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A Novel Asymmetric Three-Phase Cascaded 21 Level Inverter Fed Induction Motor Using Multicarrier PWM with PI and Fuzzy Controller
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作者 A. Abdul Namith T. S. Sivakumaran 《Circuits and Systems》 2016年第11期3922-3950,共29页
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 wh... 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. 展开更多
关键词 multilevel multicarrier Level Shifting Pulse Width modulation MC-LS-pwm Proportional Integral PI and Fuzzy Logic Controller
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多电平逆变器多载波PWM调制策略的研究 被引量:11
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作者 周京华 杨振 苏彦民 《电气传动》 北大核心 2005年第1期23-27,共5页
介绍了多电平逆变器的思想,对多电平逆变器不同的拓扑结构进行了比较,研究和分析了用于多电平逆变 器不同的多载波PWM调制策略。通过对未滤波的逆变器输出电压的谐波分析,对不同调制方法在线性调制区的谐波 特性进行了比较。同... 介绍了多电平逆变器的思想,对多电平逆变器不同的拓扑结构进行了比较,研究和分析了用于多电平逆变 器不同的多载波PWM调制策略。通过对未滤波的逆变器输出电压的谐波分析,对不同调制方法在线性调制区的谐波 特性进行了比较。同时,也提出了一种混合的调制策略。分析了不同调制策略在不同的电平数下所具有的特性。讨论 了逆变器电平数的增加对于输出电压频谱的影响,也研究了过调制对于输出电压频谱的影响。 展开更多
关键词 多电平逆变器 pwm调制 输出电压 谐波分析 谐波特性 在线 滤波 多载波 频谱 拓扑结构
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A Novel Multilevel Inverter Employing Additive and Subtractive Topology
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作者 V. Prasannamoorthy P. Sundaramoorthi Merin Jacob 《Circuits and Systems》 2016年第9期2425-2436,共12页
As the demand for high voltage, high power inverters are increasing and there is a problem of connecting a power semiconductor switch directly to a high voltage network. As a part of this the multilevel inverters had ... As the demand for high voltage, high power inverters are increasing and there is a problem of connecting a power semiconductor switch directly to a high voltage network. As a part of this the multilevel inverters had been introduced. As a part of this, several researches had been done for the development of multilevel inverters. The commercially available and extensively studied topologies for multilevel voltage output are Neutral Point Clamped (NPC), Cascaded Half Bridge (CHB) and Flying Capacitor (FC) converters. However, with these existing topologies, there is a significant increase in the number of power switches and passive components. Thus it leads to more complex control circuitry and overall cost of the system increase with increase in the output levels. In this paper, a novel multilevel inverter is proposed in which it employs additive and subtractive topology to get higher output levels. This approach significantly reduces the number of power switches needed as compared to existing topology. The present developed multilevel inverter can generate only five voltage levels. With this proposed topology the multilevel inverter can be modified to nine-level inverter. Moreover modified hybrid multicarrier Pulse Width Modulation (PWM) technique can be implemented in the proposed multilevel inverter in order to obtain uniform switch utilization and lower THD. An appropriate modulation scheme is presented and also the proposed concept is analyzed through simulation studies. 展开更多
关键词 multilevel Inverter (MLI) Pulse Width modulation (pwm) multicarrier pwm Scheme Additive and Subtractive Topology Total Harmonic Distortion (THD)
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一种多电平逆变器的分析方法与仿真 被引量:5
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作者 薛俊伟 王庆贤 《兰州交通大学学报》 CAS 2006年第3期100-102,106,共4页
近年来,为了解决逆变系统中主开关低耐压值与电力系统中高电压值直接匹配的矛盾,多电平逆变器在大功率场合应用越来越广泛.提出并分析了五电平逆变器的思想和工作原理,提出了适用于五电平逆变器的多载波调制技术,并对其输出电压进行了... 近年来,为了解决逆变系统中主开关低耐压值与电力系统中高电压值直接匹配的矛盾,多电平逆变器在大功率场合应用越来越广泛.提出并分析了五电平逆变器的思想和工作原理,提出了适用于五电平逆变器的多载波调制技术,并对其输出电压进行了仿真分析. 展开更多
关键词 多电平逆变器 脉宽调制 谐波 多载波pwm
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