Implementation of Single Phase Cascaded H-Bridge Nine Level Inverter and Simulation Study with PI Controller

K. S. Kumar, J. Edward, Kudzai B Chimonyo, Munyaradzi Charles Rushambwa
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引用次数: 2

Abstract

A new single phase cascaded H-bridge nine level inverter is presented in this paper. The PWM technique using multicarrier based PD (phase disposition) strategy is used to generate the pulses with the help of AT89C51 microcontroller. By varying the modulation indices value to 0.25, 0.5, 0.75 and 1, accordingly different levels of output voltages such as 3, 5, 7 and 9 levels can be achieved with R-L load. The working principle of the proposed circuit with different modes is explained in detail. In order to keep the output voltage constant and to have high dynamic performance even in the change in load condition, PI controller is used as a closed loop and verified with MATLAB/SIMULINK. In the proposed 9 level inverter with the modulation index of 1, THD of 13.55% is achieved in the output voltage. Based on power circuit component count and DC source, the proposed inverter is compared with conventional topologies. To verify the performance of the proposed architecture, simulation and experimentations are carried out on a prototype in open loop and the respective results are presented.
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单相级联h桥九电平逆变器的实现及PI控制器的仿真研究
本文提出了一种新型单相级联h桥九电平逆变器。在AT89C51单片机的帮助下,采用基于多载波PD(相位配置)策略的PWM技术产生脉冲。通过改变调制指标值为0.25、0.5、0.75和1,相应的R-L负载可以实现3、5、7、9级输出电压。详细阐述了该电路在不同模式下的工作原理。为了保持输出电压恒定,即使在负载条件变化时也具有较高的动态性能,采用PI控制器作为闭环,并通过MATLAB/SIMULINK进行验证。在调制指数为1的9电平逆变器中,输出电压的THD达到13.55%。基于功率电路元件数和直流电源,与传统拓扑进行了比较。为了验证所提出架构的性能,在开环的原型上进行了仿真和实验,并给出了各自的结果。
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