一种减小四象限级联型变换器母线电容纹波电压的控制方法  

The Method to Reduce DC Bus Voltage Ripple for Novel Four-Quadrant Cascade Multi-Level Inverter

作　　者：张宏亮[1] 周鹏[1] 

机构地区：[1]郑州航空工业管理学院,郑州450046

出　　处：《电气技术》2016年第7期68-74,共7页Electrical Engineering

基　　金：河南省科技攻关计划项目(152102210137);航空基金项目(2015ZD55005);郑州航空工业管理学院青年基金项目(2015133001)

摘　　要：在交流电动机调速领域,传统级联型多电平变换器的应用越来越广泛,但是由于无法实现能量回馈,因而应用场合受到限制。通过采用有源PWM整流模块取代不控整流模块可以实现能量回馈,但是由于PWM整流模块输入侧需要滤波电感,导致系统体积和成本增加,限制这种实现方式的实际应用。传统级联型变换器模块的逆变侧采用的是H桥拓扑,导致母线电容纹波电压非常大,需要较大的母线电容,增加了模块的体积和成本。本文提出一种采用输入变压器的付边漏感取代滤波电感的方式,同时提出了一种新颖的控制方式,通过对PWM整流模块控制实现减小母线电容纹波电压,这就样可以减小母线电容,进而降低系统成本,虽然会导致模块PWM整流模块输入电流变差,但是由于存在三相谐波相抵消特性以及通过PWM整流模块的载波移相处理,变压器原边输入电流谐波非常低。理论分析和仿真证明,这种控制方式是可行的。In AC motor VSD area, Traditional cascade multi-level inverter is widely used, but this type of converter could not realize the energy regeneration, so used in limited area. Through integrating PWM rectifier into traditional H-bridge inverter, the cascade inverter could realize energy regeneration. But PWM rectifier module need filter inductance, this will increase the converter＇s space and cost, so it is also not widely used in application. The inverter side of cascade converter module is H bridge inverter, so the ripple of DC bus voltage is very large, this will also increase the converter＇s space and cost, This paper proposed a method of using transformer＇s leakage inductancce instead of filter inductance, This method can reduce system＇s space and cost. This paper also proposed a new method to reduced DC bus voltage ripple by controlling PWM rectifier, the DC bus capacitor and its cost can be reduced. The input current of PWM rectifier is deteriorated, but the three phase harmonic current can be canceled, so the harmonic current has no effect on transformer input current. The phase-shifted SPWM technology is used in the cascade inverter to reduce harmonious of input current. Analysis and simulation results indicated validity and feasibity.

关 键 词：级联型多电平变换器 四象限 PWM整流器 载波移相 

分 类 号：TM46[电气工程—电器]