Control Reconfiguration of a Boiler-Turbine Unit After Actuator Faults

Document Type : Research Article

Authors

Department of Electrical Engineering Amirkabir University of Technology Tehran, Iran

Abstract

Boiler-turbines are one of the most important parts in power generation plants. The safety problem in such systems has always been a special concern. This paper discusses the application of control reconfig uration by fault-hiding approach for a boiler-turbine unit. In Fault-hiding approach, after occurrence of a fault, nominal controller of the system remains unchanged; instead, a reconfiguration block is designed and placed between nominal controller and faulty plant to modify input signals. Three major faults are assumed to occur in three actuators of the system consisting of fuel flow valve, steam control valve and water flow valve. Faults cause the outputs of the plant to deviate from desired values and in some cases cause instability in the system. Setpoint tracking recovery and optimal performance recovery problems to diminish effects of the faults are investigated. The results of simulations show that the reconfiguration has been successful in both cases and also confirm the applicability of the method for the boiler-turbine unit since the reconfigured closed-loop system has had tolerable properties against faults.

Keywords


[1] T. Steffen, Control reconfiguration of dynamical systems: linear approaches and structural tests, Springer Science & Business Media, 2005.
[2] M. Blanke, M. Kinnaert, J. Lunze, M. Staroswiecki, J. Schröder, Diagnosis and fault-tolerant control, Springer, 2006.
[3] A. Esna Ashari*, A. Khaki Sedigh, M. Yazdanpanah, Reconfigurable control system design using eigenstructure assignment: static, dynamic and robust approaches, International Journal of Control, 78(13) (2005) 1005-1016.
[4] J. Maciejowski, C. Jones, MPC fault-tolerant flight control case study: Flight 1862, in: Proceedings of the International Federation of Automatic Control on Safeprocess Sympoisum, 2003, pp. 119-124.
[5] Z. Gao, P.J. Antsaklis, Stability of the pseudo-inverse method for reconfigurable control systems, International Journal of Control, 53(3) (1991) 717-729.
[6] J. Lunze, D. Rowe-Serrano, T. Steffen, Control reconfiguration demonstrated at a two-degrees-of-freedom helicopter model, in: European Control Conference (ECC), 2003, IEEE, 2003, pp. 2254-2260.
[7] E.A. Jonckheere, G.-R. Yu, Propulsion control of crippled aircraft by H/sub/spl infin//model matching, IEEE Transactions on Control Systems Technology, 7(2) (1999) 142-159.
[8] J.H. Richter, Reconfigurable control of nonlinear dynamical systems: a fault-hiding approach, Springer, 2011.
[9] J.H. Richter, T. Schlage, J. Lunze, Control reconfiguration of a thermofluid process by means of a virtual actuator, IET Control Theory & Applications, 1(6) (2007) 1606-1620.
[10] D.-H. Zhou, P. Frank, Fault diagnostics and fault tolerant control, IEEE Transactions on Aerospace and Electronic Systems, 34(2) (1998) 420-427.
[11] H. Noura, D. Sauter, F. Hamelin, D. Theilliol, Fault-tolerant control in dynamic systems: Application to a winding machine, IEEE control systems, 20(1) (2000) 33-49.
[12] B. Wu, X. Cao, L. Xing, Robust adaptive control for attitude tracking of spacecraft with unknown dead-zone, Aerospace Science and Technology, 45 (2015) 196-202.
[13] S. Aliakbari, M. Ayati, J.H. Osman, Y.M. Sam, Second-order sliding mode fault-tolerant control of heat recovery steam generator boiler in combined cycle power plants, Applied Thermal Engineering, 50(1) (2013) 1326-1338.
[14] J. Kortela, S.-L. Jämsä-Jounela, Fault-tolerant model predictive control (FTMPC) for the BioGrate boiler, in: Emerging Technologies & Factory Automation (ETFA), 2015 IEEE 20th Conference on, IEEE, 2015, pp. 1-6.
[15] W. Birk, N. Dudarenko, Reconfiguration of the air control system of a bark boiler, IEEE Transactions on Control Systems Technology, 24(2) (2016) 565-577.
[16] Y. Diao, K.M. Passino, Stable fault-tolerant adaptive fuzzy/neural control for a turbine engine, IEEE Transactions on Control Systems Technology, 9(3) (2001) 494-509.
[17] C. Sloth, T. Esbensen, J. Stoustrup, Active and passive fault-tolerant LPV control of wind turbines, in: American Control Conference (ACC), 2010, IEEE, 2010, pp. 4640-4646.
[18] E. Kamal, A. Aitouche, R. Ghorbani, M. Bayart, Robust fuzzy fault-tolerant control of wind energy conversion systems subject to sensor faults, IEEE Transactions on Sustainable Energy, 3(2) (2012) 231-241.
[19] A. Kazemi, M.B. Menhaj, M. Karrai, A. Daneshnia, Control reconfiguration of a boiler-turbine unit after actuator faults, in: Control, Instrumentation, and Automation (ICCIA), 2016 4th International Conference on, IEEE, 2016, pp. 439-444.
[20] K.J. Åström, R. Bell, Dynamic models for boiler-turbine alternator units: Data logs and parameter estimation for a 160 MW unit, Technical Reports, (1987).
[21] W. Tan, F. Fang, L. Tian, C. Fu, J. Liu, Linear control of a boiler–turbine unit: Analysis and design, ISA transactions, 47(2) (2008) 189-197.
[22] T. Wen, N. Yuguang, L. Jizhen, Robust control for a nonlinear boiler-turbine system, Control Theory and Applications, 16(6) (1999) 863-867.
[23] S. Boyd, L. El Ghaoui, E. Feron, V. Balakrishnan, Linear matrix inequalities in system and control theory, Siam, 1994.