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Raleigh, NC, United States

Quanta Technology LLC is a utility infrastructure consulting company based in Raleigh, North Carolina. It is a wholly owned subsidiary of Quanta Services. Wikipedia.


Abed N.Y.,Quanta Technology, LLC | Mohammed O.A.,Florida International University
IEEE Transactions on Magnetics | Year: 2010

This paper proposes a computational high-frequency transformer model. The model parameters are obtained by using coupled-circuit-finite-element (FE) nonlinear analysis. The frequency response of the transformer was obtained by coupling the transformer FE model and external electric circuits. This technique would allow the physical representation of the nonlinear magnetization behavior of the transformer as well as the strong frequency dependence of the transformer parameters. The self capacitance of each conductor and the mutual capacitances between the turns were calculated by an electrostatic FE analysis. The capacitance order was then reduced to a lower order by shifting the capacitances connected to internal nodes (windings) to the external ones (coil nodes). The resulting reduced capacitances, along with the inductances and resistances, were then used in the circuit domain of the coupled circuit-FE analysis. The transformer frequency response was then obtained from FE analysis. This response was then fitted with rational function approximation. This rational function approximation is then used to construct a frequency-dependent branch (FDB) which is connected in parallel with the nominal frequency transformer model. The FDB branch represents the transformer high-frequency behavior over a wide frequency range. The implementation is performed on a 125-kVA transformer. The developed model terminal behavior was tested under different operating conditions. This includes different switching frequencies and connecting cable length. © 2006 IEEE. Source


Rai D.,University of Saskatchewan | Faried S.O.,University of Saskatchewan | Ramakrishna G.,University of Saskatchewan | Edris A.-A.,Quanta Technology, LLC
IEEE Transactions on Power Systems | Year: 2011

The recently proposed phase imbalanced series capacitive compensation concept has been shown to be effective in enhancing power system dynamics as it has the potential of damping power swing as well as subsynchronous resonance oscillations. In this paper, a comparative effectiveness of two hybrid series capacitive compensation schemes in damping inter-area oscillations is evaluated. A hybrid scheme is a series capacitive compensation scheme, where two phases are compensated by fixed series capacitor (C) and the third phase is compensated by either a TCSC or SSSC in series with a fixed capacitor (C c). The effectiveness of both schemes in damping inter-area oscillations for various network conditions, namely different system faults and tie-line power flows, is evaluated using the EMTP-RV time simulation program. © 2011 IEEE. Source


Abed N.Y.,Quanta Technology, LLC | Mohammed O.A.,Florida International University
IEEE Transactions on Magnetics | Year: 2011

This paper proposes a frequency-dependent electromagnetic model for armored power cables using Coupled circuit-field method. The model parameters were obtained by conducting a series of coupled field-circuit studies at different frequencies. The cable capacitance matrix is calculated using an electrostatic FE analysis. The frequency response of the cable was obtained by coupling the cable FE domain model and external electric circuits. This technique allows the physical representation of the nonlinear magnetization behavior of the cable shell as well as the frequency dependence of the cable parameters. This frequency response was then fitted with rational function approximation. The resulting vector fitting (VF) rational function was then represented by an equivalent electrical network. This model represents the cable's high-frequency dynamic behavior to account for overvoltages or spikes in the current waveforms. © 2011 IEEE. Source


Yazdani A.,Quanta Technology, LLC | Sepahvand H.,Missouri University of Science and Technology | Crow M.L.,Missouri University of Science and Technology | Ferdowsi M.,Missouri University of Science and Technology
IEEE Transactions on Industrial Electronics | Year: 2011

Many static synchronous compensators (STATCOMs) utilize multilevel converters due to the following: 1) lower harmonic injection into the power system; 2) decreased stress on the electronic components due to decreased voltages; and 3) lower switching losses. One disadvantage, however, is the increased likelihood of a switch failure due to the increased number of switches in a multilevel converter. A single switch failure, however, does not necessarily force an (2n + 1)-level STATCOM offline. Even with a reduced number of switches, a STATCOM can still provide a significant range of control by removing the module of the faulted switch and continuing with (2n - 1) levels. This paper introduces an approach to detect the existence of the faulted switch, identify which switch is faulty, and reconfigure the STATCOM. This approach is illustrated on an eleven-level STATCOM and the effect on the dynamic performance and the total harmonic distortion (THD) is analyzed. © 2011 IEEE. Source


Aguero J.R.,Quanta Technology, LLC
IEEE Power and Energy Magazine | Year: 2011

The power industry is experiencing a radical transformation as a consequence of the introduction of the smart grid concept. Some of the main features of the smart grid are increased participation by customers and the abilities to accommodate all generation and storage technologies; enable new products, services, and markets; provide increased reliability and power quality; optimize asset utilization and operating efficiency; provide self-healing capability in response to distribution system disturbances; and operate resiliently against physical and cyber attacks and natural disasters. © 2011 IEEE. Source

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