研究目的
To simulate, test, and implement a specific Phase Locked Loop (PLL) based on inverse Park transformation for controlling a PV-Micro-Inverter, focusing on better harmonics filtering.
研究成果
The SF-PLL based on inverse Park transform has been successfully simulated and tested using a 250W-PV micro inverter. The simulation and practical results validate the robustness of the proposed mathematical modeling, demonstrating its effectiveness in controlling a PV-Micro-Inverter under various grid disturbances.
研究不足
The study focuses on a specific type of PLL (inverse Park transformation PLL) and its application in controlling a PV-Micro-Inverter. The robustness of the PLL is tested under specific grid disturbances, but its performance under other types of disturbances or in different applications may require further investigation.
1：Experimental Design and Method Selection:
The study involves the simulation and testing of a SRF-PLL algorithm based on the inverse Park Transformation for controlling a grid-connected PV micro-inverter.
2：Sample Selection and Data Sources:
The grid signal is generated by a sin wave block according to European form, i.e., with a frequency of 50Hz and an amplitude of 230Vac.
3：List of Experimental Equipment and Materials:
MATLAB/SIMULINK for simulation, STM32F4 MCU for implementation, and a PV micro-inverter DC/AC power stage for testing.
4：Experimental Procedures and Operational Workflow:
The PLL is simulated under various grid disturbances (voltage distortion, harmonics, phase jump, and frequency variation) and then implemented in C language using a STM32F4 MCU.
5：Data Analysis Methods:
The performance of the PLL is evaluated by comparing the input perturbed signal with the output response of the PLL.
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