Hydro-Québec

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.

Modeling a mixed residential-commercial load for simulations involving large disturbances

Abstract: A detailed EMTP model of a mixed residential-commercial load valid for large voltage variations has been developed. Once validated against field recordings, the model has been used to study the static, dynamic and post-fault recovery characteristics of the real load. From the simulation results, guidelines for modeling this type of load in dynamic studies such as first swing, transient and voltage stability were established. It is expected that the same methodology applied to other loads of reasonably known composition would guarantee more realistic results than those obtained with current practices.

Velocity-space structure of runaway electrons

Abstract: The region of velocity space is determined in which electron runaway occurs because of a dc electric field. Phase‐space analysis of the relaxation equations describing test electrons, corroborated by two‐dimensional (2‐D) numerical integration of the Fokker–Planck equation, reveals that the Dreicer condition for runaway v2∥≥(2+Zi)Ec/E is only sufficient. A weaker condition v2∥≥(2+Zi)1/2Ec/E is established, and it is shown, in general, that runaway in velocity space only occurs for those electrons that are outside one of the separatrices of the relaxation equations. The scaling with v∥ of the parallel distribution function and of the perpendicular temperature is also derived.

An intelligent system for advanced dynamic security assessment

Abstract: This paper presents an on-going research project to develop an intelligent system (IS) that can be used together with existing power system dynamic security assessment tools in order to enhance the capabilities of online security assessment for power system operations. The use of intelligent systems in this application is expected to improve the speed, accuracy, and robustness of security assessment. A prototype system named POSSIT, POwer System Security using Intelligent Technologies, is presently being developed. An overview of the functional design of this prototype is given here and shows how this approach is applied to the Hydro-Quebec and BC Hydro power systems.

Load Response Coefficients Monitoring System : Theory and Field Experience

Abstract: The active and reactive powers, at a high voltage bus level, have generally been modelled either as functions of the time of the day or as load response functions of voltage and frequency changes (at a given time). The study of the dependence of these load response coefficients on time and weather has not been possible until now, since the determination of these coefficients required test perturbations. A mobile mini-computer based load response coefficient monitoring system has been conceived and tested, based on an estimation procedure requiring no test perturbations. Results, including the load response coefficients at about 6-minute intervals, from the operation of the system, at two Hydro-Quebec 120 kV substations, are also presented.