Soft‐switching step‐up/down DC–DC converter with bipolar outputs

Zhou, Xiang; Xu, Jianping; Chen, Xuejian; Zhong, Shaomin

doi:10.1049/el.2016.1520

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…Equation (9) shows that the fundamental component of the pre-filter input current is sinusoidal and in-phase with the supply voltage, this reduces the size and simplifies the design of the ac-side L-C filters.…”

Section: Mode 1 (0mentioning

confidence: 99%

“…The dc voltage is easily provided from ac voltage by using diode or thyristor rectifier; however, this approach leads to injection of significant current harmonics into the ac power supply, and suffers from low power factor. These problems are easily addressed by using self-commutated power converters that employ semiconductor devices with turn on and off capability and can be controlled using high frequency pulse width modulation [6][7][8][9][10][11][12][13]. Significant efforts have been invested into the development of new generations of three-phase ac-dc converters that push the current and voltage harmonics far away from the power frequency range.…”

Section: Introductionmentioning

confidence: 99%

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High-power medium-voltage three-phase ac–dc buck–boost converter for wind energy conversion systems

Alsokhiry

Abdelsalam

Adam

et al. 2019

Electric Power Systems Research

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This paper proposes three topologies of single-stage three-phase ac-dc buck-boost converters suitable for medium-voltage and high-power wind energy conversion systems (WECS). The proposed converters draw sinusoidal input currents with nearly unity power factor from wind generators over wide range of ac voltages and frequencies. The proposed converters reduce the voltage and current stresses on the self-commutated switching device compared to existing solutions; thus, promising for new generation of relatively cheap WECSs. The proposed converters operate in Discontinuous Condition Mode (DCM), with their ac terminals connected to three-phase generator with open ended windings, or to ac supply using three single-phase transformers with isolated windings at converter side. The validity of the proposed converters and its detailed theoretical analysis and discussions are confirmed using PSCAD/EMTDC simulations, and further corroborated by experimentations, considering different operating conditions. Nomenclature δ: Duty cycle. δc: Critical duty cycle ωg: Generator speed ωopt: Optimal speed CCM: Continuous conduction mode DCM: Dissentious conduction modes DBD1 to DBD3 : Sub-converter blocking diodes DFW1 to DFW3 : Sub-converter freewheeling diodes fs : Switching frequency f : Supply fundamental frequency Ic : dc-link capacitor current Ic_avr : Average dc-side capacitor current Ip : Peak fundamental supply current I * p : Reference peak fundamental supply current Ldc1 to Ldc3 : dc-link inductances Ldc_slc :Selected dc-link inductance for given circuit operation ILa, ILb , and ILc : dc-link inductance current ILmax_a, ILmax_b, and ILmax_c : Peak dc inductor currents is1 to is6 : Currents in the switches of the sub-converters ira ,irb ,and irc : Fundamental component of the pre-filter input current ir_rms : Pre-filter input root mean square current MPPT :Maximum power point tracking PI : Proportional integral R : Load resistance txa, txb and txc Deplete times of the energy stored in the dc-link inductors Ts : Switching period Vdc : dc link voltage Vm : Peak of phase voltage vs(a),vs(b), and vs(c) : Three-phase supply voltages WECS : Wind energy conversion system ZCS : Zero current switching

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Section: Mode 1 (0mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-power medium-voltage three-phase ac–dc buck–boost converter for wind energy conversion systems

Alsokhiry

Abdelsalam

Adam

et al. 2019

Electric Power Systems Research

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“…In most of these cases, the circuit employs more number of switches. This paper [6] proposes a zeta and a buck boost converter, resulting in higher switching losses, because of more number of switches. Multiport converters employing renewable energy sources are converters with low cost [7] [8].…”

Section: Introductionmentioning

confidence: 99%

Implementation of a low cost ac-dc converter for high and low power applications

Ilambirai¹,

Dash²,

Rayaguru³

2017

IJET

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This paper proposes an ac-dc converter that gives multiple outputs capable of feeding both high and low power applications. The input ac supply is converted to dc by a diode bridge rectifier, filtered and fed to a modified multiport converter (MPC). This paper focuses on the design of the modified multiport converter that has a cascaded combination of zeta and a buck converter. This is designed as a single input and multiple output converter (SIMO) structure which can operate two loads, one with a high power and other with a low power application, depending on the time instant. The need for opting a multiport converter, reduces the number of switches utilized, thereby reducing the switching losses in the circuit. The zeta in the MPC boosts the input voltage and the buck converter reduces the input voltage and is accordingly fed to the need of the load. The design of the components have been analysed through steady state. MATLAB Simulink has been used to simulate the converter circuit and the varied outputs of the zeta and buck modes are compared. A hardware prototype of the ac-dc converter has been implemented and their results have been shown.

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