The Kun-Shun University(KSU) has installed photovoltaic(PV) generator system in green office since 2010. The system consists of two different solar cell systems. One is multi-crystalline silicon photovoltaic modules, and the other is CIGS thin film (PV) modules. The thesis uses a useful analysis tool for such system under actual operation process. Thus the KSU-PV system is taken as an example to examine different conditions such as shading, and changes operating points of cell. Furthermore, it is also used to simulation control of PV systems, voltage, current, and power calculation. The main issue is devoted to the simulation of the grid-connected PV system application. Finally, comparisons of the simulation results and actual field test are also presented in this thesis.