T-S Fuzzy Chaotic Control for Buck DC-DC Converters

• Main Authors: Shiao-Chin Chung, 鍾曉春
• Other Authors: 王順源
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/ryge4e

碩士 === 國立臺北科技大學 === 電機工程系研究所 === 101 === This thesis mainly investigates the bifurcation and chaos suppression of buck DC-DC converters by using the Takagi-Sugeno (T-S) fuzzy controller. Firstly, a nonlinear converter is represented in the form of T-S fuzzy system and then controller gain matrices can be obtained by solving the linear matrix inequalities (LMI). Moreover, this study uses the MATLAB/SIMULINK software to simulate and observe, in the presence of variations of input voltage and load resistances, the output voltage characteristic, inductance current and the corresponding phase plane when the bifurcation and chaos phenomena occur at cycle 1, cycle 2 and the cycle 4, respectively. To control the chaotic system, a T-S fuzzy controller is introduced to change the output dynamics. From the simulation results, it is found that the converter output dynamics remain at cycle 1 trajectory with the proposed T-S fuzzy controller. It verifies that the proposed controller has good control performance and the chaotic phenomenon is suppressed.