Fuzzy Logic Sequence Control for Batch Sugar Centrifugal Machines

Abstract

This study is searching for a solution to the rapid oscillation of the current which happened due to the cyclic operation of the batch sugar centrifugal machines, the current oscillation affects the stability of electrical generation produce by steam turbine alternators at ASSALAYA Sugar Factory power station, the solution is focus on sequencing these sugar machines. Fuzzy logic control and Matlab Simulink are used to make a model of three batch sugar machines, the data is taken from Broadbent C46M batch centrifuge at Assalaya sugar factory, and the model represent the current behavior of the machines under working. Organizing the operation of these machines with sequence control is done by selecting the suitable delay time between machines, and this is done when the centrifuge M/C requesting permission from the sequence control to accelerate to the high speed. Two parameters in fuzzy logic control is used to obtain the desired delay time, the first parameter is depending on the previous machine spinning time duration and the second depend on the time taken between the previous machine get a permission until the current machine requesting permission from sequence control. When the default values of feed time, spin time & plough time are taken equal to (20s, 40s & 20s) respectively to and be identical for three machines, the total current oscillation has been minimized to 43.75% (compared with peak oscillation of only one machine) and in repeated form, and the total current of the three machines is being less than the current one machine. And in other cases when these parameters has different values the sequence control program also regulate the operation of the machines and the total current not exceed the current taken by one machine