American Journal of Electrical and Electronic Engineering

ISSN (Print): 2328-7365

ISSN (Online): 2328-7357

Editor-in-Chief: Naima kaabouch

Website: http://www.sciepub.com/journal/AJEEE

   

Article

Analytical Review of Power Flow Tracing in Deregulated Power System

1Department of Electrical Engineering, Veer Surendra Sai University of Technology (VSSUT), Burla, India

2Department of Electrical Engineering, Bhadrak Institute of Engineering and Technology, Bhadrak, India


American Journal of Electrical and Electronic Engineering. 2016, 4(3), 92-101
doi: 10.12691/ajeee-4-3-4
Copyright © 2016 Science and Education Publishing

Cite this paper:
P. K. Hota, A. P. Naik. Analytical Review of Power Flow Tracing in Deregulated Power System. American Journal of Electrical and Electronic Engineering. 2016; 4(3):92-101. doi: 10.12691/ajeee-4-3-4.

Correspondence to: P.  K. Hota, Department of Electrical Engineering, Veer Surendra Sai University of Technology (VSSUT), Burla, India. Email: p_hota@rediffmail.com

Abstract

Electric Power starts flowing when there is a Source and Sink gets connected. Transmission corridor facilitates that power to flow. The problem arises in the analysis of individual power through a common transmission corridor of a larger system which is called power flow tracing. In the pre-deregulated system, due to the monopolistic nature of governance, the consumer was nothing to say about the tariff or choosing its service provider. But in the free-market or deregulated market system, the price to be charged must be based on fair and transparent manner. So analysis of individual customer’s power in a common supply corridor is a major contribution towards the fair and transparent analysis of price. Efficient power flow tracing would make it possible to charge the generators and/or consumers on the basis of actual transmission facility used. This paper deals with the detailed procedure for obtaining active and reactive power tracing for the actual active and reactive power transmitted through a common corridor between generators and loads. Initially, from the Newton-Raphson based load flows, the line flows are computed and then the multiplying factors of the lossy lines are calculated using proportional sharing method. Finally, based on the multiplying factors, the contributions of each line to concerned loads are obtained for both active and reactive power flow tracing. The method is used elaborately in a Six-bus system and subsequently applied to standard IEEE-14 and IEEE-30 Bus test systems and the results are presented.

Keywords

References

[1]  J.Yang, M.D. Anderson, “Tracing the flow of power in transmission networks for use-of-transmission-system changes and congestion management”, Proceedings of IEEE PES, Winter meeting, Vol.1, January 31-Feb 4, 1999, pp.399-405.
 
[2]  A.R. Shirani, H. Siahkali, “Traceable flow method in determination of congestion cost assignment in open access power system network”, Proceedings of IEEE PES, Transmission and Distribution Conference, Yokahama, Japan, October 2002, pp.734-738.
 
[3]  A.G. Exposito, J.M.R. Santos, T.G. Garcia, E.R. Velasco, “Fair allocation of transmission power losses”, IEEE Trans. on Power Syst., Vol.15, February-2000, pp.184-188.
 
[4]  G. Strbac, D. Kirschen, S. Ahmed, “Allocating transmission system usage on the basis of traceable contributions of generators and loads to flows”, IEEE Trans. on Power Syst., Vol.13, May-1998, pp.527-534.
 
[5]  D. Kirschen, G. Strbac, “Tracing active and reactive power between generators and loads using real and imaginary currents”, IEEE Trans. on Power Syst., Vol.14, November- 1999, pp.1312-1319.
 
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[6]  A.J. Canejo, F.D. Galiana, I. Kockar, “Z-buss loss allocation”, IEEE Trans. on Power Syst., Vol.16, February-2001, pp.105-110.
 
[7]  A.M. Leite, J.G. Carvalho Costa, “Transmission loss allocation. Part-I: Single energy market”, IEEE Trans. on Power Syst., Vol.18, November-2003, pp.1389-1394.
 
[8]  A. Canejo, N. Alguacil, G.F. Ruiz,, “Allocation of the cost of transmission losses using a radial equivalent network”, IEEE Trans. on Power Syst., Vol.18, November-2003, pp.1353-1358.
 
[9]  A.J. Canejo, J.M. Arroyo, N. Alguacil, A.L. Guijarro, “Transmission loss allocation: a comparison of different practical algorithms”, IEEE Trans. on Power Syst., Vol.17, August-2002, pp.571-576.
 
[10]  G. Gross, S. Tao, “A physical-flow-based approach framework”, IEEE Trans. on Power Syst., Vol.15, No.2, May-2000, pp.631-637.
 
