混合多电平逆变器拓扑结构及控制系统  

Hybrid multilevel inverter topology and control system for motor drives

作　　者：饶建业[1] 李永东[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《清华大学学报（自然科学版）》2010年第1期35-39,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家"八六三"高技术项目(2007AA05Z200)

摘　　要：为了提高多电平逆变器的性能及效率,提出一种混合多电平逆变器。该混合逆变器由二极管箝位型逆变器(从逆变器)和H桥逆变器(主逆变器)组成,可以在从逆变器不需要电源供电的情况下,实现稳定的多电平电压输出。采用电压平衡控制算法,可以保持从逆变器悬浮的电容电压稳定。从逆变器采用超级电容作为储能单元,可以提高系统的能量利用效率。仿真和实验结果表明:在电机启动时,储能单元的电容电压可以在不添加额外设备的前提下,完成预充电过程,为电机提供启动尖峰功率。在系统稳定运行时,相比相同开关数的逆变器,该混合逆变器可以实现更多电平数的电压输出。A hybrid cascaded multilevel inverter was developed to enhance the performance and efficiency of motor drive system. The neutral point clamped inverter （conditioning inverter） and the H-bridge inverter （main inverter） are connected together in the system to drive the motor, but only the main inverter is supplied by the DC voltage source. The voltage of the conditioning inverter＇s suspended capacitors is balanced by the control strategy. Super capacitors are used for energy storage to improve system efficiency. Simulations and tests show that the conditioning inverter＇s DC bus voltage can be pre-charged without any additional equipment. The pre-charged energy then provides the peak power when the motor starts. As the motor reaches steady state, the hybrid inverter outputs more voltage to obtain better performance.

关 键 词：混合逆变器 多电平 电机控制 超级电容 

分 类 号：TM351[电气工程—电机]