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Institution

Hydro-Québec

GovernmentMontreal, Quebec, Canada
About: Hydro-Québec is a government organization based out in Montreal, Quebec, Canada. It is known for research contribution in the topics: Electric power system & Dielectric. The organization has 2596 authors who have published 4433 publications receiving 100878 citations.


Papers
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Journal ArticleDOI
TL;DR: This paper provides a methodology to test existence, type, and strength of changes in the distribution of a sequence of hydrometeorological random variables based on Bayesian model selection and is illustrated using univariate normal models.

104 citations

Proceedings ArticleDOI
19 May 2008
TL;DR: The design of a teleoperated robot called the LineScout, which has the capacity to cross obstacles found on the line and is validated, fully tested and ready to undertake pilot projects.
Abstract: Power line inspection and maintenance are fields of application where robotics has yet to be introduced. However, as in many other hostile environments, substantial benefits in terms of workers safety and quality of inspection results could arise. This paper describes one of the latest initiatives toward that goal by presenting the design of a teleoperated robot called the "LineScout". This moving platform has the capacity to cross obstacles found on the line. Special care was taken early in the design phase to account for the context of power utility operation and to customize the geometric parameters to the specific features of the electric power network. The final prototype incorporates several key mechanical design features, which are briefly described. The LineScout is now validated, fully tested and ready to undertake pilot projects.

104 citations

Journal ArticleDOI
TL;DR: In this paper, a new algorithm is described to solve the static, time-invariant weighted least-square state estimation problem for large-scale electric power systems, which is obtained through P-θ and Q-V decoupling and alternately iterating the active and reactive equations using fixed, simplified submatrices of the information matrix.
Abstract: A new algorithm is described to solve the static, time-invariant weighted least-square state-estimation problem for large-scale electric power systems. The solution is obtained through P-θ and Q-V decoupling and alternately iterating the active and reactive equations using fixed, simplified submatrices of the information matrix. Thus, a much faster algorithm is obtained yielding the exact solution and requiring little computer storage. The new method is compared with the basic "Weighted-least-square" and the "Line-Only" algorithms on a practical HV network.

104 citations

Journal ArticleDOI
TL;DR: In this paper, a voltage stability constrained optimal power flow (VSC-OPF) approach based on static line voltage stability indices was proposed to simultaneously improve voltage stability and minimise power system losses under stressed and contingency conditions.
Abstract: Voltage stability improvement is a challenging issue in planning and security assessment of power systems. As modern systems are being operated under heavily stressed conditions with reduced stability margins, incorporation of voltage stability criteria in the operation of power systems began receiving great attention. This study presents a novel voltage stability constrained optimal power flow (VSC-OPF) approach based on static line voltage stability indices to simultaneously improve voltage stability and minimise power system losses under stressed and contingency conditions. The proposed methodology uses a voltage collapse proximity indicator (VCPI) to provide important information about the proximity of the system to voltage instability. The VCPI index is incorporated into the optimal power flow (OPF) formulation in two ways; first it can be added as a new voltage stability constraint in the OPF constraints, or used as a voltage stability objective function. The proposed approach has been evaluated on the standard IEEE 30-bus and 57-bus test systems under different cases and compared with two well proved VSC-OPF approaches based on the bus voltage indicator L - index and the minimum singular value. The simulation results are promising and demonstrate the effectiveness of the proposed VSC-OPF based on the line voltage stability index.

103 citations

Journal ArticleDOI
TL;DR: In this paper, the performance of blended ash geopolymer concrete at elevated temperatures was investigated by using X-ray diffraction, fourier transformed infrared spectrometer, thermogravimetry analyser and field emission scanning electron microscope.
Abstract: This study involved laboratory investigation of the performance of blended ash geopolymer concrete at elevated temperatures. Geopolymer concrete composite was prepared using blended ash, pulverized fuel ash, and palm oil fuel ash, obtained from agro-industrial waste along with alkaline activators. The samples were heated up to 800 °C to evaluate mass loss, strength, and microstructural changes due to thermal impact. Ordinary Portland cement (OPC) concrete was prepared as control concrete. The deterioration of concrete at elevated temperatures was examined by X-ray diffraction, fourier transformed infrared spectrometer, thermogravimetry analyser and field emission scanning electron microscope. A comparison between the performance of geopolymer and OPC concretes—the former exhibited better performance at elevated temperature.

103 citations


Authors

Showing all 2603 results

NameH-indexPapersCitations
John B. Goodenough1511064113741
Mark Sutton128100978703
Pierre Legendre9836682995
Jackie Y. Ying8958735694
Karim Zaghib6953316785
Geza Joos6751415880
M. V. Reddy6625415772
Kamal Al-Haddad6182821017
Jean-Pol Dodelet5916418473
Taha B. M. J. Ouarda5834912230
Michael R. Wertheimer5432011003
Richard Martin5433911465
Michel Armand5415244873
Marc Lucotte501698088
Abdelbast Guerfi492156739
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20231
202256
2021115
2020173
2019162
2018156