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首页> 外文期刊>Circuits and systems >A Novel Asymmetric Three-Phase Cascaded 21 Level Inverter Fed Induction Motor Using Multicarrier PWM with PI and Fuzzy Controller
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A Novel Asymmetric Three-Phase Cascaded 21 Level Inverter Fed Induction Motor Using Multicarrier PWM with PI and Fuzzy Controller

机译：基于PI和模糊控制器的新型非对称三相级联21级逆变器异步电动机。

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摘要

Multilevel inverters are gaining popularity in high power applications. This paper proposes a new ladder type structure of cascaded three-phase multilevel inverter with reduced number of power semiconductor devices which is used to drive the induction motor. The ultimate aim of the paper is to produce multiple output levels with minimum number of semiconductor devices. This paper uses only 11 switches along with 3 diodes and 4 asymmetrical sources to produce an output voltage of 21 levels. The modulation technique plays a major role in commutation of the switches. Here we implement the multicarrier level shifting pulse width modulation technique to produce the commutation signals for the inverter. The proposed multilevel inverter is used to drive the three-phase induction motor. The mathematical modeling of three-phase induction motor is done using Simulink. Furthermore the PI and fuzzy logic controllers are also used to produce the reference waveform of the level shifting technique which in turn produces the commutation signals of the proposed multilevel converter. The controllers are used to control the speed of the induction motor. The effectiveness of the proposed system is proved with the help of simulation. The simulation is performed in MATLAB/Simulink. From the simulation results, it shows that the proposed multilevel inverter works properly to generate the multilevel output waveform with minimum number of semiconductor devices. The PI and fuzzy logic controller performances are evaluated using the results which indicate that with the help of controllers the harmonics has been reduced and the speed control of induction motor is achieved under different loading conditions.
机译：多电平逆变器在大功率应用中越来越受欢迎。本文提出了一种新型梯形结构的级联三相多电平逆变器，其功率半导体器件的数量减少了，用于驱动感应电动机。本文的最终目的是用最少数量的半导体器件来产生多个输出电平。本文仅使用11个开关以及3个二极管和4个非对称电源来产生21个电平的输出电压。调制技术在开关换向中起主要作用。在这里，我们实现了多载波电平移位脉冲宽度调制技术，以产生用于逆变器的换向信号。所提出的多电平逆变器用于驱动三相感应电动机。使用Simulink完成了三相感应电动机的数学建模。此外，PI和模糊逻辑控制器还用于生成电平转换技术的参考波形，进而生成所提出的多电平转换器的换向信号。控制器用于控制感应电动机的速度。仿真结果证明了所提系统的有效性。仿真在MATLAB / Simulink中执行。从仿真结果可以看出，所提出的多电平逆变器可以正常工作，以最少的半导体器件数量产生多电平输出波形。使用结果评估了PI和模糊逻辑控制器的性能，这些结果表明在控制器的帮助下，谐波已减少，并且在不同负载条件下均可实现感应电动机的速度控制。

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