Novel Capacitor Current Feedback Active Damping Strategy for Extending the Range of Equivalent Virtual Damping

被引：0

作者：

Liu H. ^{[1
]}

Bian X. ^{[1
]}

Zhang W. ^{[1
]}

Cao Y. ^{[2
]}

Chen J. ^{[1
]}

机构：

[1] Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education, Northeast Electric Power University, Jilin

[2] Marketing Service Center (Measurement Center, Capital Intensive Center) of State Grid Xinjiang Electric Power Co., Ltd., Urumqi

来源：

Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Active damping; Delay; LCL inverter; Resonance shift; Robustness; Weak grid;

D O I：

10.13336/j.1003-6520.hve.20211111

中图分类号：

学科分类号：

摘要：

In order to solve the problem of narrow valid damping region in the traditional capacitive-current feedback active damping(CCFAD) control strategy, we propose an improved CCFAD strategy based on negative first-order low-pass filter. The traditional CCFAD can only guarantee the stability of the LCL inverter system in the frequency smaller than fs/6. When connecting into weak grids, the change of the grid impedance will lead to resonance shift. If the fr is greater than fs/6, the robustness will be greatly deteriorated. The advanced CCFAD strategy can compensate the phase lag caused by delay and expand the system stability range by introducing the NFOLPF into the capacitor-current feedback branch. By analyzing the active damping characteristics, the effective damping region can be extended to fR, where fR∈(fs/3, fs/2). Meanwhile, the relationship between the coefficient of the NFOLPF and the maximum damping range and Lg is given. Simulation analysis and experimental results show that the control strategy proposed in this paper can expand the effective damping range and improve the system stability in weak grid compared with the existing compensation strategy. © 2022, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：114 / 124

页数：10

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