IEEE Access (Jan 2024)
Voltage Regulation of Auxiliary Power Units for Electric Vehicle Applications Using Fuzzy Logic Controller
Abstract
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.
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