Min-Geun Song, Seok-Min Kim, and Kyo-Beum Lee, "Independent Switching Technique to Remove Abnormal Output Voltage in Hybrid Active NPC Inverters," Journal of Power Electronics, vol. 21, no. 1, pp. 85-93, Jan. 2021. -SCIE > Paper

This paper proposes the independent switching technique to remove abnormal output voltage in hybrid active neutral-point clamped (ANPC) inverters.

The hybrid ANPC inverter is composed by mixing the silicon (Si) devices and silicon carbide (SiC) devices, unlike the conventional ANPC inverter

which is generally composed of the Si devices only. The SiC devices provide the low switching losses under the high switching frequency, and the

high withstand ability under the high temperature compared with the Si devices. Therefore, the hybrid ANPC inverter using the SiC devices provides

the low power losses, high efficiency and high reliability compared with the conventional ANPC inverters. In this hybrid ANPC inverter, abnormal

output voltages are generated when the sinusoidal output current crosses the zero-point. The abnormal output voltages are momentary pulses that

must not be generated, and these pulses distort the output current and degrade the power quality. There are two typical causes of these pulses; one

is from the switching operation time difference between switches, and the other is from deadtime. This paper proposes the independent switching

technique to remove the abnormal voltages caused by both of the two above reasons, and the proposed technique is verified by simulation and

experiment.