Design of a New Discrete Sliding Mode Optimal Controller for Load Frequency Control in Multi Area Deregulated Power System

A. Ganga Dinesh Kumar(1*), N. Venkata Ramana(2)

(1) Electrical & Electronics Engineering Department, Sridevi, India
(2) J.N.T.U.H College of Engineering, Manthani, A.P., India
(*) Corresponding author

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The performance of designed linear controller in a highly nonlinear power system is always be a doubtful. This paper presents a new load frequency control methodology in a multi area deregulated power system using discrete optimal sliding mode controller. This proposed control strategy shall take care of nonlinearities, uncertainties and chaos of the system. The performance of the proposed controller is tested on two area thermal-thermal and hydro-thermal deregulated power systems including bilateral contracts. The performance of proposed discrete optimal sliding mode controller is compared with discrete PI controller.
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Load Frequency Control; Deregulation; Optimal Discrete Sliding Mode Controller; Discrete PI Controller

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T. Anil Kumar, V.sai Krishna, N. Venkata Ramana, Improvement of dynamic performance of three area thermal system under deregulated environment using AC tie-line parallel with HVDC link. International Conference on Power and Energy Systems (ICPS), 2011.

Duy-Ky Nguyen, “Sliding-Mode Control: Advanced design Techniques”, 1998.

Elgerd OI. Electric energy system theory: an introduction. New York: McGraw-Hill; 1971

K. Vrdoljak, N. Peric, I. Petrovíc, Sliding mode based load-frequency control in power systems, Electric Power Systems Research80 (2010) 514–527.Science Direct.

VaibhavDonde, M.A.Pai, Ian A.Hiskens, Simulation and optimization in an AGC system after deregulation. IEEE proceedings 2001.

Vrdoljak, K., Peric, N., Mehmedovic, M. “Optimal parameters for sliding mode based load-frequency control in power systems”, International Workshop on Variable Structure Systems, 2008, Page(s): 331 – 336.

F. Okafor, “Variable structure unit vector control of electric power generation,” African Journal of Science and Technology - Science and Engineering Series, vol. 1, no. 4, pp. 78–86, 2001.

Y Y Hsu, W C Chan, “Optimal variable structure controller for the load frequency of inter connected Hydro Thermal Power Systems”, Electrical Power Energy Systems Vol 6, 1984.

C. Edwards, and S.K. Spurgeon, Sliding Model Control: Theory and Applications, Taylor and Francis Ltd, U.K., 1998.

JavadSadeh, ElyasRakhsani, Load frequency control of multi area Restructured power system.

V.Donde, M.A Pai, I.A. Hiskens, Simulation of bilateral contacts in an AGC system after Restructuring. IEEE proceedings.

JavadSadeh, ElyasRakhsani, Multi area load frequency control in a deregulated power system using optimal output feedback method. IEEE proceedings 2008.

Tamara Radosevic, Kresimir, Vrdoljak, student member, IEEE, NeedjeljkoPeric, Senior member IEEE, “Optimal Sliding Mode Controller for Power Systems load frequency control”.

B. Bandyopadhyay and S. Janardhanan, Discrete-time Sliding Mode Control: A Multirate Output Feedback Approach, Springer, Germany, 2006.

M. Yang and H. Lu, “Sliding mode load-frequency controller design for dynamic stability enhancement of large-scale interconnected power systems,” in Proceedings of the IEEE International Symposium on Industrial Electronics, Bled, Slovenia, 1999, pp. 1316–1321.

Liu F, Song YH, Ma J, Lu Q. Optimal load frequency control in the restructured power systems. IEEE ProcGenerTransmDistrib 2003; 15(1) : 87–95.

Stanislaw H. Zak, Systems and Control, Oxford University Press, 2003.

Y. H. Moon, H. S. Ryu, J. G. Lee, K. B. Song, and M. C. Shin, “Extended integral control for load - frequency control with the consideration of generation rate constraints,” International Journal of Electrical Power and Energy Systems, vol. 24, pp. 263–269, 2002.

A. Bose and I. Atiyyah, “Regulation Error in Load-Frequency Control,”IEEE Transactions on Power Apparatus and Systems, vol. PAS-99, no. 2, pp. 650–657, 1980.

N. Jaleeli, L. S. Vanslycn, D. N. Ewart, L. H. Fink, and A. G. Hoffmann,“Understanding automatic generation control,” IEEE Transactions on Power Systems, vol. 7, pp. 1106–1122, 1999.

I. P. W. group, “Hydraulic turbine and turbine control models for system dynamics,” IEEE Transactions on Power Systems, vol. PWRS-7, no. 1, pp. 167–174, Feb 1992.

I. C. Report, “Dynamic models for steam and hydro turbines in power system studies,” IEEE Transactions on Power Apparatus and Systems,vol. PAS-92, no. 6, pp. 1904–1915, Nov/Dec 1973.

M. L. Kothari, P. S. Satsangi, and J. Nanda, “Automatic generation control of an interconnected hydrothermal system in continuous anddiscrete mode considering generation rate constraints,” Proc. IEE, vol.130, Pt. C, no. D-1, pp. 17–21, 1983.

D. Das, J. Nanda, M. L. Kothari, and D. P. Kothari, “Automaticgeneration control of a hydrothermal system with new area control error considering generation rate constraints,” Electric Machines and Power Systems, vol. 18, pp. 461–471, 1990.

Shahgholian, G., Rajabi, A., Karimi, B., Analysis and design of PSS for multi-machine power system based on sliding mode control theory, (2010) International Review of Electrical Engineering (IREE), 5 (5), pp. 2241-2250.

Kumar, T.A., Ramana, N.V., Design of optimal sliding mode functional observer for load frequency control in multi-area deregulated thermal system, (2012) International Review on Modelling and Simulations (IREMOS), 5 (6), pp. 2532-2545.

Anil Kumar, T., Venkata Ramana, N., Design of sliding mode observer based optimal controller for load frequency control in multi area deregulated thermal system connected with HVDC link, (2013) International Review on Modelling and Simulations (IREMOS), 6 (2), pp. 543-553.


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