Application of Model Reference Adaptive Control to Solar Thermal Utilization Systems

[+] Author and Article Information
Tadayoshi Tanaka

Electrotechnical Laboratory, 1-1-4 Umezono Tsukuba, Ibaraki, Japan

J. Sol. Energy Eng 112(2), 117-124 (May 01, 1990) (8 pages) doi:10.1115/1.2929643 History: Received March 03, 1988; Revised October 31, 1989; Online June 06, 2008


A proportional plus integral plus derivative (PID) controller is used to obtain usable energy from the sun in almost all the solar systems in Japan. However, it is difficult to collect the heat continuously close to a prescribed temperature using a PID controller because the solar radiation is often interrupted by passing clouds. We investigated, therefore, a Model Reference Adaptive Control (MRAC) system. In order to demonstrate its effectiveness, we constructed a MRAC system and introduced it into the collector loop of a solar system. This paper gives an outline of the MRAC algorithm and describes the experimental results for the outlet fluid temperature response of the loop by the MRAC and PID. From these results, it is shown that the MRAC algorithm is suitable for controlling a system affected by irregular disturbances in the insolation.

Copyright © 1990 by The American Society of Mechanical Engineers
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