Enhanced Stability of Capacitor-Current Feedback Active Damping for LCL-Filtered Grid Converters

被引：0

作者：

Xin, Zhen ^{[1
]}

Wang, Xiongfei ^{[1
]}

Loh, Poh Chiang ^{[1
]}

Blaabjerg, Frede ^{[1
]}

机构：

[1] Aalborg Univ, Dept Energy Technol, Aalborg, Denmark

来源：

2015 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) | 2015年

关键词：

Capacitor current; active damping; grid inductance variation; stability; second-order generalized integrator; power electronics; voltage-source converter; DESIGN; INVERTER; ROBUSTNESS;

D O I：

暂无

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The proportional capacitor-current feedback active damping method has been widely used to suppress the LCL-filter resonance. However, the time delay in the damping control loop may lead to non-minimum phase or even unstable responses when the resonance frequency varies in a wide range. To improve the robustness of damping, this paper proposes an improved damping controller with the capacitor current feedback loop, which is based on the second-order generalized integrator, instead of a proportional gain, which can effectively mitigate the detrimental effect of the time delay. Robustness of the proposed method against grid inductance variation is proved by z-domain and s-domain analyses. Finally, experimental results validate the effectiveness of the proposed method on a three-phase grid connected converter.

引用

页码：4729 / 4736

页数：8

共 22 条

[1]

[Anonymous], IEEE T POWER ELECT

[2]

Barrena JA, 2006, IEEE IND ELEC, P1773

[3] Investigation of Active Damping Approaches for PI-Based Current Control of Grid-Connected Pulse Width Modulation Converters With LCL Filters [J].