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Poryan S.Z.,Higher Power Engineering
SPEEDAM 2010 - International Symposium on Power Electronics, Electrical Drives, Automation and Motion | Year: 2010

It is necessary to plan for estimating and determining the power and energy loss to decrease the loss in distribution companies. It is not simply possible to obtain a comprehensive model and satisfy with theoretical equations, because there are different uses and special environmental conditions in different points of system. Usually, there are differences between accounted amounts of loss and determined amounts. Therefore, dependence on available models and their usage for distribution system, especially for feeders, which have low load or used in special situations causes some mistakes and incorrect results. In this paper, we evaluate accuracy of models in addition to modeling loss at 20kw network model and compare it with the evaluation and measurement method. © 2010 IEEE.

Elsamahy M.,Higher Power Engineering
Proceedings - 2014 Electrical Power and Energy Conference, EPEC 2014 | Year: 2014

In this paper, extensive dynamic simulation studies are carried out to explore the performance of turbo generator loss of excitation (LOE) protection (Relay (40)) in FACTS Controller incorporated transmission networks. These studies have included the performance of LOE protection (Relay (40)) during two LOE modes, a complete LOE (due to field short circuit) and partial LOE (sudden drop of the excitation supply) during different generator loading conditions. The results of these investigations have shown that the presence of a FACTS Controller has a remarkable delay impact on the operation of the turbo generator LOE protection during LOE conditions. In addition, such a delay varies according to the generator loading and the LOE mode. Results have also shown that this delay is dramatically increased during partial LOE for all loading conditions. The dynamic simulations of a test benchmark have been conducted using the PSCAD/EMTDC software. © 2014 IEEE.

Elsamahy M.,Higher Power Engineering
Proceedings - 2014 Electrical Power and Energy Conference, EPEC 2014 | Year: 2014

In this paper investigations are carried out to explore the generalization of the adverse impact of the existing setting of the generator distance phase backup protection (Relay (21)) according to the existing standards on generator over excitation thermal capability during system disturbances. These investigations are conducted in two stages, the first includes a SMIB system incorporating a midpoint STATCOM in order to increasing its power transfer capability. The second includes a multi-generator power plant configuration. Both stages have included the performance of Relay (21), during two common system disturbances, namely a system fault and a sudden application of a large system load while the generator over excitation limiter (OEL) is in service. The results of this paper have generalized the restricting impact of the current setting of Relay (21) on the over excitation thermal capability of the generator during system disturbances. Moreover, results also have proven that in-depth stability studies are of high paramount for selecting Relay (21) setting which will allow the generator to ful fill adequate level of voltage stability during system disturbances. © 2014 IEEE.

Beshr E.,Arab Academy for Science and Technology | Sharkawy R.M.,Arab Academy for Science and Technology | Abd El-Hamid A.S.,Higher Power Engineering
Proceedings of the Universities Power Engineering Conference | Year: 2015

Simulation and discrimination of several different types of insulation failure has been proposed. In the present paper, five types of insulation failures that are apt to occur in power transformers are simulated using PSIM. Input-output voltage as well as input current of each insulation failure type is monitored and hence constructing the (ΔV- Iin) locus diagram which is used for providing the state of the transformer. A discrimination process utilizing neural networks is developed to distinguish any deviations of the locus with respect to the reference one. © 2015 IEEE.

Hatami H.,Higher Power Engineering | Sharifian M.B.B.,University of Tabriz
India International Conference on Power Electronics, IICPE | Year: 2012

This paper is aimed to determine a general model for simulating single-phase induction machines operation and investigates the vector control of them. This proposed vector control method is based upon rotor-flux orientation concepts. Iron loss traditionally ignored in vector control schemes. If we neglect the iron loss, then it detunes the overall vector controller and results in an error in the torque control. The iron loss is modeled, in general, by a parallel resistor RM to the magnetizing inductor LM. In this paper a series R-L model that accounts for the effects of the iron loss in presence of magnetizing inductance, in the single-phase induction motor is proposed and a rotor-flux oriented control scheme of this proposed model is investigated. In this paper first the iron loss in a mathematical model of induction machines has been modeled and then applies the control methods. For this reason, the conventional method of operation (with run capacitor) and a vector controlled method for SPIM; both with equivalent element (series resistance RM) to presence of iron loss have been used. Simulation results are provided to illustrate the system operation. © 2012 IEEE.

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