一种实现VIENNA整流器SVPWM调制效果的快速方法

Quick Method of Implementing SVPWM Modulation Effect for VIENNA Rectifier

针对常规VIENNA整流器的空间矢量脉宽调制SVPWM(space vector pulse width modulation)计算量大、方法过于复杂、实时性要求高的场合应用受到限制的问题,提出了一种可直接实现VIENNA整流器SVPWM的数学优化方法。首先,根据VIENNA整流器数学模型,结合脉宽调制的约束条件,定义了判断区间的新的组合函数和区间划分准则,提出了优化算法,并据此给出了调制公式。然后,重新设计了中点电压平衡算法。最后,通过PSIM仿真和DSP实验,将常规方法与所提方法的调制效果进行比较,验证所述优化调制算法的可行性。

Under the scenario with high real-time requirements,the application of space vector pulse width modulation(SVPWM)of the conventional VIENNA rectifier is limited due to the large amount of computation load and complexity.To solve this problem,a mathematical optimization method which can directly realize the SVPWM of the VIENNA rectifier is proposed in this paper.First,according to the mathematical model of VIENNA rectifier and the constraint conditions for pulse width modulation,a new combination function and an interval partition criterion for judging intervals are defined,and an optimization algorithm is put forward,according to which the modulation formula is given.Then,the midpoint voltage balance algorithm is redesigned.Finally,through PSIM simulations and a DSP experiment,the comparison of modulation effect between the conventional and proposed methods was performed,which verified the feasibility of the proposed optimal modulation algorithm.