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The simulation of current source modular multilevel converter (CSMMC) based systems with large number of submodules require significant computational efforts. In this paper, a simplified model of CSMMC is developed to reduce the computational complexity while maintaining the accuracy of the traditional detailed model. The model is constituted using controlled current sources in each arm of the converter...
New semiconductor technologies, like SiC, are being integrated into electric vehicles (EVs). These semiconductors reduce losses to improve the driving range of EVs, and higher switching frequencies minimize harmonic losses. This work presents a framework to quickly assess different topologies and semiconductor technologies where both two- and three-level converters are scrutinized.
This paper presents a new three-port ac-dc converter topology based on the bidirectional version of the three-state switching cell (3SSC) and neutral point clamped (NPC) with Dual Active Bridge (DAB) feasible to interconnect an AC link, a DC link and photovoltaic panels. The three port converter operates as solid state transformer (SST). It the primary side switches voltage and current stresses are...
The most stressful operation point for the inverter of an electric vehicle drive is at low speed. In this operation point, one power semiconductor is mainly stressed because of a high loss concentration. The possibilities of distributing the losses among the power semiconductors through a new modulation is studied for the three-level NPC and the T-Type inverter. The effect of the proposed modulation...
A continuous-time ΔΣ ADC with a new high-linearity Gm-cell is presented. A loop filter employing a Gm-C filter is preferable to an active-RC filter with op-amps for low power consumption and a large phase margin. However, distortion caused by the Gm-cell degrades the ADC performance. A cascoded flipped voltage follower Gm-cell is proposed in order to address this problem. Simulation results reveal...
This article presents the analysis of two topologies of power converters. Voltage Source Inverter (VSI) and Current Source Inverter (CSI) proposals for traction system applications, these topologies are implemented with silicon carbide devices. The use of SiC semiconductors allow working at high switching frequency (100KHz), increase the working temperature range and and decreasing power losses during...
In this paper, a comparison of the energy storage requirements is performed for the modular multilevel converter (MMC) with half-bridge and full-bridge submodules as well as for the alternate arm converter (AAC). Concerning the AAC, the operational mode with overlap period is taken into account and an analytical relation between the overlap angle and the modulation index is presented. This ensures...
In this time, Multilevel Inverter (MLI) innovations turn into an unimaginably primary decision in high power medium voltage energy control range. Despite the fact that multilevel inverter has various advantages but since of utilizing more number of semiconductor switches, it has disadvantages in the vein of high level, extensive size and high cost. To defeat this issue another multilevel inverter...
Transformer-less PV inverters are gaining widespread applications with lower cost, reduced footprint, and improved efficiency. This paper proposes a topology that can eliminate the common mode leakage current which is a major challenge in transformer-less PV inverters. In addition, an active power decoupling strategy is implemented in this topology instead of using large energy storage element for...
In recent years, permanent magnet (PM) vernier machines have gained more and more attentions due to their high torque density and simple mechanical structure. However, vernier PM machines with lap windings always suffer from long end winding length, and regular non-overlapping winding may result in torque reduction for PM vernier (PMV) machines. In this paper, an advanced PM vernier (APMV) machine...
This paper presents comprehensive analysis of a single-stage, isolated, high-frequency ac link based dc-ac converter suitable for PV microinverter applications controlled using phase modulation of the cycloconverter devices (secondary side modulation). A flyback-based regenerative clamp circuit is used for mitigating voltage-spikes on the secondary devices arising due to leakage inductance induced...
In this paper, an isolated bidirectional converter is proposed for transportation applications such as midsize electrified airplanes. Using time-domain analysis a modulation scheme is suggested that allows the converter to transfer any power level up to the nominal value over the entire wide dc range of terminal voltages. A single robust and low cost passive auxiliary is introduced to guarantee zero...
Multi-level converters are widely employed in medium voltage grid-connected PV systems, since they feature better power quality and higher conversion efficiency compared with two-level converters. The conventional two-stage PV converter configuration with additional high step-up elements can satisfy the wide input voltage requirements, but results in reduced conversion efficiency and increased cost...
The current source inverter (CSI) has some application restrictions, especially for the power efficiency problem. The H7 current source inverter is a promising topology since it provides a shunt-connected switching path and significantly reduce the power dissipation. This paper reviews the already published H7 CSI configuration character with its modulation strategy in theory and proposes an optimal...
Based on the flux modulation principle, this paper proposes a novel brushless dual-electrical port dual mechanical port (DEDM) machine. From the view of derived torque equations, the proposed topology can be regarded as a combination of a motor/generator with a brushless magnetic continuously variable transmission. First, the structure and operation principle of the proposed machine are introduced...
The Five-Level Active-Neutral-Point-Clamped (5L-ANPC) inverter is one of the most popular topologies among five-level inverters since it combines the features of Flying-Capacitor (FC) type and Neutral-Point-Clamped (NPC) type inverters and was commercially used for industrial applications. This paper proposes a novel modulation strategy for a Six-Switch 5L-ANPC (6S-5L-ANPC) topology to keep voltages...
This paper presents a novel configuration of three-phase multilevel diode-clamped inverter (DCI) with reduced part count. In the proposed topology, three-phase multilevel output voltage is generated by employing only two inverter phase legs and the third phase is sharing the unused switches of these two legs depending on the line current flow direction. The structure allows synthesizing multilevel...
The Modular Multilevel Inverter (MMI) is a new solution for medium and high voltage, and high power applications. It consists of certain modules, each being a half-bridge parallel to a capacitor. The special characteristic of Modular Multilevel Inverter is its ability to build near sinusoidal voltage waveform by adding several modules in each phase-leg of the inverter. At the beginning, basic concept...
The neutral point (NP) potential self-balancing of five-level full bridge inverters with conventional modulation strategy is related to the modulation index. Both the voltages of two split-capacitors should be sampled and controlled, when the inverter operates with the low modulation index. Therefore, an improved modulation strategy is proposed to realize the NP potential self-balancing for five-level...
This paper investigates different compensation methods for neutral point potential deviation based on modular multilevel single star neutral point clamped bridge converter. Theoretical analysis indicates injecting an offset for a cell can effectively decrease this deviation, so this research presents different offset-based compensation techniques, and evaluates their output performance. Besides, this...
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