| Project/Area Number |
61550185
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械力学・制御工学
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| Research Institution | Nagoya University |
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Principal Investigator |
FUJII Seizo Nagoya University, Professor, 工学部, 教授 (20023038)
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| Co-Investigator(Kenkyū-buntansha) |
OGAWARA Yoichi Mitsubishi Heavy Industries, LTD., Manager, System Engineering Research Laborato, 技術本部システム技術部・システム技術総合研究
HAYAKAWA Yoshikazu Nagoya University, Assistant Professor, 工学部, 講師 (60126894)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥1,500,000 (Direct Cost: ¥1,500,000)
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| Keywords | Automatic Control / Control Application / Adaptive Control / Multivariable Control / Discrete Time Control System |
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| Research Abstract |
The purpose of this research is to develop a method of adaptive control in the temperature of superheated steam of power plant, by which the controller is adjusted automatically and the control performance is always kept at the optimum state for load changes in boiler. The following results are obtained.
1. A mathematical model is made for the temperature of superheated steam in a boiler.
2. Control behaviours using conventional PI controller are discussed for various load changes.
3. Gain-scheduled control system is also designed for load changes and is discussed.
4. Various methods of adaptive control are psoposed: classifying roughly, indirect method, direct method and bilinear model method.
As the indirect method, the following four control rules are considered:
(1) mimizing a quadradic performance function
(2) using compensators for known disturbances
(3) assigning poles of the control system
(4) predicting unknown output.
Moreover, a design method which takes account of an input saturation etc. is given.
5. Using a simulator of power plant, the above methods of adaptive control are discussed in detail. As a result, a method which gives a good response irrespective of load changes accompanied by variations in boiler characteristics are determined.
6. The control behaviours of the system in the case where a long operation is carried out are studied.
Consequently, when the load changes rampwise by 5%/min, the control error in steam temperature decreases by about 1/3 as compared with the conventional control method. In addition, when the load changes randomwise, the almost same control performance is obtained. The experiment in actual plant is expected.
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