3-phase 19-level T-type Multilevel Inverter Based Low Total Harmonic Distortion
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Abstract
A good multilevel inverter design, the output voltage waveform must be a staircase waveform that the step voltage is on the sinusoidal waveform referenced at all levels. As a result is a low total harmonic distortion. Multilevel inverter with high levels is controlled by a space vector method. The output waveform at the high staircase level is outside the sinusoidal waveform referenced resulting in a high harmonic distortion. This paper presents a 3-phase 19-level T-type multilevel inverter which is controlled by adjusting vector position of a space vector method. In order to control the step voltage to be on the sinusoidal waveform referenced at all levels; the vector has been adjusted 18 positions from the original position. The position of the vector indicates the DC link voltage of the 3-phase inverter used for the design which has the position of the switching angle of all 54 switches. The experimental results, a 3-phase induction motor with 4 poles rated ¼ HP is driven by the proposed 3-phase 19- level T-type multilevel inverter. The multilevel inverter produces the total harmonic distortion of the voltage and current at 4.1% และ 1.1%, respectively.
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