transmission cable for analysis of PV grid tied inversion system

被引：0
|
作者：
Cui P. [1 ]
Sun X. [1 ]
Shen H. [1 ]
Ma Q. [1 ]
机构：
[1] Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei Province, Yanshan University, Qinhuangdao
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2021年 / 42卷 / 01期
关键词：
Distributed generation; Equivalent impedance model; Impedance interaction; Linearization; PV grid system; Transmission line theory;
D O I：
10.19912/j.0254-0096.tynxb.2018-0779
中图分类号：
学科分类号：
摘要：
In a distributed generation grid-connected system with long transmission lines, the transmission cable impedance model expression is a transcendental function. It is difficult to directly plot the transmission cable impedance curve when analyzing such systems, and the transduction term introduced by the transmission cable makes it difficult for the system to multi-resonance and stability analysis. To simplify the analysis of such problems, based on the transmission cable model, a Padé linearization fitting method is presented after analyzing of the characteristics of the actual impedance model of the transmission cable. The conclusion is drawn that the long transmission cable uses the high-order fitting model and the short transmission cable uses the low-order fitting model through the analysis of the fitting order of the transmission cables of different lengths. In addition, in order to bring the fitting model closer to the actual situation, the skin effect of the long transmission cable is considered. The introduction of the peak factor eliminates the inaccurate resonance peaks of the high frequency band of the Padé fitting model, which makes the fitting model more reliable. Finally, the cable model obtained by fitting is verified, and the stability of photovoltaic grid connected system is analyzed by using the fitted transmission cable model. Simulation and experiment verify the accuracy of the fitting model in the analysis of photovoltaic grid connected system. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.
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页码：21 / 29
页数：8
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