**1. Introduction**

The maximum power point tracking (MPPT) plays a major role in photovoltaic (PV) power system. The PV power generation changes with respect to sun light irradiance and temperature [1]. Nowadays, many researches develop different MPPT techniques for improving the MPP in PV system. There are two major classifications such as indirect and direct MPPT controllers [2]. The indirect MPPT techniques are used for offline analysis of PV system performance, while the direct MPPT techniques are used to measure PV voltage and PV current during online condition. In this chapter, the direct method has been developed by using fuzzy logic controller to track the MPP of PV system [3]. This method is very robust and easy; meanwhile, no mathematical model is required for designing the controller. In this chapter, MPPT algorithm has been tested with numerical simulation in MATLAB environment, and the PV performance at constant and variable irradiance as well as temperature has been analysed [4].

© 2016 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. © 2018 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
