Multiobjective evolutionary algorithms for multivariable PI controller design

A multiobjective optimisation engineering design (MOED) methodology for PI controller tuning in multivariable processes is presented. The MOED procedure is a natural approach for facing multiobjective problems where several requirements and specifications need to be fulfilled. An algorithm based on the differential evolution technique and spherical pruning is used for this purpose. To evaluate the methodology, a multivariable control benchmark is used. The obtained results validate the MOED procedure as a practical and useful technique for parametric controller tuning in multivariable processes.

► We present a multiobjective optimisation design approach for PI controller tuning.
► The multiobjective approach allows analysing the trade-off among design objectives.
► The methodology is implemented in a multivariable process.
► An analysis of a Pareto front with several objectives is performed.
► It is possible to identify controllers with a desired trade-off.