一种低硬件资源消耗快速SVPWM算法

发布时间：2019-03-27 06:56

【摘要】：常规SVPWM算法需要进行多次复杂的坐标变换并涉及大量的浮点乘法运算,增加了控制器的运算负荷且占用更多的内存空间。针对这一问题提出快速SVPWM方法,利用压缩变化将基础电压矢量转移至特殊位置,进而可以利用电压矢量变换后的两个分量的符号和大小判断其所在的扇区,无需进行其他数学运算;同时发现双边对称7段SVPWM三相占空比计算的特殊规律,将6个扇区分为3组,每组的2个扇区具有相同的运算规则,基于该发现提出简明扇区判据,只对矢量所属的组别进行判定,由判据结果可以直接获得三相占空比,进一步简化算法,减少了运算量和程序代码长度。通过仿真对算法的可行性进行了验证,同时在以DSP为控制核心的永磁电机实验平台上进行了实验。实验表明,在浮点DSP平台上快速SVPWM算法的运算速度提高了38%,同时减少了程序代码所占的存储空间,节省了45个字节的内存空间。
[Abstract]:The conventional SVPWM algorithm requires many complex coordinate transformations and involves a large number of floating-point multiplication operations, which increases the operation load of the controller and takes up more memory space. In order to solve this problem, a fast SVPWM method is proposed, in which the basic voltage vector is transferred to a special position by means of compression change, and then the sector can be judged by the symbol and size of the two components transformed by the voltage vector. There is no need for other mathematical operations; At the same time, the special rule of SVPWM three-phase duty cycle calculation in 7 segments of bilateral symmetry is found. Six fans are divided into three groups, and the two sectors of each group have the same operation rules. Based on the discovery, a concise sector criterion is proposed. By judging only the group to which the vector belongs, the three-phase duty cycle can be obtained directly from the result of the criterion, which further simplifies the algorithm and reduces the computational complexity and the length of the program code. The feasibility of the algorithm is verified by simulation. At the same time, the experiment is carried out on the permanent magnet motor experiment platform with DSP as the control core. The experimental results show that the fast SVPWM algorithm on floating-point DSP platform improves the operation speed by 38%, reduces the memory space occupied by program code, and saves 45 bytes of memory space.
【作者单位】：北京科技大学机械工程学院;
【基金】：中国博士后基金(2013M530523) 国家自然科学基金(51204017) 北京市重点学科建设项目(HK100080429)
【分类号】：TM301.2

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