VFT Applications Between Grid Control Areas

Marczewski, J.J.

doi:10.1109/pes.2007.386183

Cited by 22 publications

(3 citation statements)

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“…Utilities sometimes use Back-To-Back HVDC or BTB links [8] and Variable Frequency Transformers (VFTs) [9][10][11] to control transfer power transfer between two areas. Both of these solutions are used in lieu of an ac tie-line because the phase angle between the two connected networks can vary substantially, resulting in an overload of a simple tie-line.…”

Section: B Comparison With Existing Power Flow Controllersmentioning

confidence: 99%

Integrated fault current limiter and power flow controller for grid tie-lines

Das

Divan

Lambert³

2009

2009 IEEE Power &Amp; Energy Society General Meeting

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The drive for higher reliability has motivated many utilities to move to a more meshed system. Increasing interconnection increases the reliability but on the down side also increases the fault current levels. High fault current levels increase the stresses on the existing circuit breakers, which are expensive to replace. Fault current limiters are used to reduce the fault currents below the ratings of the circuit breakers in order to prevent any permanent damage or malfunction of the circuit breakers. The paper proposes a dual device which not only can limit the fault current, but also can control the power flow through the transmission line in steady state.

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Section: B Comparison With Existing Power Flow Controllersmentioning

confidence: 99%

Integrated fault current limiter and power flow controller for grid tie-lines

Das

Divan

Lambert³

2009

2009 IEEE Power &Amp; Energy Society General Meeting

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“…The magnitude and the direction of power flow through the VFT is controlled by means of a drive motor and a variable speed drive system used to apply a torque to the rotor of the transformer thus adjusting the rotor position with respect to the stator which consequently controls the power flow. [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Asynchronous grid interconnection using brushless Doubly Fed Induction Machines: Assessment on various configurations

Abdelkader

Abdelsalam

Hossam

2014

2014 16th International Power Electronics and Motion Control Conference and Exposition

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Electric power systems are commonly interconnected for cost effiective robust delivery purposes. Transmission interconnection benefits from load diversity, variety of sources and fuel prices. In addition; nation-level grid interconnection offers increased reliability, reduction of power interruption and generation-cost minimization. Various techniques are applicable for grid interconnection like High Voltage Direct Current links (HVDC), Variable Frequency Transformer (VFT) and Doubly Fed Induction Machine (DFIM). The development in machine construction enhances their capability. Various DFIMs are currently available such as the brushless twin stator cascaded doubly fed induction machines (BTDFIM) and the single frame brushless doubly fed induction machine (BDFIM). This paper discusses the application of grid interconnection using various doubly fed induction machines illustrating machine construction, operation and limitations.

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“…The BTB provides a wide control range and can even connect two asynchronous systems. The Variable Frequency Transformer (VFT) is another alternate solution for two area interconnection [3][4][5][6]. It uses a rotating transformer to allow interconnection between two areas having two different frequencies or phase angles.…”

Section: Introductionmentioning

confidence: 99%

Power flow control in networks using controllable network transformers

Das

Divan

2009

2009 IEEE Energy Conversion Congress and Exposition

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The drive for higher reliability has motivated many utilities to move towards a more meshed system. Two control areas are often connected together with tie-lines. Power flow through the tie-lines connecting two control areas is difficult to control. This lack of controllability of power flow is one of the major issues in the modern grid. It causes asymmetric stress on the grid assets. This makes some grid assets more vulnerable to failure than others and therefore decreases the overall system reliability. Presently utilities can achieve very limited power flow control using devices like Load Tap Changing (LTC) transformers and Phase Shifting Transformers (PST). Controllable Network Transformers (CNT) were introduced as a simple, low cost solution to the power flow problem. This paper develops a theoretical analysis for the operation of CNT in a meshed network. It also shows the various possible applications of the CNT. Experimental validation of the working principle of a small scale prototype CNT is also provided.Index Terms --Load flow control, Power system control, Smart Grid I.

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VFT Applications Between Grid Control Areas

Cited by 22 publications

References 0 publications

Integrated fault current limiter and power flow controller for grid tie-lines

Integrated fault current limiter and power flow controller for grid tie-lines

Asynchronous grid interconnection using brushless Doubly Fed Induction Machines: Assessment on various configurations

Power flow control in networks using controllable network transformers

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