Control with excess actuators (1): load balancing, split range, override

Antonio Sala, UPV

Difficulty: *** ,       Relevance: ,      Duration: 18:58

*Enlace a Spanish version

Summary:

This video discusses strategies for control structures with one “controlled” and two “manipulated” variables. The first three minutes motivate the problem by introducing practical examples of where these ideas may apply (exchanger with bypass, neutralization, heating in stages,…), and proposes that there are two major divisions of the strategies to solve the problem: (a) those with a single controller in operation, and (b) those where a secondary setpoint for a secondary controlled variable is generated and, hence, there are two active controllers.

In this first video, the first option (a single active controller) is discussed, and the structures of load balancing, split range, and override (two controllers, but only one active in emergencies) are explained. Really, override is a bit ’in the middle’ and, depending on opinions we could say that there is one loop or two loops

A second video [dosact2EN], a continuation of this one, explains the strategies with secondary loop (cascade, gradual, …).

*Link to my [ whole collection] of videos in English. Link to larger [ Colección completa] in Spanish.