![International Journal of Applied Power Engineering (IJAPE)
Vol. 2, No. 1, April 2013, pp. 39~44
ISSN: 2252-8792 39
Journal homepage: http://iaesjournal.com/online/index.php/IJAPE
Improving Electrical Power Grid of Jordan and Control the
Voltage of Wind Turbines Using Smart Grid Techniques
Nadeem T. Ahmad
Departement of Electrical Power and Machines Engineering,Yarmouk University
Article Info ABSTRACT
Article history:
Received Nov 12, 2012
Revised Jan 24, 2013
Accepted Feb 5, 2013
In this paper, we improved the national grid of Jordan country by
adding a renewable resources specifically a wind turbines generation
unites distributed on different places in Jordan to compensate the
losses of the power in Jordan and to dispense with using the
generation of fuel and gas by representing the national grid of Jordan
in ETAB simulator and we solved the voltage problems of wind
turbines using a new mythology using smart grid techniques.Keyword:
EATAB
Sensitivity theory
Smart grid
Voltage control
Wind turbines Copyright © 2013 Institute of Advanced Engineering and Science.
All rights reserved.
Corresponding Author:
Nadeem Tarq Ahmad,
Departement of Electrical Power & Machines Engineering Department,
Hijjawi Faculty For Engineering College- Yarmouk University,
Jordan – Irbid city – Yarmouk University, P.O:21163.
Email: nadeem_tfa@ieee.org
1. INTRODUCTION
The Jordanian electrical system now has a problems because the load rising and the generation units
in future will not cover all the loads so it needs another extension sources like renewable energy resources
(wind turbines, solar cells) to cover the loads and does not depends on the generation by fuel and gas because
Jordan it has not in sources for fuel and gas. We were studied the Jordanian power grid to solve the
generation problems and to improve the controlling of the system using a new techniques like Smart Grid
technique and to connect all system together to be system controlled by one central control station and the
system depends to each other.
ETAB simulator is the best software to represents real electrical power grid system and to study all
case studies of electrical power applications (balanced load flow, unbalanced load flow, arc flash, transient
stability and harmonics study) [1] , when we was represents the Jordanian power grid in ETAB simulator it
was given results closed to the real results.
Due to the development of Distributed Generation (DG), which is installed in Medium-Voltage
Distribution Networks (MVDNs) such as generators based on renewable energy (e.g., wind energy or solar
energy), voltage control is currently a very important issue[2].The voltage of MVDNs is now regulated
acting only on the On-Load Tap Changer (OLTC) of the HV/MV transformer [3]. The OLTC control is
typically based on the compound technique, and this method does not guarantee the correct voltage value in
the network nodes when the generators deliver their power [4],[5].When a generator injects power in the
network, the voltage tends to rise.
In HV networks this phenomenon happens mainly when reactive power is injected, because the
resistance is negligible if compared with the inductive Reactance [6]. Instead in MVDNs the resistance is not
negligible and the result is that an injection of active Power also increases the voltage.Instead in MVDNs the](https://image.slidesharecdn.com/1301-946-1-pb-201203042132/85/Improving-Electrical-Power-Grid-of-Jordan-and-Control-the-Voltage-of-Wind-Turbines-Using-Smart-Grid-Techniques-1-320.jpg)
![IJAPE ISSN: 2252-8792
Improving Electrical Power Grid of Jordan and Control the Voltage (Nadeem T. Ahmad)
41
b. Transformer Information In Jordanian System
It is included by MVA Capacity, the voltages in primary and secondary sides of the transformers
and impedance % of the transformers see Table 2.
Table 2.Examples for transformers in Jordan
c. Transmission lines Information of Jordanian system:
It consists of the length of line, resistance and reactance for each line.
d. Load Information of Jordanian system:
It consists of the MVA for each feeder and the voltage a cross the feeder.
e. Busbars Information of Jordanian system:
Included by the voltage a cross each bus and the rated current can flows the bus.
