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access icon free MPPT algorithm for thermoelectric generators based on parabolic extrapolation

© The Institution of Engineering and Technology
Received 20/12/2017, Accepted 22/03/2018, Revised 05/03/2018, Published 23/03/2018

In this study, a maximum power point tracking (MPPT) technique based on parabolic extrapolation has been presented for thermoelectric generator systems. Conventional MPPT methods require a closed-loop controller and perturb and observe (P&O) method to provide fast-tracking response. However, they produce power loss due to small oscillations in the steady state. The proposed method excludes the use of closed-loop controller and steady-state oscillations by directly estimating the coordinates of MPP using three random operating points on the parabolic P–I curve. To substantiate the effectiveness of the parabolic extrapolation-based MPPT algorithm, different conditions of temperature gradient and load have been applied. The results demonstrate that the proposed algorithm takes <15% of the time taken by P&O method to track the MPP.

Inspec keywords: thermoelectric conversion; closed loop systems; maximum power point trackers; extrapolation

Other keywords: MPPT algorithm; steady-state oscillations; maximum power point tracking technique; closed-loop controller; thermoelectric generator systems; perturb and observe method; parabolic extrapolation; parabolic P-I curve; temperature gradient; random operating points; P&amp;O method; fast-tracking response; power loss

Subjects: Control of electric power systems; Interpolation and function approximation (numerical analysis); Interpolation and function approximation (numerical analysis); DC-DC power convertors; Other direct energy conversion; Numerical approximation and analysis; Thermoelectric conversion

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