A new MPPT technique for optimal and efficient monitoring in case of environmental or load conditions variation

Due to the very high initial investment cost of photovoltaic systems and their low conversion efficiency, it is essential to operate PV generators at the point of maximum power (MPP). Within this framework, our first objective in this thesis is to develop and improve the PV system, contributing to optimizing the PV panels' energy through a DC-DC power electronics converter. For this reason, a further improvement of the incremental conductance technique is proposed to improve the MPP tracking capability of the PV system when the level of solar irradiation is suddenly increased or when the load undergoes variations. The new technique includes two processing phases: a calculation phase to improve the tracking speed and a regulation phase to improve MPP tracking efficiency. In order to evaluate its performance, the proposed new method is compared to other methods, namely the Incremental conventional conductance (INC) technique and the Modified Variable Size Incremental conductance (M-INC) technique. The results show that the proposed technique's overall tracking speed is 3.7 times faster than the conventional INC technique and 1.52 times faster than the modified INC technique. Also, the tracking power losses with the proposed technique are lower compared to other techniques. In terms of overall efficiency, the proposed technique is the most efficient with an efficiency of 94.83%, followed by the modified technique with an overall efficiency of 87.94%. In comparison, the conventional INC technique's efficiency is the lowest and does not exceed 83.33%.

MPPT INCREMENTAL CONDUCTANCE TECHNIQUE FOR PV SYSTEMS

Electricity plays an important role in every aspect of life. Day by day as the digitalization is increasing the need of electricity is also increasing. Till now the production of electricity was totally dependent on conventional energy sources. But with increasing load demand these sources are getting exhausted rapidly. So, to reduce dependency on conventional energy sources we have already switched over to non-conventional energy sources which includes solar, wind, hydro, tidal etc. It is found that maximum electricity can be generated using solar energy. Various technologies are invented regarding the tracking of solar energies. Maximum power point tracking is the most popular technique among all which ensures the maximum use of solar energy to get converted into electricity. This paper represents one such method of MPPT i.e., Incremental conductance. The algorithm of incremental conductance with simulations result obtained in MATLAB is briefly discussed in this paper.

Implementation of an Improved Incremental Conductance MPPT Control Based Boost Converter in Photovoltaic Applications

The Photovoltaic systems have a slow dynamics of convergence toward the maximum power point (MPP), especially those equipped by the Boost converter based on the Conventional Incremental Conductance technique. This paper presents the simulation and hardware implementation of auto-scaling variable step-size MPPT in low cost and low power consumption μ-controller (PIC16F877A). Design and simulation of the proposed system are presented using ISIS PROTEUS. The two MPPT techniques, conventional IncCond method and variable step-size method are simulated in the ISIS PROTUES environment. The simulation results show the high tracking accuracy and fast speed convergence of the proposed method. Indeed, the experimental results are closely similar to those of simulation and also prove the advantages of the proposed technique, such as its reliability and accuracy in tracking the MPP. The suggested MPPT system reduces the complexity in implementation and cost of the photovoltaic systems.