Genetics Algorithm for Setting Up Look Up Table in Parallel Mode of Series Motor Four Quadrants Drive DC Chopper

This paper presents the establishment of look-up table (LUT) for speed versus field current. LUT is necessary as an input reference for the close loop control of field current. The LUT was developed with the assistance of a genetic algorithm (GA). GA was used for optimization of the field current to maintain the motor torque for DC series motor running in parallel mode. Other than that, the LUT was employed when the FQDC was run in parallel mode for the purpose of climbing up a steep hill or slope. The simulation results using MATLAB/Simulink showed that the DC series motor with the assistance of LUT could overcome the drawbacks of DC series motor as speed decreases drastically when climbing a steep hill. In conclusion, the GA had successfully determined the best optimum field current to produce the highest torque to overcome load effect when tested using the proposed Four-Quadrant DC Chopper.