Abstract
A new procedure based on the Relative Gain Array (RGA) is proposed for screening of control structures. In addition to the RGA for the full open-loop system, the RGA for the system under partial control is considered. This Partial Relative Gain (PRG) provides necessary conditions for integral controllability and integrity. The PRG also solves the variable pairing problem in decentralized control more reliably than the conventional RGA, which may fail or be ambiguous for systems larger than 2×2. Furthermore, it can be inferred from the PRG when block-decentralized control should be considered.
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