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The output of photovoltaic array under uniform light is nonlinear with single peaks. Among the MPPT strategies, The P&O Maximum Power Point Tracking algorithm is mostly used, due to its ease of implementation. However, its main drawbacks are the waste of energy in steady conditions, when the working point moves across the MPPT and the poor dynamic performances exhibited when a step change in solar irradiance or in temperature occurs. Because of this disadvantage, P&O based on variable metric method is proposed. Combining these two algorithms, use variable metric can automatic change the step-size during the process. Compared with the conventional fixed step size method, the proposed approach can effectively improve the MPPT speed and accuracy simultaneously. A theoretical analysis and the design principle of the proposed algorithm are provided and its feasibility is also verified by simulation.

MPPT Algorithm Based on the Perturbation and Observation with Variable Metric