Atom Search Optimized FOPI Controller of the DC–DC SEPIC Model with Matignon’s Theorem Stability Analysis

Abstract

In this work, the design and implementation of an optimized fractional-order proportional-integral (FOPI) controller for a DC–DC single-ended primary inductance converter (SEPIC) is considered to fulfill the application of power factor correction and voltage regulation along with improved robustness, efficiency, and performance characteristics of the converter. An Atom Search Optimization technique is proposed to optimize the parameters of the controller in the outer voltage and inner current control loop of the DC–DC SEPIC model. The model is developed using MATLAB –Simulink, and the simulation analysis is carried out at rated load, setpoint tracking, source voltage, and load variation. The effectiveness of the proposed atom search optimized FOPI controller is verified by comparing its performance with the particle swarm optimized FOPI controller. Furthermore, Matignon’s theorem-based closed-loop stability analysis is carried out for the tuned values of the FOPI controller with the SEPIC model. According to the simulation results, the proposed technique provides a more dominant dynamic response, an improved efficiency, and a power factor than the particle swarm-tuned controller of the SEPIC model. In addition, better voltage regulation is achieved in the case of source voltage and load variation. Furthermore, the closed-loop stability analysis reveals that the proposed Atom Search Optimization-tuned FOPI controller performance is more stable than the particle swarm optimization method. The hardware-in-the-loop implementation is carried out to validate the proposed controller in real-time.

Keywords:

• Atom search optimization
• Fractional-order proportional integral
• Matignon’s stability theorem
• Power factor correction
• Single-ended primary inductance converter
• Voltage regulation

Additional information

Notes on contributors

Maheswari Sepperumal

Maheswari Sepperumal received her bachelors in electronics and communication engineering from Mahendra Engineering College, India, in 2003. She received her Master of Engineering in power electronics and drives from Kumaraguru College of Technology, India, in 2005. Since 2017, she has been pursuing her PhD in power electronics and drives from Anna University, Chennai, India. Her research areas include the design of robust controllers for the DC–DC converter.

C. B. Venkatramanan

C B Venkatramanan received his AMIE degree from the Institution of Engineers India in 2001 and Master of Engineering in power electronics and drives from Anna University Chennai, India, in 2007, and a PhD from Anna University Chennai, in April 2014. He is an associate professor in the Department of Electrical and Electronics Engineering, having 9 years of industrial and 20 years of teaching experience. He has published 12 papers in international journals and 15 papers in national journals. He has authored textbooks on Control Systems. His area of specialization is power electronics and drives. Email:[email protected]

Arangarajan Vinayagam

Arangarajan Vinayagam has more than 15 years of industrial experience in power plant industry and renewable energy technologies. He has additional Academic experience (teaching and research) covering the smart grid and microgrid power systems, renewable energy technologies, power generation and distribution control, distributed generation sources, and power quality. He is a member of IEEE and has published more than 30 research articles in reputed journals, book chapters, and international conferences. The research interests include the development of a smart microgrid power system with integrated solar PV and energy storage facility, extensive analysis of power quality and electrical faults in microgrid and large grid power system network. He has completed PhD, a doctoral degree (in PV integrated microgrid power systems) at Deakin University, Australia. Presently, he is working as visiting professor in the Electrical and Electronics Engineering Department of New Horizon College of Engineering, Bengaluru, India. Email:[email protected]

Veerapandiyan Veerasamy

Veerapandiyan Veerasamy (Member, IEEE) received his bachelor’s degree in electrical and electronics engineering from Panimalar Engineering College, Chennai, India, in 2013, Master of Engineering in power systems engineering from Government College of Technology, Coimbatore, India, in 2015. Since 2015, he has been working as assistant professor in the Department of Electrical and Electronics Engineering, Rajalakshmi Engineering College, Chennai, India. He has completed his PhD in power systems from Universiti Putra Malaysia, Malaysia, in 2021. Currently, he is a research fellow at Nanyang Technological University, Singapore, whose research area includes the design of robust controllers, distributed and decentralized control, fault classification, power flow analysis, and recurrent neural network. Email:[email protected]