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This paper presents an innovative approach to calculate non-technical losses estimates in electrical distribution feeders which is based on the customers' energy consumption bills and on measurements of the injected active and reactive powers in the feeder at the substation coupling point. The proposed procedure uses the load flow Power Summation Method (PSM) which is modified to take into account...
This work presents an analysis of steady-state operation of doubly-fed induction generator (DFIG) wind turbines integrated in a power system. It is of interest to use the load flow analysis for obtaining initial conditions for the dynamic analysis of the DFIG in power system stability studies, as the variables in dynamic models must coincide with those in stationary models during steady-state operation...
Genetic Algorithm (GA) is a non-parametric optimization technique that is frequently used in problems of combinatory nature with discrete or continuous variables. In treating with multi-objective evaluation functions it is important to have an adequate methodology to solve the multiple objectives problem so that each partial objective composing the evaluation function is adequately treated in the...
It is proposed in this paper a methodology to obtain optimal controllers gains for the rotor-side converter of doubly fed induction generators (DFIGs) using a genetic algorithm approach. The main objective is to enhance the operational security and robustness of the power system, by a more effective contribution of the DFIG controllers to the system controllability. To reach this goal, the crow-bar...
This paper explores the performance of alternative voltage control strategy applied to direct drive synchronous wind generators, more specifically with permanent magnetic (PMSG). The reactive power control of the grid-side converter is investigated for voltage control purposes. In Brazil, the Grid National Operator (ONS) requires that wind turbines stay connected to the grid during voltage dips, but...
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