A High-Performance Bidirectional DC/DC Converter for Micro-Grid System Applications

• Main Authors: Shu-Wei Kuo, 郭書瑋
• Other Authors: Yu-Kang Lo
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/78050355090995825354

博士 === 國立臺灣科技大學 === 電子工程系 === 102 === This thesis presents a high-performance bidirectional DC/DC converter for micro-grid system applications. The topology is used by the non-isolated half-bridge DC/DC converter. Zero-voltage-switching (ZVS) of power switch is realized with pluse width modulation method. Otherwise, a novel control mechanism is also proposed in this thesis. The concept is added phase-shift mechanism to control at power switch following different output power. Significantly reduces the peak current and RMS current to improve the conversion efficiency at light loads and achieve high efficiency under wide-range load variations. When charging the battery, the constant-current and constant-voltage charging method are satisfied the demands for fast charging. Therefore, a multi-stage charging method depending on the battery voltage is adopted. A digital signal processor (DSP) TMS320F28035 of Texas Instruments is used to implement a 10-kW bidirectional DC/DC converter. The phase-shift mechanism proposed in this thesis through theory and practice tests to verify its feasibility. After complete the tests, the overall load efficiency are above 90 % in discharge mode and above 95 % in charge mode.