MPPT ALGORITHMS USED IN PHOTOVOLTAICS

Abstract

Due to volatility of current-voltage characteristics of the photovoltaic module, MPPT algorithms are important element of photovoltaic power station. In most cases, MPPT algorithm controls power electronics converter, which receives power directly from one or more modules. Maximum power point changes its location together with insolation level temperature changes. There are also indirect, direct and artificial intelligence supported methods. Indirect methods are fractional methods and look-up table. Direct methods are Perturb & Observe and Incremental conductance. Direct algorithms are widely used, because of their ability to model maximum power point significantly better than indirect methods. Artificial intelligence supported methods obtain even better results in determining optimal operating conditions. Usage of these algorithms allows to increase the efficiency of energy production, and furthermore financial benefits. Investment payback time can also be shortened by using these methods, which are still being improved.