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Sepic Converter: Comparison of Cascade and External Control

10.24050/reia.v23i45.1905
Published 2026-01-01
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Abstract

This paper detailed a comparative study between two analog control techniques: direct control and cascade control applied to the output voltage regulation of a SEPIC. The research developed the model of the converter in the state-space domain, derived its small-signal transfer functions and designed PID controllers based on the pole-placement method such that the dynamic response was optimized. Furthermore, the examined system functions at a nominal power of 3.2 kW which makes it a promising option for distributed power generation systems. All simulations were done in Matlab® / Simulink™ software platforms. The two control strategies were designed for a switched model of the converter with distributed components that more closely represent the behavior of the hardware. The evaluations make it clear that cascade control will reject DC input voltage disturbances better than direct control. It was observed that under static operating conditions, the controlled system had a 10 ms settling time which met the performance requirements. Additionally, it decreased the inductor L1 current overshoot during output signal transients, by 68.92%. The results demonstrate cascade control's effectiveness in diminishing perturbations and improving system stability. Ultimately, the work demonstrated cascade control as a viable and efficient regulation solution with a significantly improved dynamic response and a more consistent operating reliability of the SEPIC converter.

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Arany, R. R., & Bratcu, A. I. (2017). Robust control of a single-ended primary-inductor converter (SEPIC). Proceedings of the 5th International Symposium on Electrical and Electronics Engineering (ISEEE), 1–6. https://doi.org/10.1109/ISEEE.2017.8170665

Åström, K. J., & Hägglund, T. (2009). Control PID avanzado. Madrid, España: Pearson Prentice Hall.

Åström, K. J., & Murray, R. M. (2010). Feedback systems. Princeton, NJ, USA: Princeton University Press. https://doi.org/10.2307/j.ctvcm4gdk

Ayachit, A., Reatti, A., & Kazimierczuk, M. K. (2016). Small-signal modeling of PWM dual-SEPIC DC–DC converter by circuit averaging technique. Proceedings of the 42nd Annual Conference of the IEEE Industrial Electronics Society (IECON), 3606–3611. https://doi.org/10.1109/IECON.2016.7793030

Bacha, S., Munteanu, I., & Bratcu, A. I. (2014). Power electronic converters: Modeling and control. London, Reino Unido: Springer. https://doi.org/10.1007/978-1-4471-5478-5

Chandan, B., Dwivedi, P., & Bose, S. (2019). Closed loop control of SEPIC DC–DC converter using loop shaping control technique. Proceedings of the IEEE 10th Control and System Graduate Research Colloquium (ICSGRC), 20–25. https://doi.org/10.1109/ICSGRC.2019.8837093

Elsayad, N., Moradisizkoohi, H., & Mohammed, O. (2021). A new SEPIC-based step-up DC–DC converter with wide conversion ratio for fuel cell vehicles: Analysis and design. IEEE Transactions on Industrial Electronics, 68(8), 6390–6400. https://doi.org/10.1109/TIE.2020.3007110

Gayen, P. K., Roy Chowdhury, P., & Dhara, P. K. (2018). Improved dynamic performance of a bidirectional SEPIC–Zeta converter-based battery energy storage system using adaptive sliding mode control. Electric Power Systems Research, 160, 348–361. https://doi.org/10.1016/j.epsr.2018.03.016

Geethalakshmi, B. (2015). Design of a closed loop control scheme for a DC–DC SEPIC converter using loop shaping method. Proceedings of the International Conference on Circuits, Power and Computing Technologies (ICCPCT), 1–5. https://doi.org/10.1109/ICCPCT.2015.7159361

Goudarzian, A., Khosravi, A., & Raeisi, H. A. (2021). A new approach in design of sliding-mode voltage controller for a SEPIC converter. International Journal of Dynamics and Control, 9(3), 1197–1209. https://doi.org/10.1007/s40435-020-00741-9

