Master Thesis_Mostafa_Kamal

DEVELOPMENT OF A COMPREHENSIVE
BATTERY ENERGY STORAGE SYSTEM
MODEL FOR GRID ANALYSIS
1
MODEL FOR GRID ANALYSIS
APPLICATIONS
By:
Eng. Mostafa Kamal Salem
Under Supervision Of:
Prof. Dr.-Eng. Peter Zacharias
Prof. Dr.-Eng. Adel Khalil
Prof. Dr.-Eng. Amr Adly
Dr.-Eng. Stefan Kempen
19.03.2013

Acknowledgment
BatteryEnergyStorageSystemBESS
I would like to thank all the people who helped me in achieving this thesis. Very special thanks to my supervisors: Prof.
Dr. Adel Khalil, Prof. Dr. Peter Zacharias, and Prof. Dr. Amr Adly for their supervision and support. I would like to
thank the examining committee for their time. I would like to express my appreciation to AEG Power Solutions for giving
me the opportunity to work on my master thesis in the company with its quality service provisions. Special thanks to Dr.-
Ing Kempen, M.Sc.-Ing Ammar Salman, and Mr. John Kuhne for their support and guidance. Also, I would like to thank
the German Academic Exchange Service (DAAD) for supporting REMENA master program and for providing me the
financial and moral support. Special thanks to Ms. Anke Stahl and Ms. Janique Bikomo for supporting and care. I would
like to express my appreciation to the University of Kassel and Cairo University for hosting me in the master course.
2
like to express my appreciation to the University of Kassel and Cairo University for hosting me in the master course.
Special thanks to Prof. Adel Khalil, Prof. Sayed Kaseb, Prof. Dirk Dahlhaus, and Ms. Anke Aref for the support and
guidance during the whole program.

Outlines
1.Introduction
2.Methodology & Procedure
3. Review of Literature
Battery Types
Battery Models
4. Model in Power Factory
5. Simulations & Results
BESS TEST
2 Min.
1 Min.
2 Min.
4 Min.
8 Min.
3
BESS TEST
Public Grid with and without BESS
BESS with AEG Grid
BESS with PV
6. Conclusion
7. Future Recommendations
8.Summary
9. References
2 Min.
2 Min.
1 Min.

Motivation:
The major challenge now days is to store the excess energy from the renewable energy that
generated when demand is low, and reuse this energy in later time or in the high demand
times.
1. Introduction
4
Source: www.renewableenergyworld.com

Aim of work:
To Build comprehensive model of the battery energy storage system that simulates the real
reactions that happens inside the battery, and to be able to analyze different grid scenarios
using Power Factory DIgSILENT.
1. Introduction
5
Source: www.newavenergy.com

1. Introduction
Battery Energy Storage System is composed of a combination of electrical part and chemical part.
+ -
6
AEG Converter Lead Acid Battery
Brain of the
system
Figure (1): Battery Energy Storage System

1. Introduction
BESS Advantages:
1. Active power output/input (support grid frequency).
2. Reactive power output/input (voltage control).
3. Pure phase shift operation is possible.
4. Charge and discharge at any desired cosф.
7
Figure (2): PQ Characteristics for BESS [5]

2. Methodology & Procedure
Identify
The
Problem
Search for
Solutions
& Model
Run The
Model
8
Problem & Model
Model
Developing Battery
Model that Simulates the
Battery and Consider the
Temperature changes
during the operation.
Suitable model in Power
Factory DIgSILENT
Integrating The Model
with Different Grids and
Different Power Sources

2. Methodology & Procedure
The methodology used in this thesis depends in all available papers, journals, theses, books,
internet web sites, and magazines that related to the Lead Acid batteries and BESS, to collect
the most updated theoretical data in this area. Power Factory Support service provided this
thesis with the suitable Model. The available PV data in AEG Power Solutions Company were
used.
9

Batteries have been used a long time ago. Earthen containers were used as galvanic cells dating
from 250 BC have been found in Baghdad (Iraq). Alessandro Volta is the first person in the modern
times to build an actual battery in year 1800, then Mr. Michael Faraday derived the laws of
electrochemistry based on Volta’s work.
Battery Types:
Rechargeable
Alkaline
1.5 V CD/MD/MP3 players, toys, electronic games,
cameras, flash lights, remote controls, solar
Table (1): Battery Types [6]
10
Alkaline cameras, flash lights, remote controls, solar
lighting
NiMH 1.2 V Digital cameras, remote controlled racing toy cars
NiCd 1.2 V Power Tools
Li-ion 3.6-3.7 V Notebook computers, PDAs, mobile phones,
camcorders, digital cameras
Lead Acid 12 V Car starter battery, lift trucks, golf charts, marine,
standby power, UPS, solar lighting and renewable
energy storage

