逆变器消谐模型的数字化方法及其控制误差分析

Digitalized Method of the Inverter Harmonic Elimination Model and Its Error Analysis

基于泰勒级数和一致逼近方法研究了消谐脉宽调制 (PWM )模型的数字化方法 ,并对数字化模型的求解结果与实际模型结果进行了比较 ,证明数字化处理后虽然会给计算结果带来一些误差 ,但对特定的低阶次谐波影响很小 ,即使在考虑了定时控制所带来的误差以后 ,其输出频谱也是令人满意的 .试验验证表明 :该方法的计算结果是令人满意的 ,逆变器带电机运行平稳 ,电流波形接近正弦波 .

The digitalized methods of harmonic elimination PWM (pulse width modulation) control model by using Taylor series and identical approximation is studied.The digitalized model calculation results are compared with the actual model calculation results.There is a little error while the digitalized model is used, but its influence on some special low order harmonics is much little. The output spectrum is also satisfied even if the timing control error is considered.The experiments show that the results calculated by the digitalized model are satisfied, the machine runs smoothly, and its current wave is approximately sinusoidal.