(497e) Distributed Safeness Index-Based Predictive Control for Enhanced Process Operational Safety
AIChE Annual Meeting
Wednesday, November 1, 2017 - 9:24am to 9:45am
In this work, we investigate the development of sequential and iterative distributed Safeness Index-based LEMPC designs. Due to the hard Safeness Index-based constraints that require the EMPC to maintain the process state within a region where the Safeness Index is below a given threshold, the distributed Safeness Index-based LEMPC design poses unique feasibility challenges that suggest that inputs should be partitioned such that those inputs that most affect the value of the Safeness Index are computed by one distributed controller. Feasibility considerations also affect the order in which the distributed controllers are recommended to be evaluated in a sequential distributed Safeness Index-based LEMPC design. Implementation strategies for both sequential and iterative distributed Safeness Index-based LEMPC are developed that are proven to maintain closed-loop stability in a bounded region of state-space and to always drive the closed-loop state into the region in state-space where the Safeness Index is below a threshold whenever it exits this region. A chemical process example is used to demonstrate the proposed control designs.
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