Lead acid battery is the cheapest and the most commercially used battery nowadays.
11
Figure (3): Comparison of Life Cycle Costs per Delivered kWh
for A Typical Peak- Shaving Application [8]

Battery Models:
1. Simple Model.
2. Advanced Model (Ceraolo Model).
12
Figure (4): Structure of the BESS In Power Factory [11]

1. Simple Model:
Impedance Z (S,SOC)
Current I
13
E (S,SOC)
Figure (6): Simple Equivalent Circuit for the
Lead Acid Battery [11]
Figure (5): Typical Discharge Profile of A Lead-Acid Battery [11]

2. Advanced Model (Ceraolo Model):
+
C1 in Farads
R1
R2
Ip,
R0
14
+
-
Em
Main Branch Parasitic Branch
Ip,
VPN
Figure (7): Ceraolo Battery Model Equivalent Circuit [14]
R1 = f (SOC)
R2 = f (I,SOC)
IP = f (θ)
Emo= f (SOC,θ)

2. Advanced Model (Ceraolo Model) during the operation:
15
Figure (9): Implemented Model [14]

4. Model in Power Factory
(Battery Capacity)
θ (t) = θinit +
C = f (I,θ)
16
Depth of Discharge
State of ChargeDepth of Discharge
Depth of Discharge =
f (Open Circuit Voltage (Ue))
Depth of Discharge = Q/ C
Ucell = Ue+Urs
State of Charge
C = f (I,θ)
Battery Outputs

4. Models in Power Factory
BESS Model Verification:
17
Figure (11): Frame of the BESS Controller In Power Factory [11]

Outlines
1.Introduction
2.Methodology & Procedure
Battery Types
Battery Models
BESS TEST
18
BESS TEST
Public Grid with and without BESS
BESS with AEG Grid
BESS with PV
6. Conclusion
8.Summary
9. References

BESS TEST:
19
Figure (12): Small Testing Grid for the BESS

EVENTS:
0,80
0,60
0,40
ActivePower(MW)
Load _Step
Load_1
2000,02000,02000,02000,02000,02000,0 [s]
0,40
0,20
0,00
-0,20
Load Step: Active Power in MW
Load_1: Active Power in MW
Load_Ramp: Active Power in MW
At 2000 sec.
20
1.50E+41.20E+49.00E+36.00E+33.00E+3-3.00E-1 [s]
0,20
0,00
-0,20
Load_Ramp: Active Power in MW
Time (seconds)
Load_Ramp
Load _Step
120 sec.
At 2000 sec.
Figure (13): Loads Active Power In MW

Results:
1,60
1,40
1,20
1,00
DIgSILENT
120,39118,45
1,30
1,20
1,10
1,00
G (coal): Active Power in MW
Transient due to the event
1,02
0,98
0,94
0,90
DIgSILENT
1,00
ActivePower(MW)
SOCUnitless
120 sec.
21
1.50E+41.20E+49.00E+36.00E+33.00E+3-3.00E-1 [s]
0,80
0,60
G (coal): Active Power in MW
Figure (15): Synchronous Generator Active Power In MW
1.50E+41.20E+49.00E+36.00E+33.00E+3-3.00E-1 [s]
0,86
0,82
Charging Control: SOC
Figure (14): The Battery State Of Charge
Time (seconds)Time (seconds)
At 2000 sec.

Public Grid with and without BESS:
1. External Grid without BESS:
2,10
1,90
1,70
DIgSILENT
ActiveCurrent(p.u.)
External Grid
1.62 p.u.
1.41 p.u.
22
Switch is
open
Figure (16): External Grid without the BESS
1.70E+41.36E+41.02E+46.80E+33.40E+3-3.00E-1 [s]
1,50
1,30
1,10
Breaker/Switch(1): Current, Magnitude/Terminal i in p.u.
Figure (17): External Grid Active Current
Time (seconds)
1.41 p.u.

