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Studies on photovoltaic (PV) arrays have demonstrated that some arrays suffer from mismatch power losses even under uniform illumination. This mismatch power loss that is attributed to the inequality of characteristic parameters between a PV array's modules is conventionally addressed by sorting techniques — which stands for sorting PV modules in an array by one of their characteristic parameters...
Partially shaded conditions are common in all kinds of PV systems. The mismatch phenomenon of a Solar PV array, such as partial shade, not only affects the power generated by solar system, but also leads to safety and reliability problems. This paper proposes a new shading degree model-based self-adaptive reconfiguration method to reduce the effect of shadows on solar arrays. A switching matrix dynamically...
While most of the current maximum power point tracking (MPPT) algorithms for large photovoltaic systems are complicated and inefficient, this paper proposes a novel method of MPPT specially used in small-scale photovoltaic LED lighting systems. The proposed algorithm is based on the improved research on the characteristics of the PV array in novel lighting systems. The proposed method in the special...
The output power of photovoltaic (PV) power generation system is the nonlinear function of insolation, temperature and load, and thus the perturbation step of perturbation and observation (P&O) method should be regulated according to PV module working condition to improve the MPPT effect. P&O with fuzzy control, which can implement variable perturb step control, has good control effect, however...
A novel MPPT method, which adjusts the perturbation step according to the work point of photovoltaic (PV) module, is proposed to reduce the power oscillation around MPP. There is the nonlinear relation between the output power of photovoltaic module with temperature and load. The perturbation step is constant in traditional perturbation and observation (P&O) MPPT method. There is serious power...
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