Sze Sing Lee and Kyo-Beum Lee, "Dual-T-Type Seven-Level Boost Active-Neutral-Point-Clamped Inverter," IEEE Transactions on Power Electronics, vol. 34, no. 7, pp. 6031–6035, Jul. 2019. -SCI > Paper

The conventional three-level active-neutral-point-clamped (ANPC) inverter requires high dc-link voltage at least twice the peak of

ac output. To reduce the dc-link voltage, a recent topology that enhanced the voltage gain from half to unity has been presented. 

In this letter, an alternative ANPC topology is established by using two T-type inverters. Two floating capacitors with self-voltage 

balancing capability are integrated to achieve a voltage-boosting gain of 1.5. In addition, the proposed topology is capable of 

generating seven voltage levels. Its operation is validated through circuit analysis followed by experimental results of a prototype.