七开关十五电平逆变器调制策略及功率均衡方法  

Modulation Strategy and Power Balance Method of Seven-switch Fifteen-level Inverter

作　　者：胡文华 郭嘉敏 HU Wenhua;GUO Jiamin(School of Electrical and Automation Engineering,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学电气与自动化工程学院,南昌330013

出　　处：《高电压技术》2022年第9期3700-3709,共10页High Voltage Engineering

基　　金：国家自然科学基金(51567009);江西省科技厅重点研发计划(20192BBE50017)。

摘　　要：传统混合级联三单元十五电平逆变器所需开关管较多,且在传统调制策略下存在输出功率不均衡问题。针对以上问题,提出了一种七开关十五电平逆变器拓扑及其功率均衡方法。该逆变器构成思想为先将直流电源、开关管以及二极管相结合组成基本单元输出正电平,然后经过H桥将电平变为正和负电平,实现输出多电平的功能大大降低了开关器件数量。采用阶梯波合成与特定谐波消除相结合的调制策略,仿真和实验结果表明该功率均衡调制策略能使逆变器3个不同电压等级单元在半周期内实现功率均衡,降低输出电压低次谐波含量。The traditional hybrid cascaded three-unit fifteen-level inverter requires a large number of switching tubes and there is a problem of unbalanced output power under the traditional modulation strategy. Aiming at the above problems,this paper proposes a seven-switch fifteen-level inverter topology and power balance method. The idea of the inverter structure is as follows: firstly, the DC source, switching tube and diode are combined to from a basic cell to output positive level, and then the level is changed to positive and negative levels by an H-bridge to achieve the function of outputting multilevel, which greatly reduces the number of switching tubes. This paper adopts a modulation strategy of combining the step wave synthesis and specific harmonic elimination. Simulation and experimental results show that power balance of three different-voltage-grade units of the inverter can be achieved within a half cycle, and the low-order harmonic content of the output voltage can be reduced.

关 键 词：多电平逆变器 功率均衡 阶梯波 特定谐波消除 平均输出功率 动态性能 

分 类 号：TM464[电气工程—电器]