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The effect of Harmonic Distortion Reduction on Three Phase Three level Inverter Using Neutral Point Control  

Kim, Jeong Gyu (Semiconductor Engineering of CheongJu University)
Yang, Oh (Semiconductor Engineering of CheongJu University)
Publication Information
Journal of the Semiconductor & Display Technology / v.17, no.3, 2018 , pp. 90-94 More about this Journal
Abstract
In this paper, we applied a three-level T-type inverter with the one more voltage level than two-level inverter. However, the three-level T-type inverter has a systematic problem with voltage unbalances. So neutral point control is essential. Therefore, the voltage unbalance problem of the three - phase inverter was confirmed to be controlled within 5V using the neutral point control algorithm in charge and discharge mode. In addition, total harmonic distortion was reduced in three phases (u phase, v phase, w phase) when neutral point control was performed in charging mode and also in three phases (u phase, v phase, w phase) in discharge mode. In this paper suggests a neutral point control algorithm to solve the voltage unbalance of a three-level T-type inverter, and shows the improvement of the performance of the proposed algorithm through experiment.
Keywords
3-Level T-type Inverter; Total harmonic distortion(THD); Neutral point control; Charge.Discharge mode;
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