An experiment-based model of condensate throttling and its utilization in load control of 1000 MW power units

Abstract Coal-fired power units are important to stabilize the grid fluctuation especially for the electrical power system with a large proportion of renewable sources. The unit load change speed and range controlled by traditional coordinate control system has become more and more insatiable for the integrations of fluctuant power sources. Condensate throttling is an efficient way to utilize storage energy of units, the mechanism analysis of regulating range and regulation maximum period in wide range of operating condition is proposed, and dynamic model in varying operation conditions is established through lots of trial experiments in a 1000 MW coal-fired power plant, the parameters of model are also discussed in different operating situations. A novel coordinate control system combining traditional coordinate control and condensate throttling system is proposed and the control performance in different regulating rates is investigated, the results and load distribution analysis proved that novel strategy achieve a superior fast response ability and static accuracy.

[1]  Jizhen Liu,et al.  Fuzzy supervisory control and simulation on a 500 MW unit coordinated control system , 2003, Proceedings of the 2003 IEEE International Symposium on Intelligent Control.

[2]  Dong Liu,et al.  Improvement of Load-Following Capacity Based on the Flame Radiation Intensity Signal in a Power Plant , 2008 .

[3]  Mohammad Reza Jahed-Motlagh,et al.  Piecewise affine modeling and control of a boiler–turbine unit , 2010 .

[4]  Wen Tan,et al.  Multivariable robust controller design for a boiler system , 2002, IEEE Trans. Control. Syst. Technol..

[5]  Jizhen Liu,et al.  A dynamic model used for controller design of a coal fired once-through boiler-turbine unit , 2015 .

[6]  C. W. Chan,et al.  Nonlinear Multivariable Power Plant Coordinate Control by Constrained Predictive Scheme , 2010, IEEE Transactions on Control Systems Technology.

[7]  Fang Fang,et al.  Nonlinear inversion-based output tracking control of a boiler-turbine unit , 2005 .

[8]  Wen Tan,et al.  Analysis and control of a nonlinear boiler-turbine unit , 2005 .

[9]  Le Wei,et al.  Backstepping-based nonlinear adaptive control for coal-fired utility boiler–turbine units , 2011 .

[10]  Ming Xia,et al.  Application of Active Disturbance Rejection Control technology in distributed Control System of coal-fired power generation , 2010, Proceedings of the 29th Chinese Control Conference.

[11]  Kwang Y. Lee,et al.  Boiler-turbine control system design using a genetic algorithm , 1995 .

[12]  J Wu,et al.  Robust H(infinity) tracking control of boiler-turbine systems. , 2010, ISA transactions.

[13]  Fang Fang,et al.  Tuning of Coordinated Controllers for Boiler-turbine Units 1) , 2005 .

[14]  Jizhen Liu,et al.  Modeling for condensate throttling and its application on the flexible load control of power plants , 2016 .

[15]  Sung-Ho Kim,et al.  Controller Design for a Large-Scale Ultrasupercritical Once-Through Boiler Power Plant , 2010, IEEE Transactions on Energy Conversion.

[16]  X. Lei,et al.  Frequency security constrained short-term unit commitment , 2002 .

[17]  Zhang Chunfa,et al.  A steam-water distribution matrix equation of the whole thermal system for coal-fired power plant and its general construction regulations , 1999 .

[18]  Jizhen Liu,et al.  Variable-speed technology used in power plants for better plant economics and grid stability , 2012 .

[19]  Wen Tan,et al.  Linear control of a boiler-turbine unit: analysis and design. , 2008, ISA transactions.

[20]  Xu Zhiqiang,et al.  Nonlinear coordinated control of drum boiler power unit based on feedback linearization , 2005 .

[21]  E. Welfonder,et al.  Economic Spinning Reserve Power by Controlled Preheater Activation , 1992 .

[22]  G. K. Lausterer,et al.  Improved maneuverability of power plants for better grid stability , 1998 .

[23]  Adel Abdennour.  An intelligent supervisory system for drum type boilers during severe disturbances , 2000 .

[24]  Ji-Zhen Liu,et al.  Dynamic model for controller design of condensate throttling systems. , 2015, ISA transactions.

[25]  Tianshu Bi,et al.  The utilization of large-scale renewable powers with high security and efficiency in smart grid , 2012, PES 2012.

[26]  Han Li,et al.  A novel RBF-PID control strategy for turbine governing system based on chaotic PSO , 2011, 2011 9th World Congress on Intelligent Control and Automation.

[27]  Jizhen Liu,et al.  Feasibility analysis of changing turbine load in power plants using continuous condenser pressure adjustment , 2014 .