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1. Advanced Control Strategy for Impingement Drying.

Author

Kokko, T., Lautala, P., and Huhtelin, T.

Subjects
*PAPER, *EVAPORATION (Chemistry), *DRYING, *DRYING agents, *CURING, *TECHNOLOGY
Abstract

This article examines dynamic behavior of impingement drying. Dynamic relations between the drying variables and the paper moisture are determined and interactivity between the process variables is defined. According to the results, impingement drying is interactive and therefore an advanced control strategy is developed which is based on multivariable model predictive control. The performance of the proposed control strategy is studied by simulation and the simulation results are compared with the simulation results of the present control scheme. [ABSTRACT FROM AUTHOR]

Published
2003
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2. Model predictive control of wind turbine fatigue via online rainflow-counting on stress history and prediction

Author

S Loew, Dragan Obradovic, and C L Bottasso

Subjects
Paper, History, Optimization problem, Computer science, PID controller, Turbine, ddc, Computer Science Applications, Education, Stress (mechanics), Model predictive control, Control theory, Wind regime, Rainflow-counting algorithm
Abstract

The standard fatigue estimation procedure is implemented in Model Predictive Control via externalization of the Rainflow algorithm from the optimization problem. Additionally, stress history is considered in a consistent manner by employing a so-called stress residue. The formulation is implemented in the state-of-the-art MPC framework acados and tested in closed-loop with the 5MW onshore turbine in OpenFAST. Simulation results indicate that the new formulation outperforms conventional PID- and MPC-controllers over the entire wind regime, and that the consideration of stress history is highly beneficial.

Published
2020
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