基于神经网络控制的有源电力滤波器研究
发布时间：2018-07-27 17:44
【摘要】：随着电力电子技术的快速发展,其应用也越来越广泛,由此导致电网污染愈发严重。有源电力滤波器(APF)是治理电网谐波的一种行之有效的方法,是电能质量控制领域中的研究热点。近些年来,将现代控制理论应用于APF研究受到了人们的重视,其中神经网络以其较强的非线性映射能力为APF研究开辟了新径。在前人研究基础上,将神经网络与PI控制理论结合设计APF控制器,对硬件电路进行合理设计。本文主要研究任务与结果: 1.分析APF研究现状与特点及研究中存在的问题,总结比较谐波检测和电流控制方法的优缺点,在APF设计中采用神经网络进行谐波检测。 2.深入分析有源电力滤波器原理,建立三相并联型APF数学模型,在采用多元自适应神经网络进行谐波电流检测的同时结合PI调节对直流侧电压进行有效控制,采用三角载波实现电流跟踪控制。 3.设计并联型三相四线制APF系统,建立其电路模型,进行硬件和软件设计。为提高装置实时性设计AD同步采集电路,将硬件互锁设计与软件死区设计结合提高装置安全可靠性;设计硬件锁相环提高补偿效果;为使滤波系统取得更好补偿性能,设计输出滤波器以对系统装置的输出电流中的高次谐波予以有效抑制。 4.采用Matlab7.1仿真软件对系统进行仿真,在仿真的基础上以DSP为核心控制器对系统实验研究,搭建APF试验装置。仿真和实验结果表明采用所改进的控制策略使APF对谐波和无功功率进行有效补偿,APF系统具有较好的补偿实时性和有效性。
[Abstract]:With the rapid development of power electronics technology, its application is becoming more and more extensive, resulting in more and more serious power grid pollution. Active power filter (APF) is an effective method for harmonic control of power network, and it is a hotspot in the field of power quality control. In recent years, people pay more attention to the application of modern control theory to the study of APF, in which the neural network has opened up a new path for the study of APF with its strong nonlinear mapping ability. On the basis of previous research, the APF controller is designed by combining neural network and Pi control theory, and the hardware circuit is designed reasonably. The main research tasks and results are as follows: 1. This paper analyzes the research status and characteristics of APF and the problems existing in the research, summarizes and compares the advantages and disadvantages of harmonic detection and current control methods, and adopts neural network to detect harmonics in the design of APF. 2. The principle of active power filter (APF) is deeply analyzed, and the mathematical model of three-phase parallel APF is established. The DC side voltage is effectively controlled by using multivariate adaptive neural network to detect harmonic current and Pi regulation. Use triangular carrier to realize current tracking control. 3. The parallel three-phase four-wire APF system is designed, its circuit model is established, and the hardware and software are designed. In order to improve the real-time design of AD synchronous acquisition circuit, combining hardware interlock design with software dead-zone design to improve the safety and reliability of the device, to design hardware phase-locked loop to improve the compensation effect, to make the filter system obtain better compensation performance, The output filter is designed to effectively suppress the high order harmonics in the output current of the system device. 4. Matlab7.1 simulation software is used to simulate the system. On the basis of the simulation, the system is studied with DSP as the core controller, and the APF test device is built. The simulation and experimental results show that the improved control strategy can compensate the harmonic and reactive power effectively.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TN713.8
本文编号：2148654
[Abstract]:With the rapid development of power electronics technology, its application is becoming more and more extensive, resulting in more and more serious power grid pollution. Active power filter (APF) is an effective method for harmonic control of power network, and it is a hotspot in the field of power quality control. In recent years, people pay more attention to the application of modern control theory to the study of APF, in which the neural network has opened up a new path for the study of APF with its strong nonlinear mapping ability. On the basis of previous research, the APF controller is designed by combining neural network and Pi control theory, and the hardware circuit is designed reasonably. The main research tasks and results are as follows: 1. This paper analyzes the research status and characteristics of APF and the problems existing in the research, summarizes and compares the advantages and disadvantages of harmonic detection and current control methods, and adopts neural network to detect harmonics in the design of APF. 2. The principle of active power filter (APF) is deeply analyzed, and the mathematical model of three-phase parallel APF is established. The DC side voltage is effectively controlled by using multivariate adaptive neural network to detect harmonic current and Pi regulation. Use triangular carrier to realize current tracking control. 3. The parallel three-phase four-wire APF system is designed, its circuit model is established, and the hardware and software are designed. In order to improve the real-time design of AD synchronous acquisition circuit, combining hardware interlock design with software dead-zone design to improve the safety and reliability of the device, to design hardware phase-locked loop to improve the compensation effect, to make the filter system obtain better compensation performance, The output filter is designed to effectively suppress the high order harmonics in the output current of the system device. 4. Matlab7.1 simulation software is used to simulate the system. On the basis of the simulation, the system is studied with DSP as the core controller, and the APF test device is built. The simulation and experimental results show that the improved control strategy can compensate the harmonic and reactive power effectively.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TN713.8
【引证文献】
相关硕士学位论文 前1条
1 唐鑫鑫;基于预测控制策略的有源滤波器的研究[D];江南大学;2012年
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