3. DESIGN WIND TURBINES GENERATION UNITS IN ETAB
ETAB simulator designs the wind turbines and allows inputting the real data of wind generation
(i.e., average speed).
In the improvements of Jordanian power network to give enough electrical power to cover the
demands and to compensate the losses by adding wind generation units each unit included groups of winds
turbine and each wind turbine rated by 2 MVA connected to 0.4 kV bus with power factor equal to 80% and
each two winds turbine connected to one transformer rated by 5 MVA See Figure.2.
4. PERFORMANCE OF WIND TURBINES IN JORDAN
The wind turbine is measured by the power curve and CP curves. The power curve is the relation
between the power out and the average speed of the wind turbine see Figure.3, it is a wind turbine has 10 m/s
average speed and produces 0.676 MW.
The coefficient of power is the most important variable in wind turbine aerodynamics.Buckingham
π theorem can be applied to show that non-dimensional variable for power is given by the equation below.
This equation is similar to efficiency, so values between 0 and less than one are typical. However this is not
the exactly the same as efficiency so in practice some turbines can exhibit greater than unity power
coefficients. In these circumstances one cannot conclude the first law of thermodynamics is violated because
this is not an efficiency term by the strict definition of efficiency [7].
(1)
S/S
Name
Trans No
Voltage
Transformation kV
Capacity
Imp. %
From To MVA
Zerqa
STR1 132 33 15/30 9.7
STR2 132 33 20/30 9.9
STR3 132 33 18/30 10.25
STR4 132 33 26/40 10.17
Marqa
STR1 132 33 27/45 12.1
STR2 132 33 42/63 12.8
STR3 132 33 54/80 12.6
Abdali
STR1 132 33 40 10.74
STR2 132 33 40 10.78
STR3 132 33 40 12.9
Bayader
Old
STR1 132 33 22.5/45 12.4
STR2 132 33 22.5/45 12.1
STR3 132 33 22.5/45 12.84](https://image.slidesharecdn.com/1301-946-1-pb-201203042132/85/Improving-Electrical-Power-Grid-of-Jordan-and-Control-the-Voltage-of-Wind-Turbines-Using-Smart-Grid-Techniques-3-320.jpg)
![ ISSN: 2252-8792
IJAPE Vol. 2, No. 1, April 2013 : 39 – 44
42
Figure.2.wind turbine generation units
Where: is the coefficient of power is the air density, A is the area of the wind turbine, and
finally V is the wind speed see Figure.4.chosen each year by the Society’s Awards Committee.
Figure.3.Power curve of wind TurbineFigure.4.CP curve of Wind Turbine
Figure.5.Wind Profile resulted from simulation in ETAB
5. MAPPING OF SINGLE LINE DIAGRAM
To analyze the power system within the context of complex network theory, the first step is to
model the system as a graph [8]. From the perspective of network theory, a graph is an abstract representation
of a set of objects, called nodes or vertices, where some pairs of the objects are connected via links or edges.
The power system of today is a complex interconnected network which can be subdivided into four major
parts of generation, transmission, distribution and loads [9]. To portray the assemblage of various
components of power system, engineers use single-line or one-line diagram which provides significant
information about the system in a Concise form [10].The principle of mapping is described as follows:
a) All impedances between any bus and neutral are neglected,
b) All transmission and/or distribution lines are modeled except for the local lines in the plants and
substations,
c) All transmission lines and transformers are modeled as weighted lines, the weight is equal to the
admittance between the buses, and](https://image.slidesharecdn.com/1301-946-1-pb-201203042132/85/Improving-Electrical-Power-Grid-of-Jordan-and-Control-the-Voltage-of-Wind-Turbines-Using-Smart-Grid-Techniques-4-320.jpg)
![IJAPE ISSN: 2252-8792
Improving Electrical Power Grid of Jordan and Control the Voltage (Nadeem T. Ahmad)
43
d) Parallel lines between buses are modeled as an equivalent single line. convert single line diagram Figure.7
to nodes diagram Figure.6.
