Evaluation of the Performance of Back-to-Back HVDC Converter and Variable Frequency Transformer for Power Flow Control in a Weak Interconnection

Bagen, B.; Jacobson, David; Lane, Georges; Turanli, H.

doi:10.1109/pes.2007.385809

Cited by 43 publications

(23 citation statements)

References 2 publications

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“…Assuming the constant stator 215 voltage in (10), it can be noticed that by changing the torque 216 applied through dc motor drive, the stator active current (I S ) 217 can be changed. This proves the correlation between torque 218 applied by dc motor drive and active current transferred through 219 VFT according to (5). A simple armature voltage controlled 220 four quadrant dc drive can be employed to regulate the torque 221 produced by the dc motor and thereby active power transfer.…”

Section: E E E P R O O Fmentioning

confidence: 77%

A Hierarchical Control Strategy With Fault Ride-Through Capability for Variable Frequency Transformer

Ambati¹,

Kanjiya²,

Khadkikar³

et al. 2015

IEEE Trans. Energy Convers.

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Section: E E E P R O O Fmentioning

confidence: 77%

A Hierarchical Control Strategy With Fault Ride-Through Capability for Variable Frequency Transformer

Ambati¹,

Kanjiya²,

Khadkikar³

et al. 2015

IEEE Trans. Energy Convers.

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“…3). If a disturbance of the state variable is applied at the limit cycle , then (3) takes the form (4) The linearization of (4) taking first-order terms in the Taylor series expansion results in (5) where the matrix of partial derivatives represents the Jacobian matrix of (3). Simplifying (5) it follows: (6) and the perturbation evolves according to [13] (7)…”

Section: Limit Cycle Methodsmentioning

confidence: 99%

“…In a harmonic-oriented contribution [4], a finite-element analysis is employed to accurately study the performance of the rotary machine incorporated with the VFT. Two power-flow concepts based on a back-to-back HVDC and 0885-8977/$26.00 © 2011 IEEE a VFT are evaluated for power-flow control in a weak power grid using PSS/E simulations [5]. Furthermore, a review of actual and potential VFT installations is presented in [6], which emphasizes increasing interest to operate a set of VFTs in a coordinated fashion with a back-to-back HVDC.…”

Section: Introductionmentioning

confidence: 99%

Stability Analyses of a VFT Park Using a Sequential Continuation Scheme and the Limit Cycle Method

Contreras-Aguilar

García

2011

IEEE Trans. Power Delivery

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A new procedure to determine the stability of a steady-state solution based on a sequential continuation scheme, Floquet theory and the limit cycle method is presented in this paper. The continuation scheme relies on an efficient predictor-corrector scheme, where the correction is accomplished through the limit cycle method. Furthermore, a comprehensive variable frequency transformer (VFT) Park model is proposed to study the stability of asynchronous links. The VFT Park allows the simulation of multiunit VFTs operated in parallel in order to increase the power transfer between two electric power networks. Each VFT unit consists of a wound-rotor asynchronous machine, a dc motor, and a control system, which provides power transfer regulation using power and speed controllers. The steady-state operating point of a VFT Park consisting of three 100-MW VFT units is computed with the limit cycle method for a set of heterogeneous operating scenarios. Stability diagrams are reported for changes of the VFT parameters, power transfer, and frequency on both sides of the asynchronous link. Even though the VFT is operated within its rated power transfer limits, simulation results reveal that a VFT may become unstable not only for changes of power transfer but also for variations of frequency.Index Terms-Floquet theory, limit cycle method, sequential continuation scheme, stability analyses, variable-frequency transformer (VFT), wound-rotor induction machine. NOMENCLATUREFlux linkage. Stator leakage reactance. Rotor leakage reactance. Magnetizing reactance. Stator angular velocity. Rotor angular velocity. Base angular velocity. Synchronous reference frame. Stator reference frame. Rotor reference frame. Quadrature-axis quantity. Transition matrix. Manuscript received

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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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Evaluation of the Performance of Back-to-Back HVDC Converter and Variable Frequency Transformer for Power Flow Control in a Weak Interconnection

Cited by 43 publications

References 2 publications

A Hierarchical Control Strategy With Fault Ride-Through Capability for Variable Frequency Transformer

A Hierarchical Control Strategy With Fault Ride-Through Capability for Variable Frequency Transformer

Stability Analyses of a VFT Park Using a Sequential Continuation Scheme and the Limit Cycle Method

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

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