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A Simulation-Based Procedure to Determine Optimum Range of Settings of Fast Valving Action of Steam Turbines to Enhance Frequency Stability

Authors:

K. J. Lakmewan ,

Ceylon Electricity Board, LK
About K. J.

Electrical Engineer


AMIE (SL), B.Sc. Eng. (Hons.) (Moratuwa), M.Sc. (Moratuwa)

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D. Prasad Wadduwage,

University of Moratuwa, LK
About D. Prasad

Senior Lecturer, Department of Electrical Engineering

B.Sc. Eng. (Moratuwa), Ph.D. (Manitoba), MPhil (Moratuwa)

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D. G. Rienzie Fernando

Amithi Power Consultants (Pvt) Ltd., LK
About D. G. Rienzie

Managing Director


C.Eng, MIE (SL), B.Sc. Eng. (Hons.) (Moratuwa)

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Abstract

Fast Valving (FV) mechanism of steam turbines is considered to be one of the most effective actions for enhancing the security of a power system subsequent to disturbances. It plays a significant role in mitigating the impact of severe disturbances by instantly decreasing steam turbine power, thus ensuring the power system stability. There is a direct relationship between the settings of Over-Speed Protection Control (OPC) unit of steam turbines and the control functions of FV. This paper proposes a generalized simulation-based procedure to determine the optimum intermediate valve actuation timings of the FV control action. A coal-fired thermal power plant has been used as the case study and the accuracy of the settings made using the proposed approach has been demonstrated using actually happened contingencies in a real power system. Finally, it is concluded that the proper selection of actuation timings of intermediate valves for FV scheme has a significant effect on enhancing frequency stability under transient conditions.
How to Cite: Lakmewan, K.J., Wadduwage, D.P. and Fernando, D.G.R., 2020. A Simulation-Based Procedure to Determine Optimum Range of Settings of Fast Valving Action of Steam Turbines to Enhance Frequency Stability. Engineer: Journal of the Institution of Engineers, Sri Lanka, 53(2), pp.23–32. DOI: http://doi.org/10.4038/engineer.v53i2.7409
Published on 30 Apr 2020.
Peer Reviewed

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