2019 Volume 16 Issue 18 Pages 20190461
This paper proposes a new maximum power point tracking (MPPT) control strategy, including a boost converter temporary stopped running (TSR) strategy and an advanced three-point weight comparison method (ATPWC). The proposed ATPWC was used to detect three power points of a photovoltaic (PV) module output, and a microcontroller unit (MCU) was used to calculate the slope of the three power points and to perform MPPT so as to improve the system’s conversion efficiency. The proposed method was successfully applied to an independent solar power generation system, in which the PV module was connected to a boost converter and then connected in series with an inverter to a single-phase 110 VAC/60 Hz output and connected to the power grid. The measured results showed that, in terms of the TSR control strategy, when the system output met a load of 110 Vrms, TSR could reduce switching loss and conduction loss and result in a 10% higher overall system conversion efficiency than that of traditional control. In terms of the MPPT algorithm, actual measurements were carried out under an irradiance level of 100 W/m2∼700 W/m2. Versus traditional hill climbing (HC) algorithm, the efficiency of the proposed ATPWC was better.
