Journal ArticleDOI
Variable Frequency Transformer—Concept and Electromagnetic Design Evaluation
A. Merkhouf,P. Doyon,S. Upadhyay +2 more
TLDR
In this paper, the basic concept of variable frequency transformer (VFT) is described and an overview of the mechanical and electromagnetic design of a unit having four poles and rated at 100 MW, 17 kV/17 kV, 60 Hz.Abstract:
Variable frequency transformer (VFT) is a controllable bidirectional transmission device that can transfer power between asynchronous networks. The construction of VFT is similar to conventional asynchronous machines, where the two separate electrical networks are connected to the stator and rotor respectively. Electrical power is exchanged between the two networks by magnetic coupling through the air gap of the VFT. This paper describes the basic concept of the VFT and presents an overview of the mechanical and electromagnetic design of a unit having four poles and rated at 100 MW, 17 kV/17 kV, 60 Hz.read more
Citations
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Journal ArticleDOI
Grid integrated renewable DG systems: A review of power quality challenges and state-of-the-art mitigation techniques
Mohit Bajaj,Amit Kumar Singh +1 more
Journal ArticleDOI
Reduction of Power Fluctuations of a Large-Scale Grid-Connected Offshore Wind Farm Using a Variable Frequency Transformer
Li Wang,Long-Yi Chen +1 more
TL;DR: In this paper, a variable frequency transformer (VFT) of 100 MW was used to reduce power fluctuations of an equivalent 80-MW aggregated doubly-fed induction generator (DFIG)-based offshore wind farm (OWF) connected to an onshore 120-kV utility grid.
Journal ArticleDOI
A Comprehensive Review of Power Flow Controllers in Interconnected Power System Networks
TL;DR: A comprehensive review of HVDC interconnections, asynchronous AC interConnections, synchronous AC Interconnections and different types of power flow controllers used in these interconnection technologies is presented.
Journal ArticleDOI
Application of Transformer-Less UPFC for Interconnecting Two Synchronous AC Grids With Large Phase Difference
TL;DR: In this paper, an innovative transformer-less unified power flow controller (UPFC) for interconnecting two synchronous ac grids with large phase difference is presented, which is based on two cascaded multilevel inverters.
Journal ArticleDOI
A Hierarchical Control Strategy With Fault Ride-Through Capability for Variable Frequency Transformer
TL;DR: In this paper, a variable frequency transformer (VFT) is proposed as a new alternative to the classical back-to-back high voltage direct current (HVDC) link for interconnection of two asynchronous networks.
References
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Proceedings ArticleDOI
Variable frequency transformer - a new alternative for asynchronous power transfer
TL;DR: The variable frequency transformer (VFT) as mentioned in this paper is a controllable, bi-directional transmission device that can transfer power between asynchronous networks, similar to a back-to-back HVDC converter.
Journal ArticleDOI
A method for circuit connections in time-dependent eddy current problems
TL;DR: In this article, the authors considered eddy current diffusion problems in which the electromagnetic field is computed in 2D but external circuit connections, between the conductors with eddy currents are taken into account.
Journal ArticleDOI
Use of a permeance model to predict force harmonic components and damper winding effects in salient-pole synchronous machines
TL;DR: In this article, a combined finite-element and analytical modeling technique for the prediction of force-density harmonics in salient-pole synchronous machines is presented, where the model calculates the induced currents in the damper winding cage and includes their effect on force density components in the solution.
Proceedings ArticleDOI
A classical approach to constructing a power flow controller
TL;DR: In this article, a rotary transformer is used in place of a tap changer in a conventional phase-shifting transformer design to realize continuous control of power flow in AC power lines.
Proceedings ArticleDOI
Generator end windings forces and natural frequency analysis
TL;DR: In this paper, a quasi-3D electromagnetic model, which computes the forces on the conductor bars, is coupled with 3D mechanical model to calculate the displacements using the computed electromagnetic forces.
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Reduction of Power Fluctuations of a Large-Scale Grid-Connected Offshore Wind Farm Using a Variable Frequency Transformer
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