A DC link-modulated three-phase converter

Raju, N.R.

doi:10.1109/ias.2001.955928

Cited by 8 publications

(10 citation statements)

References 6 publications

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“…The concept of quasi-stationary dc-link voltage adjustment was studied with monolithic dc/dc stages, reflecting the topology of Toyota's hybrid synergy drive and other in-production vehicles [54]. A modulation of the dc voltage can substantially reduce the switching loss in the subsequent drive inverter [7], [25], [54], [55], [80], [81].…”

Section: Relation To Previous Dc-link Modulation Methodsmentioning

confidence: 99%

“…In equivalent terms, no zero-voltage vectors are required. The frontend inverter therefore spares 2 /3 of switching compared to conventional space-vector pulse-width modulation (SVPWM), or 1 /2 compared to discontinuous pulse-width modulation (DPWM) and still without the distortion issues of DPWM [25], [54], [55]. The spared switching duty is relegated to the adaptive dc battery backend, but the latter incurs much less switching loss due to the fractionized switching voltage and the use of fieldeffect transistors (FETs) and can generate higher output quality due to a higher number of output levels.…”

Section: A Adaptive DC Battery Through Circuit Reconfigurationmentioning

confidence: 99%

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A Rapidly Reconfigurable DC Battery for Increasing Flexibility and Efficiency of Electric Vehicle Drive Trains

Li¹,

Yang²,

Gerry³

et al. 2024

IEEE Trans. Transp. Electrific.

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This paper proposes a drive train topology with a dynamically reconfigurable dc battery, which breaks hard-wired batteries into smaller subunits. It can rapidly control the output voltage and even contribute to voltage shaping of the inverter. Based upon the rapid development of low-voltage transistors and modular circuit topologies in the recent years, the proposed technology uses recent 48 V power electronics to achieve higher-voltage output and reduce losses in electric vehicle (EV) drive trains. The fast switching capability and low loss of low-voltage field effect transistors (FET) allow sharing the modulation with the main drive inverter. As such, the slower insulated-gate bipolar transistors (IGBT) of the inverter can operate at ideal duty cycle and aggressively reduced switching, while the adaptive dc battery provides an adjustable voltage and all common-mode contributions at the dc link with lower loss. Up to 2 /3 of the switching of the main inverter is avoided. At high drive speeds and thus large modulation indices, the proposed converter halves the total loss compared to using the inverter alone; at lower speeds and thus smaller modulation indices, the advantage is even more prominent because of the dynamically lowered dc-link voltage. Furthermore, it can substantially reduce the distortion, particularly at lower modulation indices, e.g., down to 1 /2 compared to conventional space-vector modulation and even 1 /3 for discontinuous pulse-width modulation with hardwired battery. Other benefits include alleviated insulation stress for motor windings, active battery balancing, and eliminating the vulnerability of large hard-wired battery packs to weak cells. We demonstrate the proposed motor drive on a 3-kW setup with eight battery modules.

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Section: Relation To Previous Dc-link Modulation Methodsmentioning

confidence: 99%

Section: A Adaptive DC Battery Through Circuit Reconfigurationmentioning

confidence: 99%

A Rapidly Reconfigurable DC Battery for Increasing Flexibility and Efficiency of Electric Vehicle Drive Trains

Li¹,

Yang²,

Gerry³

et al. 2024

IEEE Trans. Transp. Electrific.

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“…Multiple hardware solutions can be imagined to take advantage of the idea to use series active filters to correct the residual harmonic voltages. In [6], a solution to use an Hbridge inverter in the DC-link to compensate the magnitude ripple caused by removing the zero states from the SVM pattern was proposed. The series connected H-bridge inverter in the DC-link was also used in conjunction with a 2-stage matrix converter to increase the voltage transfer ratio and improve the robustness to supply unbalance [7]- [8].…”

Section: Analysing the Waveform Profile Of The Single Leg Switchmentioning

confidence: 99%

Hybrid inverter arrangements to facilitate reduced switching losses of the main inverter

Klumpner

Zargar

2016

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society

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Abstract-This paper investigates two hybrid inverter topologies consisting of a slow switching DC/AC main voltage source inverter and output series connected low-voltage rated, fast switching auxiliary inverters that may be suitable for medium and high voltage AC grids. Two topologies of auxiliary inverters are investigated: the use of AC choppers implemented with bidirectional switches as well as using the more traditional H-bridge inverter. A modified modulation scheme for the main inverter enables the elimination of the zero voltage vectors which allows the use of only two switchings per switching period which may reduce significantly the associated switching losses. As the result is a quasi-trapezoidal output phase voltage, the auxiliary inverters are controlled to remove the differential mode distortion. Simulation results prove that the proposed hybrid grid interface is able to provide low harmonic voltage content.

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“…In addition two other advantages arise [4]- [6]: because the buck stage enables full control over the voltage delivered to the VSI, it is possible to continuously adjust the average over a cycle dc-link voltage seen by the inversion stage that enables the elimination of zero-voltage switching states in the inversion stage due to a combined PWM-PAM and therefore, halving the number of hard switchings. Furthermore, because the switching pattern of the buck and inverter stages are synchronized, always except when Idc<0, one switching of the VSI will be a ZVS and therefore a further reduction of the switching losses is possible.…”

Section: Introductionmentioning

confidence: 99%

A New Two-Stage Voltage Source Inverter with Modulated DC-link Voltage and Reduced Switching Losses

Klumpner

2006

IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk A New Two-Stage Voltage Source Inverter with Modulated DC-link Voltage and Reduced Switching Losses

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A DC link-modulated three-phase converter

Cited by 8 publications

References 6 publications

A Rapidly Reconfigurable DC Battery for Increasing Flexibility and Efficiency of Electric Vehicle Drive Trains

A Rapidly Reconfigurable DC Battery for Increasing Flexibility and Efficiency of Electric Vehicle Drive Trains

Hybrid inverter arrangements to facilitate reduced switching losses of the main inverter

A New Two-Stage Voltage Source Inverter with Modulated DC-link Voltage and Reduced Switching Losses

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