Three-Level TAIPEI Rectifier—Analysis of Operation, Design Considerations, and Performance Evaluation

A two switch three-phase power factor correction SEPIC converter with coupled inductor operating in discontinuous current mode is presented. The switches voltage stress in this converter is related to peak of phase voltage instead of line voltage. Also, applying coupled inductor technique, not only reduces number of the magnetic cores but also with suitable design of coupling coefficient, input current ripple cancellation is achieved, so smaller inductor size can be used as input inductance. Thus, the proposed converter only applies three magnetic cores and <5% THD is achieved with the proposed converter in a wide range of load and input voltage variations. Input phases are decoupled so converter can keep unity power factor even under unbalanced input source. Operating modes of the proposed converter is explained, and its input impedance is determined. It is verified that input impedance is pure resistive. The mathematical analysis and design procedure are discussed. Design example and experimental results from 400 W prototype with 220 V line to natural input RMS phase voltage and with 400 V output voltage operating at 40 kHz are presented to verify theoretical analysis.

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“…The switch voltage stress of the proposed converter is lower than [6, 7, 10]. In [11, 12], voltage stress is reduced by using four switches.…”

Section: Comparisonmentioning

confidence: 99%

“…However, the input current THD is high and switch voltage stress is >1000 V to achieve ∼10% THD for phase voltage of 220 V RMS. In [11, 12], the structure of [10] is improved in the case of voltage stress by using four switches. However, conduction losses have increased.…”

Section: Introductionmentioning

confidence: 99%

Unity power factor three‐phase AC–DC converter applying two switch DCM SEPIC converter with coupled inductors

Foroozeshfar

Adib

2018

IET Power Electronics

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“…• Single-stage AC-DC converters with a diode bridge at the input stage [23], [24]: In these types of converters, the diode bridge has high conduction losses; thus, their application is limited to low power applications.…”

Section: Introductionmentioning

confidence: 99%

PMSG-Based Wind Energy Conversion Systems Integration Into DC Microgrids With a Novel Compact Converter

2020

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DC microgrids (DC-MGs) are recognized as an efficient alternative for common AC-MGs. DC-MGs need fewer power electronic converters since most of distributed generation (DG) units and electronic loads operate with DC voltage. The integration of DGs that generate AC voltage, such as wind energy conversion systems (WECSs) into DC-MGs, however, requires an AC-DC conversion unit to perform AC-DC conversion and galvanic isolation and to control the WECS. Typically, two separate cascaded converters are used to perform such functions, which increases the cost and size of DC-MGs. In this paper, an isolated single-stage AC-DC converter is proposed that is able to perform all the required function of a WECS AC-DC conversion unit, to overcome the drawbacks of the two-converter structure. First, the operation of the proposed converter and its features as a single unit are described. The operation of the WECS with the proposed converter is then studied. A design procedure for both the steady-state and dynamic operation of the converter is developed based on a mathematical model. Experimental results obtained from a scaled-down prototype converter are also presented to confirm the feasibility of the proposed converter as a single unit. The complete WECS operation is verified by the simulation results of the aerodynamic, mechanical, and electrical system models, using MATLAB/SIMULINK.

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“…In this converter, a higher voltage is applied to inductors in the discharging mode and input inductors are discharged faster resulting in lower input current THD. To reduce the power switches voltage stress, the three‐level boost converter is employed, which applies four switches [16, 17]. A magnetic switch is applied for boost converter to reduce input THD even when the output voltage is low as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Three‐phase ripple free DCM boost converter with low THD

Foroozeshfar¹,

Adib²

2019

IET Power Electronics

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High total harmonic distortion (THD) and ripple of input current are the two main disadvantages of a single switch discontinuous current mode boost power factor correction (PFC) converter. In this study, THD and input current ripple of conventional DCM boost converter are improved. Reduction of input current THD is achieved by reducing the discharge time of input inductors using magnetic switch concept. Input inductors currents are discharged with a voltage equal to twice of output voltage instead of the output voltage. Also, high input current ripple in discontinuous conduction mode (DCM) operation is solved by using an additional input inductor-capacitor (LC) filter in the conventional converter. This will result in extra weight and volume of the converter. To eliminate the required additional inductors for implementation of the mentioned input LC filter, a ripple cancellation cell using coupled inductors is used and by adjusting mutual inductance in a proper manner, very low input current ripple is achieved. Results from a 400 W prototype converter are presented. Input current THD is below 8% for a wide range of input voltage. Furthermore, the efficiency of the proposed converter is compared with conventional DCM boost PFC converter under the same input current THD. Although the proposed converter applies two switches, the total switching and conduction losses are reduced considerably.

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Three-Level TAIPEI Rectifier—Analysis of Operation, Design Considerations, and Performance Evaluation

Cited by 10 publications

References 21 publications

Unity power factor three‐phase AC–DC converter applying two switch DCM SEPIC converter with coupled inductors

Unity power factor three‐phase AC–DC converter applying two switch DCM SEPIC converter with coupled inductors

PMSG-Based Wind Energy Conversion Systems Integration Into DC Microgrids With a Novel Compact Converter

Three‐phase ripple free DCM boost converter with low THD

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