High Power Multilevel PWM current Source GTO Inverter System with PWM Controlled Thyristor Rectifier

提出了一种基于PWM控制晶闸管整流器的大功率多电平PWM电流型GTO逆变器系统。该逆变器系统的主电路结构由PWM控制晶闸管整流器、双连接PWM电流型GTO逆变器、能量反弹电路和两个直流环节滤波电感组成，无需Transformer连接逆变器和感应电动机，可实现双PWM控制电流型GTO逆变器的增容和小型化。设计了该逆变器的脉冲波形，以消除逆变器输出电流中的低次谐波，并对PWM电流型GTO逆变器系统中PWM控制晶闸管整流器在单位基波输入功率因数下的性能进行了分析。沿着的分析和实验结果，整流器的直流电压控制性能的各种值的脉冲数为半周期的电源频率也给出了。作为这项研究的结果，我们发现，它是可能的，以消除指定的低次谐波逆变器输出电流。并利用Pspice仿真软件分析了该逆变器系统的基本特性。

We proposed a new High Power Multilevel PWM Current Source GTO Inverter System with PWM Controlled Thyristor Rectifier. The main circuit configuration of the proposed inverter system is composed of a PWM controlled thyristor rectifier, an double connected PWM current source GTO inverter, an energy rebound circuit, and two dc link filter inductors.This proposed system is able to increase the capacity and downsize a double PWM controlled current source GTO inverter without transformer connecting the inverter and a induction motor. And we devised the pulse-pattern of the proposed inverter to remove the specified lower harmonics of the inverter output current.And also, the performance of PWM-controlled thyristor rectifier operating at unity fundamental input power factor in the PWM current source GTO inverter system for induction motor drive is proposed and analyzed. Along with the analytical and experimental results, the dc voltage control performance of the rectifier for various values of the number of pulses for a half period of the supply frequency is also given. As a result of this research, we find out that it is possible to remove the specified lower harmonics of the inverter output current. And we analyze basic characteristics of the proposed inverter system by using Pspice simulator.