二极管钳位型双Buck三电平逆变器输入均压解耦控制  

Decoupling Control of Input Voltage Balance for Diode-clamped Dual Buck Three-level Inverters

作　　者：洪峰[1] 嵇保健[2] 杨伟[1] 王成华[1] 

机构地区：[1]南京航空航天大学信息科学与技术学院,江苏省南京市210016 [2]南京工业大学自动化与电气工程学院,江苏省南京市210009

出　　处：《中国电机工程学报》2012年第9期34-40,7,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50907033);高等学校博士学科点专项科研基金资助项目(20093218120023);南京航空航天大学基本科研业务费专项科研项目(NS2010093)~~

摘　　要：输入电容均压是多电平逆变器的关键问题,多电平调制与输入均压耦合,造成多电平变换器电路结构与控制繁杂、调节速度慢。利用双Buck电路包括2个Buck桥臂、并按电流半周期工作的特点,提出一种二极管钳位双Buck多电平结构,在任一时刻,由其中一个Buck桥臂实现逆变,而另一个Buck桥臂工作于逆向Boost状态,对输入分压电容充电,逆变控制与钳位电压均衡控制可完全解耦。在电平数较多的情形下,该方法有助于减少器件数量,降低系统复杂度,提高可靠性。对三电平情形进行了仿真与实验验证。It is a key problem of multilevel inverter that how to balance voltages of input capacitors. Cause to the coupling of multilevel modulation and input voltage balance, no matter hardware circuit or control method of multilevel inverters are always complex, and speed of voltage balance is low. Dual Buck circuit, which composed of two Buck DC/DC converter bridges, works in current half-period mode. A novel diode-clamped multilevel dual Buck inverter was presented which inherited those features. At any moment, one Buck bridge worked for inverter, another worked as a reverse Boost circuit and charged up input capacitors. So inverter and voltage balance control were completely decoupled. In case that multilevel number is not small, this method is conducive to reduce the number of devices and the system complexity, and improve reliability of the system. Simulation and experiment of a diode-clamped three-level inverter verifies these analysis.

关 键 词：逆变器 多电平 均压 钳位 解耦控制 

分 类 号：TM464[电气工程—电器]