A Capacitor-Current-Feedback Active Damping Control Strategy With Phase Lead Compensation for LCL-Type Grid-Connected Inverter

被引：0
作者：
Zhang, Xieyan [1 ]
Xie, Yixuan [1 ]
Wu, Renwei [1 ]
机构：
[1] Hunan Normal Univ, Coll Informat Sci & Engn, Changsha 410081, Peoples R China
来源：
IEEE ACCESS | 2024年 / 12卷
关键词：
Damping; Digital control; Regulators; Lead; Inverters; Resonance; Frequency response; Delays; Impedance; Frequency control; Grid-connected inverter; LCL filter; capacitor-current-feedback active damping; digital control; phase lead compensation; ROBUSTNESS;
D O I：
10.1109/ACCESS.2024.3497004
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
Capacitor-current-feedback (CCF) active damping is widely used to deal with the hazard of LCL filter resonance in the grid-connected inverter based on either phase lead or lag compensation, and the effect of active damping on open-loop of the control system can be evaluated directly by its equivalent impedance. However, the principle of phase compensation for active damping is not clear, and it is difficult to point out how to regulate the compensator to achieve the desired effect of virtual impedance. This paper presents a comprehensive investigation of active damping control of the LCL-type grid-connected inverter. Firstly, the effect of digital control delay on unstable poles of CCF active damping and the principle of phase compensation are identified by analyzing the frequency response of the inverter system. Subsequently, the designs of CCF active damping with phase lead compensation and proportional resonance regulator are studied to guarantee the performance of the inverter system, where a novel solution is given to find the frequencies of phases with -180 degrees crossings, which is essential to the design of control parameters. Finally, the effectiveness of the proposed method has been validated by the experimental results.
引用
收藏
页码：193663 / 193675
页数：13
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