Abstract

This paper proposes a new maximum power point tracking (MPPT) scheme, based on perturb and observe concept, for a single stage PV water pump system working effectively under various environmental conditions. The selection of frequency step size is an important parameter for single stage solar water pump system. Larger step size may lead to a sudden drop in DC link voltage due to oscillations around the maximum power point. Smaller step size takes longer time to reach MPP or may get trapped at lower power point. The system may also fail under dynamic change of environmental conditions (particularly during rapid fall in solar irradiation). The proposed algorithm is able to identify the conditions under which DC link voltage may fall and operate the system at a point where it can work efficiently without halt of system. The detailed analytical, simulation and experimental results of this work under different environmental conditions are presented in this paper.

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