基于 VSD 变换理论的新型六相 SVPWM 算法

摘要

For six-phase permanent magnet synchronous motor (PMSM)system supplied by two independ-ent voltage source inverters,which has two sets of Y-connected three-phase windings spatially phase shif-ted by 30°,a new six-phase space vector pluse-width modulation (SVPWM)algorithm based on vector space decomposition(VSD)transformation theory was presented.The relationship between the two kinds of commonly used modeling methods for six-phase PMSM was derived,such as double dq modeling and VSD method,and a new synchronous rotating coordinate transformation matrix was proposed based on VSD method.Moreover,the relationship between the proposed synchronous rotating coordinate transfor-mation matrix and double dq coordinate transformation matrix was derived in detail,and a novel six-phase SVPWM method designed to solve the limitation of the traditional six-phase SVPWM algorithm,i.e. two sets of windings reference voltage vector is always equal,and expand the application scope of the exist-ing PWM algorithm.Compared with the other commonly used six-phase SVPWM algorithms,simulation results verify the effectiveness of the proposed algorithm.%针对由2个独立电源供电的相移30°双Y联结的六相永磁同步电机系统，提出了一种基于矢量空间解耦变换理论的新型六相空间矢量脉宽调制(SVPWM)算法。分析了2种常用坐标变换———双dq坐标变换和矢量空间解耦变换之间的关系，并在此基础上提出了一种新型同步旋转坐标变换矩阵。推导了采用新提出的变换矩阵与双dq坐标变换矩阵之间的关系，设计了一种新型的六相SVPWM算法，解决了传统的六相SVPWM算法要求2套绕组的参考电压矢量幅值总是相等的限制，拓展了现有脉宽调制(PWM)算法的应用范围。通过与其他常用的六相SVPWM算法进行仿真实验比较，验证了所提算法的可行性和有效性。