This document summarizes a study on using STATCOM (Static Synchronous Compensator), a FACTS (Flexible AC Transmission Systems) device, to improve the voltage profile of a power system. STATCOM is a shunt device that can regulate reactive power flow independently of system parameters. The study models a 5-bus system in MATLAB and finds that installing STATCOM at bus 4 results in the minimum voltage deviation and best performance compared to buses 2 and 5. In conclusion, implementing STATCOM can help utilize existing transmission infrastructure more efficiently by reducing losses and improving voltage stability.

1. A Study on Improvement of Voltage Profile of a
Power System Using FACTS Device (STATCOM)
PRESENTED BY
Md. Atikul Islam
ID No: WUB09/09/33/971
Sujan Kumar Ghosh
ID No: WUB09/09/33/975
Department of EEE
World University of Bangladesh
SUPERVISED BY
Raktim Kumar Mondol
Lecturer
Department of EEE
World University of Bangladesh

2. BACKGROUNDBACKGROUND
 The term, Flexible AC Transmission Systems “FACTS” covers
several power electronics based systems used for AC power
transmission and distribution.
 Important applications in power transmission and distribution
involve devices such as SVC, SC as well as TCSC and STATCOM.
 Static VAR Compensation (STATCOM) is one of the advance
power systems known as FACTS controllers, which provides
fast and continuous capacitive and inductive reactive power
supply to the power system.
 Maintain or improve voltage stability, grid reliability and
reduce overall power losses.

3. EXECUTIVE SUMMARYEXECUTIVE SUMMARY
In this paper we studied the shunt operation of FACTS
controller. FACTS devices are mainly use for solving various
power system steady state control problems such as voltage
regulation, power flow control, and transfer capability
enhancement. FACTS device allows transmission systems to be
more efficiently. STATCOM is a shunt FACTS device which can
be used to regulate the flow of reactive power in the system
independent of other system parameters. The study of
STATCOM including phase angle control are carried out.
STATCOM has no long term energy support on the dc side and it
cannot exchange real power with the ac system. In the
transmission systems, STATCOM primarily handle only
fundamental reactive power exchange and provide voltage
support. STATCOM Operating, maintenance and investment
cost are lower than others.

4. METHODOLOGYMETHODOLOGY
Design using different resources found from internet,
books, researches and manuals.
Implemented and check the circuit operation using
MATLAB, Multisilm, 5spice.

5. OBJECTIVESOBJECTIVES
The main objective of FACTS (Flexible AC
Transmission Systems) is to increase the useable
transmission capacity of lines and control power
flow.
To enhance power system stability by using
STATCOM.

6. ADVANTAGES OF FACTSADVANTAGES OF FACTS
Improved power transmission capability.
Improved system stability.
Improved power quality.
Improved load sharing between parallel circuits
Decreased overall system transmission losses

7. TYPE OF FACTS DEVICESTYPE OF FACTS DEVICES
FACTS
DEVICES
SERIES SHUNT COMBINED
SSSC TCSC SVC STATCOM UPFC IPFC

8. COMPARISON BETWEEN STATCOM AND SVCCOMPARISON BETWEEN STATCOM AND SVC

9. STATIC SYNCHRONOUS COMPENSATORSTATIC SYNCHRONOUS COMPENSATOR
(STATCOM)(STATCOM)
STATCOM is a static synchronous generator as shunt
static VAR compensator.
It’s capacitive or inductive current can be controlled
independently of the system voltage.
The STATCOM scheme in parallel with AC power grid
system.
STATCOM controlled by a dynamic controller.

10. BLOCK DIAGRAM OF STATCOMBLOCK DIAGRAM OF STATCOM

11. STATCOM CONVERTER CABINETSTATCOM CONVERTER CABINET
The very compact power electronic modules are placed inside a
cabinet structure. Only a few additional external components
are needed, such as STATCOM transformer, grid filter and heat
exchanger.

