Optimum design of single-phase cascade multilevel inverter using ohesw technique

الملخص EN

The traditional two or three levels inverter does not completely eliminate the unwanted harmonics in the output waveform.

Therefore, using the multilevel inverter as an alternative to traditional PWM inverters is investigated.

This paper describes the Optimized Harmonic Elimination Stepped Waveform OHESW technique to improve the output waveform quality of multilevel inverter fed induction motor.

A new method is presented where switching angles are computed such that a desired fundamental sinusoidal voltage is produced while at the same time certain higher order harmonics are eliminated.

He proposed method also is used to minimize the Total Harmonic Distortion THD of the synthesized multilevel waveform.

The THD is investigated over a wide range of possible output control voltages and number of voltage levels used to synthesize the output waveform.

Simulation results of a cascade multilevel inverter under OHESW technique with 5- up to 15-levels are used to eliminate the (3rd-13th) harmonics.

A prototype single-phase cascade 7- level inverter loaded by single-phase induction motor is investigated.