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首页> 外文期刊>IEEE Transactions on Energy Conversion >Return Ratio Shaping Approach to Stabilize Inverter-Weak Grid System
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Return Ratio Shaping Approach to Stabilize Inverter-Weak Grid System

机译：返回比率整形方法稳定逆变器弱网格系统

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The article presents a corrective control philosophy of a grid tied inverter for adapting the instability incurred at the Point of Common Coupling (PCC) due to uncertainty in the utility grid. It has been observed that the converter impedance which is dependant on the control system loop have a considerable impact on the stability. Therefore, the proposed philosophy explores the participation of the control parameters in shaping the return ratio trajectory which consequently modifies the stability margins of the system. A sensitivity function has been formulated which gives the gradient of each point in the return ratio trajectory to changes in the control parameters. The formulated function has an additional advantage of being grid parameter independent, thus increasing robustness and reducing complexity. An adaptive multi-variable, multi-degree of freedom feedback philosophy using the sensitivity gradients has been proposed to dynamically reach the optimum value of the control parameters in case of grid impedance change. The result shows that the proposed philosophy successfully brings stability to the system in the presence of a weak grid. As well as it preserves the dynamic performance requirements of the converter control.
机译：本文介绍了一种矫正控制型逆变器，用于在公用事业网格中的不确定性引起在共同耦合（PCC）处产生的不稳定性。已经观察到，取决于控制系统环路的转换器阻抗对稳定性具有相当大的影响。因此，所提出的哲学探讨了控制参数在成形返回比轨迹时的参与，从而改变了系统的稳定性边缘。已经制定了灵敏度函数，其给出了返回比轨迹中的每个点的梯度以改变控制参数。配制功能具有独立于网格参数的额外优点，从而增加了鲁棒性和减少复杂性。已经提出了使用灵敏度梯度的自适应多变量，多度自由度反馈哲学，以动态达到电网阻抗变化的控制参数的最佳值。结果表明，拟议的哲学成功地将系统的稳定性带来了弱网格的存在。以及保留转换器控制的动态性能要求。

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