Variable Frequency Transformer—Concept and Electromagnetic Design Evaluation

Merkhouf, Arezki; Doyon, P.; Upadhyay, Saurabh

doi:10.1109/tec.2008.2001460

Cited by 54 publications

(24 citation statements)

References 6 publications

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“…In modeling, the VFT is represented as a doubly-fed WRIM whose rotor is mechanically coupled to the DDM [19,20]. Here, DDM supplies mechanical power 'P d ' to the rotor of the WRIM as shown in Fig.…”

Section: Modeling Of Proposed Methodsmentioning

confidence: 99%

A new synchronous generator based wind energy conversion system feeding an isolated load through variable frequency transformer

Bakhsh

Khatod

2016

Renewable Energy

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a b s t r a c tThis paper aims to explore the possibility of synchronous generator (SG) based wind energy generation system feeding an isolated load using a latest power transmission technology i.e. variable frequency transformer (VFT). The proposed configuration does not employ any power electronics based interface as in conventional SG based stand-alone wind energy conversion systems (SWECS). For analysis, the simulation models of proposed configuration as well as conventional configuration have been developed under MATLAB-Simulink environment. A series of studies on power fed from the SG to the different loads at various SG input speeds has been carried out with the developed models. Further to analyze the effectiveness of the proposed method; the efficiency, total harmonic distortion (THD) of output voltage and THD of output current of the proposed method have been compared with those of the conventional method. From obtained results, it is observed that the proposed method is simple and does not produce harmonics. Moreover to validate the proposed scheme, an experimental analysis has been carried out. Further, the cost analysis of both systems has also been carried out. From the cost analysis, it is observed that the proposed system is cheaper than the conventional system.

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Section: Modeling Of Proposed Methodsmentioning

confidence: 99%

A new synchronous generator based wind energy conversion system feeding an isolated load through variable frequency transformer

Bakhsh

Khatod

2016

Renewable Energy

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“…In order to transfer power from SG to grid, the torque is applied at the rotor of the WRIM by dc drive motor. The power flow through VFT is proportional to the magnitude of the applied torque [13] - [16]. Here, in the power flow process, only active power transfer has being discussed.…”

Section: A Modeling Of Proposed Systemmentioning

confidence: 99%

A novel method for grid integration of synchronous generator based wind energy generation system

Bakhsh

Khatod

2014

2014 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)

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Conventional grid connected synchronous generator (SG) based wind energy generation system (WEGS) incorporates sophisticated power electronic control system in it which produces harmonics and this deteriorates the quality of output power. Hence, this paper presents a new method for grid integration of SG based WEGS using variable frequency transformer (VFT). The proposed method does not employ any power electronic based interface for grid integration of SG based WEGS and hence does not produce harmonics. Moreover, control of the proposed method is simple. In order to realize the proposed scheme, a digital simulation model of the proposed method has been developed under MATLAB/ Simulink environment. The power flow from the SG to the grid using the model has been studied and its results have been discussed. Keywords-grid integration; synchronous generator (SG); power flow; variable frequency transformer (VFT); wind energy generation system (WEGS)

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“…The actual amplitude and the peak of the transient torque are closely dependent on the rotor speed, switching instant of the voltage wave and duration of the interruption. In the worst case, the first peak may reach about 15 breakage due to fatigue loading, particularly at the coupling with the wind turbine [6]. An arrangement with a tap-changing transformer and a phase-shifting transformer is used to connect two different power systems and to control power flow along a transmission line [7]- [9].…”

Section: Introductionmentioning

confidence: 99%

“…The requirement of HVDC link, phase shifting transformers and the problem of re-switching are eliminated by putting a variable frequency transformer (VFT) in between two asynchronous power systems [11]- [15]. In fact, VFT is rotated at a particular torque and a particular speed.…”

Section: Introductionmentioning

confidence: 99%

Flexible asynchronous ac link for power system network interconnection

Imdadullah¹,

Irshad

Asghar

et al. 2012

2012 IEEE Energytech

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The primary reason for interconnections among different power grids is to reduce the overall economic costs as well as increase reliability and security of supplying electricity services. Thus, for electrical power flow from one power system or grid to another power system or grid a simple, reliable and low cost interconnection is needed. In this paper, a flexible ac power transmission link technology has been proposed for linking two asynchronous independent power systems. The proposed flexible asynchronous ac link (FASAL) system essentially consists of a rotating transformer which is put in the ac tie line between two separate power systems or grids. It controls the power transmission between these power systems which are asynchronous under some or all operating conditions. The direction and the magnitude of power flow is controlled by controlling voltage and/or frequency. Simulink model of proposed FASAL system has been developed for the analytical study and the result verifies the power transfer capability of the proposed system. Index Terms--Flexible asynchronous ac link, power system interconnection, transfer of power, freely rotating asynchronous machine.

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Variable Frequency Transformer—Concept and Electromagnetic Design Evaluation

Cited by 54 publications

References 6 publications

A new synchronous generator based wind energy conversion system feeding an isolated load through variable frequency transformer

A new synchronous generator based wind energy conversion system feeding an isolated load through variable frequency transformer

A novel method for grid integration of synchronous generator based wind energy generation system

Flexible asynchronous ac link for power system network interconnection

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