Topic
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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23 Jun 2013TL;DR: In this article, the authors present a review of three-phase impedance measurement methods, with an emphasis on practical issues such as instruments required, form and level of injection, background harmonics, and measurement noise.
Abstract: The purpose of this work is to review three-phase impedance measurement methods, with an emphasis on practical issues such as instruments required, form and level of injection, background harmonics, and measurement noise. In general, measuring three-phase impedance requires special frequency response analyzers that are capable of injecting two independent voltage or current signals at a sufficiently high level compared to the operational voltage and current of the system, and measuring three-phase voltages and currents simultaneously. Since such instruments are not commercially available and are difficult to construct in general, this paper discusses measurement techniques using existing commercial frequency response analyzers, power amplifiers and injection transformers. Different methods to inject a voltage perturbation into three-phase circuits are reviewed and applied to determine the small-signal impedance in both positive and negative sequences, with or without coupling. The proposed methods allow to measure sequence impedances over a wide frequency range for stability analysis and control design of three-phase power electronic systems.
45 citations
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TL;DR: In this article, the gains of PI controller in torque and voltage control loop of rotor-side converter (RSC) are optimized by particle swarm optimization (PSO) to improve the dynamic performance of DFIG.
45 citations
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17 Jun 2007TL;DR: In this paper, a three phase DC-DC converter with zero voltage switching (ZVS) with high frequency transformer isolation is proposed, where a single common active clamp branch is used to limit transient voltage across the three-phase full bridge and to realize zerovoltage switching in all switches by using the energy stored in the transformer leakage inductance.
Abstract: In this paper, a new three-phase high power current-fed dc/dc converter with active clamp is proposed. A three phase DC-DC converter with zero voltage switching (ZVS) with high frequency transformer isolation is shown. A single common active clamp branch is used to limit transient voltage across the three-phase full bridge and to realize zero-voltage switching (ZVS) in all switches by using the energy stored in the transformer leakage inductance. The proposed approach has the following advantages : an increase (by a factor of three) of input current and output voltage chopping frequencies; lower rms current through the inverter switches with higher power transfer capability; reduction in size of reactive (filter) components; better transformer utilization. The proposed converter is suitable for higher power fuel cell dc sources with low voltage outputs. The paper details the analysis, simulation and hardware implementation of the proposed system. Finally experimental results obtained on a 500 W prototype demonstrates the feasibility of the proposed scheme.
45 citations
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TL;DR: In this paper, the authors presented two high power factor rectifiers that apply the third harmonic current injection principle and passive resistance emulation, enabling recovery of the power taken by the current injection network.
Abstract: Two high power factor rectifiers that apply the third harmonic current injection principle and passive resistance emulation are presented in this paper. Two methods of current injection, simultaneous current injection in all three of the phases, and current injection to only one of the phases, are discussed. Conditions for the optimal third harmonic current injection are derived, structures of the rectifiers that apply passive resistance emulation, enabling recovery of the power taken by the current injection network, are presented. The proposed resistance emulator consists of a transformer, two diodes and a capacitor. Choice of the passive components is discussed, and their values are proposed, volt-ampere ratings of the magnetic components are derived. Influence of the higher order harmonics is discussed. Dependence of the input current total harmonic distortion on the load level is presented for both of the current injection methods. Analytically obtained results are verified on 1.5 kW experimental rectifiers.
45 citations
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TL;DR: The aim of this paper is to investigate the torque components and the sensorless position detection capability of an IPM dual three-phase machine equipped with two fractional-slot windings, yielding an increase of the fault-tolerant capability of the machine.
Abstract: The interest for fractional-slot permanent-magnet (PM) synchronous machines has been more and more increasing in recent years. Particularly attractive is the interior PM (IPM) machine, since it is characterized by two torque components: the PM torque and the reluctance torque. Owing to this feature, the IPM machine is able to operate under flux-weakening conditions, as required by many applications, such as automotive, machine tools, washing machines, and so on. Another feature is that the rotor position can be detected without sensor even at zero speed, by means of techniques based on high-frequency signal injection. The aim of this paper is to investigate the torque components and the sensorless position detection capability of an IPM dual three-phase machine equipped with two fractional-slot windings. These two windings are designed to be supplied by two separate converters, yielding an increase of the fault-tolerant capability of the machine. The analysis and the tests deal with the capability of the machine when it operates under healthy as well as faulty conditions, i.e., when the supply of one three-phase winding set is switched off and only one winding continues to be supplied.
45 citations