Dissertation > Excellent graduate degree dissertation topics show

Study of Intelligent Control and Its Application in Active Power Filter

Author: XueYanJun
Tutor: XueZuo
School: Tianjin University of Science and Technology
Course: Detection Technology and Automation
Keywords: Harmonic Active Power Filter Instantaneous Reactive Power Theory Fuzzy Neural Network Controller DSP
CLC: TN713.8
Type: Master's thesis
Year: 2008
Downloads: 91
Quote: 0
Read: Download Dissertation

Abstract

Active Power Filter (Active Power Filter-APF) is a new type of power electronic devices that can be used to power system harmonic and reactive current compensation. Suppression method compared with the traditional harmonic and reactive current, active power filter has a lot of technical advantages and good prospects for development. Active power filter needs to have strong real-time and accuracy of work characteristics, and thus it is possible to fully absorb the advantages of modern signal processing and intelligent control technology and many other disciplines, to achieve the function of active power filter optimization the same time, improve the performance of active power filter. This paper first introduces harmonic pollution and its serious dangers of domestic and foreign technical overview of the development of active power filter and harmonic suppression. Three-phase shunt active power filter as the research object, the content of their works, topology, in the form of the main circuit, PWM control strategies are discussed, and the compensation capacity of 50kVA for 380V, active power filter control study. Design based on systematic analysis of instantaneous reactive power theory of harmonic current detection scheme, and uses an adaptive linear neural network theory is applied to non-linear load current harmonic current detection method, the basis of theoretical analysis on this paper, the method was simulated, the simulation results show that the method has a good real-time and high detection accuracy and adaptive tracking load current changes. Since the active power filter is non-linear and strong coupling of complex systems, it is difficult to establish a precise mathematical model, thus making intelligent control technology has great potential in the Active Power Filter. Paper, fuzzy control with single neural element control for active power filter DC side voltage control, simulation results show that, compared with the conventional PI control method, the two control methods have played a good control effect. In addition, this paper also designed a simple structure, do not rely on the plant model of fuzzy neural network controller (Fuzzy Neural Network Controller-FNNC), and apply it to the current compensation circuit of active power filter, FNNC Active Power Filter attempt simulation results demonstrate the FNNC has excellent control quality, is feasible and effective in the control of APF. Therefore, the intelligent control technology used in active power filter, optimized to achieve the function of active power filter, but also improve the performance of active power filter. Based on the actual compensation to determine the overall system control objectives and overall structure. TMS320F2812 DSP chip as the control core, proposed embodiment of the digital control system of the active power filter, given the preliminary design of the control system hardware circuit design and software control flow.

Related Dissertations

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Filtering techniques,the filter > Active filter
© 2012 www.DissertationTopic.Net Mobile