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Three-phase

About: Three-phase is a research topic. Over the lifetime, 16801 publications have been published within this topic receiving 159477 citations.


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Patent
31 Jan 2012
TL;DR: In this article, a low input-current harmonic three-phase boost rectifier includes an input stage for receiving a threephase input voltage in relation to a neutral node and an output stage adapted to couple to at least one load.
Abstract: A low input-current harmonic three-phase boost rectifier includes an input stage for receiving a three-phase input voltage in relation to a neutral node and an output stage adapted to couple to at least one load. The rectifier further includes one or more switching converter stages, each having a plurality of switches coupled to the neutral node, the plurality of switches operating with a fixed duty cycle, the fixed duty cycle being a substantially 50% duty cycle. The rectifier further includes one or more controllers adapted to vary the switching frequency of the plurality of switches based on at least one of a condition of the at least one load or the input voltage and includes one or more decoupling stages, each including one or more inductive elements adapted to inductively decouple the output stage from at least one of the one or more switching converter stages.

42 citations

01 Jan 2015
TL;DR: In this article, the authors proposed a series capacitor in series with the interfacing inductor of the shunt active filter to match the dc-link voltage requirements of the series and active filters with a common dc link capacitor.
Abstract: 2 ABSTRACT: This circuit consists of capacitor in series with the interfacing inductor of the shunt active filter. The series capacitor enables reduction in dc-link voltage requirement of the shunt active filter and simultaneously compensating the reactive power required by the load, so as to maintain unity power factor, without compromising its performance. This allows us to match the dc-link voltage requirements of the series and shunt active filters with a common dc link capacitor. Further, in this topology, the system neutral is connected to the negative terminal of the dc bus.. This will avoid the requirement of the fourth leg in VSI of the shunt active filter and enables Independent control of each leg of the shunt VSI with single dc capacitor. The topology uses a capacitor in series with the interfacing inductor of the shunt active filter, and the system neutral is connected to the negative terminal of the dc-link voltage to avoid the requirement of the fourth leg in the voltage source inverter (VSI) of the shunt active filter. The average switching frequency of the switches in the VSI also reduces, consequently the switching losses in the inverters reduce. Detailed design aspects of the series capacitor and VSI parameters have been discussed in the paper. A simulation study of the proposed topology has been carried out using PSCAD simulator, and the results are presented. Experimental studies are carried out on three-phase UPQC prototype to verify the proposed topology.

42 citations

Proceedings ArticleDOI
10 Dec 2002
TL;DR: In this paper, the authors developed a tuning procedure for active rectifiers based on the analysis of the transient behavior and the steady state harmonic content of the DC voltage and of the AC current.
Abstract: Industrial engineers face many nonideal operating conditions in the design of the active rectifiers: too long computation time, presence of acquisition filters, AC phases unbalance, location of the grid voltage sensors after a dominant reactance and passive damping if an LCL-filter is used. The phenomena generated by these conditions are generally nonlinear. Hence the first step is to find out how much each of them affects the system's overall performance. Then new rules for the tuning of the controllers can be developed on the basis of the analysis of the transient behavior and of the steady state harmonic content of the DC voltage and of the AC current. This procedure is developed in this paper through simulations and laboratory tests.

42 citations

Journal ArticleDOI
TL;DR: A novel TPTL dc/dc converter adopting a symmetrical duty cycle control is proposed in this paper, which has fewer switches and simpler configuration and the ripple frequency of output current can be increased significantly, resulting in a reduced filter requirement.
Abstract: Three-phase dc/dc converters have the superior characteristics including lower current rating of switches, the reduced output filter requirement, and effective utilization of transformers. To further reduce the voltage stress on switches, three-phase three-level (TPTL) dc/dc converters have been investigated recently; however, numerous active power switches result in a complicated configuration in the available topologies. Therefore, a novel TPTL dc/dc converter adopting a symmetrical duty cycle control is proposed in this paper. Compared with the available TPTL converters, the proposed converter has fewer switches and simpler configuration. The voltage stress on all switches can be reduced to the half of the input voltage. Meanwhile, the ripple frequency of output current can be increased significantly, resulting in a reduced filter requirement. Experimental results from a 540-660-V input and 48-V/20-A output are presented to verify the theoretical analysis and the performance of the proposed converter.

42 citations

Journal ArticleDOI
TL;DR: In this paper, a three-phase, three-winding 240-MVA converter transformer failure indicated the failure was caused by harmonic fluxes, and it was estimated that at full load the hot spot temperature of the transformer was about 159/spl deg/C.
Abstract: Harmonic frequency leakage flux can be a limiting factor in three-phase, three-winding HVDC converter transformers. Investigation of a three-phase, three-winding 240-MVA converter transformer failure indicated the failure was caused by harmonic fluxes. Calculations indicated that the magnitudes of these harmonic fluxes to be approximately 45% of the power frequency leakage flux for the transformer, and are little affected by the transformer impedance or the converter firing angle. A study of the failed transformer loading during its life was made and a calculation made of the hot spot temperature considering various insulation half-life factors. Based on published information on insulation half-life factors it was estimated that at full load the hot spot temperature of the transformer was about 159/spl deg/C. From examination of the insulation in the hot spot area, this estimate of hot spot temperature was considered reasonable.

42 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023111
2022291
2021475
2020826
20191,037
20181,103