一种降低Vienna整流器共模电压的SVPWM方法

A SVPWM Method for Reducing Common-mode Voltage of Vienna Rectifier

Vienna整流器由于其结构简单、性能优良等优点得到广泛应用,传统的七段式空间矢量脉宽调制(SVPWM)方法可以进一步提升整流器性能,但会产生较大的共模电压,引发电磁兼容(EMC)问题,存在安全隐患。分析了Vienna整流器共模电压的产生原因以及直流侧中点电位的平衡条件,重点分析了五段式SVPWM方法对中点电位的影响,并提出了一种五段式SVPWM方法及其中点电位调节方法。最后,通过Simulink软件进行仿真分析并搭建一台1.5 kW的实验样机,验证了该调制控制策略的可行性,能有效降低Vienna整流器的共模电压,并使整流器直流侧中点电位保持稳定。

Vienna rectifier is widely used because of its simple structure and excellent performance.The traditional seven-segment space vector pulse width modulation(SVPWM)method can improve the performance of the rectifier,but it will produce too large common-mode voltage which cause electro magnetic compatibility(EMC)problem and security risk.The cause of common-mode voltage of Vienna rectifier and the balance condition of direct current side neutralpoint potential are analyzed.The influence of five-segment SVPWM on neutral-point potential is analyzedl.A full-range five-segment SVPWM method and a neutral-point potential regulation method are proposed.Finally,a 1.5 kW experimental prototype and a simulation model in Simulink software are built to verify the feasibility of the control strategy which can effectively reduce the common-mode voltage of Vienna rectifier and keep the direct current side neutralpoint potential stable.