Iran Power Generation, Transmission and Distribution Management Co.

Tabriz, Iran

Iran Power Generation, Transmission and Distribution Management Co.

Tabriz, Iran
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Ghanaatpisheh M.,Iran Power Generation, Transmission and Distribution Management Co. | Pakaein M.,Iran Power Generation, Transmission and Distribution Management Co.
30th Power System Conference, PSC 2015 | Year: 2015

Gas turbines play an important role in supplying power for the country especially in peak electricity load. The main disadvantages are the turbines, they produce large changes are a result of climate change. However, in times of peak electricity grid and at the same time warm months, can produce gas turbines under the effect of ambient temperature, the amount of reduced considerably. The methods adopted for the turbine compressor inlet air cooling and recovery of their power optimization is necessary. In this paper, different methods of cooling the inlet air to gas turbines for Fars power plants weather conditions and eventually introduced various schemes to install combined cycle gas turbine inlet air cooling system of the plant, good design, Media evaporative air cooler system have been selected according to technical and economic evaluation. Media evaporative air cooler by an external contractor blueprint designed, constructed and installed in the plant. Performance tests are conducted at the site, 11 MW equivalent to 14.5 percent for gas units and 1.2 MW (6.2%) for steam combined cycle unit to the circuit after the Media cooling system in the summer show. © 2015 IEEE.


Abjadi N.R.,Shahrekord University | Ghanbari D.,Iran Power Generation, Transmission and Distribution Management Co.
Revue Roumaine des Sciences Techniques Serie Electrotechnique et Energetique | Year: 2017

Direct torque and flux control (DTC) of induction motor (IM) is one of the most effective methods in control of this electric machine. Using DTC the restrictions and complexities of vector control can be avoided. In this paper, the algorithm of DTC of an asymmetrical six-phase induction motor (SPIM) with a two-level voltage source inverter (VSI) is improved. SPIM can be used in high power applications or fault tolerant systems such as traction systems with reduced torque pulsations. The machine is modeled based on vector space decomposition (VSD) theory. Selecting suitable switching vectors the torque and flux of the motor are controlled properly. Using the proposed algorithm, the zero sequence current components are almost zero which is very important in SPIM control; since without them, the harmonics of phase currents are reduced and efficiency is improved considerably. The validity and effectiveness of the proposed method are confirmed by experimental results.


Rezaei S.,Iran Power Generation, Transmission and Distribution Management Co.
IET Conference Publications | Year: 2017

Ferroresonance is phenomena, which emerged in case of different circumstances like; short circuit, breaker phase failure. In addition, line and plant outage is another cause of ferroresonance. This study investigates occurrence of ferroresonance in case of line and plant outage in Manitoba Hydro 230 kV electrical network and enhance flexible mitigation of ferroresonance. The network is simulated In PSCAD/EMTDC software. A ferroresonant state is recognized and analyzed in the network and classified in suitable mode by ferroresonance detection tools. Static Var Compensator is used to mitigate ferroresonance along with controlling voltage and reactive power in the network. Power and control circuit of SVC is designed and examined in ferroresonance.


Rezaei S.,Iran Power Generation, Transmission and Distribution Management Co.
International Journal on Electrical Engineering and Informatics | Year: 2017

Catastrophic circumstances and equipment failures continue to occur due to Ferroresonance even though this phenomenon has been extensively investigated since, many years ago. This study enhances mitigation of Ferroresonance by means of Flexible AC Transmission System. Static var compensator is used to suppress Ferroresonance along with controlling voltage and reactive power in the network. Manitoba Hydro 230 kV electrical network has experienced Ferroresonant states several times. In this paper, by means of PSCAD/EMTDC simulation software, Ferroresonant states are recognized and analyzed in Manitoba Hydro network. Ferroresonant states are classified in adequate modes by Ferroresonance detection tools. Power and control circuit of SVC is designed and Ferroresonant states are examined in presence of SVC. © 2017, School of Electrical Engineering and Informatics. All rights reserved.


Rezaei S.,Iran Power Generation, Transmission and Distribution Management Co.
Conference Proceedings - 2017 17th IEEE International Conference on Environment and Electrical Engineering and 2017 1st IEEE Industrial and Commercial Power Systems Europe, EEEIC / I and CPS Europe 2017 | Year: 2017

Sub Synchronous Resonance (SSR) is a phenomenon which electrical energy is exchanged between generator and transmission system below power frequency. SSR occurs due to interaction of a series compensated transmission line with a generator. It results in shaft oscillation and out of step condition. During SSR, the magnitude of voltage and current is increased. It also increases probable occurrence of ferroresonance. It is obviously clear that protective relays are affected in such conditions. In this paper, Manitoba Hydro electrical network is examined with series capacitors by PSCAD/EMTDC to investigate impact of SSR on operation of different types of protective relays such as distance relay with OSB element, pole slipping, differential and overcurrent relay. © 2017 IEEE.


