A new approach to decentralised, process control using passivity and sector stability conditions

A new robust decentralised process control strategy based on the sector sta bility theorem is proposed in this paper. The interaction between sub-syste ms is measured by a revised passivity index, which is used in the developme nt of a new stability condition for decentralised control. The controller s ynthesis method is developed to satisfy the stability condition and H-infin ity performance specification. The decentralised control of a boiler furnac e is studied as an application example.