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Title: Model predictive control system and method for integrated gasification combined cycle power generation

Abstract

Control system and method for controlling an integrated gasification combined cycle (IGCC) plant are provided. The system may include a controller coupled to a dynamic model of the plant to process a prediction of plant performance and determine a control strategy for the IGCC plant over a time horizon subject to plant constraints. The control strategy may include control functionality to meet a tracking objective and control functionality to meet an optimization objective. The control strategy may be configured to prioritize the tracking objective over the optimization objective based on a coordinate transformation, such as an orthogonal or quasi-orthogonal projection. A plurality of plant control knobs may be set in accordance with the control strategy to generate a sequence of coordinated multivariable control inputs to meet the tracking objective and the optimization objective subject to the prioritization resulting from the coordinate transformation.

Inventors:
; ; ;
Publication Date:
Research Org.:
NETL (National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV (United States))
Sponsoring Org.:
USDOE
OSTI Identifier:
1083781
Patent Number(s):
8,417,361
Application Number:
13/053,731
Assignee:
General Electric Company (Niskayuna, NY) NETL
DOE Contract Number:
FC26-07NT43094
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION

Citation Formats

Kumar, Aditya, Shi, Ruijie, Kumar, Rajeeva, and Dokucu, Mustafa. Model predictive control system and method for integrated gasification combined cycle power generation. United States: N. p., 2013. Web.
Kumar, Aditya, Shi, Ruijie, Kumar, Rajeeva, & Dokucu, Mustafa. Model predictive control system and method for integrated gasification combined cycle power generation. United States.
Kumar, Aditya, Shi, Ruijie, Kumar, Rajeeva, and Dokucu, Mustafa. Tue . "Model predictive control system and method for integrated gasification combined cycle power generation". United States. doi:. https://www.osti.gov/servlets/purl/1083781.
@article{osti_1083781,
title = {Model predictive control system and method for integrated gasification combined cycle power generation},
author = {Kumar, Aditya and Shi, Ruijie and Kumar, Rajeeva and Dokucu, Mustafa},
abstractNote = {Control system and method for controlling an integrated gasification combined cycle (IGCC) plant are provided. The system may include a controller coupled to a dynamic model of the plant to process a prediction of plant performance and determine a control strategy for the IGCC plant over a time horizon subject to plant constraints. The control strategy may include control functionality to meet a tracking objective and control functionality to meet an optimization objective. The control strategy may be configured to prioritize the tracking objective over the optimization objective based on a coordinate transformation, such as an orthogonal or quasi-orthogonal projection. A plurality of plant control knobs may be set in accordance with the control strategy to generate a sequence of coordinated multivariable control inputs to meet the tracking objective and the optimization objective subject to the prioritization resulting from the coordinate transformation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Apr 09 00:00:00 EDT 2013},
month = {Tue Apr 09 00:00:00 EDT 2013}
}

Patent:

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  • The primary project objectives were to understand how the process design of an integrated gasification combined cycle (IGCC) power plant affects the dynamic operability and controllability of the process. Steady-state and dynamic simulation models were developed to predict the process behavior during typical transients that occur in plant operation. Advanced control strategies were developed to improve the ability of the process to follow changes in the power load demand, and to improve performance during transitions between power levels. Another objective of the proposed work was to educate graduate and undergraduate students in the application of process systems and control tomore » coal technology. Educational materials were developed for use in engineering courses to further broaden this exposure to many students. ASPENTECH software was used to perform steady-state and dynamic simulations of an IGCC power plant. Linear systems analysis techniques were used to assess the steady-state and dynamic operability of the power plant under various plant operating conditions. Model predictive control (MPC) strategies were developed to improve the dynamic operation of the power plants. MATLAB and SIMULINK software were used for systems analysis and control system design, and the SIMULINK functionality in ASPEN DYNAMICS was used to test the control strategies on the simulated process. Project funds were used to support a Ph.D. student to receive education and training in coal technology and the application of modeling and simulation techniques.« less
  • System and method to estimate variables in an integrated gasification combined cycle (IGCC) plant are provided. The system includes a sensor suite to measure respective plant input and output variables. An extended Kalman filter (EKF) receives sensed plant input variables and includes a dynamic model to generate a plurality of plant state estimates and a covariance matrix for the state estimates. A preemptive-constraining processor is configured to preemptively constrain the state estimates and covariance matrix to be free of constraint violations. A measurement-correction processor may be configured to correct constrained state estimates and a constrained covariance matrix based on processingmore » of sensed plant output variables. The measurement-correction processor is coupled to update the dynamic model with corrected state estimates and a corrected covariance matrix. The updated dynamic model may be configured to estimate values for at least one plant variable not originally sensed by the sensor suite.« less
  • This patent describes a combined cycle electrical power plant including a steam turbine, a heat recovery steam generator for supplying steam to the steam turbine, a gas turbine for supplying heat to the heat recovery steam generator. The steam generator and gas turbine both produce electrical power under load, and the gas turbine has a control circuit determining the operation therof. A cooldown control system is described for the power generation plant. The system comprises: first means for detecting one of a steaming condition and a non-steaming condition in the heat recovery steam generator; second means responsive to the steamingmore » condition and to a gas turbine STOP signal for reducing the load of the gas turbine toward a minimum load level; third means responsive to the non-steaming condition and to the minimum load level being reached for generating a STOP command and applying the STOP command to the control circuit of the gas turbine, thereby to indicate a sequence of steps to stop the gas turbine.« less
  • A method and system for controlling water level of a drum of a heat recovery steam generator for a combined cycle power plant is provided. The combined cycle power plant includes gas and steam turbines and the steam generator for recovering heat in exhaust gases from the gas turbine and for using the recovered heat to produce and supply steam to the steam turbine. At a start up operation, the water level of the drum is lowered in advance to the plant start up operation so that abrupt rise of the water level due to swelling phenomenon of the boilermore » water which may result in heat losses by damping water out of the plant is prevented. Also, a gas turbine load increase is maintained at a constant level during a period in which the abrupt water level rise is expected so that the swelling phenomenon is avoided.« less
  • This patent describes an integrated gasification combined cycle power generation system, comprising an air separation unit wherein air is compressed, cooled, and separated into an oxygen and nitrogen enriched fractions, a gasification system for generating a fuel gas, an air compressor system for supplying compressed air for use in combusting the fuel gas, a combustion zone for effecting combustion of the compressed air and the fuel gas, and a gas turbine for effecting the generation of power from the resulting combusted gases from the combustion zone in the combined cycle power generation system. It comprises independently compressing feed air tomore » the air separation unit to pressures of from 8 to 20 bar from the compressor system used to compress air for the combustion zone; cryogenically separating the air in the air separation unit having at least one distillation column operating at pressures of between 8 and 20 bar and producing an oxygen enriched fraction consisting of low purity oxygen, and; utilizing at least a portion of the low purity oxygen for effecting gasification of a carbon containing fuel source by partial oxidation in the gasification system and thereby generating a fuel gas stream; removing at least a portion of a nitrogen enriched fraction from the air separation unit and boosting its pressures to a pressure substantially equal to that of the fuel gas stream; and expanding at least another portion of the nitrogen enriched fraction in an expansion engine.« less