Advanced Control of Solar Plants by Eduardo F. Camacho, Manuel Berenguel, Francisco R. Rubio

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By Eduardo F. Camacho, Manuel Berenguel, Francisco R. Rubio (auth.)

There is a few measure of separation among the advance of complicated keep watch over algorithms in the examine group and their use in business perform. numerous techniques constructed from experimental learn into enhancing the potency of sunlight thermal strength vegetation are the following tested within the context in their commercial application.

The options defined and utilized are:

  • modeling and simulation;
  • adaptive control;
  • model-based predictive control;
  • frequency area keep an eye on and strong optimum keep an eye on; and
  • fuzzy good judgment keep an eye on.

Their effectiveness during this keep watch over method is classified and a few of the ideas' merits and disadvantages are analyzed and in comparison. the implications received will be simply prolonged to different business tactics; during this context, the sunlight keep an eye on method tested offers an excellent test-bed because it indicates a few of the difficulties present in different techniques, comparable to nonlinearities, altering dynamics and powerful exterior disturbances.

This is a complete research of the sensible software of alternative regulate concepts that may be of curiosity to manage engineers operating in solar energy platforms and all through different procedure industries, and to researchers, scientists and graduate scholars during this field.

Advances in commercial Control goals to document and inspire the move of know-how up to the mark engineering. The swift improvement of keep an eye on know-how has an influence on all components of the regulate self-discipline. The sequence bargains a chance for researchers to offer a longer exposition of recent paintings in all points of business control.

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However the method was extremely sensitive to imprecisions in the parameters and to structural modifications. An outstanding property is that the closed loop transfer function obtained when the state is directly accessible (thus without observer or Kalman filter) is the same as if this last module was included. That is, the closed loop transfer function does not include the observer. This fact led to the conclusion that the observer was irrelevant in the design of the closed loop system. This erroneous belief lasted for more than a decade.

000. ' 15 •4$ ISO IocaIlIrIMIlhouu) 'u (I / ~) C=~------,.. 0 E J!! -_. 0 local time (hours) sN point. inl~' ""d oll,ll'! oil Fig. 7. 1 Analysis of the time response One of the tests carried out to characterize the field consists of introducing a step input signal in the oil flow in an open loop configuration. 8 (at noon). As can be appreciated, the response can be approximated by that of a first order system or overdamped second order system with a delay. This kind of step response suggests the use of low order linear descriptions of the plant (as is usually done in the process industry) to model the system and to design diverse control strategies.

2 Objective of the control system The objective of the control system in a distributed collector field is to maintain the outlet oil temperature of the loop (or the highest outlet oil temperature reached by one of the collectors each sampling time) at a desired level in spite of disturbances such as changes in the solar irradiance level (caused by clouds), mirror reflectivity or inlet oil temperature. A fundamental feature of a solar power plant is that the primary energy source, solar radiation, cannot be manipulated.

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