研究目的
To study the effects of THDi and THDv (Total Harmonics Distortion) on the life of distribution transformers and how harmonics generated by grid-connected PV systems affect these transformers.
研究成果
The simulation results indicate that higher harmonic injection in the system leads to increased THDi and THDv levels, which can reduce the lifespan of distribution transformers. Monitoring and controlling harmonic currents are essential to maintain power quality and extend transformer life.
研究不足
The study is based on simulation results using MATLAB/Simulink, which may not fully capture all real-world conditions and variations. The focus is primarily on the effects of harmonics on distribution transformers, without exploring mitigation strategies in depth.
1：Experimental Design and Method Selection:
The study uses MATLAB/Simulink version R2015b to simulate a grid-connected PV system and analyze the effects of harmonics on a distribution transformer.
2：Sample Selection and Data Sources:
A typical grid-connected PV system with a transformer rated 11/
3：4 KV, 100 KVA is considered. List of Experimental Equipment and Materials:
MATLAB/Simulink software (version R2015b) is used for simulation.
4：Experimental Procedures and Operational Workflow:
The simulation involves injecting harmonics into the system through a solar inverter and analyzing the current and voltage THD at the point of common coupling (PCC).
5：Data Analysis Methods:
Fast Fourier Transform (FFT) analysis is used to detect THDi and THDv.
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