Figure.6.Physical topology graph of IEEE-30 bus systemFigure.7.the IEEE-30 bus system.
6. VOLTAGE CONTROL OF WIND TURBINES USING SMART GRID COMPONENTS
OBTAINED WITH SENSITIVITY THEORY
If the generators are able to control the injected or absorbed reactive power, the network voltage
profiles can be modified by acting on the reactive powers. It is clear that each controllable generator needs a
smart grid components like (GRTU) Generator Remote Terminal Unit that is connected to a central control
system to set the generator reactive power and (GCC) Generator control Center [3,4].
When the voltage in the ith node exceeds max V , the GRTU installed in the same node sends the
signal “Voltage Threshold Overall” (VTO) to the GCC using a communication channel. The GCC then
selects the generator in the jth node that has the maximum influence on the voltage of the ith node, the “Best
Generator” (BG), and switches it to RPA (the reactive power absorption mode). Therefore, the voltage in the
ith node tends to decrease. The problem is thus to determine the best generator and ensure that the GCC
chooses it. In this work, a sensitivity- based method is proposed to select the BG see Figure.8.
Figure.8.voltage controlled by GCC and GRTU
Let us suppose that load Ld suddenly decreases its power (for example, due to a trip) and V2 exceed Vmax .
The GRTUs of G2 send the signal VTO to the GCC that must choose the BG using the sensitivity method.
Assuming that the BG is G1, it will be switched by the GCC in the RPA mode; therefore, the reactive power
absorbed by G1 becomes Q1=P1tan φ1. As explained in the following, the GCC must know the reactive
power that each controllable generator can absorb in order to choose the BG. We suppose that this
information is acquired the GCC using a polling technique on each GRTU. See Fig.9.
It will choose the best generation by choose the best absolute value of sensitivity factor so by ETAB
the result for the best generation to reduce the voltage of node 5 is
ts5,4 = -164.53 V](https://image.slidesharecdn.com/1301-946-1-pb-201203042132/85/Improving-Electrical-Power-Grid-of-Jordan-and-Control-the-Voltage-of-Wind-Turbines-Using-Smart-Grid-Techniques-5-320.jpg)
![ ISSN: 2252-8792
IJAPE Vol. 2, No. 1, April 2013 : 39 – 44
44
Fig.9.Medium voltage distribution network
7. CONCLUSION
The proposed sensitivity method allows the voltage within network acting on single generators to be
regulated by choosing the most effective generator on the controllednode (i.e., the Best Generator). This is a
very important feature in grids that have distributed generation (e.g., in a Smart Grid context). The proposed
method uses a topological approach. Moreover, the sensitivity table can be constructed automatically. In
addition to the BG choice, the proposed method also evaluates the voltage in all network nodes after a
reactive power variation.
After choosing the BG, but before its commutation during RPA, it is possible to verify that the
voltage variation in the other nodes is tolerable for the connected loads.Moreover, it is necessary to verify
that the threshold settings of the voltage relay installed in the same nodes.
ACKNOWLEDGEMENTS
The authors would like to thank Dr.Moahmmad AL-Zoubi for his support and they would thank the
NEPCO company for given data for them.their financial support and offering the software to completethis
work.
REFERENCES
[1] http://etap.com/electrical-power-system-software/new-etap-software.htm.
[2] Morris Brenna1, Ettore De Berardinis, Federica Foiadelli1, Gianluca Sapienza3, Dario Zaninelli1. Voltage Control
in Smart Grids. doi:10.4236/jemaa.2010.28062 Published Online August 2010
[3] R. Marconato. Electric Power Systems, Vol. 2, CEI, Milano, 2008.
[4] P. Kundur. Power System Stability and Control, McGraw- Hill, New York, 1994.
[5] Y. Rosales Hernandez and T. Hiyama. “Distance Measure Based Rules for Voltage Regulation with Loss
Reduction”, Journal of Electromagnetic Analysis and Applications (JEMAA), Vol/Issue: 1(2). Pp. 85-91, 2009.
