Frequency-coupled Impedance Model and Stability Analysis of Grid-connected Converter

被引：0
作者：
Liu W. [1 ]
Xie X. [1 ]
Huang J. [2 ]
Zhang C. [1 ]
Yin C. [1 ]
机构：
[1] Department of Electrical Engineering, Tsinghua University, Beijing
[2] Maintenance Branch Company of State Grid Fujian Electric Power Co. Ltd., Fuzhou
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2019年 / 43卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Frequency coupling; Grid-connected converter; Impedance model; Outer-loop control; Stability analysis;
D O I：
10.7500/AEPS20180119007
中图分类号：
学科分类号：
摘要：
Voltage source converters are used for grid connection of photovoltaic energy, wind energy and reactive power compensation in the renewable energy generation system. An emerging kind of oscillation has been observed due to the interactions among converters and AC power grids. In this case, the impedance model analysis has become one of the most promising methods for solving this type of oscillation. However, most of the existing impedance models are focusing on the high-frequency dynamics of converter, while neglecting the impacts of converter outer-loop control and frequency coupling. Therefore, these models are inaccurate when analyzing the medium and low frequency dynamic characteristics (such as the subsynchronous oscillation) of converters. To overcome these defects, this paper proposes a frequency-coupled impedance model of voltage source converter. Both outer-loop control and complementary frequency coupling are considered in this model. And the correctness of the model derivation is verified by the time-domain simulation and identification of detailed electromagnetic model. Based on the proposed impedance model, the overall impedance model of the grid-connected system is further derived to evaluate the system stability. The time-domain simulation has also demonstrated the effectiveness of the frequency-coupled impedance model in the medium and low frequency oscillation analysis. © 2019 Automation of Electric Power Systems Press.
引用
收藏
页码：138 / 146
页数：8
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