基于调制波分解的Vienna整流器的调制方法  

Modulation Method of Vienna Rectifier Based on Modulation Wave Decomposition

作　　者：姜卫东[1] 胡业波 张庆岩 王金平[1] 高梁 Jiang Weidong;Hu Yebo;Zhang Qingyan;Wang Jinping;Gao Liang(School of Electrical Engineering and Automation Hefei University of Technology,Hefei 230009 China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《电工技术学报》2023年第16期4339-4352,共14页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金面上资助项目(52077050)。

摘　　要：Vienna整流器是一种控制简单、可靠性高的升压型整流器,被广泛应用到风能发电系统、航空电源以及新能源电动汽车等领域。由于Vienna整流器结构的特性,传统的调制方法会导致电流过零点畸变。因此,该文从调制波分解的角度分析电流过零点畸变产生的原因,针对现有的调制策略存在的不足,在其基础上进行改进,提出一种在维持直流侧中点电压平衡的情况下,可以最大程度地降低电流畸变的调制方法。该文将Vienna整流器的传统空间矢量调制、具有过零钳位的空间矢量调制与所提调制方法进行了比较,通过实验验证了所提调制方法的可行性和优越性。As a three-phase power factor corrector,the Vienna rectifier has the advantages of high reliability and simple control.It is widely used and plays an important role in power unidirectional flow fields,such as communication power supply,electric vehicle,wind power,and aeronautical power supply.Carrier-based pulse width modulation(CB-PWM)and space vector modulation(SVM)are usually used to achieve unity power factor and neutral point voltage balance.However,these modulation methods have the problem of current zero-crossing point distortion,which is also one of the characteristics of Vienna rectifier topology.Different symbols of modulation voltage and current cause current distortion.Many modulation strategies have been proposed to solve the zero-crossing distortion.However,only some can perfectly applied to the full modulation range or the modulation strategy to overmodulate the modulation voltage.This paper presents a modulation method that can minimize the current zero-crossing distortion while maintaining the neutral point voltage balance on the DC side.Because the Vienna output level is limited by the current symbol,this paper uses the dual modulation wave decomposition method to deal with neutral point voltage balance and zero-crossing distortion.Neutral point voltage balance is an important indicator of the stable operation of the Vienna rectifier.An unbalanced neutral point voltage can cause serious DC side offset,leading to over-voltage of power devices and causing danger.In order to balance the neutral point voltage,this paper calculates the average current to be extracted or injected during a carrier cycle by detecting the difference in capacitance voltage between the upper and lower DC sides obtained from the feedback.Combined with the expression of the duty cycle of each level,the zero-sequence voltage to be injected is calculated to balance the neutral point voltage.In order to deal with the current zero crossing distortion,the modulation wave is divided into fixed modulation and free modulation waves.

关 键 词：VIENNA整流器 调制方法 中点电压平衡 电流过零点畸变 

分 类 号：TM461[电气工程—电器]