SOME INVESTIGATION OF MPPT CONTROL IN GRID CONNECTED PV SYSTEM

Photovoltaic (PV) arrays are used in many terrestrial applications. It has a nonlinear IV characteristic in which the production of electrical energy depends on prevailing conditions such as solar radiation and temperature. For optimal utilization, the maximum power point tracking (MPPT) algorithm technique should be properly implemented to operate the PV array at the maximum power point (MPP). As mentioned above, it is important to note that the MPP changes under different conditions in relation to the PV array properties. A detailed simulation model of the PV array was developed in MATLAB using the most popular MPPT incremental conductivity algorithm. This model allows PV generators to be characterized with different temperatures and insulation as variable parameters. Parameter variation under Nagpur conditions is also taken into account. The results of the model are the I-V and PV characteristics, voltage, current and power at MPP of the PV array simulated by MATLAB. Simulation results are displayed and analyzed. This paper, explored some MPPT operating procedures. For general investigation we started simulation of PV system connected to load and understand merits and demerits of it. After understanding the drawback we perform further simulation with MPPT and Inverter control to obtain maximum power transfer and stable voltage for non critical load. Broadly, simulation circuit consist of PV module, MPPT, Boost converter, Inverter, LCL filter, RL load and Single phase grid. Study of different methods and algorithm of MPPT enhance our understanding about how PV system reacts on them and change in stability of whole circuit in the motive to get better efficiency and also fulfill basic and overall requirement of PV system.We had done details analysis on incremental conductance method which is widely use and has more inclination in PV system.