一种改进型的SVPWM算法研究

Study on an improved SVPWM algorithm

通常采用的SPWM(space pulse width modulation)算法电压利用率低、谐波多,而一般SVP-WM(space vector pulse width modulation)算法结构复杂。针对以上问题,研究了一种改进型的SVP-WM算法,将输入的两路正交正弦电压Uα和Uβ进行简单的加减及逻辑运算就得到了合成矢量所在的扇区,通过查表便可以得到该扇区基础合成矢量的作用时间,并由此计算出三相合成圆形磁链的作用时间,再根据脉宽调制原理生成圆形磁链脉冲,从而实现了该算法。最后通过仿真验证了算法的正确性,并且运用于异步电机系统中能够实现其功能。

It has a low efficiency and numerous harmonic for the SPWM （space pulse width modulation） algorithm. The structure of SVPWM algorithm is complex. Aiming at these problems, an improved SVP- WM （space vector pulse width modulation） algorithm is studied in this paper. Using simple addition, subtraction and logical operations with the two input orthogonal sinusoidal voltages U^and Us, it got the sector where the synthetic vector was located. Then the action time of basis synthetic vector in this sector could be obtained by means of looking up the table, and thus the action time of three-phase synthetic cir- cular flux was calculated. According to the principle of pulse width modulation, the circular flux pulse could be output. So the algorithm was realized. The rect. And the algorithm applied in the asynchronous results of simulations show that the algorithm is cot- motor system is realized the function.