Abstract
Aware of the fact that the installed PV capacity and its power production rapidly increased in the last decade, with the huge impact that has been done to the power system, the distortion effects for grid-connected PV systems with reference to different types of electric power quantities will be presented in this article. The impact of the frequent fluctuation of solar irradiance on the behavior of the grid-connected PV system, due to cloud movements and resulting shadows and in terms of power quality and the evaluation of power components, is the topic of analysis in this research. Besides the simulation results of certain study cases, an experimental evaluation of electric power quantities on an actual PV system in real weather conditions was also performed. The experimental setup, formed through the combination of a PC and multifunctional I/O board with an appropriate software solution, was established and used for obtaining the target results. The methodology used for the evaluation of electric power quantities relied on the current physical components (CPC) theory for power definition. The experimental results were obtained for three different cases, namely, the low, medium, and high solar irradiance cases. On the basis of these results, the conclusions about distortion effects are given.
Highlights
Academic Editor: Andrea BonfiglioIn the last decade, the installation and production of photovoltaic (PV) systems have been increasing every year
The MPPT function performs a constant change in the DC voltage level, which causes a change in the transfer function of the inverter and affects the generation of harmonic distortions of the current at the output terminals of the inverter
Power quality issues and the hosting capacity issue will be the major tasks of future research
Summary
Academic Editor: Andrea BonfiglioIn the last decade, the installation and production of photovoltaic (PV) systems have been increasing every year. The conducted research and technology improvement have led to rapid progress in increasing the efficiency of photovoltaic modules and their optimization on the production of energy through better utilization of incident solar irradiance. The variable power flow, due to the fluctuation of solar irradiance (cloud movements and resulting shadows), temperature, and the topology of power converters are some of the parameters that affect the power quality of photovoltaic systems. These fluctuations can cause adverse effects, such as over/under-voltage issues, reverse power flow, and power quality issues [2]. Different mitigation methods have been developed and proposed for overcoming this issue, such as the local control of reactive power, use of volt-var control strategies, more efficient inverters, additional storage units, and the implementation of predictive control techniques
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