Analysis and design of genetic algorithm-based cascade control strategy for improving the dynamic performance of interleaved DC–DC SEPIC PFC converter

  • C. KomathiEmail author
  • Umamaheswari Mallapu Gopinath
Original Article


Switched-mode power supplies used for powering new generation devices like microprocessors, utility grids and electric vehicles need to operate with faster dynamic response. This paper proposes cascade control technique using genetic algorithm to obtain the optimal proportional integral outer voltage and inner current controller parameters of interleaved DC–DC single-ended primary inductance converter for power factor correction in SMPS with fast dynamic response. The state space model of the interleaved DC–DC SEPIC converter is derived using state space averaging technique. The system is of higher order, and hence, the reduced-order model of the interleaved DC–DC SEPIC converter is realized using Hankel matrix approach to reduce the computational complexity in controller design. The optimal controller parameters are then obtained for the reduced-order system using genetic algorithm for improving the dynamic performance of the system. The performance of the closed-loop system is analyzed in terms of input power factor, % total harmonic distortion of source current, % efficiency and % load voltage regulation for variations in the line, load and reference voltage using Matlab/Simulink software tool. A prototype of the converter controlled by TMS320C2000™ microcontroller for an output power of 200 W is tested and validated with the simulation results.


DC–DC power conversion Voltage control Current control Harmonic distortion Modeling 


Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Electrical and Electronics Engineering, Rajalakshmi Engineering CollegeAffiliated to Anna UniversityChennaiIndia
  2. 2.Department of Electronics and Instrumentation Engineering, Sri Sairam Engineering CollegeAffiliated to Anna UniversityWest Tambaram, ChennaiIndia

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