【摘要】 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更多还原

【Abstract】 A novel 3-dimensional space vector modulation (3DSVM) technique is proposed as the power quality compensator for a 3-phase 4-wired system. The space vectors’ allocation in 3-dimensional system and the realization of 3D SVPWM is introduced. Different from 2D SVPWM, there are 8 different vectors corresponding to 8 switching modes in 3D SVPWM. The null vectors can not only reduce the switching losses by optimizing the switching state sequences but also compensate the neutral line current. The 3D SVPWM technique under both under-modulation and over-modulation cases are considered. Both simulation and experimental results are given and compared with conventional hysteresis control strategy. It is showed that the 3D SVPWM technique is validity, and better compensation effect can be obtained under the lower switching frequency.更多还原