Dissertation > Excellent graduate degree dissertation topics show

Study on Wavelet Networks Applied in Buck Converters

Author: ChenBaoCi
Tutor: ShiJiYing
School: Tianjin University
Course: Theory and New
Keywords: Soft-switching Wavelet Network BUCK converter Network weights initialization The method of least squares
CLC: TM46
Type: Master's thesis
Year: 2005
Downloads: 134
Quote: 0
Read: Download Dissertation

Abstract


This paper introduces the characteristics of nonlinear control system of the status quo and the soft-switching power converter; followed by application of a modular ideological analysis of the working process of the zero-current switching Buck Converter Buck converter zero current work using Laplace transform established state the exact discrete iterative mathematical model, reduced due to the difficulty of the additional resonant element to the equation of state of the system in different situations. Analyzed inverter steady state operating conditions, the simulation experiment, and the Buck converter obtained by the simulation waveform data using wavelet analysis tool to determine the difference between the stable operation and non-stable operation of the Buck converter for better control the application of wavelet network to provide theoretical guidance. Control advantages of wavelet network is that it combines neural network learning ability and by learning adaptive wavelet analysis of non-stationary random signal has a good local characteristics of the frequency domain and zoom capability, which makes the wavelet network has better approximation performance and approximation speed. The paper theoretically elaborated framework of wavelet network, the choice of the wavelet function, the initialization of the network parameters, the determination of the hidden layer nodes and parameter adjustment algorithm optimization of all aspects of the design, and integrated treatment based on the nonlinear parameters online adjusted to optimize control and other aspects of the problem. Finally, the simulation experiments, two different control models, a wavelet network control for Buck converter using fuzzy wavelet network control, and the other for the Buck ZCS-PWM converter. The wavelet network control with a new set of initial weights, application of organic combination of the Levenberg-Marquart algorithm and the method of least squares optimization algorithm for network parameter adjustment. Fuzzy wavelet network control the use of two-stage learning strategy, the use of Extended Kalman Filtering the algorithm adjustment nonlinear parameters, least-squares refinement ownership value. Finally, in MATLAB simulation, two control results and voltage feedback control for comparative analysis. This paper combines the advantage of the characteristics of the power converter and wavelet network control theory, wavelet theory is introduced into the field of soft-switching; application of wavelet analysis tool for the Buck converter stable operation with non-stable run waveform analysis; wavelet network control theory, and successfully design the control circuit model for simulation, optimization of the control parameters, and the intelligent control of the power system.

Related Dissertations

  1. Development of the Method for RPV Fast Neutron Fluence Calculation,TL32
  2. Ozone generator power inverter Research and Design,TM464
  3. Switching power saving technology,TN86
  4. Study on Engineering Drawings Vectorization,TP391.41
  5. The Application of Control Theories to JIT Manufacture,F224
  6. Analysis of Calculation Accuracy of Element-Free Galerkin Method and the Treatment of Essential Boundary Conditions,O302
  7. Non-negative Matrix Factorization Algorithm Based on Method of Least Square and Its Applications,O151.21
  8. Study on the Synthesis of Tmpde and the Measurement of Vapor-Liquid Equilibrium of the Mixture,TQ225.2
  9. Research of Planar Passive Integration for LLC Resonant Converter,TM46
  10. The Research of High Power Factor Correction and Soft Switching Inverter,TM921.51
  11. HID Headlight Based MCU Development for Train,TM923.45
  12. High-frequency Soft-switching Rectifier Voltage Regulator Circuit Technology and Power Factor Crection,TM46
  13. The Research of MPPT Control in Grid-connected PV System Based on Soft Switching Technique,TM615
  14. The Design and Research of the High Power and Frequency Water Cooling Switching Power Supply Controlled by DSP,TN86
  15. Construction Monitoring and Control of Tied-arch Bridge with Flying Swallow,U448.225
  16. Study on Prepaid Intelligent Heat Meter Based on MSP430,TH81
  17. The Research of Sculpture Surface Point Distribution Strategy and Error Evaluation Method,TH161
  18. Study of Ground Points Extraction and Curving Surface Fitting Algorithm from ALS Data,TP722
  19. Research on Technologies of Multi-patterns Network Traffic Generation,TP393.06
  20. Design of 200W LED Driver with Style of Active-Clamp Forward Switching Power Supply,TN312.8
  21. Comparative Analysis of Ambiguity Resolving Method Based on LAMBDA Method,P228.4

CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter
© 2012 www.DissertationTopic.Net  Mobile