摘要
级联H桥型逆变器因器件数量少、易于模块化、控制自由度高等优点,得到了普遍应用。但在传统多电平调制策略下,无法实现级联单元间功率均衡与逆变器输出线电压谐波特性最优的协调控制,输出功率不均衡或输出电压谐波特性较差时会直接影响逆变器输出电压波形质量。为此,该文以载波层叠调制技术为基础,提出一种基于1/2输出周期脉冲循环的功率均衡控制策略,揭示功率均衡条件下的载波分布普遍规律,并将其推广应用至n单元级联拓扑。所提策略在保证逆变器输出电压具有相对最优谐波特性的同时,能够实现单元间的功率均衡控制,消除了功率不均衡的不利影响。仿真和实验结果验证了所提控制策略的有效性。
Cascaded H-bridge inverter has been widely used because of its advantages such as small number of devices, easy of modularization and high degree of control freedom. However, under traditional multilevel modulation strategy, the coordinated control of power balance between cascaded cells and optimal line voltage harmonic characteristics cannot be achieved. Power unbalance or poor output voltage harmonic characteristics will directly affect inverter output voltage waveform quality. In order to overcome this problem, a power balance control strategy, which is based on carrier disposition modulation method and pulse circulation in half a fundamental period, was proposed. The general law of carrier distribution under power balance condition was revealed and the power balance control method can be applied to n-cells topology. The proposed method can not only ensure the relatively optimal harmonic characteristics of inverter output voltage, but also achieve power balance control between cascaded cells, so the adverse effects of power unbalance is eliminated. Simulation and experimental results verify the effectiveness of proposed solution.
作者
陈仲
孙健博
许亚明
汪柯文
CHEN Zhong;SUN Jianbo;XU Yaming;WANG Kewen(Jiangsu Key Laboratory of New Energy Generation and Power Conversion(Nanjing University of Aeronautics and Astronautics),Nanjing 211106,Jiangsu Province,China;Shenzhen Hopewind Electric Co.Ltd,Shenzhen 518055,Guangdong Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第16期5314-5325,共12页
Proceedings of the CSEE
基金
国家自然科学基金项目(51877106)。
关键词
级联H桥
功率均衡
脉冲循环
载波分布规律
概括
cascaded H-bridge
power balance
pulse circulation
carrier distribution law
generalization
作者简介
陈仲(1975),男,博士,副教授,研究方向为功率电子变换、航空电源和电能质量控制,chenz21@163.com;孙健博(1994),男,硕士,研究方向为多电平变换器、轨道交通电力变换技术;许亚明(1991),男,硕士,研究方向为多电平变换器和逆变技术;汪柯文(1995),男,硕士,研究方向为逆变器建模与控制。
