基于数字滤波器的lcl滤波并网逆变器高鲁棒主动阻尼设计

Pei Cai, Xiaohua Wu, Yongheng Yang, W. Yao, Wenjie Liu, F. Blaabjerg
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引用次数: 13

摘要

在并网的lc滤波逆变器中需要阻尼。由于被动元件造成的额外功率损失,主动阻尼更有利。作为一种主动阻尼解决方案,基于单回路滤波器的阻尼直接插入到电流控制器中,不需要额外的传感器和简单的特点,因此在lc滤波逆变器中受到了广泛的关注。然而,由于频率特性的限制,现有的基于滤波器的阻尼效果并不理想。例如,针对低LCL谐振频率而设计的陷波滤波器,由于其相位引线过多,在高谐振频率下不能很好地工作,这意味着一个滤波器不足以覆盖由参数漂移引起的所有可能的LCL谐振频率,这表明不必要的重复设计和通用性差。因此,本文提出了一种基于类陷波数字滤波器的单环主动阻尼方法,该方法覆盖范围广,可达奈奎斯特频率。也就是说,该方法对LCL滤波器参数漂移和网格阻抗变化具有鲁棒性。仿真结果验证了该方法的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Design of Digital Filter-based Highly Robust Active Damping for LCL-filtered Grid-tied Inverters
Damping is required in grid-connected LCL-filtered inverters. Due to additional power losses caused by passive elements, active damping is more favorable. As an active damping solution, the single-loop filter-based damping, being directly plugged into the current controller, features no extra sensors and simplicity, and thus it has drawn much attention in LCL-filtered inverters. However, the existing filter-based damping is not very satisfactory because of limited frequency characteristics. For example, the notch filter designed for a low LCL-resonance frequency does not function well for a high resonance frequency owing to its overmuch phase lead, which means that one filter is not sufficient to cover all possible LCL resonance frequencies caused by parameter drifts, indicating unnecessary repetitive designs and poor universality. Thus, this paper proposes a notch-like digital filter-based single-loop active damping method, which covers a wide range of frequencies up to the Nyquist frequency. That is, the proposed is robust against LCL filter parameter drifts and grid impedance variations. Simulation results verify the proposed method.
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