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This paper presents a comprehensive harmonic analysis of the interleaved voltage source converters based on different carrier configurations. The impact of carrier configurations on the interleaved three-level (3L) converters is also investigated. The relationship among the harmonics in line-to-line voltage, common mode voltage (CMV), and circulating current is identified for interleaved two-level...
Multilevel inverters have evolved and developed into a mature and successful technology as a result of its high power applications based electronic power conversion capabilities. The aim of this paper is to review various recently developed three phase multilevel inverter topologies with different configurations and control methodologies such that number of components employed is reduced and ultimately...
In this work it is presented a review of the Multilevel Current Source Rectifiers (MCSR), aiming to reduce the number of switches and inductors, thus reducing losses, cost and volume of the converter. Despite the removal of switches and inductors, the control and PWM ensures the correct operating of the converter. Simulations are presented to validate the effective operation of the topology for five-,...
This paper investigates three AC-DC-AC multilevel topologies for three-phase four-wire (3P4W) applications obtained from an interconnection of three-leg voltage source converters (VSCs). The topologies provide bidirectional power flow and can be applied in line voltage regulators, universal active power filters and uninterrupted power supplies (UPS). Operating principles, a pulse-width modulation...
In this paper, a non-inverting buck-boost derived hybrid converter (NIBBDHC) is proposed. It is derived from conventional two switch non-inverting buck-boost converter topology. Here, a parallel switch in conventional two-switch non-inverting buck-boost converter has replaced by a bridge type voltage source converter (VSC). Thus, the proposed converter topology can give both DC and AC outputs simultaneously...
A bidirectional isolated dual-active-bridge (DAB) converter with three-level voltage-doubler rectifier (TL-VDR) is presented for energy storage applications. The voltage conversion ratio is enhanced and the voltage stresses on transformer windings are reduced with the help of TL-VDR. Optimized pulse-width-modulation (PWM) plus dual phase-shift-modulation (PSM) strategy is applied to the presented...
This work introduces a family of Current Source Converters (CSCs) that allows to control single-phase AC converters with two outputs independently sharing the same DC-bus. It is presented four different topologies which have their own advantages and disadvantages compared to each other. The comparison criterias are the total number of switches, the number of conducting switches per switching cycle,...
This paper presents four nine-phase drive systems. A nine-phase machine is connected to four converters in an open-end winding arrangement, with one of the converters being shared by all machine groups. Because of the shared converter, the structures are only applied for machines with α = 0°. A PWM strategy is discussed in order to reduce machine torque ripple. Simulation and experimental results...
In this work it is presented a novel topology of Current Source Converter (CSC) that allows to control multiple single-phase AC converters independently sharing the same DC-bus, with the advantage of having a reduced number of conducting switches, less switching and a lower DC-bus current. A conventional n-output/port single-phase CSC that uses the same DC-bus needs to have n H-bridge converters connected...
Over the last years, the two-level three-phase voltage source converters (VSCs) have received an increasing attention as an alternative to conventional thyristor converters. This is due to the universality of this topology having the full capability to operate as conventional voltage source inverters driving a three-phase AC machine as well as a grid-tied converter ensuring a bidirectional power flow...
For a Voltage Source Converter based High Voltage Direct Current Transmission(VSC-HVDC)system the most important part is the VSC part because it determines main performance of the whole system. This paper proposed a new topology of PWM AC/DC converter which is cascaded VIENNA rectifier. In addition, in this paper a current controller based on the working modes of three-phase VIENNA rectifier will...
A two bi-directional switch based three-phase boost AC voltage regulator is presented in this paper. The operational principle of the proposed three-phase regulator is a direct consequence of using two three-phase bi-directional switches in the boost converter topology. The topology has reduced number of switches for a three-phase AC voltage regulator having output voltage regulation, input current...
An approach for three-phase AC to DC conversion is proposed, which consists of a single-stage while offering galvanic isolation, soft-switching, bi-directional power flow and a significant reduction of inductive and capacitive energy storage. Two elements enable this approach, namely a neutral voltage-lift capacitor and a Quad Active Bridge (QAB) converter. Moreover, a control strategy is described...
In this work it is presented a novel topology of Current Source Converter (CSC) that allows to control two single-phase AC converters independently sharing the same DC-bus, with the advantage of having a reduced number of conducting switches, less switching and a lower DC-bus current. A conventional double single-phase CSC that uses the same DC-bus needs to have two two-legs (H-bridge) converters...
This paper proposes a carrier-based pulse-width modulation (CBPWM) scheme for N independent three-phase loads using the general (3N+3)-switch converter. The proposed topology is derived from the nine-switch converter which is gaining considerable interest from researchers because it costs less due to its reduced number of active switches. The structure and limitations of the converter are elaborated;...
The paper conducted a theoretical analysis and experimental research on the modulation strategy, capacitor voltage control strategy as well as capacitor pre-charge control strategy of modular multilevel converter (MMC). According to the mathematical model of MMC, The combination of CPS-SPWM modulation strategy and capacitor voltage balancing algorithm based on selection of sub-modules is proposed...
Permanent magnet synchronous generator (PMSG) systems are becoming more and more popular in recent years, especially for the variable-speed situations. Various power conversion topologies utilized in the PMSG systems are introduced and implemented with both the finite element analysis software MagneForce and the Matlab/Simulink. System performances and design concerns are analyzed through comparative...
Conventional inverter output has PWM output. This pulsed output waveform reduces insulation life time, contributes to quick degradation of the bearings and also is often source of acoustic noise. Furthermore, losses of PWM inverter-driven motors increase. In this paper a novel topology is proposed which is capable of generating a sinusoidal waveform, with low harmonic distortion. If the proposed method...
A new scheme for a 4-level Static Compensator (STATCOM) integrating two 2-Level converters, supplying / absorbing reactive power to / from the grid is proposed in this paper. Reduced component count and simpler layout of switches are the attractive features of the proposed topology over the existing diode clamped multilevel converter. Furthermore, less number of dc links and smaller dc link capacitor...
VSC-HVDC is the ideal transmission technology for the connection of the wind farms to the power system. In this paper the topology of VSC-HVDC for connection of wind farm was presented. Control strategy of VSC-HVDC for wind farm using DFIG was proposed. DFIG and VSC-HVDC were modeled in PSCAD/EMTDC software and simulation analysis was carried out. Simulation results were presented to illustrate the...
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