Voltage stability and sensitivity analysis of grid-connected photovoltaic systems

Integration of significant amount of solar power challenges the power system stability operation. This paper presents analyses on the static and transient voltage characteristics at the point of common coupling of a grid-connected photovoltaic system. The static voltage response, known as a PV curve, for the photovoltaic system is analyzed. The voltage transient behaviors caused by the disturbance of parameters in photovoltaic generation system are also studied. In particular, we try to find out the impact of system parameters, such as temperature, solar irradiance, and load changes on the voltage stability. In addition, a method of voltage stability sensitivity analysis is presented for comparison between the impacts of different parameters on voltage stability.