Camparative Study of TCSC and UPFC Implemented For Congestion Management in Deregulated Power System

IJSRD - International Journal for Scientific Research & Development| Vol. 3, Issue 08, 2015 | ISSN (online): 2321-0613

Comparative Study of TCSC and UPFC Implemented for Congestion Management in Deregulated Power System Prof. Mrs. V.V. Khatavkar1 Miss. Madhuree M. Hage2 Prof. Mrs.Anjali A. Dharme3 1 Assistant Professor 1,2,3 Department of Electrical Engineering 1,2,3 P.E.S. Modern College of Engineering, Pune-5, India Abstract— One of the technical challenges in Power system deregulation is Congestion. In deregulated electricity market congestion in transmission line occurs when there is inadequate amount of transmission capability to simultaneously accommodate all constraints for transmission of a line. Flexible Alternative Current Transmission System (FACTS) devices is a solution to reduce the flows in over loaded lines, resulting in an increased loadability, controlling the power flow in the network, improved stability of the network ,low system loss, and there by reduced cost of production. This paper deals with effect of different types of FACTS devices such as thyristor controlled series capacitor (TCSC) and Unified Power Flow Controller which are deal with particular 300km,3 Phase,400 V, (L-L), 50 Hz. long transmission line prototype system for improvement of the power flow at receiving end and also the voltage at the receiving will be effected by different types of nonlinearity present in power transmission which improved by FACTS devices. From result we will compare different FACTS devices by which we can conclude that UPFC will have maximum capability for power flow improvement. All simulations have been carried out in MATLAB/SIMULINK environment.

Key words: TCSC, UPFC I. INTRODUCTION As power demand increase day to day life which is lead to congestion in transmission system, the occurrence of transmission congestion in deregulated power systems causes a huge revenue loss to market participants [1]. The solution for this congestion the new technology was developed called as Flexible AC transmission system (FACTS) devices introduced in 1980 by Electrical Power Research institute (EPRI), it helps for optimum utilization of existing power system capacity by replacing mechanical switching controllers with efficient and reliable power electronic devices. Impedance, terminal voltages and phase angle are the parameter of the transmission line which is significantly controlled by FACTS devices.[1-4] According to connection FACTS devices are divided into four type i.e. series controller, shunt controller, combination of series-shunt controller and combination of series-series controller.

(FACTS) controllers should be fixed at appropriate locations in the power system. Flexible AC Transmission Systems (FACTS) technology helps utilities in reducing transmission overcrowding and in utilizing more efficiently the existing transmission system without compromising the reliability and safety of the system. Apart from steady state flow control their quick response offers high potential for stability of power system and its enhancement. The benefits of employing FACTS are many: (a) Increasing the power transfer capability of existing transmission systems, (b)

Directly controlling real and reactive power flow, (c) Provide fast dynamic reactive power support and voltage control, (d) Improving system stability, (e) Reduce financial costs and environmental impact by possible deferral of new transmission lines[6-7].

In this paper among various FACTS controller series controller i.e. thyristor controlled series capacitor (TCSC) and combination of series and shunt controller i.e.

Unified power flow controller (UPFC) are considered.

II. SYSTEM MODEL

Fig. 1: Basic Transmission Line Model.

Fig. 1 shows a simplified model of an uncompensated prototype of 300kV long transmission line system having a simple Pi model using non ohmic capacitors, inductor and resistance. The model is supplied from a 400 V (L-L) voltage source. The source impedance (0.05+j0.005) Ω, line impedance (24+j0.026)Ω and the load is kept constant The system is modelled in SIMULINK platform.. The values of transmission line parameter are taken same as prototype model. RMS block is used to measured Receiving end transmission line current and voltage. This block is then connected to next model that is load. The scopes provided displays the signals generated during the simulation. In this paper, compensation using TCSC and UPFC are studied and compared to obtain the best compensation for the system under study.

