A Simulation Model For Use In Testing A Fast-time Predictor Instrument For Benson Boiler Steam Temperature Control
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Date
2015-01-12
Authors
Brandford, David George
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Abstract
The work reported in this dissertation is aimed at
determining a sufficiently accurate model for a section of a
power station boiler plant so that at a later time, a fast-time
predictor instrument may be designed and tested without
interfering with the operation of an on-line boiler unit.
The mode 1 required for the predictor instrument is a
simplification of the simulation model. The instrument
enables the o p e r a t o r to predict, in a short time, how an
action taken now will affect the boiler unit in the future.
It is suggested that such an instrument would enhance the
operator's ability to control the boiler thus providing
faster response times to system and grid disturbances.
The dissertation includes a review of possible boiler control
strategies. A motivation for a fast-time predictor instrument
is provided. An analysis of mechanical engineering aspects of
the boiler and of simulation techniques enabled a model
satisfying the simulation objectives to be developed and
Justified. A technique is suggested for determining the
parameters for these models.
An attempt was made to identify the- model parameters b u t , due
to the limited data available and a suspected violation of
the Nyquist sampling theorem, the attempt was not successful.
Some recommendations are made for improving the quality of
the data logged.
It is concluded that a simulation model for the boiler
processes can be obtained and that the parameter estimation
technique is feasible, but that the complex task of
system identification will require a considerable effort.