FUZZY CONTROLLER FOR MEDIUM-SCALE BIOMASS BOILER

The combustion in biomass boilers is classified as a non-homogeneous combustion process. This phenomenon is known as difficulty controllable by common control algorithms due to its inappropriate properties e.g. non-linear static characteristics, limitation of control variable quantity, transitions with a time delay or even behavior similar to non-minimal phase systems. Due to these properties the usage of traditional linear controllers leads to unsatisfactory results. The authors decided to use fuzzy controller with behavior similar to PID controller but with adaptation to most problematic properties of combustion process. The results were experimentally verified on a 100 kW biomass combustion boiler