Abstract
This paper proposes the design and implementation of a 15kW three-phase T-type inverter. Fuji Electric's new generation IGBT module (V series) using RB-IGBT technology is applied for the converter, due to its higher efficiency from conventional IGBTs to reduce switching losses on the semiconductors. Under full load conditions, the overall efficiency of the converter can reach over 98%. The control design and sine PWM modulation are implemented on a DSP kit named TMS320F3F28379D. In addition, the PWM is generated with the fundamental and third harmonics of a sin wave, allowing a modulation factor up to 1,154 compared to traditional PWM. The output voltage of 220V/50Hz with less than 2% of THD can be achieved at the minimum input DC voltage of 550V.
Highlights
Nowadays, multilevel inverter structures have been researched widely because of advantages such as their modular structure, simple connection, and maintenance ease
Conventional IGBTs can oparate at maximum switching frequency of about 20kHz and the power losses are very high. To deal with this problem, the RB-IGBT technology is used in this research to reduce power losses [6,7]
This paper presents the design of the Pulse Width Modulation (PWM) method along with a voltage-current control, which is embedded on a TMS320F3F28379D DSP kit
Summary
Multilevel inverter structures have been researched widely because of advantages such as their modular structure, simple connection, and maintenance ease. The output voltage of the T-type multilevel inverter reduces harmonics. The dimension of the reactive filter components and the amount of switching devices of the T-type inverter are reduced significantly, which improves the overall efficiency of the system. Conventional IGBTs can oparate at maximum switching frequency of about 20kHz and the power losses are very high. To deal with this problem, the RB-IGBT technology is used in this research to reduce power losses [6,7]. Fuji's IGBT switches are produced for integrating with T-type structure which makes operation more reliable and efficient [8]. The experiment results verify the effectiveness of the proposed method in improving the system's efficiency
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