A new approach of dead-time compensation for voltage-fed PWM inverter

The dead time necessary to prevent the short circuit of the power supply in pulse width-modulated (PWM) voltage inverters results in output voltage errors. Voltage distortion due to the dead time effects produces fifth and seventh harmonics in the phase currents of the stationary reference frame, and a sixth harmonic in the d- and q-axis currents of the synchronous reference frame, respectively. The proposed method can be easily implemented by feedforwardly adding compensation voltages to the output reference voltage of the synchronous PI current regulator. The technique is evaluated through simulation and experimental results.