Single Current Feedback Control for LCL Grid-connected Inverter Based on Tracking Differentiator

2020 IEEE 4th Information Technology, Networking, Electronic and Automation Control Conference (ITNEC) Pub Date : 2020-06-01 DOI:10.1109/ITNEC48623.2020.9084749

Dazhi Liu, X. Zong, Xingong Cheng, Chunlei Dai

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Abstract

LCL filter is widely used in grid-connected inverter system. Compared with $L$ filter, it has good attenuation effect on high harmonics. However, LCL filter is a third-order system with low damping, and is very easy to resonate. Active damping is an effective measure to solve the resonance problem of LCL filter. The traditional grid-connected current feedback active damping is difficult to extract differential signals, poor dynamic performance and poor noise suppression. Therefore, single current feedback control strategy for LCL grid-connected inverter based on tracking differentiator is proposed in this paper. The third-order tracking differentiator (TD) is designed to extract the second-order differential signal of the grid-connected current as the feedback control of active damping in order to suppress the resonance and the noise. As a result, performance of the dynamic response when the grid-connected current is suddenly changed and the noise suppression are improved. Simulation results demonstrate the effectiveness of the proposed method.

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基于跟踪微分器的LCL并网逆变器单电流反馈控制

LCL滤波器广泛应用于并网逆变器系统中。与$L$滤波器相比，它对高次谐波具有良好的衰减效果。然而，LCL滤波器是一个低阻尼的三阶系统，很容易产生谐振。主动阻尼是解决LCL滤波器谐振问题的有效措施。传统的并网电流反馈有源阻尼难以提取差分信号，动态性能差，噪声抑制效果差。为此，本文提出了基于跟踪微分器的LCL并网逆变器单电流反馈控制策略。设计三阶跟踪微分器(TD)提取并网电流的二阶微分信号作为主动阻尼的反馈控制，以抑制谐振和噪声。从而提高了系统在并网电流突变时的动态响应性能，提高了系统的噪声抑制能力。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。

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来源期刊

2020 IEEE 4th Information Technology, Networking, Electronic and Automation Control Conference (ITNEC)

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