International Journal of Applied Power Engineering (IJAPE) Vol. 14, No. 3, September 2025, pp. 733~742 ISSN: 2252-8792, DOI: 10.11591/ijape.v14.i3.pp733-742  733 Journal homepage: http://ijape.iaescore.com/ Fractional order PID controlled hybrid Cuk converter for electric vehicle Nallamilli P. G. Bhavani 1 , S. Dinakar Raj 1 , K. Sujatha 2 , N. Navaprakash 1 , D. Ezhilarasan 1 1 ECE Department, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University, Chennai, India 2 EEE Department, Dr. M.G.R. Educational and Research Institute, Chennai, India Article Info ABSTRACT Article history: Received May 22, 2024 Revised Jul 7, 2025 Accepted Aug 3, 2025 Choosing the right controller with the right approach is one of any power converter's biggest concerns. In order to optimise induction heating, a hybrid Cuk converter with a fractional-order proportional integral derivative (FOPID) controller is built. The findings show an improved time domain responsiveness in the FOPID controlled closed-loop hybrid DC-DC converter (CDHC) system. In order to improve the interface between the resonant inverter and DC source and to step up voltage with less output ripple, Cuk converters are used. The research project is concerned with modelling and simulating a hybrid closed-loop DC converter system. The findings show an improved time domain responsiveness in the FOPID controlled CDHC system. The suggested approach offers advantages such as high-power density and buck boost capability. After being inverted, the Cuk converter's output is applied to a DC load. The time responses of the closed loop proportional integral (PI) and FOPID controlled homogeneous charge compression ignition (HCCI) systems are compared. The hardware is implemented and tested for the CDHC system for electric vehicles. The results indicate that the FOPID controlled CDHC system has enhanced time response and benefits such as high-power density buck boost ability. Keywords: Buck-boost capability FOPID controller Hybrid Cuk converter PI controller Power converter This is an open access article under the CC BY-SA license. Corresponding Author: Nallamilli P. G. Bhavani ECE Department, Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences (SIMATS), Saveetha University Chennai, Tamil Nadu, India Email: bhavaninpg.sse@saveetha.com 1. INTRODUCTION In recent years, the use of non-conventional energy sources has expanded across various applications, including domestic, industrial, and hybrid vehicle systems. Hybrid vehicles, in particular, require both AC and DC supply voltages to operate their equipment, making hybrid converters crucial components in these systems. These converters are essential for integrating energy sources through power converters to supply various types of loads in EV applications, including motor drives, auxiliary systems, and battery charging units, and boost-derived hybrid converters have been designed to accommodate different types of loads, whether AC or DC [1]. Previous research has proposed standalone synchronous reference control for switched boost inverters (SBI) [2], and conventional methods have relied on two discrete converters for each type of transformation (DC-DC and DC-AC) [3], [4]. However, advancements in Z-source topology have led to the development of prolonged boost Z-source inverters [4], and pulse width modulation techniques have been explored for optimizing SBI control strategies [5]. Moreover, the minimization of current ripple and voltage