Contribution of fuzzy logic to control an industrial process

The fuzzy logic as a basis for control method for nonlinear control systems is introduced. One of the main issues to be handled in MIMO controllers is the decomposition method to be adopted. After controller analysis there are discussed two approaches to the decomposition method of MIMO fuzzy logic based controllers (FLC) to be applied in a complex multivariable process. The paper describes the parallel operation of uninterruptible power supplies (UPS) as target application, showing its MIMO characteristic, with high cross coupling, and containing parameters with some level of uncertainty. Simulation results are presented for two controller types validating the proposed approach