Improved MPPT adaptive incremental conductance algorithm

In this work we study a new Improved Adaptive Incremental Conductance (IAIC) algorithm proposed originally by A. Morales-Acevedo for maximum power point tracking (MPPT). The maximum power point is searched by means of an adaptive correction of the DC-DC converter duty cycle which is determined by the sum of the incremental and the instantaneous conductance at a given time. The operating principle is first presented and then the performance evaluation is made using a MATLAB/SEVIULINK model of a photovoltaic system to be connected to the grid. This new algorithm helps in reducing possible power over-impulses during solar radiation transient periods. In addition, it has a good behavior under steady state conditions because oscillations around the maximum power point are reduced. The IAIC algorithm is also better than the conventional adaptive incremental conductance (AIC) algorithm since the MPPT tracking efficiency is higher for the former than for the latter. The IAIC algorithm is highly efficient (above 99.6%), it is simpler than the AIC algorithm and it can be implemented easily using a low cost micro-controller.