并网逆变器稳定性分析中基于长度可伸缩的长传输电缆阻抗建模方法

Weihua Zhou, Yanbo Wang, Zhe Chen
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引用次数: 5

摘要

提出了一种基于阻抗的长度可伸缩长传输电缆(LTC)建模方法,该方法能够评估LTC对并网逆变器(GCI)稳定性的影响。首先从实测的终端短路导纳和开路导纳中提取电力电缆的单位长度电气参数。在此基础上,推导出不同长度电力电缆的终端导纳。最后,利用导出的终端导纳建立了LTC的解耦双端口电路模型。仿真结果验证了基于阻抗的LTC建模方法的有效性。提出的基于阻抗的建模方法可以避免重复的终端阻抗测量。此外,所提出的模型能够支持基于阻抗的具有长度可扩展LTC的GCI稳定性准则。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impedance-Based Modelling Method for Length-Scalable Long Transmission Cable for Stability Analysis of Grid-Connected Inverter
This paper presents an impedance-based modelling method for length-scalable long transmission cable (LTC), which is able to assess influence of LTC on stability of grid-connected inverter (GCI). Electrical parameters of power cable in per-unit-length (p.u.l.) are first extracted from the measured terminal short-circuited and open-circuited admittances. Then, the terminal admittance of power cable in different length can be derived on the basis of the obtained p.u.l. parameters. Finally, a decoupled two-port circuit model is established for the LTC using the derived terminal admittance. Simulation results are given to validate effectiveness of the proposed impedance-based modelling method for LTC. The proposed impedance-based modelling method is able to avoid repetitive terminal impedance measurement. Also, the proposed model is able to support impedance-based stability criterion for GCI with length-scalable LTC.
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