Current Controlled PWM for Multilevel Voltage-Source Inverters with Variable and Constant Switching Frequency Regulation Techniques: A Review

Abstract

Due to advancements in power electronics and inverter topologies, the current controlled multilevel voltage-source pulse width modulated (PWM) inverter is usually preferred for accurate control, quick response and high dynamic performance. A multilevel topology approach is found to be best suited for overcoming many problems arising from the use of high power converters. This paper presents a comprehensive review and comparative study of several current control (CC) techniques for multilevel inverters with a special emphasis on various approaches of the hysteresis current controller. Since the hysteresis CC technique poses a problem of variable switching frequency, a ramp-comparator controller and a predictive controller to attain constant switching frequency are described along with its quantitative comparison. Furthermore, various methods have been reviewed to achieve hysteresis current control PWM with constant switching frequency operation. This paper complies various guidelines to choose a particular method suitable for application at a given power level, switching frequency and dynamic response.

Investigated Analysis and New Zero-Sequence Harmonic Injection Pulsewidth Scheme for Overmodulation Region

“…Tackling these harmonics by elevating the switching frequency is limited by the switching losses [11], [12]. Multilevel VSIs are popular in the field [13], [14]. They offer a closer to reference output voltage shape, resulting in lower voltage total harmonic distortion (THD V ) and current ripple.…”

Modeling and control of a cascaded multilevel converter‐based electronic power transformer

“…In all the above works, the EPT high voltage side converters are based on the conventional three‐phase converter. Although it is known that multilevel converters are considered one of the preferred choices of electronic power conversion for high‐power applications , and much work has been done on the multilevel converter based EPT , to the best of our knowledge, few investigators have explored the low voltage ride‐through and unbalance load current management aspects of multilevel converter based EPTs.…”