Abstract—
Maximum power point (MPPT) tracking is essential for Photovoltaic (PV) systems to ensure the highest power output of PV arrays under any environmental condition. Comparing to other techniques, the Beta method shows advantages in terms of tracking speed, steady state performance, and simple implementation. However, the conventional Beta can be further improved by minimizing oscillations arounad the maximum power point (MPP) under steady state and increasing tracking speed in response to rapid changing of irradiance or temperature. An improved Beta-parameter based MPPT method is proposed in this paper to achieve the above objectives. An adaptive scaling factor is introduced and utilized in the MPPT mechanism, which enhances the tracking speed and is easily applied for any PV power system. Furthermore, the proposed method can identify and maintain the middle point of the three-level perturbations, which eliminate the oscillations at steady state. The control mechanism is not limited by specific operating conditions and illustrates superior performance over traditional methods with regards to transient response and steady state performance, which contributes to effective solar power harvesting. Followed by theoretical analysis, the simulation and experimental evaluation validate the claimed advantages of the proposed MPPT solution.
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