PERFORMANCE ASSESMENT OF GRID-INTERACTIVE SOLAR PHOTOVOLTAIC ROOF TOP SYSTEM

In this paper, a study and analysis is done for the expenditure and payback period of approx. 28KW roof top based solar energy system based on a urban plot of size 35*90 feet located in omaxe colony Bathinda. A solar array of size 22 series and 5 parallel combinations is designed in AutoCAD consisting of total 110 panels. Different expenditures like panel cost, inverter cost, cables, Combiner box ,junction boxes, Maintenance cost and Installation cost are calculated for 28KW roof top system which comes out to be 1826000 Indian rupees. After providing the power to the major home appliances, payback period calculated is 5 years 11.5 months approx. Simulation of the proposed system is carried out using Matlab in which for MPPT improvement, perturb observe-method has been implemented for photovoltaic energy systems. Proposed method considers current and previous power comparisons to evaluate the coming duty cycle for IGBT pulses. It has been found that, the proposed system not only reduces the fluctuations in the system but also achieve initial power point tracing earlier than the traditional perturb observe method. It has been found that the presented MPPT technique attains optimum value after .3 seconds of the start of the system in ideal conditions an attains the maximum power limit forever if similar weather conditions are prevailed by the system. The experimental results of outcomes of the simulated system are shown in terms of power, current and voltage waveforms