Optimal Reactive Power Compensation in Electric Transmission Line using STATCOM
POWER SYSTEM STABILITY ENHANCEMENT BY SIMULTANEOUS AC-DC POWER TRANSMISSION_2012
1. M. TechM. Tech
ThesisThesis
OnOn
POWER SYSTEM STABILITY ENHANCEMENT BY SIMULTANEOUS
AC-DC POWER TRANSMISSION
Submitted By:
ABHISHEK
CHATURVEDI
ID No. : 11MTEEEPS019
Advisor:
Er. Vinay Kumar Tripathi
(Asst. Professor)
Department of Electrical and Electronics Engineering
Shepherd School of Engineering and Technology
Sam Higginbottom Institute of Agriculture, Technology and
Sciences
(Deemed-To-Be-University)
Allahabad-211007, Uttar Pradesh
3. The concept of simultaneous ac-dc power transmission.Long
extra high voltage (EHV) ac lines cannot be loaded to their
thermal limits due to this instability occurs in the power
system
It is possible to load these lines very close to their thermal
limits.
The conductors are allowed to carry usual ac along dc
superimposed on it.
4. The advantage of parallel ac-dc transmission for
improvement of transient stability and dynamic stability and
damp out oscillations have been established.
Simulation study is carried out in MATLAB software
package. The results shows the stability of power system
when compared with only ac transmission.
6. To emphasize the possibility of simultaneous ac-dc
transmission with its inherent advantage of power flow control
improves stability and damps out oscillations in power system.
To achieve the advantages of parallel ac-dc transmission in
some specific applications LV (low voltage) and MV (Medium
voltage) system.
8. Using flexible ac transmission system (FACTS) components .
Very fast control of SCRs in FACTS devices like state VAR
system (SVS), controlled series capacitor (CSC), static phase
shiftier (SPS) and controlled braking resistors oscillations as
well as to control the voltage profile of the line by controlling
the total reactive power flow.
The flexible ac transmission system (FACTS) concepts, based
on applying state-of-the-art power electronic technology to
existing ac transmission system, improve stability to achieve
power transmission close to its thermal limit.
23. Benefits of utilizing FACTS devices
The benefits of utilizing FACTS devices in electrical transmission systems
can be summarized as follows
Better utilization of existing transmission system assets
Increased transmission system reliability and availability
Increased dynamic and transient grid stability and reduction of loop flows
Increased quality of supply for sensitive industries
Environmental benefits Better utilization of existing transmission system
assets
24. CONCLUSION
A simple scheme of simultaneous EHV ac-dc power
transmission through the same transmission line has been
presented.
Active and reactive powers associated with ac and dc,
conductor voltage level and total power have been obtained
for steady state normal operating condition.
Simulation studies are being made for the co-ordinated
control and also individually the control of ac and dc power
transmitted through the lines.
25. There is substantial gain in the loading capability of the line
The possibility of converting a dual circuit ac line into
simultaneous ac-dc power transmission block to improve
power transfer as well as to achieve reliability in the power
transfer.
The added dc power flow is flawless and is not the cause of
any transient instability.
27. [1] N. G. Hingorani, “FACTS—flexible A.C. transmission system,”
in Proc. Inst. Elect. Eng. 5th. Int. Conf. A.C. D.C. Power
Transmission,
[2] Padiyar.’HVDC Power Transmission System.’ Wiley Eastern,
New Delhi, 1993)
[3] H. Rahman and B H Khan “Stability Improvement of Power
Systemby Simultaneous AC-DC Power Transmission” Electric Power
System Research Journal, Elsevier, Paper Editorial ID No. EPSRD-
06-00732, Press Article No. EPSR-2560— Digital Object.
Editor's Notes
How electricity gets to you
Generation: About half of the electricity in India is generated by coal-fired generation plants. Natural gas and renewable generation, including hydroelectric, biomass are also sources of Indian electricity.
Transmission: Once generated, electricity travels across India from generating plants over high-voltage transmission lines to local transformers. The transformers reduce the voltage level making it suitable for local distribution to customers.
Distribution - this is where comes inElectricity travels from the transformers via low-voltage distribution lines, owned by India, to your home or business.