中文摘要：

自然采样法产生的SPWM脉冲效果最接近正弦波,但工程中不利于实时控制,在实际中常采用的规则采样法精度不够高。基于正弦脉宽调制技术,在规则采样的基础上准确推导了切线法和割线法的开关时间点计算公式。对开关开通和关断时刻的精度进行分析,并对各开关时间点进行了比较,公式得出的数据表明利用切线法和割线法产生的SPWM脉冲最接近于自然采样法产生的脉冲,开关时间点误差小于规则采样法。利用Matlab软件进行仿真,验证了其谐波含量小于规则采样法。

英文摘要：

As the natural sampling method generating SPWM pulses closer to sine wave is impractical in real-time control,the regular sampling method with poor precision is usually adopted in practical projects.Based on the sinusoidal pulse width modulation technology and the regular sampling method,the accurate switching time point calculation formula are derived for the tangent sampling method and secant sampling method.The precision of on-off switching moments are analyzed and the comparison of switching time point shows that,the SPWM pulses generated by the tangent method and secant method are closest to the pulses generated by the natural sampling method and their switching time point errors are smaller than those of the regular sampling method.Simulation with Matlab indicates that their harmonic contents are less than those of the regular sampling method.