[11]  A.M. Leite, J.G. Carvalho Costa, “Transmission loss allocation. Part-II: Single energy market”, IEEE Trans. on Power Syst., Vol.18, November-2003, pp.1395-1401.
 
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Article

A Simple Current Control Strategy for Single-Stage Grid Connected Three-Phase PV Inverter

1Department of Electrical Engineering, Veer Surendra Sai University of Technology, Burla, India

2School of Electrical Engineering, KIIT University, Bhubaneswar, India


American Journal of Electrical and Electronic Engineering. 2016, 4(4), 102-109
doi: 10.12691/ajeee-4-4-1
Copyright © 2016 Science and Education Publishing

Cite this paper:
P. K. Hota, Babita Panda, Bhagabat Panda. A Simple Current Control Strategy for Single-Stage Grid Connected Three-Phase PV Inverter. American Journal of Electrical and Electronic Engineering. 2016; 4(4):102-109. doi: 10.12691/ajeee-4-4-1.

Correspondence to: P.  K. Hota, Department of Electrical Engineering, Veer Surendra Sai University of Technology, Burla, India. Email: p_hota@gmail.com

Abstract

This paper presents a new simple method of current control strategy of grid connected PV system. As the solar irradiation is a nonlinear quantity, so the connection of PV system with the grid is a difficult task. The objective of this work is to develop a model of the photovoltaic system with MPPT connected to 11KV grid by implementing new control technique so that maximum active power transfer from PV inverter to grid can be taken place without injection of harmonics. This paper also demonstrates the dynamic model of single-stage three-phase grid connected inverter. Here, for simplification the PV system is realized as a constant DC voltage source by using maximum power point tracking (MPPT) and boost converter. A current control strategy with pulse width modulation (PWM) technique is proposed to provide pulse for voltage-source inverter (VSI). The analysis and control design of grid connected PV inverter using PI control technique is done in synchronous d-q rotating reference frame to achieve maximum output voltage response and active power. The considered system consists of a VSI, 3-Φ filter, a control system, a distribution network, load and grid. As PV inverter should inject only active power, so reactive power injected to the grid is made zero with the help of this control technique. There after the final model is simulated by using MATLAB/SIMULINK and different output waveforms are analyzed for three different conditions.

Keywords

References

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Article

A Study on Overvoltage Distribution Across the High Voltage Winding of an Electric Power Transformer

1“POLITEHNICA” University of Bucharest, Bucharest, Romania

2Northern Alberta Institute of Technology, Edmonton, Canada

3Eaton Corporation, Edmonton, Canada

4GE’s Grid Software Solutions, Technical Training Institute, Redmond, Washington, USA


American Journal of Electrical and Electronic Engineering. 2016, 4(4), 110-122
doi: 10.12691/ajeee-4-4-2
Copyright © 2016 Science and Education Publishing

Cite this paper:
Gloria Ciumbulea, Lavinia Iordache (Bobaru), Sorin Deleanu, Mihai Iordache, Neculai Galan, Scott Basinger, Gregory Von Lipinski, David Carpenter. A Study on Overvoltage Distribution Across the High Voltage Winding of an Electric Power Transformer. American Journal of Electrical and Electronic Engineering. 2016; 4(4):110-122. doi: 10.12691/ajeee-4-4-2.

Correspondence to: Sorin  Deleanu, Northern Alberta Institute of Technology, Edmonton, Canada. Email: sorind@nait.ca, sorin1365@gmail.com

Abstract

The main objective of this paper is to represent effects of overvoltage on a transformer winding by analysis and modelling with special attention given to the voltage distribution across the winding. The authors have considered both approaches in modelling the winding: windings with distributed electrical parameters, and secondly disk coils with concentrated parameters. All known models are assembled in a general model based upon distributed parameters, while the excitation voltages display sinusoidal variation in time (commutation) or step. Both induced and commutation voltages, applied across the transformer winding, will generate free oscillations which are analyzed further on. According to the model, the transformer’s windings are divided in several disk coils with concentrated known parameters. This results in a complete electrical network used for simulations. All simulations have been performed using the software package SYSEG (SYmbolic State Equation Generation). Using SYSEG package, from the state equations assembled in terms of the disk coils voltages, one can obtain the overvoltage across the transformer winding as function of time. If the frequency of the commutation voltage and the frequency of the free oscillations are in close range, then the voltage across the disk coils shows a non-uniform distribution. An important aspect of this paper is accounting for asymmetry of the transformer by modelling the reinforced insulation of the first turns of the disk coils of the transformer’s high voltage winding. This affects the value of the inter-turn capacitance of these coils, and is an aspect which is treated in our simulations.

Keywords

References

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