混合H桥级联型多电平逆变器调制策略优化控制  

Optimized control of modulation strategy for hybrid H-bridge cascaded multilevel inverter

作　　者：张云[1] 孙力[1] 赵克[1] 王要强[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150001

出　　处：《电力自动化设备》2010年第5期63-66,共4页Electric Power Automation Equipment

摘　　要：为提高混合H桥级联型多电平逆变器的运行性能,提出了一种新型锯齿载波交错相移混合调制策略。该调制策略把复杂的混合拓扑"化归"到已有调制策略的拓扑,再利用重构的调制波进行调制。该策略充分利用调制波的自由度,在三相正弦波中注入特定的混合分量进行优化控制,使得相电压在1/3基波周期内不进行PWM调制,并能保证输出线电压质量。所提出的优化控制方法能提高15.5%直流电压利用率,还能减少1/3高频功率开关的开关次数,优化了逆变系统的运行性能。实验结果验证了提出方法的可行性和有效性。To improve the operational hybrid modulation strategy with staggered performance of hybrid H-bridge cascaded multilevel inverter,a and phase-shifted saw-tooth carriers is proposed. The complicated hybrid topology is converted into the topology with well-known modulation strategy and modulated by the recomposed modulation wave. It makes full use of the freedoms of the modulation wave and injects the special hybrid components into the three-phase sine wave for optimized control,which ensures the quality of output line voltage though there is no phase voltage PWM modulation within one third of fundamental period. The optimized control not only brings the increase of 15.5 % in DC voltage utilization and the decrease of 1/3 in switching number of high frequency power switch,but also enhances the operating performance of inverter system. Experimental results verify its feasibility and validity.

关 键 词：混合多电平逆变器 混合调制策略 优化控制 直流电压利用率 高频功率开关 

分 类 号：TM464[电气工程—电器]