2. External Grid with BESS:
2,15
1,90
1,65
ActiveCurrent(p.u.)
External Grid
Switch is
closed
1.49 p.u.
1.46 p.u.
23
Figure (18): External Grid with BESS
1.70E+41.36E+41.02E+46.80E+33.40E+3-3.00E-1 [s]
1,40
1,15
0,90
Breaker/Switch(1): Current, Magnitude/Terminal i in p.u.
Figure (19): External Grid Active Current
Time (seconds)
closed

2. External Grid with BESS :
1,03
0,98
0,93
DIgSILENT
1,00
SOCUnitless
0,60
0,40
0,20
DIgSILENT
ActiveCurrent(p.u.)
Battery
Discharging
Battery
Discharging
Can be damped using
inverter control
24
1.70E+41.36E+41.02E+46.80E+33.40E+3-3.00E-1 [s]
0,88
0,83
0,78
Figure (20): Battery State of Charge
Time (seconds)
1.70E+41.36E+41.02E+46.80E+33.40E+3-3.00E-1 [s]
0,00
-0,20
-0,40
Advanced Battery: I
Time (seconds)
Battery
Charging
Figure (21): Battery Output Current In p.u.
Battery
Charging
inverter control

BESS with AEG Grid:
25
Figure (22) AEG Grid with the BESS

BESS with AEG Grid :
1,02
1,00
0,98
DIgSILENT
1,00
0,75
0,50
1st Event at 300 sec.
End of battery
charging and the 4th
SOCUnitless
ActiveCurrent(p.u.)
Discharge
Idle mode
26
1.80E+41.44E+41.08E+47.20E+33.60E+3-3.00E-1 [s]
0,96
0,94
0,92
Charge Control: SOC
1.80E+41.44E+41.08E+47.20E+33.60E+3-3.00E-1 [s]
0,25
0,00
-0,25
Charge Control: id_ref_out
2nd and 3rd Event at
1500 sec.
charging and the 4th
eventat 15000 sec.
Time (seconds)
Time (seconds)
Charging
Figure (24): Battery State of ChargeFigure (23) Active Charging Current In p.u.

BESS with PV (off Grid):
27
Figure (25): Electric Grid with Synchronous Generator, BESS, and PV
System

Events:
0,40
0,30
0,20
ActivePower(MW)
300 sec.
1000 sec.
28
1440,01152,0863,96575,94287,92-0,1000 [s]
0,10
0,00
-0,10
Figure (26): Loads Active Power In MW
Time (seconds)
1000 sec.

2,00
1,50
DIgSILENT
Photovoltaic Data:
The data are taken for one day with one minute time span in AEG Power Solution
inWarstein Belecke, Germany.
ActiveCurrent(p.u.)
29
1440,01152,0863,96575,94287,92-0,1000 [s]
1,00
0,50
0,00
-0,50
Measurment: id_ref
Time (seconds)
Active
Figure (27): Photovoltaic Active Current In p.u.

0,21
0,18
0,15
ActivePower(MW)
0,99985
0,99960
0,99935
SOCUnitless
PV
production
increased
1000
300
sec.
30
1440,01152,0863,96575,94287,92-0,1000 [s]
0,12
0,09
0,06
G3 (coal): Active Power in MW
Figure (29): Generator Active Power in MW
Time (seconds)
1440,01152,0863,96575,94287,92-0,1000 [s]
0,99910
0,99885
0,99860
Time (seconds)
1000
sec.
Figure (28): Battery State of Charge
PV
production
decreased

6. Conclusion
31
Figure (31): Simple Battery Equivalent
Circuit
Figure (32): Advanced Battery
Equivalent Circuit

6. Conclusion
32
Figure (33): External Grid Active Current with and without BESS

7.1 PV DATA TAKEN EVERY SECOND.
7.2. CASE STUDY IN EGYPT.
7.3 INTEGRATION THE BATTERY LIFE TIME IN THE MODEL.
33

7.1 PV DATA TAKEN EVERY SECOND:
For more realistic results of the PV simulation, PV data are required to be entered to the system
which should be taken with a one second time span for one complete day.
34

7.2. CASE STUDY IN EGYPT:
El Gouna
Source: www.aegypten-berater.de
35
Figure (34): Egyptian Solar Map [21]
It is recommended to integrate BESS with the PV and another power source to be used in day time
or in emergency cases. As a recommendation for future work, the implementation of the analyzed
BESS can be studied including the sizing, energy yield, and economical evaluation of the plant in El
Gouna.
Figure (35): El Gouna Resort

7.3 INTEGRATION THE BATTERY LIFE TIME IN THE MODEL:






=
1000
.
. max nom
lifetime
Vq
DODFQ [16]
36
F Is the number of cycles to failure
DOD Is the depth of discharge [%]
qmax Is the maximum capacity of the battery [Ah]
Vnom Is the nominal voltage of the battery [V].
Where:

8. Summary
The main purpose of the study is to simulate the effect of the battery temperature, on the different
battery parameters and develop battery model that simulates the real reactions happens inside the
battery ,then integrate this model with different grids with different power sources.
37
Source: principlesofedu.wikispaces.com

