研究目的
To analyze the impact of household small-scale single-phase PV systems and large-scale three-phase PV power plants on power quality when they are integrated into large power grids, and to test the effects of capacitive and non-linear loads switching on power quality.
研究成果
PV systems switching can cause voltage sags, impulsive transients, and current distortion at the grid point, with grid connection impacts being much greater than off-grid impacts. The connection of grid-connected PV systems can effectively suppress the voltage sags and impulsive transients caused by loads switching and has an obvious inhibition effect on the DC offset caused by capacitive loads switching.
研究不足
The study focuses on the impact of PV systems switching and different nature loads switching on power quality but does not explore the optimization of these impacts or the potential for integrating advanced control strategies to mitigate power quality issues.
1：Experimental Design and Method Selection:
The study builds a microgrid simulation system to analyze the impact of PV systems switching and different nature loads switching on power quality.
2：Sample Selection and Data Sources:
The system includes small-scale PV power generations, large-scale PV power plants, different nature loads, and infinite power grids.
3：List of Experimental Equipment and Materials:
PV units assembled to the Low Voltage AC bus via single or three-phase inverter, with a total installed capacity of about 47 kW.
4：Experimental Procedures and Operational Workflow:
Experiments consider the effect of power quality through switching capacitive loads and nonlinear loads when cutting out and inputting PV systems.
5：Data Analysis Methods:
The study uses root mean square (RMS) values to monitor sags, defines unbalance voltage factors (UVF), and calculates total harmonic distortion (THD) to characterize the degree of distortion of the waveform.
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