Full operating range robust hybrid control of a coal-fired boiler/turbine unit - article no. 041011
Journal Article
·
· Journal of Dynamic Systems Measurement and Control
- University of Illinois, Urbana, IL (United States). Dept. for Engineering Science & Mechanics
Multi-input-multi-output robust controllers recently designed for the megawatt output/throttle pressure control in a coal-fired power plant boiler/turbine unit have demonstrated performance robustness noticeably superior to that of the currently employed nonlinear PID-based controller. These controllers, however, have been designed only for the range of 150-185 MW around the 185 MW nominal operating point, exhibiting a significant loss of performance in the lower range of 120-150 MW. Through system identification, the reason for this performance loss is demonstrated in the current work to be a pronounced dependence of the boiler/turbine unit steady state gains on the operating point. This problem is addressed via a hybrid control law consisting of two robust controllers and a robust switch between them activated by the set point change. The controllers are designed to cover the corresponding half-ranges of the full operating range. This permits attainment of the desired overall performance as well as reduction of modeling uncertainty induced by the operating point change to approximately 25% of that associated with the previous designs. Robust switching is accomplished through a novel hybrid mode of behavior-robustly controlled discrete transition.
- OSTI ID:
- 21073790
- Journal Information:
- Journal of Dynamic Systems Measurement and Control, Journal Name: Journal of Dynamic Systems Measurement and Control Journal Issue: 4 Vol. 130; ISSN 0022-0434
- Country of Publication:
- United States
- Language:
- English
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