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Optimization based higher order sliding mode controller for efficiency improvement of a wave energy converter

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  • Suchithra, R.
  • Ezhilsabareesh, K.
  • Samad, Abdus

Abstract

This paper deals with the efficiency maximization of a wave energy converter (WEC). The WEC is an oscillating water column (OWC) device and drives a permanent magnet synchronous generator (PMSG) through a bidirectional flow impulse-turbine. The converter faces challenges such as large peak-to-average power ratio, low overall efficiency, and inefficient energy absorption for regular and irregular sea states. In this context, a higher order sliding mode controller (HOSMC) was proposed, and its gains were optimized to control through the best efficiency point tracking (BEPT) of the turbine. The flow through the turbine-passage was simulated by the computational fluid dynamics (CFD) technique, and the BEPT characteristics were obtained. An adaptive inertia-weight particle-swarm algorithm and a grouped grey-wolf algorithm were used for optimization. The Optimized HOSMC reduced chattering, minimized the reaching time and improved the mean efficiency by about 67% compared to the uncontrolled cases. In addition, the relative improvement of the mean efficiency was at least 4.8% compared to conventional controllers. The controller reduced the peak-to-average power ratio of at least 35.6% relative to the uncontrolled case of the turbine under different sea states.

Suggested Citation

  • Suchithra, R. & Ezhilsabareesh, K. & Samad, Abdus, 2019. "Optimization based higher order sliding mode controller for efficiency improvement of a wave energy converter," Energy, Elsevier, vol. 187(C).
    • Handle: RePEc:eee:energy:v:187:y:2019:i:c:s0360544219318067
    DOI: 10.1016/j.energy.2019.116111
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    References listed on IDEAS

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    Cited by:

    1. Kelkoul, Bahia & Boumediene, Abdelmadjid, 2021. "Stability analysis and study between classical sliding mode control (SMC) and super twisting algorithm (STA) for doubly fed induction generator (DFIG) under wind turbine," Energy, Elsevier, vol. 214(C).
    2. Das, Tapas K. & Kumar, Kumud & Samad, Abdus, 2020. "Experimental Analysis of a Biplane Wells Turbine under Different Load Conditions," Energy, Elsevier, vol. 206(C).

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