9. References
1 Kenrik, V., 2012, Clean Power and Renewable Energy Growth in MENA Region, http://www.environmentalleader.com.
2 Goikoetxea1, A., Barrena1, J.A., Rodríguez, M.A., and Abad,G., March 2010, “Grid manager design using Battery Energy Storage
Systems in weak power systems with high penetration of wind energy“, Proceedings of the tenth International Conference on
Renewable Energies and Power Quality, Granada, Spain.
3 Kottick, D., Blau, M.,and Edelstein,D., 1993, Battery Energy Strorage for Frequency Regulation in an Island Power System, vol.8,
3rd edition, IEEE Transactions on Energy Conversion.
4 Tsang, M.W., and Sutanto,D., 1998, “Control Strategies to Damp Inter-Area Oscillations Using a Battery Energy Storage System”,
Department of Electrical Engineering, university of Hong Kong Polytechnic , Hung Hom, Hong Kong.
5 Electricity Storage Association web site, 2012, http://www.electricitystorage.org
38
5 Electricity Storage Association web site, 2012, http://www.electricitystorage.org
6 Hageman, S.C., 1993 “Simple PSpice models let you simulate common battery types”, EDN, Oct. 28, 1993, pp.117-132.
7 Barak, M. (Ed.), Dickinson, T., Falk, U.,Sudworth, J.L.,Thirsk, H.R., Tye F.L., 1980, Electrochemical Power Sources: Primary &
Secondary Batteries, IEE Energy Series 1, A. Wheaton &Co, Exeter.
8 Energiespeicher in Stromversorgungssystemen mit hohem Anteil erneuerbarer Energieträger“ VDE- Studie 2009.
9 Tammineedi,C., May2011, “Modelling Battery-Ultra-capacitor Hybrid Systems For Solar And Wind Applications”, The Graduate
School, University of Pennsylvania, Pennsylvania, USA.
10 Toyota Motors Sales, 2012, Automotive batteries with questions, http://www.autoshop101.com.

9. References
11 DIgSILENT PowerFactory Version 14.1 Battery Energy Storing Systems in PowerFactory. Application Manual Gomaringen, Germany,
May 2011.
12 Idlbi,B., 2012, “ Dynamic Simulation Of A PV-Diesel-Battery Hybird Plant For Off Grid Electricity Supply“, MSc. Thesis, Faculty of
Engineering Cairo University, Giza, Egypt, Faculty Of Electrical Engineering And Computer Science, Kassel, Germany, March, 2012.
13 Medora, N.K., and Kusko A., Sept. 2005 “Dynamic Battery Modeling of Lead-Acid Batteries using Manufacturers“, Proceedings of the
27th, Telecommunications Conference, Berlin, Germany.
14 Ceraolo, M., 2000,” New Dynamical Models of Lead–Acid Batteries, Department of Electrical Systems and Automation”, University of
Pisa, Pisa, Italy, IEEE Transections On Power Systems, VOL. 15, NO. 4, Nov. 2000.
15 Jackey, R.A., 2007, ”A Simple, Effective Lead-Acid Battery Modeling Process for Electrical System Component Selection”, The
MathWorks, Inc.
39
MathWorks, Inc.
16 Lambert T., Homer Energy Software, [Online], May 2005, tom@homerenergy@.com.
17 Grid Code, High and extra high voltage, E-ON Netz GmbH, Bayreuth, 1 April 2006.
18 DIgSILENT PowerFactory, Version 14.1, User’s Manual,Volume I, User’s Manual,Volume II, Edition 1, DIgSILENT GmbH, Gomaringen,
Germany, May 2011.
19
Jürgens, F., July 2012, “Modeling of a Micro grid at an industrial production site with a high percentage of regenerative electrical energy
and with innovative energy storage technologies“, BSc. Thesis, University of Wilhelmshaven, Wilhelmshaven, Germany.
20 Orascom Development Holding AG web site, 2008, www.orascomdh.com.
21 New and Renewable Energy Authority web site, 2013, www.nrea.gov.eg.

Thank You for Your
40
2002 Stefan R. Müller .www.blinde-kuh.de
Thank You for Your
Attention

Harmonic analysis:
0,015
0,012
0,009
41
1,00 5,00 9,00 13,0 17,0 21,0 25,0 29,0 33,0 37,0 41,0 45,0 49,0 [-]
0,006
0,003
0,000
PWM Converter/1 DC-Connection: Current, Magnitude/Terminal AC in p.u.
Figure (15): Harmonic Distortion (Current/ Terminal AC in p.u) For the Converter

1. Simple Model in Power Factory:
Ucell=Uc-UR
42
Figure (8): Simple Battery Model in Power Factory [11]

2.Advanced Model (Ceraolo Model)in Power Factory:
43
Figure (10): Advanced Battery Model (Ceraolo Model) In Power Factory

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