[6] F. Saccomanno. Electric Power Systems, Wiley-Interscience IEEE Press, Piscataway, 2003.
[7] Rajeev Verma, Student Member, IEEE, Domitilla Del Vecchio, and Hosam K. Fathy. “Development of a Scaled
Vehicle With Longitudinal Dynamics of an HMMWV for an ITS Testbed", IEEE/ASME TRANSACTIONS ON
MECHATRONICS, Vol/Issue: 13(1), 2008.
[8] G. Chen, Z. Y. Dong, D. J. Hill, and G. H. Zhang. “An improved model for structural vulnerability analysis of
power networks”, Physica A: Statistical Mechanics and its Applications, Vol. 388. Pp. 4259-4266, 2009.
[9] H. Saadat. Power Systems Analysis, McGraw-Hill, 2002.
[10] J. Grainger and W. Stevenson. Power System Analysis, McGraw-Hill, 1994.
BIOGRAPHY OF AUTHOR
Nadeem T. Ahmad B.S. student in Electrical Power And Machines Engineering ,from
Yarmouk University – Hijjawi Faculty For Engineering Technology – Electrical Power And
Machines Engineering Dept. . He currently doing a research papers about renwable energy
resources and smart grids , MR. Nadeem T. Ahmed is a past chair for IEEE Yarmouk
University Student Branch for two years, He participate in all conferences for IEEE in Jordan,
He interested in Machines,Etab simulator , smart power grids improvement of power grids.](https://image.slidesharecdn.com/1301-946-1-pb-201203042132/85/Improving-Electrical-Power-Grid-of-Jordan-and-Control-the-Voltage-of-Wind-Turbines-Using-Smart-Grid-Techniques-6-320.jpg)
Improving Electrical Power Grid of Jordan and Control the Voltage of Wind Turbines Using Smart Grid Techniques
- 1. International Journal of Applied Power Engineering (IJAPE) Vol. 2, No. 1, April 2013, pp. 39~44 ISSN: 2252-8792 39 Journal homepage: http://iaesjournal.com/online/index.php/IJAPE Improving Electrical Power Grid of Jordan and Control the Voltage of Wind Turbines Using Smart Grid Techniques Nadeem T. Ahmad Departement of Electrical Power and Machines Engineering,Yarmouk University Article Info ABSTRACT Article history: Received Nov 12, 2012 Revised Jan 24, 2013 Accepted Feb 5, 2013 In this paper, we improved the national grid of Jordan country by adding a renewable resources specifically a wind turbines generation unites distributed on different places in Jordan to compensate the losses of the power in Jordan and to dispense with using the generation of fuel and gas by representing the national grid of Jordan in ETAB simulator and we solved the voltage problems of wind turbines using a new mythology using smart grid techniques.Keyword: EATAB Sensitivity theory Smart grid Voltage control Wind turbines Copyright © 2013 Institute of Advanced Engineering and Science. All rights reserved. Corresponding Author: Nadeem Tarq Ahmad, Departement of Electrical Power & Machines Engineering Department, Hijjawi Faculty For Engineering College- Yarmouk University, Jordan – Irbid city – Yarmouk University, P.O:21163. Email: [email protected] 1. INTRODUCTION The Jordanian electrical system now has a problems because the load rising and the generation units in future will not cover all the loads so it needs another extension sources like renewable energy resources (wind turbines, solar cells) to cover the loads and does not depends on the generation by fuel and gas because Jordan it has not in sources for fuel and gas. We were studied the Jordanian power grid to solve the generation problems and to improve the controlling of the system using a new techniques like Smart Grid technique and to connect all system together to be system controlled by one central control station and the system depends to each other. ETAB simulator is the best software to represents real electrical power grid system and to study all case studies of electrical power applications (balanced load flow, unbalanced load flow, arc flash, transient stability and harmonics study) [1] , when we was represents the Jordanian power grid in ETAB simulator it was given results closed to the real results. Due to the development of Distributed Generation (DG), which is installed in Medium-Voltage Distribution Networks (MVDNs) such as