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LCL型三相并网逆变器双闭环解耦控制器设计

, PP. 103-110

Keywords: LCL滤波器,并网逆变器,解耦控制,双闭环

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Abstract:

在带LCL滤波器的三相并网逆变器电流双闭环有源阻尼方案中,精确设计控制器参数有助于提高系统控制性能。本文针对其具体拓扑结构,建立了dq同步旋转坐标系下的数学模型,对dq两轴进行解耦控制。研究基于期望频率特性的电流双闭环控制器的设计方法,并重点分析当系统参数发生变化时,对系统稳定性的影响。该设计方法在已知系统参数的情况下,可以准确地计算出内外环的控制器参数,在保证系统性能的同时获得一定的系统鲁棒性。仿真和样机实验结果都表明,该控制器设计方法可以使带LCL滤波器的三相并网逆变器系统稳定可靠的运行,并获得高质量的并网电流。

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