混合九电平逆变器功率均衡的调制策略  

Modulation Strategy for Power Balance of Hybrid Nine-level Inverter

作　　者：顾军[1] 杜治斌 李平[1] 宋飞 张维国 张明 GU Jun;DU Zhibin;LI Ping;SONG Fei;ZHANG Weiguo;ZHANG Ming(School of Electrical and Information Engineering,Auhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学电气与信息工程学院,淮南232001

出　　处：《电源学报》2025年第1期67-75,共9页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51607003)。

摘　　要：对于直流侧电压比为1:1:2的混合级联H桥逆变器,若采用混合载波层叠调制策略,虽无电流倒灌现象且输出电压谐波性能良好,但会出现低压单元输出功率不均衡的问题。针对该问题,首先进行功率不均衡分析,然后提出1种改进的混合调制策略,对高压单元进行阶梯波调制,对低压单元进行PWM,且2个低压单元对调制波采用不同的处理方式。所提策略在保留输出电压具有良好谐波性能的同时减少三角载波使用数量,简化了控制过程,且具有倍频效果。接着,对所提策略进行优化,对低压单元开关信号进行逻辑运算,可在2个载波周期内解决低压单元功率不均衡的问题。最后,通过仿真和实验证明了所提策略的可行性。For a hybrid cascade H-bridge inverter with a DC-side voltage ratio of 1:1:2,if the hybrid carrier disp-osition modulation strategy is adopted,the problem of output power imbalance in the low-voltage unit will occur al-though there is no current backflow phenomenon and the harmonic performance of output voltage is good.To solve this problem,the power imbalance is analyzed at first.Then,an improved hybrid modulation strategy is proposed,under which the high-voltage unit performs step wave modulation and the low-voltage unit performs PWM,and two low-voltage units adopt different processing methods for the modulation wave.The good harmonic performance of output voltage is kept,the number of triangular carriers is reduced,and the control process is simplified,with a frequency doubling effect.Third,this strategy is optimized,and the switching signal of low-voltage unit is logically calculated,which can solve the power imbalance problem of low-voltage unit in two carrier cycles.Finally,the feasibility was proved by simulation and experimental results.

关 键 词：逆变器 混合调制 三角载波 逻辑运算 功率均衡 谐波含量 

分 类 号：TM464[电气工程—电器]