Study and Implementation of Micro-grid Isolated High-power Bi-directional DC-DC System

• Main Authors: JIAO-DI KE, 柯喬迪
• Other Authors: Jing-Yuan Lin
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/phsaa5

碩士 === 國立臺灣科技大學 === 電子工程系 === 106 === The aim of this thesis is to study and implement a micro-grid isolated high-power bi-directional DC-DC system. It is mainly used in the system of charging and discharging between the DC bus and the battery module in the microgrid. Every unit of the series circuit consist of two stages. The three-phase series resonant circuit converter at the bus side is used as an isolation stage for open-loop control, and the interleaved Buck/Boost converter of the battery side depend on digital chip to achieve closed-loop control. The appropriate circuit mode and current sharing control are achieved by sensing the voltage and current signal of the battery side and bus side. The stage of the battery side consists of two buck/boost converters with interleaved control, which decrease the output current ripple. The stage of DC bus side is a Three-Phase full bridge circuit, there are three isolated transformers and three resonant tanks. The control signal of each phase is offset from the others’ by 120°, which operated as a series resonant region. In order to raise the overall power, parallel two units between the positive point and midpoint of DC bus, the other two units between the midpoint and ground point of DC bus.