Abstract
Actuator nonidealities, such as backlash, dead zone, and others, present in a number of industrial systems, are known to severely degrade system performance. Providing nonconservative closed-loop robust performance guarantees for these systems in a consistent manner has been an open problem. For example, in boiler/turbine units, the turbine valve position actuation for manipulating steam flow rate is characterized by a small mismatch between the turbine valve command and the actual valve position, producing a small steady-state regulation error in the plant outputs. The standard linear S\mathcal {H}-{\infty } controller designed to provide zero steady-state error regulation drives this error to zero, producing the undesirable oscillations in the control signals and the plant outputs. This paper develops a nonsmooth \mathcal {H}-{\infty } output regulator theory addressing this problem and applies this theory to the experimentally validated boiler/turbine model with actuator dead zone. The simulation results showing a considerable performance improvement are given.
Original language | English (US) |
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Article number | 7055314 |
Pages (from-to) | 2117-2128 |
Number of pages | 12 |
Journal | IEEE Transactions on Control Systems Technology |
Volume | 23 |
Issue number | 6 |
DOIs | |
State | Published - Nov 2015 |
Keywords
- Actuators
- H∞ control
- boiler-turbine control
- dead zone
- nonsmooth nonlinearities
- robust performance.
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering