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Up to now, preventive or corrective actions to improve power systems' operating states mainly concern power generation rescheduling, load-shedding and tap modifications of in-phase or phase-angle transformers. A method is proposed for relieving overloads b ...
The most critical viewpoints and requirements of potential users are discussed, and a practical and descriptive definition of what an expert system does (rather than what it is) is proposed. The costs and benefits of its adoption are assessed, and lessons ...
The paper deals with the main problems to solve in order to simulate precisely the behavior of complex power systems with mixed elements (power components and digital regulation devices). A simulation tool developed at the Swiss Federal Institute of Techno ...
Similar to the classical solution of hydraulic pump-turbine plant, new means for accumulation of eletrical energy are given for lower but respectable quantities by the so called BESS (Battery Energy Storage System) and SMES (Super conducting Magnet Energy ...
To get rid of all numerical aspects in flow simulation results and to have more informations about the evolution of the physical values inside the computational domain, we have developed a controlling and analysing method of these results. This method is b ...
The authors specify a network simplex method of the load-flow calculation in a power system. The proposed model is an imaginary and real current one. It is based on a simplifying assumption which allows decoupling of the problem and which is the basis of t ...
Transient stability investigations consist of studying the rotor oscillations of generators (electro-mechanic oscillations, 0.1-2 Hz) after the occurrence of a fault of large amplitude, e.g. short circuit. The goal is to indicate if the generators are capa ...
An iterative and decoupled method is proposed for solving the general active/reactive constrained power flow problem, based on rectangular coordinates of injected currents. Successive linear programming with dual-relaxation method is used. The general obje ...
Efficient techniques using linear programming already exist for solving the constrained power flow problem limited to the active powers only (DC-flow model). However the DC-flow approximation may not be sufficiently accurate for analyzing the security of s ...
This thesis is dedicated to the study of electrical power system security analysis in steady state. The problem consists in identifying quickly and precisely the contingencies which create thermal constraints violations. The suggested approach is based on ...
