Raleigh, NC, United States
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.

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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.


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.


Aguero J.R.,Quanta Technology, LLC
IEEE Power and Energy Society General Meeting | Year: 2012

Self-healing schemes in the context of power distribution systems have the objective of performing fault location, isolation, and service restoration in an automated fashion, i.e., without (or with limited) distribution system operator and repair crew intervention. Some of the intrinsic benefits of this smart distribution technology are increased reliability due to outage duration reduction, more efficient use of personnel and resources (crews, operators, vehicles, etc), and increased operational flexibility. Reliability is naturally increased since less time is needed for locating and isolating faulted feeder areas, as well as for restoring customers located on healthy feeder sections. Self-healing schemes are an inherent part of the Smart Grid and are expected to play a fundamental role in modern and future distribution systems. It is worth noting that the switchgear technology (protective and switching devices, including adaptive protection), sensors, enterprise systems and communications infrastructures required for the implementation of self-healing schemes represent the basis for the execution of other smart distribution applications such as automated system reconfiguration and optimization. Therefore, a growing number of self-healing projects are being implemented by utilities as part of their power delivery modernization plans. This paper discusses the estimation of reliability benefits of self-healing schemes, with emphasis on Fault Location, Identification and Service Restoration (FLISR) applied to real distribution feeders. © 2012 IEEE.


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

Solar photovoltaic distributed generation (PV-DG) systems are one of the fastest-growing types of renewable energy sources being integrated worldwide onto distribution systems. Many North American utilities, governed by state or provincial incentives and/or mandated by green-generation portfolio requirements, are facing installations of large PV plants with capacities in the order of several megavoltamperes (MVAs) that are owned either by the utility or by private power producers. © 2011 IEEE.


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.


Patent
Quanta Technology, LLC | Date: 2016-02-23

A voltage stability monitoring apparatus monitors the voltage stability of a transmission corridor through which power flows between different parts of a power system. The apparatus monitors an equivalent load impedance at an interface between the transmission corridor and a part of the power system designated as generating the power. This equivalent load impedance at the interface comprises a ratio of a voltage phasor at the interface to a current phasor at the interface. The apparatus tracks a Thevenin equivalent voltage and impedance of the designated part by separately updating that voltage and impedance. Notably, the apparatus updates the imaginary part of the Thevenin equivalent voltage to reflect the magnitude of any changes in the voltage phasor that are associated with large variations in the magnitude of the equivalent load impedance at the interface. The apparatus computes an index indicating the voltage stability as a function of this tracked Thevenin equivalent voltage and impedance


An airflow reduction system includes an insulating panel assembly for sealing a window within a jamb. The insulating panel assembly has a frame configured to fit within the jamb and a glazing panel in the frame coated with a low-emissivity or solar control coating or film. The frame may include one or more cavities extending along its length. The assembly may also include a blind stop and/or a trim stop installed on either side of the frame within the jamb. A compressible seal around the external perimeter of the frame bears against the jamb to form a first barrier impeding the flow of air, and the blind stop or the trim stop forms a second barrier impeding the flow of air. Also disclosed is a mounting assembly including an insulating panel assembly and at least one bracket and a method of installing the same.


An improved hydrocarbon conversion catalyst is obtained through removal and modification by various means, of detrimental large and/or small particle fractions. Such modified fractions may be reused in the same or similar processes. The improved catalyst is advantageous to a wide range of hydrocarbon conversion processes.


Patent
Quanta Technology, LLC | Date: 2013-11-04

A voltage stability monitoring apparatus monitors the voltage stability of a transmission corridor through which power flows between different parts of a power system. The apparatus monitors an equivalent load impedance at an interface between the transmission corridor and a part of the power system designated as generating the power. This equivalent load impedance at the interface comprises a ratio of a voltage phasor at the interface to a current phasor at the interface. The apparatus tracks a Thevenin equivalent voltage and impedance of the designated part by separately updating that voltage and impedance. Notably, the apparatus updates the Thevenin equivalent voltage to reflect the magnitude of any changes in the voltage phasor that are associated with large variations in the magnitude of the equivalent load impedance at the interface. The apparatus computes an index indicating the voltage stability as a function of this tracked Thevenin equivalent voltage and impedance.


Patent
Quanta Technology, LLC | Date: 2014-05-19

A voltage stability monitoring apparatus monitors the voltage stability of a transmission corridor through which power flows between different parts of a power system. The apparatus monitors an equivalent load impedance at an interface between the transmission corridor and a part of the power system designated as generating the power. This equivalent load impedance at the interface comprises a ratio of a voltage phasor at the interface to a current phasor at the interface. The apparatus tracks a Thevenin equivalent voltage and impedance of the designated part by separately updating that voltage and impedance. Notably, the apparatus updates the imaginary part of the Thevenin equivalent voltage to reflect the magnitude of any changes in the voltage phasor that are associated with large variations in the magnitude of the equivalent load impedance at the interface. The apparatus computes an index indicating the voltage stability as a function of this tracked Thevenin equivalent voltage and impedance.

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