generators based on renewable energy (e.g., wind energy or solar energy), voltage control is currently a very important issue[2].The voltage of MVDNs is now regulated acting only on the On-Load Tap Changer (OLTC) of the HV/MV transformer [3]. The OLTC control is typically based on the compound technique, and this method does not guarantee the correct voltage value in the network nodes when the generators deliver their power [4],[5].When a generator injects power in the network, the voltage tends to rise. In HV networks this phenomenon happens mainly when reactive power is injected, because the resistance is negligible if compared with the inductive Reactance [6]. Instead in MVDNs the resistance is not negligible and the result is that an injection of active Power also increases the voltage.Instead in MVDNs the
- 2. ISSN: 2252-8792 IJAPE Vol. 2, No. 1, April 2013 : 39 – 44 40 resistance is not negligible and the result is that an injection of active power also increases the voltage. When a generator injects power, the voltage rises in all network nodes, but some nodes are mainly influenced than others by the power injection. This influence can be obtained using a Sensitivity method using Smart Grid techniques. In this paper representation of Electrical Power Grid of Jordan by ETAB simulator and improving the power grid by adding a distribution generation units (wind turbines) and solve the problems of rising the voltage in wind turbines due to variable power output using Sensitivity method in Smart Grid techniques. 2. REPRESENTATION OF ELECTRICAL POWER GRID OF JORDAN USING ETAB SIMULATOR To represent any electrical power grid it will be represented in single line diagram and it needs to details and all parameters to design electrical power grid those parameters are: 2.1. Generation information 2.2. Transformers information 2.3. Transmission Lines information 2.4. Load information 2.5. Busbars information See Fig.1 it is a schematic diagram for electrical power grid of Jordan it represents the generation station, transformation stations and distribution stations. Figure. 1.Single Line diagram of Jordanian network a. Generation Information Of Gordanian System The generation information included by rated power, voltage in generator side, power factor of the generator andtransient Reactance xd '. see Table 1. Table 1 . Examples for generations Units Capacity in Jordan Unit Name S V P.F Xd' (MVA) (kV) (PU) HTPS Gen1 38.82 13.8 .85 .17 HTPS Gen2 38.82 13.8 .85 .17 HTPS Gen3 38.82 13.8 .85 .17 HTPS Gen4 77.65 13.8 .85 .186 HTPS Gen5 77.65 13.8 .85 .186 HTPS Gen6 77.65 13.8 .85 .186 HTPS Gen7 77.65 13.8 .85 .186 ATPS Gen1 160 15 .85 .165 ATPS Gen2 160 15 .85 .165 ATPS Gen3 160 15 .85 .165 ATPS Gen4 160 15 .85 .165 ATPS Gen5 160 15 .85 .165
- 3. IJAPE ISSN: 2252-8792 Improving Electrical Power Grid of Jordan and Control the Voltage (Nadeem T. Ahmad) 41 b. Transformer Information In Jordanian System It is included by MVA Capacity, the voltages in primary and secondary sides of the transformers and impedance % of the transformers see Table 2. Table 2.Examples for transformers in Jordan c. Transmission lines Information of Jordanian system: It consists of the length of line, resistance and reactance for each line. d. Load Information of Jordanian system: It consists of the MVA for each feeder and the voltage a cross the feeder. e. Busbars Information of Jordanian system: Included by the voltage a cross each bus and the rated current can flows the bus. 3. DESIGN WIND TURBINES GENERATION UNITS IN ETAB ETAB simulator designs the wind turbines and allows inputting the real data of wind generation (i.e., average speed). In the improvements of Jordanian power network to give enough electrical power to cover the demands and to compensate the losses by adding wind generation units each unit included groups of winds turbine and each wind turbine rated by 2 MVA connected to 0.4 kV bus with power factor equal to 80% and each two winds turbine connected to one transformer rated by 5 MVA See Figure.2. 