12. OPERATING PRINCIPLE OF STATCOMOPERATING PRINCIPLE OF STATCOM
Figure 4. STATCOM Principle diagram

13. CONTROL CHARACTERISTIC OF ACONTROL CHARACTERISTIC OF A
STATCOMSTATCOM
We can say that; If EI> ET the STATCOM is drawing a capacitive
reactive current and if EI< ET the STATCOM is inductive reactive
current. Q=EI(EI-ET)/X

14. CONTROL FUNCTION OF STATCOMCONTROL FUNCTION OF STATCOM
F=VP-VSP=0
 The control of the STATCOM voltage magnitude should be
such that the specified bus voltage and the STATCOM
voltage should be equivalent and there should be no
difference between them.
 Vsp is the specified voltage for the bus.

15. BENEFITS OF USING STATCOMBENEFITS OF USING STATCOM
STATCOM has no inertia.
Better dynamics response.
Lower investment cost.
Lower operating and maintenance cost.

16. Figure. Sample three-Bus study test system with the STATCOM located at
bus B2 to stabilize the AC system.
THREE-BUS SYSTEMTHREE-BUS SYSTEM

17. Figure. Without STATCOM Figure. With STATCOM at Load Bus
4
DIAGRAM OF 5 BUS POWER SYSTEMDIAGRAM OF 5 BUS POWER SYSTEM
STATCOM is a FACTS device which can be used to regulate the flow of reactive power in
the system independent of other system parameters. Here we experimentally set
STATCOM at different bus and show the results by using MATLAB.

18. RESULTSRESULTS
MVAR
provided
by
STATCOM
Load Bus voltage magnitude
with STATCOM
(P.U)
Total
voltage
deviation
of load
busV2 V4 V5
5 0.9616 0.9323 0.9716 0.4204
10 0.9617 0.9417 0.9738 0.4174
15 0.9617 0.9509 0.9760 0.4171
20 0.9617 0.9599 0.9782 0.4235
25 0.9617 0.9688 0.9803 0.4398
Here we observed that when MVA rating is 15 MVA then the total voltage
deviation is minimum which is 0.4171. After that the total voltage deviation
of load bus is increased rapidly.
Bus
No
Load bus voltage
magnitude without
STATCOM (P.U)
1 1.0400
2 0.9616
3 1.0200
4 0.9227
5 0.9692

19. RESULTS ON GRAPHRESULTS ON GRAPH
Bus 2
Bus 4
Bus 5
In the above results we observed that STATCOM at bus 4 is better than 2 and
5. Because voltage deviation is minimum and MVA is good. Although MVA of
bus 2 and 4 are same but total voltage deviation of bus 4 is smaller than
total voltage deviation of bus 2 . Which is expected for us.

20. DISCUSSIONDISCUSSION
With the history of more than three decades and widespread
research and development about FACTS devices, we can say :
 From an economical point of view: FACTS devices help to
distribute the electrical energy more economically through better
utilization of existing installation there by reducing the need for
additional transmission lines. Financial benefit from FACTS devices
comes to increased transmission capability. More power can be
transmitted over existing or new transmission grids at a lower
price.
 From an environmental point of view: The construction of new
transmission line has negative impact on the environment.
STATCOM enables the transmission of power over vast distances
with less impact on our environment. Furthermore, the saving in
transmission losses may well bring a corresponding decrease in
need for generation, with less toll on the environment.

21. CONCLUSIONCONCLUSION
The result shown above by modeling the system in MATLAB and
simulating their result shows that by MATLAB simulation studies.
Thus the proposed controller shows better performance the
power system oscillations. STATCOM provides the most reliable
and efficient solution. If we install STATCOM to our existing
transmission line, we can minimize huge amount of transmission
loss and add extra KV in our national grid that can fill our
shortage of demand and Improved power transmission
capability in Bangladesh. These calls for the right solutions as far
as power transmission facilities.