aref jalili irani

Phase Unbalance in distribution networks is one of the unavoidable problems that results from presence of single-phase charges and diversity of consumption among customers. This paper aims to study unusable capacity in distribution transformers due to phase Unbalance through proposing a new coefficient for estimating their capacity. In this study, the primary reasons which lead to Unbalance in transformers have been studied, then unusable capacity in transformers and phase Unbalance index have been formulated , and finally, real results on two posts related to Ardabil electricity distribution network have been evaluated, information corresponded to sample posts has been acquired through installing data logger machine, type TDL 104 for a week and using hour-to-hour sampling method. The results form machine have been analyzed using Matlab software, and then related diagrams have been drawn and also comparison among them has been done. Finally, the effect of phase Unbalance in estimating transformers’ capacity has been proposed by a coefficient.

The Microgrid is a small-scale controlled power system, which can be used in islanded mode or in a grid-connected one to provide power. In the islanded Microgrid, the system frequency will be affected severely by the smallest disturbance which can happen due to light inertia in the system. In the independent Microgrid, several generation sources such as solar, wind, and so on can be considered. In addition to these power plants, the discussion of energy conversion as a result of temperature changes can be considered as a thermoelectric converter. In the present article, the effort has been made to propose a microgrid model which incorporates a Thermoelectric Generator (TEG) system. In this system, due to the variety of uncertainties and load variations, an advanced controller must be developed to improve the dynamic stability and reliability of the microgrid system. The Improved Fuzzy Fractional-Order PID is the suggested controller. The proposed controller is applied to a sample islanded microgrid to establish a robust evaluation and to be checked under parametric changes, great demands, and disturbances. The offered controller is compared with those of other PID, FOPID and FPID controllers. The results of simulations reveal that the proposed controller has a proper and robust performance.

In this paper, at first the modeling of wind turbines equations is studied, then using obtained equations a proportional integral derivative controller (PID) system is designed for system. PID coefficients derived using once SOA algorithm and then CSO algorithm and the results were compared with each other. Simulation of system was performed using MATLAB software.

Phase Unbalance in distribution networks is one of the unavoidable problems that results from presence of single-phase charges and diversity of consumption among customers. This paper aims to study unusable capacity in distribution transformers due to phase Unbalance through proposing a new coefficient for estimating their capacity. In this study, the primary reasons which lead to Unbalance in transformers have been studied, then unusable capacity in transformers and phase Unbalance index have been formulated, and finally, real results on two posts related to Ardabil electricity distribution network have been evaluated, information corresponded to sample posts has been acquired through installing data logger machine, type TDL 104 for a week and using hour-to-hour sampling method. The results form machine have been analyzed using Matlab software, and then related diagrams have been drawn and also comparison among them has been done. Finally, the effect of phase Unbalance in estimating transformers’ capacity has been proposed by a coefficient.