Adaptive Control Design for the Buck-Boost Converter with Desired Pole/Zero Assignment

• Main Authors: Jen-Chen Zhou, 周振城
• Other Authors: Chung-Shi Tseng
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/78409178173223479751

碩士 === 明新科技大學 === 電機工程研究所 === 96 === In this thesis, an adaptive digital control scheme is proposed for the buck-boost converter using the desired pole/zero assignment approach. The controller design is based on the small signal model of the buck-boost converter and the sensitivity function to meet the internal stability requirement. The control design of the buck-boost converter is a challenging work because the system, which is a non-minimum phase (NMP) system, has a right half-plane zero. In the case that the plant parameters are well known, through the sensitivity function a digital controller for the buck-boost converter with desired pole/zero assignment is proposed to meet the requirements of internal stability for the closed-loop system. In the case that the plant parameters are uncertain (or unknown), through the sensitivity function a digital adaptive controller for buck-boost converter with desired pole/zero assignment is also proposed using the recursive least-squares (RLS) algorithm to satisfy the requirement of internal stability for the closed-loop system. A projection algorithm is also proposed for the estimated parameters to satisfy the characteristics of poles and zero where poles should be inside the unit circle and zero should be outside the unit circle, respectively. To verify the validity of the proposed digital controller for the buck-boost converter, numerical simulations are performed using Matlab. Form these simulations, the estimated parameters can approach their actual values of the plant parameters using the recursive least-squares algorithm and the output voltage can be regulated by the proposed adaptive digital controller. Finally, experimental set-up is built for the buck-boost converter and the fully digital adaptive controller is implemented by a digital signal processor TMDXEZ28335. From the experimental results, the proposed adaptive digital controller has sound performance for the buck-boost converter. The proposed method is simple and is suitable for practical control design for the buck-boost converter.