基于重复控制的APF补偿电流控制方法的研究

发布时间：2018-01-08 00:00

本文关键词：基于重复控制的APF补偿电流控制方法的研究　出处：《东北大学》2014年硕士论文　论文类型：学位论文

【摘要】：在工业自动化水平不断提高的今天,各个行业随着电力电子设备的普及得到了迅猛的发展。但与此同时,电网中的电力电子装置以及非线性负载也给电力系统注入了大量的谐波电流及无功电流,造成了电网电能质量问题。由于其重要性以及紧迫性,谐波问题得到了国内外学者的重视与研究,具有重大的理论及现实意义。目前,有源电力滤波器被公认为为治理电网谐波污染最有效的手段之一,具有广阔的研究与应用前景,成为电力电子技术中的一个研究热点。目前有源电力滤波器的主要研究方向包括其拓扑结构、谐波电流检测算法以及补偿电路控制方法。本文首先介绍了APF的分类,并基于三相三线制并联型有源电力滤波器,分析了它的拓扑结构以及工作原理,并依据系统结构特点建立了有源电力滤波器的数学模型,给出了谐波检测系统的算法及结构图,为下述研究工作打下了基础。有源电力滤波器补偿电流的控制精度,决定着谐波补偿效果的优劣。提升有源电力滤波器的电流补偿效果,关键在于如何减小补偿电流对参考电流的跟踪误差、提高跟踪精度。采用传统的PID控制器,控制效果及稳定性并不理想。重复控制是基于内模原理的新型控制策略,由于内模中包含跟踪误差的数学模型,在理论上能完全消除系统的稳态误差。通过对重复控制器的性能分析,为增强系统的稳定性及稳态跟踪性能,对传统的重复控制器进行了改进,引入了改进型内模及补偿器,在保证系统稳定的同时,提高了系统稳态控制性能。为提高系统的动态响应,介于PI控制器动态响应速度快的特点,本文采用了重复控制与PI控制相结合的方法,分别对并联及串联两种结合方式进行了研究,并对两种控制系统进行了详细设计。最后,利用UATLAB/Simulink仿真软件对两种控制系统进行了建模与仿真,并对仿真结果做出了比较与分析,证明了基于重复控制的复合控制策略可以有效地提高有源电力滤波器的稳态补偿精度,并保证了系统较快的动态响应速度,验证了本文采用的控制策略的正确性以及可行性。
[Abstract]:With the continuous improvement of the level of industrial automation, various industries with the popularity of power electronic equipment has been rapid development, but at the same time. Power electronic devices and nonlinear loads also inject a lot of harmonic and reactive currents into the power system, which cause power quality problems, because of its importance and urgency. Harmonic problem has been paid attention to and studied by domestic and foreign scholars, which has great theoretical and practical significance. At present, active power filter is recognized as one of the most effective means to control harmonic pollution. It has a broad research and application prospects, and has become a research hotspot in power electronics technology. At present, the main research direction of active power filter includes its topology. Harmonic current detection algorithm and compensation circuit control method. Firstly, this paper introduces the classification of APF, and based on three-phase three-wire shunt active power filter, analyzes its topology and working principle. The mathematical model of active power filter is established according to the structural characteristics of the system, and the algorithm and structure diagram of the harmonic detection system are given. For the following research work, the control accuracy of active power filter compensation current determines the effect of harmonic compensation, and improves the current compensation effect of active power filter. The key is how to reduce the tracking error of compensation current to the reference current and improve the tracking accuracy. The traditional PID controller is adopted. Repetitive control is a new control strategy based on the principle of internal model, because the internal model contains the mathematical model of tracking error. In theory, the steady-state error of the system can be completely eliminated. By analyzing the performance of the repetitive controller, the conventional repetitive controller is improved to enhance the stability and steady-state tracking performance of the system. The improved internal model and compensator are introduced to ensure the stability of the system and improve the steady-state control performance of the system. In order to improve the dynamic response of the system, the speed of dynamic response of Pi controller is high. In this paper, the combination of repetitive control and Pi control is used to study the parallel and serial control respectively, and the two control systems are designed in detail. The two control systems are modeled and simulated by UATLAB/Simulink software, and the simulation results are compared and analyzed. It is proved that the compound control strategy based on repetitive control can effectively improve the steady-state compensation accuracy of the active power filter and ensure the faster dynamic response speed of the system. The correctness and feasibility of the control strategy are verified.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761;TN713.8

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