A Fuzzy Logical-Based Variable Step Size P&O MPPT Algorithm for Photovoltaic System
In order to solve the key problem of maximum power point tracking(MPPT)in photovoltaic sys-tem,an improved Perturbation&Observation(P&O)maximum power point tracking algorithm is proposed.The algorithm uses variable step size Perturbation&Observation MPPT algorithm(FP&O)based on fuzzy logic to o-vercome the limitations of tracking speed and steady-state accuracy associated with traditional P&O MPPT track-ing method to improve the transient response and reduce the steady-state terminal voltage oscillations.The pro-posed MPPT algorithm is simulated to verify the effectiveness and feasibility of the algorithm by MATLAB.The simulation results show that the variable step size P&O MPPT algorithm based on fuzzy logic takes into account both tracking speed and steady-state accuracy compared with the traditional MPPT algorithm,the system re-sponse speed is faster,the average output power is higher and the power oscillation range is smaller,and the dy-namic and static performance of photovoltaic system is improved.
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