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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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Journal ArticleDOI
TL;DR: A multiple-vector MPPC scheme is proposed that can minimize active power and reactive power ripples and achieve capacitor voltage balancing with a constant switching frequency and demonstrates the superiority of the proposed control scheme over the C-MPPC.
Abstract: Model-predictive power control (MPPC) takes the switching nonlinearity of power converters and system constraints into consideration. It is a promising control technique for three-phase four-switch rectifiers (TPFSRs) because capacitor-voltage-balancing control and instantaneous power control can be simultaneously designed for this type of power converters. However, since only one switching vector is allowed in each control interval, conventional MPPC (C-MPPC) may lead to significant output power ripples that can severely degrade system power quality. This is particularly true for TPFSRs due to the limited number of switching states as well as the constraint imposed by the capacitor-voltage-balancing control. To improve the performance of TPFSRs, this paper proposes a multiple-vector MPPC scheme, which can minimize active power and reactive power ripples and achieve capacitor voltage balancing with a constant switching frequency. An equivalent zero-voltage vector model and a capacitor-voltage-balancing model are derived to implement the proposed control scheme. Comparative experimental results are presented to demonstrate the superiority of the proposed control scheme over the C-MPPC.

57 citations

Journal ArticleDOI
TL;DR: In this article, a multiresonant rectifier with a single transistor is introduced, which is capable of drawing a higher quality input-current waveform at nearly unity power factor and lower stresses than quasi-resonant Rectifiers.
Abstract: A new family of single-switch three-phase high-power-factor rectifiers, which have continuous input and output currents, is introduced. By using a multiresonant scheme, the transistor operates with zero-current switching (ZCS), and the diodes operate with zero-voltage switching (ZVS). These multiresonant rectifiers with a single transistor are capable of drawing a higher quality input-current waveform at nearly unity power factor and lower stresses than quasi-resonant rectifiers. Buck-type converters are used for the power stage, and, hence, the output voltage is lower than the input voltage. Moreover, these rectifiers have a wide load range and low stresses on semiconductor devices. From the analysis, normalized characteristics of the rectifier are derived. The design and breadboard implementation of the rectifier delivering 147 V/sub dc/ at 6 kW from a 3/spl phi/ 240-V/sub rms(LL)/ input is described. The total harmonic distortion (THD) of the line current is less than 5%, and the system efficiency is about 94% at the full load.

57 citations

Journal ArticleDOI
TL;DR: In this paper, a modified two-level three-phase inverter for the reduction of the leakage current is presented, where two active dc-decoupling devices and a voltage-clamping network have been added.
Abstract: This paper presents a modified two-level three-phase inverter for the reduction of the leakage current. With respect to a traditional two-level inverter, the proposed solution reduces the common-mode voltage (CMV), both in amplitude and frequency. Between the dc source and the traditional three-phase bridge, two active dc-decoupling devices and a voltage-clamping network have been added. A dedicated control strategy was developed adopting a modified space vector pulse-width modulation, oriented to the reduction of the CMV. Simulations showing the good performance of the solution are presented. A preliminary prototype was developed and experimental results are presented.

57 citations

Patent
29 Sep 1982
TL;DR: In this paper, a vector rotator is used to form the angle between the vectors, which angle can be controlled to zero by a phase controller acting on the frequency control input of the final control element.
Abstract: In order to synchronise a final control element (an invertor (2) supplied, for example, from a solar generator (1) or an externally driven synchronous machine) to a network (11) to be supplied, both the magnitudes (¦Uw¦, ¦Un¦) and the directions of the corresponding voltage vectors are determined by means of coordinate converters (21, 31) and vector analysers (22, 32) from the final control element output voltage (Uw) and the network voltage (Un). The difference (¦Un¦-¦Uw¦) of the magnitudes is supplied via a magnitude controller (30) to the amplitude control input (3) of the final control element. A vector rotator (25) forms the angle between the vectors, which angle can be controlled to zero by a phase controller (33) acting on the frequency control input (4) of the final control element (2). In order to keep the final control element in synchronism with the network after closing the synchronising switch (14), and to control the exchange of real power and reactive power at the fundamental frequency between the mains and the final control element, the real component and the reactive component are determined from the measured current value (Iw) by means of a coordinate converter (41) and a vector rotator (42) and are each supplied to a controller (43, 44). The output signal of the real current controller is also connected to the phase controller input, and the output signal of the reactive power controller (43) is additionally connected to the magnitude controller input. This results in a universal apparatus which facilitates both network synchronisation and maintenance of a network-synchronous parallel operation of the final control element, while also facilitating the transition to an externally synchronised supply into a passive consumer network (isolated operation).

57 citations

Proceedings ArticleDOI
18 Mar 2010
TL;DR: In this paper, a new circuit topology is proposed to meet the input harmonic current standard for an ac machine drive system which has a very small dc-link capacitor, and it keeps up size and cost competitiveness.
Abstract: This paper presents a new circuit topology to meet the input harmonic current standard for an ac machine drive system which has a very small dc-link capacitor. The proposed circuit topology is based on a harmonic current injection method, and it keeps up size and cost competitiveness of an ac machine drive system having a very small dc-link capacitor. Also, this paper proposes an appropriate control algorithm and a stability analysis for the proposed circuit topology. Experimental results reveal the validity of the proposed circuit topology and its control method. Also, it is confirmed that the harmonic current standard can be satisfied with the proposed circuit and its control method.

56 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