Multi-factor Sensitivity to Power Quality of Power Electronic Distribution Systems

With the reduction of the price of photovoltaic (PV) panels and policy support, more and more PV power generation is being integrated into the grid. As PV inverters use power electronic devices, they will introduce harmonics into the grid, which can easily cause waveform distortion and equipment damage. At the same time, extensive access to PV can easily cause power back-feeding problems, resulting in over-voltage at the grid-connected point. It is very important to study the impact of PV parameter access on power quality at grid-connected points. However, the current research focuses on the impact of a single parameter, while in practical applications, the impact of PV access to power quality at the grid point of common coupling (PCC) varies due to different environments, installation locations, and so on. Therefore, this paper compares the effects of different irradiances, line impedance, and control parameters on total harmonic distortion (THD) and grid-connected point voltage under ideal and background harmonic scenarios through simulation experiments, and derives the parameter variation rules that are conducive to the reduction of THD and the control voltage in the stable domain. In the practical application, it can be used to guide the power quality improvement of grid-connected points.