Abstract
Owing to the good trade-off between implementation and performance, fixed-step direct maximum power point tracking techniques (e.g., perturb and observe and incremental conductance algorithms) have gained popularity over the years. In order to optimize their performance, perturbation frequency and perturbation step size are usually determined a priori. While the first mentioned design parameter is typically dictated by the worst-case settling time of the combined energy conversion system, the latter must be high enough to both differentiate the system response from that caused by irradiation variation and match the finite resolution of the analog-to-digital converter in case of digital implementation. Well-established design guidelines, however, aim to optimize steady-state algorithm performance while leaving transients nearly untreated. To improve transient behavior while keeping the steady-state operation unaltered, variable step direct maximum power point tracking algorithms based on adaptive perturbation step size were proposed. This paper proposes a concept of utilizing adaptive perturbation frequency rather than variable step size, based on recently revised guidelines for designing fixed-step direct maximum power point tracking techniques. Preliminary results demonstrate the superiority of the proposed method over adaptive perturbation step size operation during transients, without compromising the steady state performance.
Highlights
Energy produced by a photovoltaic generator (PVG) is mainly dependent on a single parameter: Solar irradiation
[44,45], this paper proposes the step size at value,results as dictated by the fixed-step algorithm design guidelines
In-depth investigation is left for future work, as only the concept of variable perturbation frequency is introduced here
Summary
Energy produced by a photovoltaic generator (PVG) is mainly dependent on a single (referred to as the "energy generating") parameter: Solar irradiation. It is to note that the proving that the maximum perturbation frequency should be designed at versions the short-circuit operating performance similarity of fixed step direct non-model-based algorithms have been revealed point while the the minimum perturbation size should be MPPT designed at the maximum point,. Onthe the maximum other hand,perturbation applications of direct non-model refined above upon design guidelines, proving frequency should be based with aoperating perturbation period lower thanperturbation the settling time theshould systembe designed atalgorithms the short-circuit point whilemuch the minimum step of size response were reported in References. Proposed the design-guideline-imposed values of the perturbation frequency steady state,initialization while maintaining technique has the ability of accelerating the transients caused by in either system away the step size minimum value, changes as dictated by the fixed-stepaccuracy algorithm design guidelines. A review of aPVG properties is briefly given in results superioritydynamics of the proposed approach over 3
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