【作者】 李梓；

【导师】 夏明超；

【作者基本信息】 北京交通大学 ， 电气工程， 2012， 硕士

【摘要】 本课题研究了当前所采用的大容量功率转换系统的主电路拓扑结构和碳化硅功率开关器件在变换技术方面的应用；针对目前大容量功率转换系统存在的一系列问题,提出了以采用新一代碳化硅功率器件的高频隔离式的双向DC/DC变换单元作为直流电池单元和DC/AC变换单元的核心接口电路,以链式多电平变换器作为交流侧电网接入电路,并通过DC/DC变换单元形成公共直流母线的基于碳化硅功率器件的智能功率转换系统。设计了智能功率转换系统的主电路拓扑结构的两大构成单元和相应的基本控制策略；通过PSCAD电磁暂态仿真验证了系统主电路拓扑结构和控制系统设计的有效性,并对基于不同功率器件的DC/DC组成单元在损耗和效率特性等方面进行了一定的对比；最后在基于SiC/Si功率器件的高频隔离式的双向DC/DC变换器的物理实验装置上,证明了采用SiC功率器件的高频隔离式的双向DC/DC变换器较传统Si功率器件的变换器在传输功率的效率上得到了大幅提高,并在体积、成本和噪声污染等方面有所改善。提高了系统功率的传输效率,有利于系统装置的模块化设计。更多还原

【Abstract】 This topic researched the main circuit topology of the large capacity power conversion systems and silicon carbide power switching devices used in transform technology. According to series of questions existing in the large-capacity power conversion system, putted forward a high-frequency isolated bi-directional DC/DC converter unit which based on new generation of SiC power devices, that as core interface circuit of the direct current battery unit and the DC/AC conversion unit, a chain multi-level converter AC side of the grid access circuit and through the DC/DC conversion unit to form a public direct current bus intelligent power conversion system based on silicon carbide power devices. The paper designed the main circuit topology of the two component unit of smart power conversion system and the corresponding control strategy. Through PSCAD electromagnetic transient simulation to verify the effectiveness of the system, the main circuit topology and control system design, and based on the different power devices a DC/DC component units of the loss and efficiency characteristics of contrast; Finally, in the high-frequency isolated power devices based on SiC/Si bi-directional DC/DC converter physics experiment device, in which proved that the use of SiC power device bidirectional high-frequency isolated DC/DC converter in the transmission power efficiency than conventional Si power devices converter has been a substantial increase and improvement in terms of volume, cost and noise pollution. Improved the power transmission efficiency of the system and conducive to modular design of the system devices.更多还原