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The main goal of this paper is to obtain the optimal Distributed Generation (DG) investments as well as purchase additional power from Transmission Companies (TRANSCOs). To do this, a new mathematical modeling and a new software package interfacing between the two powerful softwares MATLAB and GAMS are used. The proposed model optimizes total system planning costs and consequently costumers’ bills, reduces total system losses, guaranties system voltage profiles and prevents feeders’ congestion. This new model and software package have been executed in two different cases depending if system voltage profiles are in their permissible margin or not; in each case, three different scenarios are studied, depending on planning problem constraints. The simulation results show the economical and electrical benefits of DG installation by solving the distribution system planning problem and by improving power quality of the distribution system. It is illustrated that DG installation also can increase the main feeders’ lifetime by reducing their loading and adds the benefit of using the existing distribution system for further load growth without the need for feeders upgrading

In this paper, we proposed a new control method for a three-phase hybrid active filter, based on a classical active filter topology connected in series with a passive filter. The non linear load is a diode rectifier feeding a (R, C) parallel load. The proposed method is based on two Self Tuning Filters placed in both feedback and feedforward loops dedicated to eliminate the 5th and 7th harmonic frequency. The feedforward loop consists in two branches, the first one to remove the 5th harmonic and the second one to remove the 7th harmonic frequency. The use of Self Tuning Filters simplifies the control scheme by reducing the number of extraction filters used in classical feedback and feedforward loops. More, in this case, no Phase Locked Loop is necessary for the feedforward loop. The effectiveness of the new proposed scheme has been verified by computer simulation and the results are compared with the classical control scheme

This paper presents a novel fault tolerant converter topology for grid connected Wind Energy Conversion System (WECS) with Doubly Fed Induction Generator (DFIG). This topology allows fast fault detection and compensation of one of the semiconductors or drivers by using isolating and connecting devices. It is based on a unique redundant leg for both back to backconverters. We present a new detection algorithm, robust to false fault detection due to semiconductor switching. Simulation results are presented cases on both back-to-back converters and both hyper and hypo synchronous conditions.