Research on Adaptability of Grid-Connected Inverter with Complex Coefficient-Filter Structure Phase Locked Loop to Weak Grid

被引：0

作者：

Tu C. ^{[1
]}

Gao J. ^{[1
]}

Li Q. ^{[1
]}

Jiang F. ^{[2
]}

Guo Q. ^{[1
]}

机构：

[1] National Electric Power Conversion and Control Engineering Technology Research Center, Hunan University, Changsha

[2] School of Electrical and Information Engineering, Changsha University of Science and Technology, Changsha

来源：

Diangong Jishu Xuebao/Transactions of China Electrotechnical Society | 2020年 / 35卷 / 12期

关键词：

Complex coefficient-filter; Grid-connected inverter; Impedance criterion; Impedance remodeling; Phase locked loop; Stability margin; Weak grid;

D O I：

10.19595/j.cnki.1000-6753.tces.190619

中图分类号：

学科分类号：

摘要：

According to the traditional synchronous rotating frame PLL (SRF-PLL) grid- connected inverter system, combined with the fundamental positive sequence voltage extraction characteristics of complex coefficient-filter, an grid-connected inverter system with complex coefficient-filter-based PLL (CFPLL-GIS) is constructed. On this basis, considering the influence of PLL, the impedance model of CFPLL-GIS is established. The impedance-based stability criterion analysis shows that the introduction of complex coefficient-filter structure can improve the phase angle of equivalent output impedance of grid-connected inverter system in the middle frequency band, and can significantly improve the adaptability of grid-connected inverter system to weak grid. Meanwhile, taking the loop-gain of the grid-connected inverter system as the design guide, a remodeling control strategy of equivalent output impedance of the grid-connected inverter system is proposed to improve the impedance characteristics of the system, ensuring sufficient stability margin of the grid-connected inverter system and further broadening the adaptive range of the CFPLL-GIS to the grid impedance. Simulation and experimental measurements verify the proposed strategy. © 2020, Electrical Technology Press Co. Ltd. All right reserved.

引用

页码：2632 / 2642

页数：10

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