摘要： Nowadays, to response to the demand of a high rate renewable energy penetration in the electricity grids, the installation of many new large-scale photovoltaic systems up to more than 100 MW is unavoidable. However, in many countries, there is a serious lack of space for these large-scale projects. As the authorities wish to avoid taking away many farmlands for ground-mound photovoltaic systems, we must find acceptable ecological alternative solutions. One of the solution is the linear photovoltaic systems due to the availability and ready to use of the linear space: bike path, along the pavement of a road, along the edge of a highway… Another interesting method is the installation of floating PV power plants on inland water bodies. The possibilities and opportunities of these new kinds of large-scale PV plants are infinite. However, their installations meet a lot of challenges, such as the loss due to new structures and environments, the cost of equipment, the compatibility of the new PV plants with the initial function of the surface… To study these challenges, an effective simulation tool is essential. Considering the importance of the simulation tools, this paper proposes an improved PV system simulation model based on the two-diode model and a fast, comprehensive method to simulate the PV system in long term with a huge volume of the MATLAB/SIMULINK in environment.