4. PERFORMANCE OF WIND TURBINES IN JORDAN The wind turbine is measured by the power curve and CP curves. The power curve is the relation between the power out and the average speed of the wind turbine see Figure.3, it is a wind turbine has 10 m/s average speed and produces 0.676 MW. The coefficient of power is the most important variable in wind turbine aerodynamics.Buckingham π theorem can be applied to show that non-dimensional variable for power is given by the equation below. This equation is similar to efficiency, so values between 0 and less than one are typical. However this is not the exactly the same as efficiency so in practice some turbines can exhibit greater than unity power coefficients. In these circumstances one cannot conclude the first law of thermodynamics is violated because this is not an efficiency term by the strict definition of efficiency [7]. (1) S/S Name Trans No Voltage Transformation kV Capacity Imp. % From To MVA Zerqa STR1 132 33 15/30 9.7 STR2 132 33 20/30 9.9 STR3 132 33 18/30 10.25 STR4 132 33 26/40 10.17 Marqa STR1 132 33 27/45 12.1 STR2 132 33 42/63 12.8 STR3 132 33 54/80 12.6 Abdali STR1 132 33 40 10.74 STR2 132 33 40 10.78 STR3 132 33 40 12.9 Bayader Old STR1 132 33 22.5/45 12.4 STR2 132 33 22.5/45 12.1 STR3 132 33 22.5/45 12.84
- 4. ISSN: 2252-8792 IJAPE Vol. 2, No. 1, April 2013 : 39 – 44 42 Figure.2.wind turbine generation units Where: is the coefficient of power is the air density, A is the area of the wind turbine, and finally V is the wind speed see Figure.4.chosen each year by the Society’s Awards Committee. Figure.3.Power curve of wind TurbineFigure.4.CP curve of Wind Turbine Figure.5.Wind Profile resulted from simulation in ETAB 5. MAPPING OF SINGLE LINE DIAGRAM To analyze the power system within the context of complex network theory, the first step is to model the system as a graph [8]. From the perspective of network theory, a graph is an abstract representation of a set of objects, called nodes or vertices, where some pairs of the objects are connected via links or edges. The power system of today is a complex interconnected network which can be subdivided into four major parts of generation, transmission, distribution and loads [9]. To portray the assemblage of various components of power system, engineers use single-line or one-line diagram which provides significant information about the system in a Concise form [10].The principle of mapping is described as follows: a) All impedances between any bus and neutral are neglected, b) All transmission and/or distribution lines are modeled except for the local lines in the plants and substations, c) All transmission lines and transformers are modeled as weighted lines, the weight is equal to the admittance between the buses, and
- 5. IJAPE ISSN: 2252-8792 Improving Electrical Power Grid of Jordan and Control the Voltage (Nadeem T. Ahmad) 43 d) Parallel lines between buses are modeled as an equivalent single line. convert single line diagram Figure.7 to nodes diagram Figure.6. Figure.6.Physical topology graph of IEEE-30 bus systemFigure.7.the IEEE-30 bus system. 6. VOLTAGE CONTROL OF WIND TURBINES USING SMART GRID COMPONENTS OBTAINED WITH SENSITIVITY THEORY If the generators are able to control the injected or absorbed reactive power, the network voltage profiles can be modified by acting on the reactive powers. It is clear that each controllable generator needs a smart grid components like (GRTU) Generator Remote Terminal Unit that is connected to a central control system to set the generator reactive power and (GCC) Generator control Center [3,4]. When the voltage in the ith node exceeds max V , the GRTU installed in the same node sends the signal “Voltage Threshold Overall” (VTO) to the GCC using a communication channel. The GCC then selects the generator in the jth node that has the maximum influence on the voltage of the ith node, the “Best Generator” (BG), and switches it to RPA (the reactive power absorption mode). Therefore, the voltage in the ith node tends to decrease. The