Optimal PWM method based on harmonics injection and equal area criteria

For high power inverters, optimal pulse width modulation (OPWM) is the most popular method to reduce the switching frequency and at the same time realize selected harmonics cancellation. Most published methods for optimal PWM are based on solving multiple variable and high order nonlinear equations. This paper proposes a practical harmonics injection and equal area criteria based method to realize optimal PWM. Compared with traditional methods, this proposed method does not involve complex equation groups and is much easier to be utilized in the cases with many switching angles in wide range of modulation indexes.