I. Introduction
Multilevel inverters (MLIs) are predominantly used in various industrial power conversion systems including wind-energy, motor drives, power conditioning, railway traction, high-voltage direct current transmission, and large-scale energy storage and photovoltaic energy systems [1]. The MLI output voltage levels can be easily increased by adding flying capacitors and switching devices/diodes to the converter [2]. By doing so, the MLIs can handle higher operating voltage with low-voltage (LV) semiconductor devices, while meeting the harmonic standards [3]. Over the past few years, several MLI topologies such as diode clamped converter (DCC) [4], flying capacitor converter (FCC) [5], active neutral-point clamped (ANPC) [6], cascaded H-bridge (CHB) [7], modular multilevel converter (MMC) [8], nested neutral-pointed clamped (NNPC) [9], T-type NNPC (TNNPC) [10], and hybrid multilevel converters (HMC) [11] are developed for high-power applications. Some of these topologies require dc-bus voltage and flying capacitor voltage balancing along with output current regulation to generate the high-quality voltage and current waveforms at the converter output terminals.