Wide-Area Active Damper with Adaptive Virtual Resistance

被引：0
|
作者：
Li Z. [1 ,2 ]
Jia Y. [3 ]
Zhang J. [1 ,2 ]
机构：
[1] State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin
[2] Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province, Hebei University of Technology, Tianjin
[3] School of Artificial Intelligence, Hebei University of Technology, Tianjin
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2023年 / 56卷 / 07期
关键词：
current control loop; grid-connected inverter; phase-locked loop; wide-area active damper; wide-area stability;
D O I：
10.11784/tdxbz202204005
中图分类号：
学科分类号：
摘要：
A grid-connected inverter is the power conversion interface between the distributed generation system and the grid. However，with the wide distribution of power，there are long transmission lines and more isolation transformers between the point of common coupling(PCC)and the grid，resulting in a weakened connection between the grid and the generation system，an increase in the equivalent impedance of the grid，and a weakened grid. When the grid-connected inverter is weakly connected to the grid，the phase-locked loop(PLL)and the control of the current control loop of the grid-connected inverter will introduce negative damping in wide areas，which may cause the system to lose stability in wide areas. To solve this problem，a wide-area impedance model of the grid-connected inverter was developed，considering the influence of the PLL，and a wide-area stability criterion based on impedance analysis was proposed. On this basis，a wide-area active damper is designed by paralleling active dampers at the PCC to stabilize the system and connecting them to the PCC to generate a parallel damping resistance at the PCC to dampen the resonances. When the working conditions of the system change，the virtual resistance is adaptively adjusted by extracting the resonant voltage of the PCC and using the method of harmonic content limitation to achieve system stabilization in a wide area. Finally，the equivalent system model of the grid-connected inverter is built in MATLAB/Simulink，and the effectiveness of the wide-area active damper is verified using time-domain simulation. The simulation results show that when the grid-connected inverter is weakly connected to the grid，the PLL and the control of the current control loop will cause wide-area resonance stability problems. The wide-area active damper can effectively suppress resonance over a wide area and stabilize the system when its connection changes suddenly. © 2023 Tianjin University. All rights reserved.
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页码：755 / 766
页数：11
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