Hussain, J., & Mishra, M. K. (2015). Design of current mode controlled SEPIC DC–DC converter for MPPT control of wind energy conversion systems. Proceedings of the International Conference on Computation of Power, Energy, Information and Communication (ICCPEIC), 177–182. https://doi.org/10.1109/ICCPEIC.2015.7259460

Kanimozhi, G., Meenakshi, J., & Sreedevi, V. T. (2017). Small-signal modeling of a DC–DC type double boost converter integrated with SEPIC converter using state-space averaging approach. Energy Procedia, 117, 835–846. https://doi.org/10.1016/j.egypro.2017.05.201

Kircioğlu, O., Ünlü, M., & Çamur, S. (2016). Modeling and analysis of DC–DC SEPIC converter with coupled inductors. Proceedings of the International Symposium on Industrial Electronics (INDEL), 1–5. https://doi.org/10.1109/INDEL.2016.7797807

Mouslim, S., et al. (2020). Simulation and analyses of SEPIC converter using linear PID and fuzzy logic controller. Materials Today: Proceedings, 27, 3199–3208. https://doi.org/10.1016/j.matpr.2020.04.506

Mumtaz, F., et al. (2021). Review on non-isolated DC–DC converters and their control techniques for renewable energy applications. Ain Shams Engineering Journal, 12(4), 3747–3763. https://doi.org/10.1016/j.asej.2021.03.022

Nishat, M. M., et al. (2018). Modeling, simulation and performance analysis of SEPIC converter using hysteresis current control and PI control method. Proceedings of the International Conference on Innovations in Science, Engineering and Technology (ICISET), 7–12. https://doi.org/10.1109/ICISET.2018.8745619

Patarroyo-Gutiérrez, L. D., González-Niño, M. E., & Plazas, J. A. (2024). Convertidor SEPIC: modelado y control considerando pérdidas de energía interna. Ingeniería y Competitividad, 26(1). https://doi.org/10.25100/iyc.v26i1.13016

Polsky, T., et al. (2018). Transient and steady-state analysis of a SEPIC converter by an average state-space modelling. Proceedings of the IEEE 18th International Power Electronics and Motion Control Conference (PEMC), 211–215. https://doi.org/10.1109/EPEPEMC.2018.8522000

Poluthai, S., & Jirasuwankul, N. (2018). Simulation of a miniature SEPIC converter with PI controller for thermoelectric generator module. Proceedings of the International Electrical Engineering Congress (iEECON), 1–4. https://doi.org/10.1109/IEECON.2018.8712248

Sel, A., et al. (2017). Comparative analysis of performance of the SEPIC converter using LQR and PID controllers. Proceedings of the International Conference on System Theory, Control and Computing (ICSTCC), 839–844. https://doi.org/10.1109/ICSTCC.2017.8107141

Sivakumar, S., et al. (2016). Assessment on performance of DC–DC converters for renewable energy applications. Renewable and Sustainable Energy Reviews, 58, 1475–1485. https://doi.org/10.1016/j.rser.2015.12.057

Sivamani, D., et al. (2021). Design and implementation of highly efficient UPS charging system with single-stage power factor correction using SEPIC converter. Materials Today: Proceedings, 45, 1809–1819. https://doi.org/10.1016/j.matpr.2020.08.744

Sree, B. L., & Umamaheswari, M. G. (2017). Modeling and control of solar power fed single-ended primary inductor converter using cascade control scheme. Proceedings of the Trends in Industrial Measurement and Automation (TIMA), 1–7. https://doi.org/10.1109/TIMA.2017.8064784

Ullah, M., et al. (2019). Design of linear quadratic regulator controller for SEPIC converter. Proceedings of the International Conference on Emerging Technologies (ICET), 1–6. https://doi.org/10.1109/ICET48972.2019.8994463

Verma, M., & Kumar, S. S. (2018). Hardware design of SEPIC converter and its analysis. Proceedings of the International Conference on Current Trends towards Converging Technologies (ICCTCT), 1–4. https://doi.org/10.1109/ICCTCT.2018.8551052

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