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首页> 外文期刊>Sustainable Energy, IEEE Transactions on >A Novel Control Technique for Grid-Tied Inverters Considering Unbalanced Grid Voltage Conditions and Control Input Saturation
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A Novel Control Technique for Grid-Tied Inverters Considering Unbalanced Grid Voltage Conditions and Control Input Saturation

机译：考虑不平衡电网电压条件和控制输入饱和的并网逆变器控制新技术

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摘要

This paper presents a new method to design a current controller for grid-tied inverters under both balanced and unbalanced grid voltage conditions. The proposed controller consists of combining a feedback-output controller with a disturbance observer (DO). The control design is carried out in the alpha beta reference frame. Thus, the objective of the composite controller is to ensure that the output of the system tracks a sinusoidal reference signal with zero steady-state error. A feedback controller only cannot achieve a good tracking performance because of the presence of model uncertainties and unknown disturbances. To account for the natural mismatch between the actual system and the mathematical model, the system dynamics are first augmented with an additional state-variable, representing the disturbance, and the feedback controller is designed based on the assumption that the disturbance input is available for feedback. Then, an observer is constructed to estimate the disturbance, which is assumed to be a sine wave oscillating at the grid frequency. Another feature of the DO is its ability to compensate for the effect of the saturation blocks required to limit the control input during transients, leading to improved dynamic performance. Several experimental tests were conducted to verify the effectiveness of the proposed controller, and the results demonstrated its capability to achieve accurate fast stable responses.
机译：本文提出了一种在平衡和不平衡电网电压条件下为并网逆变器设计电流控制器的新方法。提出的控制器包括将反馈输出控制器与干扰观测器（DO）组合在一起。控件设计在alpha beta参考框架中进行。因此，复合控制器的目的是确保系统的输出跟踪稳态误差为零的正弦参考信号。由于存在模型不确定性和未知干扰，因此反馈控制器仅无法获得良好的跟踪性能。为了解决实际系统与数学模型之间的自然不匹配问题，首先使用表示干扰的附加状态变量来增强系统动力学，然后基于以下假设设计反馈控制器：干扰输入可用于反馈。然后，构造观察者以估计扰动，该扰动被假定为以电网频率振荡的正弦波。 DO的另一个功能是能够补偿在瞬态期间限制控制输入所需的饱和模块的影响，从而改善了动态性能。进行了几次实验测试，以验证所提出控制器的有效性，结果证明了其实现准确快速稳定响应的能力。

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