Resonance Risk in Infirm-interconnected Grid Considering Photovoltaic Devices

Yufei Teng, Xing Zhang, Chengwei Fan, Xujiang Chen, Ran Zhang
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引用次数: 1

Abstract

Due to the long transmission line and low level of load, the resonance is of severity in the infirm-interconnected grid with power electronic components. This paper uses modal analysis method to analyze the resonance risk of infirm-interconnected grid considering photovoltaic power generation devices (PV). Firstly, the harmonic model of PV, as well as the transmission line, transformer, is established. Meanwhile, in order to reduce the complexity of eigenvalue computation, the harmonic modal impedance of main grid is transformed to that of PCC node connecting the infirm interconnected grid by Gauss elimination. Then a practical infirm interconnected grid in western China is used as the case study and modal analysis is utilized to study the resonance risk. The result indicates that the L-C-L filter of PV would be the main factors affecting the resonance point.
考虑光伏设备的弱互联电网共振风险
由于输电线路较长、负荷水平较低,弱互联电网中电力电子元件的谐振现象较为严重。本文采用模态分析方法,对考虑光伏发电装置的弱互联电网的共振风险进行了分析。首先,建立了光伏系统的谐波模型,以及输电线路、变压器的谐波模型。同时,为了降低特征值计算的复杂度,采用高斯消元法将主电网的谐波模态阻抗转换为连接弱互联电网的PCC节点的谐波模态阻抗。然后以西部某实际弱互联电网为例,采用模态分析方法对其共振风险进行了研究。结果表明,PV的L-C-L滤波器是影响谐振点的主要因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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