problem is thus to determine the best generator and ensure that the GCC chooses it. In this work, a sensitivity- based method is proposed to select the BG see Figure.8. Figure.8.voltage controlled by GCC and GRTU Let us suppose that load Ld suddenly decreases its power (for example, due to a trip) and V2 exceed Vmax . The GRTUs of G2 send the signal VTO to the GCC that must choose the BG using the sensitivity method. Assuming that the BG is G1, it will be switched by the GCC in the RPA mode; therefore, the reactive power absorbed by G1 becomes Q1=P1tan φ1. As explained in the following, the GCC must know the reactive power that each controllable generator can absorb in order to choose the BG. We suppose that this information is acquired the GCC using a polling technique on each GRTU. See Fig.9. It will choose the best generation by choose the best absolute value of sensitivity factor so by ETAB the result for the best generation to reduce the voltage of node 5 is ts5,4 = -164.53 V
- 6. ISSN: 2252-8792 IJAPE Vol. 2, No. 1, April 2013 : 39 – 44 44 Fig.9.Medium voltage distribution network 7. CONCLUSION The proposed sensitivity method allows the voltage within network acting on single generators to be regulated by choosing the most effective generator on the controllednode (i.e., the Best Generator). This is a very important feature in grids that have distributed generation (e.g., in a Smart Grid context). The proposed method uses a topological approach. Moreover, the sensitivity table can be constructed automatically. In addition to the BG choice, the proposed method also evaluates the voltage in all network nodes after a reactive power variation. After choosing the BG, but before its commutation during RPA, it is possible to verify that the voltage variation in the other nodes is tolerable for the connected loads.Moreover, it is necessary to verify that the threshold settings of the voltage relay installed in the same nodes. ACKNOWLEDGEMENTS The authors would like to thank Dr.Moahmmad AL-Zoubi for his support and they would thank the NEPCO company for given data for them.their financial support and offering the software to completethis work. REFERENCES [1] http://etap.com/electrical-power-system-software/new-etap-software.htm. [2] Morris Brenna1, Ettore De Berardinis, Federica Foiadelli1, Gianluca Sapienza3, Dario Zaninelli1. Voltage Control in Smart Grids. doi:10.4236/jemaa.2010.28062 Published Online August 2010 [3] R. Marconato. Electric Power Systems, Vol. 2, CEI, Milano, 2008. [4] P. Kundur. Power System Stability and Control, McGraw- Hill, New York, 1994. [5] Y. Rosales Hernandez and T. Hiyama. “Distance Measure Based Rules for Voltage Regulation with Loss Reduction”, Journal of Electromagnetic Analysis and Applications (JEMAA), Vol/Issue: 1(2). Pp. 85-91, 2009. [6] F. Saccomanno. Electric Power Systems, Wiley-Interscience IEEE Press, Piscataway, 2003. [7] Rajeev Verma, Student Member, IEEE, Domitilla Del Vecchio, and Hosam K. Fathy. “Development of a Scaled Vehicle With Longitudinal Dynamics of an HMMWV for an ITS Testbed", IEEE/ASME TRANSACTIONS ON MECHATRONICS, Vol/Issue: 13(1), 2008. [8] G. Chen, Z. Y. Dong, D. J. Hill, and G. H. Zhang. “An improved model for structural vulnerability analysis of power networks”, Physica A: Statistical Mechanics and its Applications, Vol. 388. Pp. 4259-4266, 2009. [9] H. Saadat. Power Systems Analysis, McGraw-Hill, 2002. [10] J. Grainger and W. Stevenson. Power System Analysis, McGraw-Hill, 1994. BIOGRAPHY OF AUTHOR Nadeem T. Ahmad B.S. student in Electrical Power And Machines Engineering ,from Yarmouk University – Hijjawi Faculty For Engineering Technology – Electrical Power And Machines Engineering Dept. . He currently doing a research papers about renwable energy resources and smart grids , MR. Nadeem T. Ahmed is a past chair for IEEE Yarmouk University Student Branch for two years, He participate in all conferences for IEEE in Jordan, He interested in Machines,Etab simulator , smart power grids improvement of power grids.