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首页> 外文期刊>Journal of power electronics >Stability Improvement of Distributed Power Generation Systems with an LCL-Filter Using Gain Scheduling Based on Grid Impedance Estimations
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Stability Improvement of Distributed Power Generation Systems with an LCL-Filter Using Gain Scheduling Based on Grid Impedance Estimations

机译：具有基于电网阻抗估计的增益调度的带LCL滤波器的分布式发电系统的稳定性改进

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摘要

This paper proposes a gain scheduling method that improves the stability of grid-connected systems employing an LCL-filter. The method adjusts the current controller gain through an estimation of the grid impedance in order to reduce the resonance that occurs when using an LCL-filter to reduce switching harmonics. An LCL-filter typically has a frequency spectrum with a resonance peak. A change of the grid-impedance results in a change to the resonant frequency. Therefore an LCL-filter needs a damping method that is applicable when changing the grid impedance for stable system control. The proposed method instantaneously estimates the grid impedance and observes the resonant frequency at the same time. Consequently, the proposed method adjusts the current controller gain using a gain scheduling method in order to guarantee current controller stability when a change in the resonant frequency occurs. The effectiveness of the proposed method has been verified by simulations and experimental results. 【Keywords】Active damping, Distributed power generation, Grid-connected system, Grid impedance estimation, LCL-filter;
机译：本文提出了一种增益调度方法，该方法可提高使用LCL滤波器的并网系统的稳定性。该方法通过估算电网阻抗来调整电流控制器增益，以减少使用LCL滤波器减少开关谐波时发生的谐振。 LCL滤波器通常具有带有共振峰的频谱。栅极阻抗的改变导致谐振频率的改变。因此，LCL滤波器需要一种阻尼方法，该方法可在更改电网阻抗时适用，以实现稳定的系统控制。所提出的方法可以瞬时估计电网阻抗并同时观察谐振频率。因此，所提出的方法使用增益调度方法来调整电流控制器增益，以便在发生谐振频率变化时保证电流控制器的稳定性。仿真和实验结果验证了该方法的有效性。 【关键词】主动阻尼分布式发电并网电网阻抗估计LCL滤波器

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  • 来源
    《Journal of power electronics》 |2011年第4期|p.599-605|共7页
  • 作者

    Dae-Keun Choi; Kyo-Beum Lee;

  • 作者单位

    School of Electrical and Computer Engineering, Ajou University, Suwon, Korea;

    School of Electrical and Computer Engineering, Ajou University, Suwon, Korea;

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