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首页> 外文期刊>Electric power systems research >Adaptive digital notch filter based on online grid impedance estimation for grid-tied LCL filter systems
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Adaptive digital notch filter based on online grid impedance estimation for grid-tied LCL filter systems

机译：基于网格绑定LCL滤波器系统的在线网桥阻抗估计的自适应数字陷波滤波器

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摘要

In grid-connected systems, LCL filters are playing an important role in mitigating the current harmonics as compared with the traditional L filter. Nevertheless, the performance of the LCL filters might deteriorate under the variations in grid impedance conditions resulting in excessive resonance phenomenon and even system instability hazards. The digital notch filter is an effective solution to tackle the resonance frequency problem by eliminating the resonant peak value; however, the prior art is only designed under the consideration of unknown grid impedance. This paper presents a novel implementation of an adaptive digital notch filter based on on-line grid impedance estimation to ensure the robustness against grid impedance variations. Stability analysis to confirm the relationship between the system parameters and grid impedance value is carried out. Furthermore, an extended Kalman filter is applied to design an observer which can estimate the grid impedance accurately. Considering the uncertainty of the real-time system, a lookup table based on the estimated grid impedance value and the control gain is proposed to tune the parameters of the digital notch filter to increase the relative stability of the system. Finally, the effectiveness of the developed adaptive notch filter is verified by both simulation and experimental results under varying grid impedance conditions.
机译：在网格连接的系统中，LCL过滤器在与传统的L滤波器相比，在减轻电流谐波时发挥着重要作用。然而，LCL过滤器的性能可能在电网阻抗条件的变化下劣化，导致过度的共振现象甚至系统不稳定危害。数字陷波滤波器是通过消除谐振峰值来解决谐振频率问题的有效解决方案;然而，现有技术仅在考虑未知网格阻抗的考虑下设计。本文基于在线电网阻抗估计，提出了一种基于在线电网阻抗估计的自适应数字凹口滤波器的新颖实现，以确保对电网阻抗变化的鲁棒性。执行稳定性分析，以确认系统参数和网格阻抗值之间的关系。此外，应用扩展的卡尔曼滤波器来设计一种可以准确地估计电网阻抗的观察者。考虑到实时系统的不确定性，提出了一种基于估计的网格阻抗值和控制增益的查找表来调整数字陷波滤波器的参数以增加系统的相对稳定性。最后，通过在不同的电网阻抗条件下的模拟和实验结果验证了开发的自适应陷波滤波器的有效性。

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