Comparative study of variable size perturbation and observation maximum power point trackers for PV systems |
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Authors: | Neil S. D'Souza Luiz A.C. LopesXueJun Liu |
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Affiliation: | Department of Electrical and Computer Engineering, Concordia University, Montreal, QC H3G 1M8, Canada |
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Abstract: | Perturbation and observation (P&O) maximum power point tracking (MPPT) algorithms are common in photovoltaic (PV) systems due to its ease of implementation. However, operation with fixed size perturbations results in a trade-off between speed of response and maximum power yield in the steady-state. This paper discusses the use of Fuzzy logic and non-switching zone schemes for implementing variable size perturbations for improved transient and steady-state responses. The potential performance of four different P&O algorithms is investigated by means of simulations. Experimental results are then used to verify how the computational burden of each algorithm and the processing speed of a digital signal processor (DSP) affect the performance of each method in a prototype. The best performance is achieved with a new strategy called non-switching zones in the VPV × IPV plane. The power electronics converter operates with duty cycle (D) equal to 0 or 1, depending on which non-MPP region the system operates, pushing the operating point the fastest way possible towards the MPP region, for improved transient response. At the MPP region, a reduced Fuzzy P&O MPPT algorithm optimized for small variations around the MPP is used for reduced oscillations and increased power yield in the steady-state. |
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Keywords: | MPPT Photovoltaic Fuzzy Peak current control Variable size Perturbation and observation |
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