混合H桥级联逆变器的优化调制  

Modified Modulation of H-Bridge Hybrid Cascaded Inverters

作　　者：何凯益 任磊[1] 邓翔[1] 陈轶涵[1] 龚春英[1] 

机构地区：[1]江苏省新能源发电与电能变换重点实验室(南京航空航天大学),南京210016

出　　处：《电工技术学报》2016年第14期193-200,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51377079)

摘　　要：两路电压比为1∶2的H桥混合级联结构可实现七电平的输出,有助于提高逆变器的功率密度。在采用多层载波层叠的调制方法下,低压单元一个桥臂开关管工作在高频,另一桥臂开关管工作在低频,两个桥臂开关管热量分布不均导致系统寿命/可靠性降低。提出一种优化调制策略,在保证输出特性和效率不变的情况下,使两个单元的开关管最高工作频率降低为原来的1/2,同时每个单元的四个开关管工作应力相同,有助于提高系统寿命/可靠性。最后通过仿真和实验验证了优化调制策略的可行性和有效性。The topology of H-bridge hybrid cascaded with voltage ratio 1∶2 can achieve seven-level output to improve power density. With the modulation of multi-carrier stacked, the switches of one bridge in the low voltage unit are working at high frequency, and the switches of the other bridge are working at low frequency. The uneven heat distribution will shorten the life of the device and endanger the system. Therefore, this paper presents a modified modulation. By maintaining the same output characteristics and efficiency, the max switch working frequency of each unit can be reduced by half, and all the switches of each unit can work at the same state. The modified modulation is helpful to increase the life of the switches and the stability of the system.

关 键 词：混合H桥级联 多电平逆变器 多层载波层叠调制 优化控制 

分 类 号：TM464[电气工程—电器]