Power upgrading of Transmission Line by Simultaneous AC DC transmission
- 1. I.E.S COLLEGE OF ENGINEERING CHITTILAPPILLY, THRISSUR POWER UPGRADING OF TRANSMISSION LINE BY COMBINING AC-DC TRANSMISSION GUIDED BY: EDISON A.J ASST.PROFESSOR EEE DEPT. IESCE PRESENTED BY: GROUP NO. 10 DHANESH K.N (09) JASIM N.C (17) MUKHTHAR U.P (34) SULFATH N.P (52) VEENA VIVEK (55) 08-04-2014IESCE,Chittilapilly 1
- 2. OVERVIEW • OBJECTIVE • INTRODUCTION • SCHEMATIC DIAGRAM • MATLAB SIMULINK MODELS • SIMULATION GRAPHS • ANALYSIS • ADVANTAGES • CONCLUSION • PROJECT REVIEW • BIBLIOGRAPHY 08-04-2014IESCE,Chittilapilly 2
- 3. OBJECTIVE • Power transfer enhancement , without any alteration in the existing Extra High Voltage AC line. • To utilize the advantage of parallel ac–dc transmission by loading the line close to its upper thermal limit. 08-04-2014IESCE,Chittilapilly 3
- 4. INTRODUCTION • Long extra high voltage (EHV) ac lines cannot be loaded to their thermal limits in order to keep sufficient margin against transient instability. • In simultaneous ac-dc power transmission system, the conductors are allowed to carry dc current superimposed on ac current. • The added power flow does not cause of any transient instability. 08-04-2014IESCE,Chittilapilly 4
- 5. 08-04-2014IESCE,Chittilapilly 5 BASIC SCHEME FOR COMPOSITEAC-DC TRANSMISSION
- 9. DESIGN • 115kV, 50Hz, 450 km D/C AC transmission line • The total power transfer through the circuit line 𝑃′ 𝑡𝑜𝑡𝑎𝑙 ≈ 3𝑉𝑝ℎ 2 sin 𝛿 /X • AC current per phase per circuit of the line. 𝐼 𝑎 = V (sin 𝛿/2)/X. • Transfer reactance per phase, X = 74.4435 ohm/ph. • Total power = 𝑃𝑎𝑐 + 𝑃𝑑𝑐. • Power transfer through AC-DC combined line 𝑃𝑡𝑜𝑡𝑎𝑙 ≈ 3𝑉𝑝ℎ 2 sin 𝛿 /X+ 2𝑉𝑑 𝐼 𝑑. 08-04-2014IESCE,Chittilapilly 9
- 10. MASTERCONTROL 08-04-2014IESCE,Chittilapilly 10 • The Master Control system generates the current reference for both converters. • Initiates the starting and stopping of the DC power transmission. • The protection systems can be switched on and off. • At the rectifier, the DC fault protection detects a fault on the line and takes the necessary action to clear the fault.
- 11. 08-04-2014IESCE,Chittilapilly 11 SIMULATION OF RECTIFIER SIMULATION OF INVERTER
- 12. AC FILTER 08-04-2014IESCE,Chittilapilly 12 Reactive power , 𝑄𝑐 = (𝑉2 / 𝑋𝑐 )·𝑛2 /((𝑛2 – 1) Tuned harmonic order, n= 𝑓𝑛/ 𝑓1. Quality factor, Q = n 𝑋 𝐿 /R = 𝑋𝑐 /(n R) Where, fn – tuning frequency f1- fundamental frequency
- 13. SIMULATION GRAPHS 08-04-2014IESCE,Chittilapilly 13 AC ALONE: • AC VOLTAGE: SENDING END, RECEIVING END • AC CURRENT: SENDING END, RECEIVING END • SENDING END POWER: ACTIVE, REACTIVE • RECEIVING END POWER: ACTIVE, REACTIVE AC-DC COMBINED: • VOLTAGE: SENDING END, RECEIVING END • CURRENT: SENDING END, RECEIVING END • DC CURRENT: RECTIFIER, INVERTER • SENDING END POWER: ACTIVE, REACTIVE • RECEIVING END POWER: ACTIVE, REACTIVE
- 14. AC VOLTAGE 08-04-2014IESCE,Chittilapilly 14 AC CURRENT AC TRANSMISSION
- 15. SENDING END POWER 08-04-2014IESCE,Chittilapilly 15 RECEIVING END POWER ACTIVE REACTIVE ACTIVE REACTIVE
- 17. DC CURRENTS 08-04-2014IESCE,Chittilapilly 17 RECTIFIER AND INVERTER DC CURRENTS
- 20. ANALYSIS 08-04-2014IESCE,Chittilapilly 20 Power (MW) Thermal limit 0f 115kV 615 Power transfer of double circuit AC line 328 Power transfer of combined AC-DC system 607
- 21. ADVANTAGES • Conductors can be loaded close to their thermal limit. • The power flow does not impose any stability problem. • No alterations of conductors, insulator strings or towers of the original line are needed. • Helps to improve stability and damping out of oscillations. 08-04-2014IESCE,Chittilapilly 21
- 22. CONCLUSION • The merits to convert existing double circuit ac transmission line to composite ac-dc transmission line for substantial power upgrading have been demonstrated. • Studied that there is substantial increase in the load ability of the line. • The load ability further increases with increase in the length of line. • The line is loaded near to its thermal limit with the superimposed dc current. • The capacity of the transmission line is increased by 85.06 % . 08-04-2014IESCE,Chittilapilly 22
- 23. PROJECT REVIEW 08-04-2014IESCE,Chittilapilly 23 MONTH STATUS June 2013 Proposal & finalisation of topic July 2013 Research for thesis August 2013 Zeroth Presentation September 2013 Data collection October 2013 1st review presentation December 2013 Simulation of AC started January 2014 Output obtained February 2014 Simulation of AC DC started April 2014 project completed
- 24. BIBLIOGRAPHY • Basu and B. H. Khan-Simultaneous ac-dc power transmission. • H. Rahman and B. H. Khan, ―Enhanced power transfer by Simultaneous transmission of AC-DC: a new FACTS concept. • T.Vijay Muni, T.Vinoditha, D.Kumar Swamy - ―Improvement of Power System Stability by Simultaneous AC-DC Power Transmission • N. G. Hingorani, ―FACTS—flexible A.C. transmission system,‖ in Proc. Inst. Elect. Eng. 5th. Int. Conf. A.C. D.C. Power Trans- mission • L. K. Gyugyi et al., ―The unified power flow controller; a new approach to power transmission control,‖ IEEE Trans. Power Del., vol. 10, no. 2, pp. 1085– 1097, Apr. 1995. • Kundur, Power System Stability and Control. New York: Mc-Graw-Hill, 1994. 08-04-2014IESCE,Chittilapilly 24