一种新型的多阶滞环空间矢量控制方法的分析

针对三相PWM整流器的传统滞环控制存在开关频率不固定造成谐波畸变较大以及空间矢量控制需进行大量计算容易造成控制滞后的问题,提出结合滞环电流控制与空间矢量脉宽调制(SVPWM)控制优点的控制方法。介绍了一种新型的基于α,β静止坐标系的多阶滞环空间矢量控制方法,采用α,β静止坐标系避免了三相a,b,c坐标系中相互独立缺乏协调的问题,多阶滞环比较器的运用权衡了开关频率与控制精度间的关系,通过实验验证了该方法具有滞环电流控制和空间矢量控制的优点,并降低了电流总谐波畸变率(THD)。

Analysis of a New Control Method of Multilevel Hysteresis Space Vector

In view of unstable switching frequency result in high harmonic distortion that existed in traditional hystere-sis control strategy and control lag caused by massive calculation in space vector control strategy that used by three-phase PWM rectifier,a method that combine the advantages of hysteresis current control and space vector pulse width modulation(SVPWM) control is proposed.A new control method of multilevel hysteresis space vector is introduced which based on α ,β static coordinate.The use of α ,β static coordinate avoids the problem such as independent and lack of coordination caused by three-phase a,b,c coordinates and the use of multilevel hysteresis comparators well optimize the relationship between switching frequency and control accuracy.This method is verified to have the advan-tages of both hysteresis current control and space vector control,and to reduce current total harmonic distortion(THD).