Hybrid parameter adaptive control of NPC three-level rectifier
牛小兵 1董文浩 1石洁 1周鑫1
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作者信息
1. 大连海事大学船舶电气工程学院,辽宁大连 116026
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摘要
为降低中点箝位型(neutral point clamped,NPC)三电平整流器的电流谐波,在dq同步旋转坐标系下推导出带中点电压耦合项的NPC三电平整流器数学模型,并分析中点电压对电流控制的影响.对模型中的中点电压耦合项和交流侧等效电阻会增大电流谐波及无法通过常规方法进行准确估计的问题,设计一种混合参数自适应的迭代学习控制方法,以进行解耦控制并消除不确定参数的影响.通过构造Lyapunov函数和理论推导验证控制方法的稳定性.在整流器硬件平台上进行试验验证,结果表明,所设计的控制方法可有效降低电流谐波.
Abstract
In order to reduce the current harmonics of the neutral-point-clamped(NPC)three-level rectifier,a mathematical model of the NPC three-level rectifier with a neutral-point voltage coupling term is deduced in dq synchronous rotation coordinate system,and the impact of the neutral-point voltage on the current control is analyzed.The neutral-point voltage coupling term and the equivalent resistance on the alternating current side of the model increase the current harmonics and cannot be accurately calculated by conventional techniques,so a hybrid parameter adaptive iterative learning control method is designed to decouple the control and eliminate the impact of uncertain parameters.The construction of Lyapunov functions and theoretical derivations are used to demonstrate the stability of the control method.Through the experimental verification on the rectifier hardware platform,it is shown that the designed control method can effectively reduce the current harmonics.
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