基于TPWM的CHB多电平逆变器功率均衡策略研究  

Research on Power Balance Strategy of CHB Multilevel Inverter Based on TPWM

作　　者：叶满园 任威 吴韩 章俊飞 陈乐 YE Manyuan;REN Wei;WU Han;ZHANG Junfei;CHEN Le(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》2020年第8期2749-2759,共11页High Voltage Engineering

基　　金：国家自然科学基金(51767007);江西省工业科技支撑计划(20192BBEL50011);江西省自然科学基金(20192BAB206036);江西省教育厅自然科学基金(GJJ190312).

摘　　要：针对级联H桥(cascaded H-bridge,CHB)多电平逆变器载波空间层叠(carrier disposition,CD)调制策略直流电压利用率低和各级联H桥单元输出功率不均衡的问题,提出了一种基于功率均衡的同相层叠梯形波脉宽调制(IPD-TPWM)策略,该调制策略既能在选取合适的梯形波三角化率δ值的条件下,保证输出线电压波形质量的同时大幅提高CHB逆变器输出电压基波幅值;又能通过改变三角载波的排列方式,从而实现在全调制比范围内各H桥单元在一个输出周期内的功率均衡。从而解决了直流电压利用率低和各级联单元输出功率不均衡的问题,并且该功率均衡控制方法相对简单,简化了控制难度,可以非常方便地应用于N电平CHB逆变器的场合。最后搭建了Matlab/Simulink仿真模型和实验平台,仿真和实验研究证实了该调制策略的有效性和切实性。In accordance with the problems of low utilization rate of DC-side voltage of cascaded H-bridge(CHB)multi-level inverter carrier disposition(CD)modulation strategy and unbalanced output power of each cascaded H-bridge units,a power balanced based on in-phase disposition trapezoidal pulse width modulation(IPD-TPWM)strategy is proposed in this paper.By selecting an appropriate trapezoidal wave triangulation rateδ,the modulation strategy can greatly increase the amplitude of output line voltage fundamental wave of CHB inverter while ensuring the waveform quality of output phase voltage;meanwhile,by changing the arrangement of the triangular carriers,the power of each H-bridge unit in one output period is achieved within the full modulation ratio range Equilibrium.Therefore,this modulation strategy solves the problems of low utilization of DC voltage and unbalanced output power of all levels of interconnection units.Moreover,the power balance control method is relatively simple,which simplifies the difficulty of control and can be easily applied to N-level CHB inverters.Finally,the Matlab/Simulink simulation model and experimental platform are built.The simulation and experimental research verify the validity and practicality of the modulation strategy.

关 键 词：级联H桥多电平逆变器 梯形波脉宽调制 直流电压利用率 功率均衡 三角化率δ 

分 类 号：TM464[电气工程—电器]