Aiming at the complex expression and tedious derivation process, the paper discussed the analysis method to the ripple current. The universal ripple current formulations for space vector PWM (SVPWM) were given and a programming algorithm for ripple current analysis for the multi-level inverter was proposed. Finally, the ripple currents and harmonic distortion factor (HDF) expressions for a two-level inverter and a three-level one were analyzed using the algorithm, which verifies the convenience

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... and practicability of the algorithm. It provides a powerful tool for accurately comparing the harmonic distortion performance among different PWM strategies and different level inverters, and even applicable to exploiting new PWM strategy.