针对五相电压源型逆变器(VSI)空间矢量脉冲宽度调制(SVPWM)算法中计算量大、运算复杂和实时性差的问题，提出一种基于调制函数的五相SVPWM等效算法。根据PWM算法中调制波和载波相比较的对称规则采样思路，在判断参考电压矢量所在扇区之后，直接计算出五相PWM信号的调制函数；当出现饱和现象时，利用简单的限幅操作取代传统算法中的除法运算。理论分析结果表明，所提出的等效算法避免了复杂的坐标变换和三角函数运算，能够有效提高计算精确度和速度。实验结果验证了该方法的可行性和有效性。%In order to solve the problems of complex operation and poor real-time characteristic in the space vector pulse width modulation (SVPWM) algorithm of five-phase voltage source inverter (VSI), a equivalent SVPWM algorithm based on modulation functions is proposed. According to the theory of PWM symmetrical and regular sampling in which the modulated wave compares with the carrier, the modulation functions can be directly calculated after judging the reference voltage vector is in which sector. When saturation phenomenon occurred, the division operation in the traditional algorithm was replaced by limit-ing the amplitude of modulation functions. The theoretical analysis shows that the proposed method avoids complex coordinate transformations and trigonometric calculations, and the calculation accuracy and speed are improved effectively. The correctness and availability of the proposed method are validated by the experiment results.
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