Series Active Filter Design Based on Asymmetric Hybrid Modular Multilevel Converter for Traction System

Abstract

This paper presents a comparative analysis of a new topology based on an asymmetric hybrid modular multilevel converter (AHMMC) with recently proposed multilevel converter topologies. The analysis is based on various parameters for medium voltage-high power electric traction system. Among recently proposed topologies, few converters have been analysed through simulation results. In addition, the study investigates AHMMC converter which is a cascade arrangement of H-bridge with five-level cascaded converter module (FCCM) in more detail. The key features of the proposed AHMMC includes: reduced switch losses by minimizing the switching frequency as well as the components count, and improved power factor with minimum harmonic distortion. Extensive simulation results and low voltage laboratory prototype validates the working principle of the proposed converter topology. Furthermore, the paper concludes with the comparison factors evaluation of the discussed converter topologies for medium voltage traction applications.

A Novel Control Approach to Hybrid Multilevel Inverter for High-Power Applications

“…The simulation THD is comparatively lowered than that of experimental THD because of the losses and noise. The proposed HMLI topology is compared with existing topologies such as NPC [1], HNPC with H-bridge [2], HNPC with cascaded module [3] in terms of current THD operating at different power ratings (25%, 50%, 100%). The existing topologies, NPC, HNPC with H-bridge, HNPC with cascaded module, and proposed HMLI topology at a 25% power rating have current THD of 6.59, 6.71, 5.31, and 6.55, respectively.…”

“…Similarly, at 50% power rating have current THD of 2.83, 3.43, 3.39, and 3.31, respectively, likewise, at 100% power rating current THD of 1.38, 1.73, 1.71, and 1.66 are achieved, respectively. The proposed HMLI topology is compared with NPC-VSC [1] in terms of efficiency operating at different power ratings (25%, 50%, and 100%). The proposed HMLI topology has 98.2% efficiency when operating at a 25% power rating.…”

“…Over recent decades, multilevel converters (MLCs) have found popular in high-power applications. The reasons for their widespread acceptance are the capability to share the high-voltage stresses among the devices, low conduction and switching losses, and improved power quality with minimum harmonic distortion [1,2]. An attempt to enhance the power quality to IEEE standards, i.e., 5% current total harmonic distortion (THD), necessitates the generation of higher output voltage levels of the converter.…”

Applications of Power Electronics

“…In [33], 3D finite element analysis (FEA) is used to analyze the profile effect of various magnet shapes in axial flux PM motors to obtain higher efficiency. Finally, a series active filter design based on a hybrid modular multi-level converter (MMC) suitable for traction systems is introduced and analyzed in [34].…”

AC Mains Synchronization Loop for Precalculated- Based PFC Converters Using the Output Voltage Measure

“…Ideally, PFC allows the converter to behave as a resistive emulator. In this way, the harmonic content of the input current is almost removed [1][2][3][4].…”