Voltage Regulation of Auxiliary Power Units for Electric Vehicle Applications Using Fuzzy Logic Controller

• Published in: IEEE access 2024, Vol.12, p.107583-107598
• Main Authors: M, Abishek, N, Amutha Prabha, Kumar Goyal, Jitendra
• Format: Article
• Language: English
• Subjects: Auxiliary power unit (APU); Capacitors; electric vehicles (EV); Fuzzy logic; fuzzy logic controller (FLC); Inductors; PI control; proportional integral (PI) controller; single-input dual-output (SIDO) converter; single-input triple-output (SITO) converter; Switches; Transient analysis; Voltage control
• ISSN: 2169-3536; 2169-3536
• DOI: 10.1109/ACCESS.2024.3439106

This paper proposes a new design methodology to regulate the output voltages of auxiliary power units in an electric vehicle application. The proposed method includes designing and implementing a robust fuzzy logic controller to load variation and input voltage fluctuation. The existing output voltage regulation techniques for auxiliary power units comprise a proportional-integral controller, which fails to provide good transient performance concerning load variation and input voltage fluctuation. To overcome the drawback of the existing technique, thereby improving transient performance, a proportional-integral controller is replaced by a fuzzy logic controller. This paper addresses a detailed analysis of comparing the proportional-integral and fuzzy logic controllers to segregate and utilize the best among them based on their performance. In addition, the issue of cross-regulation is also eliminated for the proposed design. Also, the proposed design involves the use of a single-input triple-output converter of a 100 W prototype which is designed to furnish three output voltages 24 V, 14.4 V, and 5 V to supply the auxiliary power units of an electric vehicle. To validate the effectiveness of the proposed approach, simulation is conducted on the MATLAB/Simulink platform, and the quantitative results of the proposed design, which include output voltage ( V_{o_{1}} ) =24 V, rise time ( T_{r} ) =0.02 sec, and steady-state error ( e_{ss} ) =0, are better than the existing values: output voltage ( V_{o_{1}} ) =23.4 V, rise time ( T_{r} ) =0.345 sec, and steady-state error ( e_{ss} ) =0.6 V.