## What is/are Three Level Converters?

Three Level Converters - In this paper, by analyzing the harmonic characteristics of half-wave symmetric SHEPWM and smooth switching conditions, the proper simultaneous switching point is derived, and then a multi-mode hybrid modulation strategy based on half-wave symmetric SHEPWM suitable for three-level converters is obtained.^{[1]}The proposed approach is developed for both two-level and three-level converters and validated by experiments.

^{[2]}Neutral-point (NP) voltage imbalance is an inherent issue of three-level converters.

^{[3]}The proposed topology replaces the conventional three-level converters in the secondary side by only two controlled devices and four diodes while still maintaining the basic functionality of a three-level converter.

^{[4]}Space vector modulation (SVM) strategy is widely used in two-level and three-level converters because of its advantages.

^{[5]}Owing to the superior performance of enhancement mode gallium-nitride (GaN) transistors and Silicon Carbide (SiC) MOSFETs, this paper presents efficiency comparisons for GaN/SiC based two-level and three-level converters.

^{[6]}Bidirectional three-level converters have a wide range of applications, such as those used in electric vehicles (EVs).

^{[7]}In this paper, an efficient model predictive control (MPC) using virtual voltage vectors for three-phase three-level converters is proposed.

^{[8]}A three-level bidirectional AC-DC converter with H8 topology is proposed to combine the advantages of both neutral-point clamped and flying-capacitor three-level converters for medium voltage AC-DC solid-state transformer applications.

^{[9]}It also simplifies measurement process, avoids complicated math operation, and improves measurement accuracy in applications of assessing capacitance of the multiple-node systems, for example, three-level converters.

^{[10]}The three-level converters have an inherent problem of the neutral-point (NP) voltage unbalance due to the split dc-link capacitors.

^{[11]}The three level converters have an inherent problem of the neutral point (NP) voltage unbalance due to the split dc-link capacitors.

^{[12]}