Arefi A.,Islamic Azad University at Tehran | Olamaei J.,Islamic Azad University at Tehran | Yavartalab A.,Iran Power Generation, Transmission and Distribution Management Co. | Keshtkar H.,Amirkabir University of Technology
Energy Procedia | Year: 2012

The experiences of the loss reduction projects in electric power distribution companies (EPDCs) of Iran are presented. The loss reduction methods, which are proposed individually by 14 EPDCs, corresponding energy saving (ES), Investment costs (IC), and loss rate reductions are provided. In order to illustrate the effectiveness and performance of the loss reduction methods, three parameters are proposed as energy saving per investment costs (ESIC), energy saving per quantity (ESPQ), and investment costs per quantity (ICPQ). The overall ESIC of 14 EPDC as well as individual average and standard deviation of the EISC for each method is presented and compared. In addition, the average and standard deviation of the ESPQs and ICPQs for the loss reduction methods, individually, are provided and investigated. These parameters are useful for EPDCs that intend to reduce the electric losses in distribution networks as a benchmark and as a background in the planning purposes. © 2011 Published by Elsevier Ltd.


Fallahi A.,Iran Power Generation, Transmission and Distribution Management Co. | Ebrahimi R.,Iran University of Science and Technology | Ghaderi S.F.,University of Tehran
Energy | Year: 2011

This paper provides an empirical analysis of the determinants of energy efficiency in 32 power electric generation management companies over the period 2005-2009. The study uses non-parametric Data Envelopment Analysis (DEA) to estimate the relative technical efficiency and productivity change of these companies. In order to verify the stability of our DEA model and the importance of each input variable, a stability test is also conducted. The results of the study indicate that average technical efficiency of companies decreased during the study period. Nearly half of the companies (14) are below this average level of 88.7% for five years. Moreover, it is shown that the low increase of productivity changes is more related to low efficiency rather than technology changes. © 2011 Elsevier Ltd.


Bagheri F.,Niroo Research Institute | Mokarizadeh V.,Niroo Research Institute | Jabbar M.,Iran Power Generation, Transmission and Distribution Management Co.
Energy and Buildings | Year: 2013

In this paper, technical procedure for developing energy performance label for office buildings in Iran is presented. According to inappropriate energy consumption indexes of the office buildings in Iran, present research was conducted for this group of buildings. For this purpose, a building energy simulator software tool was developed, validated, and applied to simulate an exhaustive sample society of office buildings. A widespread field activity was conducted to gather the modeling data from 285 office buildings through all the 4 climatic zones in Iran. Moreover, Reference Buildings as the energy efficient buildings were defined and modeled in the software environment. Energy consumption indexes from modeling of sample society and Reference Buildings were applied to conclude the boundaries for grades A-G of the label. Finally, the label appearance was designed and authorized to be applied for both the existent and new buildings. The upper limit for grade A is determined as: 84, 75, 78, and 82 (kWh/Y/m2) and the upper limit of grade G (the failing point) is concluded as: 588, 525, 546, and 574 (kWh/Y/m2) for cold, mild, hot and dry, and hot and wet climatic zones, respectively. © 2013 Elsevier B.V.


Rezaei S.,Iran Power Generation, Transmission and Distribution Management Co.
2015 IEEE 15th International Conference on Environment and Electrical Engineering, EEEIC 2015 - Conference Proceedings | Year: 2015

Catastrophic circumstances and equipment failures in electrical networks are mostly caused by emerging unidentified phenomena. Resonance and Ferroresonance are those phenomena, which have been investigated since, many years ago. Manitoba Hydro 230 kV electrical network has experienced Ferroresonant states several times. Such conditions may occur in effect of short circuit, breaker phase failure, transformer energizing, load rejection, accidental or scheduled line disconnection, and plant outage. One of the significant consequences of resonant and Ferroresonant states can be an apparent mis-operation or tripping some protective devices and inaccurate operation of instrument transformers. In this paper by means of PSCAD/EMTDC simulation software, Ferroresonant states are analyzed in Manitoba Hydro 230 kV network. Ferroresonant states are classified in to adequate modes by Ferroresonance detection tools, furthermore; kinds of protective relays subjected to Ferroresonance are simulated in the power network, and operation of relays is assessed. © 2015 IEEE.


Mandegar M.H.,Iran Power Generation, Transmission and Distribution Management Co. | Saidi B.,Iran Power Generation, Transmission and Distribution Management Co. | Roshanali F.,Iran Power Generation, Transmission and Distribution Management Co.
Interactive Cardiovascular and Thoracic Surgery | Year: 2010

Ascending aorta and aortic arch thrombosis is rare in a young man with no risk factor. Here, we report the case of a young male patient with factor V Leiden mutation who developed ascending aorta and aortic arch thrombosis and subsequent emboli. © 2010 Published by European Association for Cardio-Thoracic Surgery.

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