Design of a Practical Controller for a Commercial Scale Fossil Power Plant

Ray, Asok; Berkowitz, David A.

doi:10.1115/1.3426441

Cited by 10 publications

(3 citation statements)

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“…An excellent survey of the position that has now been reached can be found in Mortensen et al (1997). Various types of multivariable models have been used in the studies and these include SI models (Nakamura and Akaike, 1981;Pedersen et al, 1996) and fairly detailed interpretation models (McDonald and Kwatny, 1973;Ray and Berkowitz, 1979). Where knowledge-based models are used, they generally need to be reduced to manageable form, usually using some systematic model-reduction procedure (Cori and Maffezzoni, 1984).…”

Section: Control Issuesmentioning

confidence: 99%

Some thoughts on the advanced control of electric power plants

Rees

2002

Transactions of the Institute of Measurement and Control

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Over the last decade, there has been considerable change in the electric power generation industry. Larger, faster plants have been constructed and old plants have been forced to operate in a much more dynamic environment, thanks to strong competition and market forces. Massive changes have also occurred in information technology, designed to improve power plant performance, by including large amounts of computing and digital circuits, together with very advanced man-machine interface tools, allowing efficient information retrieval and display at reasonable cost. By contrast, the control systems implemented in the distributed control computer systems remain largely conventional control, a mix of various types of PID control and feedforward, which is not at all what is thought of as advanced control. This paper looks at this issue, and describes some of the advanced controllers that might be very effective in the industry, including many that are being offered to the industry by the control vendor companies. The paper then tries to give reasons why these systems have not been taken up in any significant way, and by using examples from our own experience, attempts to suggest how the situation might be improved.

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Section: Control Issuesmentioning

confidence: 99%

Some thoughts on the advanced control of electric power plants

Rees

2002

Transactions of the Institute of Measurement and Control

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“…For example, the steam temperatures are restricted to remain below a certain level to avoid possible creep damage in the headers and thermal shock in the turbine blades. The tolerable variations of the measured outputs, namely, THS, THR, and PHS, are specified as: THS within 10 F 5.56 C THR within 15 F 8.33 C and PHS within 45 psi (0.310 MPa) [7].…”

Section: B Specification Of Constraintsmentioning

confidence: 99%

“…For example, in the load following mode of a fossil power plant, excursions of the main steam and reheat steam temperature and pressure must be regulated within prescribed limits to ensure plant safety (e.g., protection of the steam headers and turbines). Daily cycling of large generating units that were originally designed for baseload operations has now become an economic necessity for many utility companies [2], [7]. The power plant control system, under these circumstances, must allow rapid load maneuvering without violating the constraints of temperature and pressure oscillations in order to avoid excessive stresses on the plant components [10].…”

Section: Introductionmentioning

confidence: 99%

Robust wide-range control of steam-electric power plants

Weng

Ray

1997

IEEE Trans. Contr. Syst. Technol.

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To facilitate daily cycling of large electric generating units that were originally designed for baseload operation, the control system has to be redesigned for plant maneuverability over the operating range. A methodology for synthesizing an integrated feedforward-feedback control (FF/FBC) strategy is proposed for wide-range robust control of commercial-scale steam-electric power plants. In the proposed methodology, the feedforward control (FFC) policy is generated via nonlinear programming for simultaneous optimization of all control inputs under specified constraints. This family of optimized trajectories, which represent the best achievable performance of the plant under specified conditions, serve as tracking signals for the FF/FBC system. The feedback control (FBC) law is synthesized following the H 1-based structured singular value () approach to achieve the specified stability and performance robustness. The major features of the integrated FF/FBC system are 1) optimized performance over a wide operating range resulting from the feedforward element and 2) guaranteed stability and performance robustness resulting from the feedback element. To exemplify this control methodology, a family of FFC policies has been synthesized based on a nonlinear state-space model of a 525 MWe fossil-fueled power plant. The synthesis of an FFC policy is identified as an optimization problem where the performance is characterized by rapid maneuvering of electric power to meet the specified load demand while simultaneously maintaining the throttle steam temperature and pressure, and the hot reheat steam temperature within allowable ranges of variation. The results of simulation experiments show that the FF/FBC system satisfies the specified performance requirements of power ramp up and down in the range of 40%-100% load under nominal operating conditions. The results also suggest that this robust control law is capable of rejecting the anticipated disturbances such that the plant closely follows the optimal trajectory determined by the FFC policy. Although this research focuses on control and operation of fossil power plants, the proposed FF/FBC synthesis methodology is also applicable to other complex processes such as planned shutdown of nuclear power plants, takeoff and landing of aircraft, and start-up and transient operations of rocket engines.

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Nonlinear dynamic model of a solar steam generator

Ray

1981

Solar Energy

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Design of a Practical Controller for a Commercial Scale Fossil Power Plant

Cited by 10 publications

References 0 publications

Some thoughts on the advanced control of electric power plants

Some thoughts on the advanced control of electric power plants

Robust wide-range control of steam-electric power plants

Nonlinear dynamic model of a solar steam generator

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