Performance Fuzzy Logic Control to Minimize Output Voltage Ripple and Balanced Current Distribution of DC-DC Converters in Parallel Non-Identical

Abstract

Analysis of DC-DC converters arranged in parallel with different inductor parameters is discussed in this paper. Buck DC-DC converter uses a non-identical model, where the inductance values differ, i.e. L1 not equal to L2 not equal to L3. Research techniques are based on the difference of current flows of each converter, i.e. I1 minus I2 and I1 minus I3, with the reference current being I1. These current difference results are used as input for the controller. PID and Fuzzy Inference System with 5 gbell membership functions are used as controllers. The results of this study indicate significant system performance. The output voltage ripple is 10 millivolts with the total output current of 63.7 amperes. Each DC-DC converter provides a contribution current to the load of 21.28 amperes. The current distribution difference of each converter module ranges from 1 to 4 milliamperes RMS (root mean square) using PID control, while using Fuzzy Logic Control, the current distribution difference is 0.1 milliamperes RMS and the output voltage is 48 volts. Fuzzy Logic Control performance has shown an improvement of control systems to reduce the output voltage ripple and the ability to share load current equally among each DC-DC converter.