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提出了一种应用于三相四线系统的三维空间矢量脉宽调制 (3DSVPWM)方法。介绍了三维空间中电压矢量的分布以及空间矢量脉宽调制的实现方法。与以往基于二维算法的空间矢量脉宽调制不同 ,在三维空间矢量调制中 ,有 8个不同的空间电压矢量对应于 8组开关模式 ;零矢量的作用也不再局限于减小开关损耗、优化开关序列 ,还可以用来补偿中线电流。这种新型的空间矢量脉宽调制方法被用在三相四线系统中的并联电能质量补偿设备中 ,用来控制一个三桥臂逆变器 ,实现对电流谐波和中线电流的补偿。文中给出了仿真实验的结果 ,并与传统滞环控制方法的实验结果进行了比较 ,验证了该方法的正确性 ,以及具有在较低开关频率下达到较好的补偿效果的优点
A three-dimensional space vector pulse width modulation (3DSVPWM) method for three-phase four-wire system is proposed. The distribution of voltage vectors and the implementation of space vector pulse width modulation in three-dimensional space are introduced. Different from the space vector PWM based on two-dimensional algorithm, in the three-dimensional space vector modulation, there are 8 different space voltage vectors corresponding to 8 switch modes; the effect of zero vector is not limited to reduce the switching loss, Optimize the switching sequence can also be used to compensate for the neutral current. This new space vector pulse width modulation method is used in parallel power quality compensation equipment in three-phase four-wire systems to control a three-leg inverter to compensate for current harmonics and neutral currents. In the paper, the simulation results are given and compared with the experimental results of traditional hysteresis control method. The correctness of this method is verified and the advantages of this method are achieved with better compensation effect at lower switching frequency