一种实现内环电流跟踪的改进无差拍控制方法

发布时间：2018-03-24 21:05

本文选题：变流器　切入点：电流内环　出处：《中国电机工程学报》2017年08期

【摘要】：首先介绍了变流器在??坐标系的离散化数学模型,在此基础上,电流内环采用无差拍控制(deadbeat control,DBC)方法跟踪电流。在实际系统中,由于电感偏差的存在,将影响系统的稳定性;同时,电流采样误差不可避免,将影响电流的控制精度。利用DBC模型在z域的传递函数,分析了系统的稳定性及动态性能。提出了一种改进DBC方法,既能提高系统对电感偏差程度适应性和系统的稳定裕度,又能较好地抑制电流采样误差以提高系统的干扰抑制能力。最后,搭建了三相变流器的实验平台,完成相关实验,验证了所提出控制方法的有效性。
[Abstract]:First of all, introduce the converter in? ? On the basis of discrete mathematical model of coordinate system, the method of deadbeat control control (DBC) is used to track the current in the inner loop of current. In practical system, the stability of the system will be affected by the existence of inductance deviation. The current sampling error is inevitable, which will affect the control accuracy of the current. Using the transfer function of DBC model in z domain, the stability and dynamic performance of the system are analyzed. An improved DBC method is proposed. It can not only improve the adaptability of the system to the inductance deviation and the stability margin of the system, but also suppress the current sampling error so as to improve the interference suppression ability of the system. Finally, the experimental platform of the three-phase converter is built, and the related experiments are completed. The effectiveness of the proposed control method is verified.
【作者单位】：合肥工业大学电气与自动化工程学院;
【分类号】：TM46

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