Modified Suboscillation Method For Inverter With Third Harmonic Injection

Mohd Iskandar , Abu Yamin (2007) Modified Suboscillation Method For Inverter With Third Harmonic Injection. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The power output and dynamic performance of PWM controlled ac drive can be improved by increasing the inverter output voltage through over modulation. As a result this project is proposed to increase the output voltage in a continuously controllable fashion up to maximum possible value. This project presented the features of control method based on a modified suboscillation method with third-harmonic injection or well known as third-harmonic pulse-width modulation (TIDPWM).This method is optimal in the following ways: increase maximize de bus voltage utilization without over modulation, better performance with low total harmonic distortion, THD of the line current and effectively eliminate the third harmonic component. The analysis and experimental results from the third-harmonic pulse-width modulation (THIPWM) and fundamental (SPWM) method are shown through MA TLAB simulation. Furthermore hardware implementation can be accomplished by uses op-amp 741 integrated circuit for the modulator circuit.

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