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Farahani, Hassan Feshki
- Evaluation Effective Parameters on the Output Current Harmonics of SHE-PWM Voltage Source Inverter
Abstract Views :418 |
PDF Views:108
Authors
Affiliations
1 Niroo Research Institute, Tehran, IR
2 Department of Electrical Engineering, Ashtian Branch, Islamic Azad University, Ashtian, IR
1 Niroo Research Institute, Tehran, IR
2 Department of Electrical Engineering, Ashtian Branch, Islamic Azad University, Ashtian, IR
Source
Indian Journal of Science and Technology, Vol 5, No 3 (2012), Pagination: 2258-2263Abstract
Many important parameters are effective on the output current of voltage source inverter (VSI) that among them load type, frequency, and load connection can be mentioned. In VSI, the current waveform is affected from mentioned parameters. Variation of these parameters can change the output current total harmonic distortion (THD). It is desired that the output current waveform to be close to sinusoidal. In this paper, by constructing a VSI, effect of load connection, frequency, and load type such as resistive, resistive-inductive, and inductive on VSI output current harmonics are investigated. For this purpose, different operational modes are defined for two structures of VSI, and effects of these parameters on output current are evaluated. Also, this voltage source inverter is simulated in PSpice that verify the experimental results.Keywords
Power Quality, SHE-PWM, Voltage Source Inverter, Selective Harmonic Elimination, Modulation Index, Load Type And PspiceFull Text
References
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- Monitoring of Induction Motor Temperature under Unbalanced Supplying by Stator Resistance Estimation
Abstract Views :400 |
PDF Views:223
Authors
Affiliations
1 Department of Electrical Engineering, Ashtian Branch, Islamic Azad University, Ashtian, IR
1 Department of Electrical Engineering, Ashtian Branch, Islamic Azad University, Ashtian, IR
Source
Indian Journal of Science and Technology, Vol 5, No 3 (2012), Pagination: 2354-2359Abstract
Motor parameters estimations are needed for many applications. One of these parameters is stator winding resistance. Induction motor temperature can be monitored by this parameter estimation under balanced and unbalanced condition. For this purpose, a DC signal is injected to AC voltage. In this study, stator temperature is obtained from two methods. One of them is measuring by construction of a temperature measurement system using sensor-installing method and the other method is measuring temperature by Stator Winding Estimating (SWE). Each method is implemented on a 1.1kW / 50Hz / 1400rpm three-phase squirrel cage induction motor. After that, different experimental tests have been done on the motor under balanced and unbalanced conditions and they have been evaluated. The capability of measuring temperature from SWE method is investigated and responding of this method to motor thermal characteristics variations and reliable thermal protection are evaluated.Keywords
Sensor Installing, DC Injection, Temperature Monitoring, Induction Motor and Stator WindingFull Text
References
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- Hurst KD and Habetler TG (1997) Thermal monitoring and parameter tuning scheme for induction machines. In: Conf. Rec. IEEE-IAS Annu. Meeting 1, 136-142.
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- Mendes AMS, XM LF et al (2008) Thermal evaluation of TEFC three-phase induction motors under different supply frequencies. Electrical Machines, ICEM 2008. 18th Int. Conf. 1-6.
- Valenzuela MA and Ramírez G (2011) Thermal models for online detection of pulp obstructing the cooling system of TEFC induction motors in pulp area. IEEE Trans. Industrial. Appl. 47, 719-729.
- Wrobel RP, Mellor H et al. (2011) Thermal modeling of a segmented stator winding design. IEEE Trans. Industrial. Appl. 47(5), 2023-2030.
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- Analysis of Current Harmonic on Power System Fuses Using ANSYS
Abstract Views :474 |
PDF Views:141
Authors
Affiliations
1 Department of Electrical Engineering, Ashtian Branch, Islamic Azad University, Ashtian, IR
1 Department of Electrical Engineering, Ashtian Branch, Islamic Azad University, Ashtian, IR
Source
Indian Journal of Science and Technology, Vol 5, No 3 (2012), Pagination: 2396-2400Abstract
One of the most important protective devices in power systems are fuses which have been used for ages. Passing short circuit current from fuse causes to warm fuse element that it will open this path. Fuse temperature can directly affect fuse operation and its melting as well. Therefore, fuse should be designed in a way that it does not operate at nominal current and instantaneous over currents whereas it should operate at error case. In this paper, firstly, fuse element is investigated and its behavior is studied. Then, a sample fuse with its different sections is simulated under sinusoidal and non- sinusoidal currents. After that, different parameters such as thermal distribution, thermal flux, and electrical potential in all fuse parts are obtained for sinusoidal and non-sinusoidal currents. Also, Fuse temperature for various THD values is determined. Finally, an equation to determine fuse nominal current due to harmonics is presented.Keywords
Thermal Flux, Current Harmonics, Power System Fuses, Finite Element Analysis, ANSYSFull Text
References
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- A New Method to Calculate Residential Consumer's Consumption Using Computer Modeling
Abstract Views :549 |
PDF Views:108
Authors
Affiliations
1 Department of Electrical Engineering, Abhar Branch, Islamic Azad University, Abhar, IR
2 Department of Electrical Engineering, Ashtian Branch, Islamic Azad University, Ashtian, IR
3 Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Arak, IR
1 Department of Electrical Engineering, Abhar Branch, Islamic Azad University, Abhar, IR
2 Department of Electrical Engineering, Ashtian Branch, Islamic Azad University, Ashtian, IR
3 Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Arak, IR
Source
Indian Journal of Science and Technology, Vol 5, No 5 (2012), Pagination: 2701-2705Abstract
One of the most important issues in modeling and simulation of electricity distribution systems is to know different customers' consumption, which depends on season, weekdays and hour day. So, load behavior pattern and determination of its value is of great importance. In this paper, a method is proposed to measure substation values using registers. Then, the method to obtain consumption pattern curve is presented. After that, a strategy is discussed to determine the peak and minimum values of load curve using normalized energy value consumed by customers. This method is implemented on a sample distribution system of Ashtian town in Iran. Obtained results verify the capability of the method to estimate load consumption value in each hour of a day.Keywords
Computer Modeling, Consumption Demand, Consumption Pattern, Distribution Systems, Load Duration CurveFull Text
References
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