III. COMPENSATION SYSTEM A. TCSC Compensation System The MATLAB/SIMULINK model for a TCSC compensated system is shown below,

Fig. 2: Simulink Model of TCSC

All rights reserved by www.ijsrd.com

888

Comparative Study of TCSC and UPFC Implemented for Congestion Management in Deregulated Power System (IJSRD/Vol. 3/Issue 08/2015/230)

IV. COMPARISON OF SIMULATION RESULTS

Fig. 3: Response of receving end voltage with and without compensation Fig. 8: Comparison of receving end voltage with TCSC andUPFC compensation

Fig. 4: Response of receving end power with and without TCSC compensation B. UPFC Compensation System

Fig. 9: Comparison of receving end power with TCSC andUPFC compensation V. CONCLUSION

Fig. 5: UPFC Controller Simulink Model

Fig. 6: Response of receving end voltage with and without compensation

Fig. 7: Response of receving end powerwith and without UPFC compensation

It is seen from the above simulation results that both the Voltage profiles and Power Flow are improved with all the compensating devices, but maximum real and reactive power compensation is obtained with the introduction of UPFC in the system. UPFC offers superior performance in improvement of voltage stability margin and better voltage profiles compared to TCSC because , as the UPFC is a combination of series- shunt controller compensation devices in which shunt part inject the reactive power at the point of connection in transmission line. Also series part maintains the voltage by injecting AC voltage in transmission line directly. The settling time of UPFC is very less than TCSC. From simulation graph we can also concluded that UPFC gives significant improvement in transient stability and steady state stability than TCSC Controller for particular 300km long transmission line prototype system.

REFERENCES [1] Y. Song and X. Wang, Operation of Market-Oriented Power Systems, London, UK: Springer, 2003.

[2] Keshi Reddy Saidi Reddy1, Narayana Prasad Padhy, and R. N. Patel Congestion Managementin Deregulated Power System using FACTS Devices [3] H. Iranmanesh1, M. Rashidi-Nejad1,2,3 and A. A. Gharaveisi1,2 , M. Shojaee3 CongestionRelief via Intelligent Coordination of TCSC & SVC 7th WSEAS Int. Conf. on MathematicalMethods and Computational Techniques In Electrical Engineering, Sofia,2729/10/05 (pp181-186)

All rights reserved by www.ijsrd.com

889

Comparative Study of TCSC and UPFC Implemented for Congestion Management in Deregulated Power System (IJSRD/Vol. 3/Issue 08/2015/230)

[4] Naresh Acharya Arthit Sode-Yome Nadarajah Mithulananthan Facts about Flexible AC Transmission Systems (FACTS) Controllers: Practical Installations and Benefits [5] N. G. Hingorani and L. Gyugyi, ―Understanding FACTS‖, IEEE Press, 1999.

[6] Vrushali, Khatavkar, Redekar Abhijeet, and Dharme Anjali. "Comparative Study of Prototype and Simulation of SVC for Transmission Congestion Management." Power Electronics and Renewable Energy Systems. Springer India, 2015. 923-932.

[7] Facts Controllers In Power Transmission And Distribution K. R. Padiyar [8] Preeti Singh, Mrs.Lini Mathew, Prof. S. Chatterji MATLAB Based Simulation of TCSC FACTS Controller Proceedings of 2nd National Conference on Challenges & Opportunities in Information Technology (COIT-2008) RIMT-IET, Mandi Gobindgarh. March 29, 2008 [9] Xusheng Yang Wanxing Sheng and Xiaoli Meng Sunan Wang A New Solution for Multi- Region Transmission Congestion Management Proceedings of the Sixth International Conference on Intelligent Systems Design and Applications (ISDA'06) -7695-2528-8/06 [10] Mazilah Binti A Rahman Goro Fujita Overview Of Thyristor Controlled Series Capacitor (Tcsc) In Power Transmission System [11] Gannavarapu Akhilesh1* D.Raju Power Flow Control/Limiting Short Circuit Current Using TCSC Innovative Systems Design and Engineering www.iiste.org ISSN 2222-1727 (Paper) ISSN 22222871 (Online) Vol 3, No 2, 2012 [12] Z. Huang, Yixin Ni, C.M.Shen, Felix F. Wu, Shousum chen and baolin Zhang, ―Application of UPFC in interconnected power systems— Modeling, interface, control strategy, and case study,‖ IEEE Trans. Power Syst., vol. 15, no. 2, pp. 817–824, May 2000.

All rights reserved by www.ijsrd.com

890