Analysis of a High-Power, Resonant DC–DC Converter for DC Wind Turbines

Dincan, Catalin Gabriel; Kjær, P.C.; Chen, Yu-hsing; Munk‐Nielsen, Stig; Bak, Claus Leth

doi:10.1109/tpel.2017.2770322

Cited by 33 publications

(29 citation statements)

References 24 publications

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“…The main reasons are as follows. In addition, voltage stress of S 2 and S 3 in Figure 4 is 3U in /2, ie, 75 V, while it is less than 3U in /2 in Figure 8 from (11), ie, 59 V. Thus, S 2 and S 3 with lower voltage stress can be selected in Figure 8, which have lower R DS(on) . The resonance of S 2 is mainly caused by the ringing between leakage inductor of the transformer and intrinsic capacitor of switches.…”

Section: Resultsmentioning

confidence: 96%

“…The main reasons of the difference between the converters in Figures 4 and 8 are as follows. As clamped diodes D 5 and D 6 (Schottky diode MBR1660 with forward voltage of 0.65 V) in diode-clamped three-level cells are substituted by MOSFETs S 5 and S 6 (FDP032N08 with R DS(on) of 2.5 mΩ), respectively, conduction loss of converter in Figure 8 is Figure 4 is 3U in /2, ie, 75 V, while it is less than 3U in /2 in Figure 8 from (11), ie, 59 V. Thus, S 2 and S 3 with lower voltage stress can be selected in Figure 8, which have lower R DS(on) . For example, FDP2614 with U DSS of 200 V and R DS(on) of 22.9 mΩ is chosen as S 2 and S 3 in Figure 4, while FDP075N15A with U DSS of 150 V and R DS(on) of 6.25 mΩ is selected as S 2 and S 3 in Figure 8.…”

Section: Resultsmentioning

confidence: 99%

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MOSFET‐clamped three‐level converters without flying capacitor

Yao

Zhang

2019

Int Trans Electr Energ Syst

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Summary Output voltage of renewable energy resources varies widely when environment and load change widely. Therefore, diode‐clamped three‐level isolated DC‐DC converters are adopted to operate in wide input‐voltage range application. However, the conduction loss of the diodes at three‐level units is high in high power or low input‐voltage application. Moreover, the flying capacitor should be used to achieve voltage balance for switches. In order to solve the abovementioned problems, MOSFET‐clamped three‐level DC‐DC converters without flying capacitor are proposed. Diodes in three‐level units are substituted by MOSFETs; thus, the conduction loss is reduced. Moreover, one extra control degree of freedom exists in three‐level units based on MOSFETs, so the flying capacitor can be removed. Derivation of the MOSFET‐clamped push‐pull forward three‐level converter is illustrated. Operating principle is illustrated. Design guidelines and example are given. Simulation and experimental results of the MOSFET‐clamped push‐pull forward three‐level converter without flying capacitor confirm the theoretical analysis. Finally, topology extension of MOSFET‐clamped three‐level converters is given.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

MOSFET‐clamped three‐level converters without flying capacitor

Yao

Zhang

2019

Int Trans Electr Energ Syst

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“…The soft-switching techniques for dc-dc, dc-ac, ac-dc and ac-ac converters are prime objective in minimizing the losses thus to improve the efficiency with reduction in EMI/EMC phenomena. The various soft-switching techniques for semi-conductor switches have been proposed [6][7][8][9][10][11][12][13][14][15]. A novel soft-switching dc-dc converter with significant voltage gain is presented [7].…”

Section: Introductionmentioning

confidence: 99%

“…This converter preserves inherent advantages of current-fed structures, for instance, zero magnetizing dc offset, low input ripple, and low transformer turn ratio. It is also proposed soft-switching dc-dc converter for high-power and high voltage application [11][12]. A typical application in wind energy conversion system is used in offshore series-dc wind farm concept.The researchers [13] are introducing a new method of operation for a series resonant converter, with intended application in megawatt high-voltage dc wind turbines.…”

Section: Introductionmentioning

confidence: 99%

Minimization of Input Ripple Current for Soft-Switching Buck-Boost Converter

Behera,

Kumar,

Behera

2019

IJEAT

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Among all dc-dc converters, the present trend of utilities is buck-boost converter which is capable enough to operate under on/off control so as to step-up and stepping-down the fixed input voltage by varying its duty-ratio of the switch. This converter possesses hard-switched one that means the switching device operate on non-zero voltage or non-zero current and leads to significant increase in switching loss. This issue leads to use of soft-switching of device. As far as the soft- switching of buck-boost converter is concerned, very few papers appear in literature. But in most of these cases, hardly the attention has been given to look into the aspect of ripple content at the input current level. Higher the ripple content at the input not only affect the electrical equipment (i.,e such as adding core losses to transformer in line thus reduction in efficiency), but also causes electromagnetic interference with nearby telecommunication lines and measuring equipment etc. Though there is an option to include the low-pass filter at input, but that creates a hindrance in providing the oscillation along dc link because of input filter in parallel with secondary components across the switch and load. In this research work, the parallel operation of soft-switching buck-boost converter is proposed by modifying the circuit [15] and the circuit is operated with its optimum level so as to minimize the requirement of components. The components of this converter are properly designed to enable soft-switching for the switch. The simulation of the proposed circuit is carried out by MATLAB (Simulink) to validate performance.

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“…Under the traction applications, the DC/DC converter is tied between two DC voltages with a fixed voltage transfer ratio and the openloop control. Relying on the pulse removal technique, the bulky transformer in the classic SRC can be voided in the proposed SRC#, and thus the compact convert design can be archived [25]. More details of operation principle of SRC# is addressed Section 2.…”

Section: Introductionmentioning

confidence: 99%

Harmonic Susceptibility Study of DC Collection Network Based on Frequency Scan and Discrete Time-Domain Modelling Approach

Imbaquingo

Sarrá

Isernia

et al. 2018

Journal of Electrical and Computer Engineering

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The equivalent model of offshore DC power collection network for the harmonic susceptibility study is proposed based on the discrete time-domain modelling technique and frequency scan approach in the frequency domain. The proposed methodology for modelling a power converter and a DC collection system in the frequency domain can satisfy harmonic studies of any configuration of wind farm network and thereby find suitable design of power components and array network. The methodology is intended to allow studies on any configuration of the wind power collection, regardless of choice of converter topology, array cable configuration, and control design. To facilitate harmonic susceptibility study, modelling DC collection network includes creating the harmonic model of the DC turbine converter and modelling the array network. The current harmonics within the DC collection network are obtained in the frequency domain to identify the resonance frequency of the array network and potential voltage amplification issues, where the harmonic model of the turbine converter is verified by the comparison of the converter switching model in the PLECS™ circuit simulation tool and laboratory test bench, and show a good agreement.

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Analysis of a High-Power, Resonant DC–DC Converter for DC Wind Turbines

Cited by 33 publications

References 24 publications

MOSFET‐clamped three‐level converters without flying capacitor

MOSFET‐clamped three‐level converters without flying capacitor

Minimization of Input Ripple Current for Soft-Switching Buck-Boost Converter

Harmonic Susceptibility Study of DC Collection Network Based on Frequency Scan and Discrete Time-Domain Modelling Approach

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