Research on Photovoltaic MPPT Control Based on Variable Step Conductance Increment Method
Photovoltaic cells have multiple peak states under different light intensity and ambient temperature.In order to en-sure that the photovoltaic cells output the maximum power when the external environmental conditions change,the P-U characteris-tic curve is used to optimize the step size of the conductance increment algorithm,and the dynamic step size is modified by using the current-related coefficients.The slope of the P-U characteristic curve is adopted as the dynamic step size.The slope of the P-U curve is larger far away from the maximum power point,so that the fast tracking can be achieved with a larger step length.The slope of the P-U curve is smaller near the maximum power point,so that the steady-state oscillation of the system can be reduced with a smaller length.In order to verify the effectiveness of the improved variable step conductance increment method,a simulation model is built in Matlab/Simulink and compared with the traditional control algorithm.The results show that the algorithm can quickly and accurately track to the maximum power point of the photovoltaic cell and reduce the oscillation amplitude of the system at the maxi-mum power point.
photovoltaic cellmaximum power trackingstep size optimizationimproved conductance increment method
万方数据
维普
