研究目的
To propose a method in which the grid phase angle information is not necessary for the correct performance of the GCPPP, achieving the same results when using a phase-angle extraction method for the current controllers.
研究成果
The proposed PLL-less control method for GCPPPs achieves the same results when using a phase-angle extraction method for the current controllers, without requiring a PLL technique and tuning of its parameters. A new current limiter to protect the inverter from grid disconnection has also been proposed, based on changing the operating point of the PV array by increasing the dc-link voltage reference towards the open circuit value.
研究不足
The proposed controller can still operate well if the estimated and actual frequencies do not differ much, but accurate measurement of the grid frequency would be the best for optimal performance.
1：Experimental Design and Method Selection:
The proposed control technique uses an arbitrary angle instead of grid voltage synchronization, avoiding the need for a PLL technique.
2：Sample Selection and Data Sources:
Simulation and experimental tests were conducted on a GCPPP setup.
3：List of Experimental Equipment and Materials:
A
4：3-kW GCPPP setup was used, including a regenerative programmable ac power supply, dc power supply, computer, oscilloscope, 5-kVA step-down transformer, power meter, 5-kVA two-level three-phase dc-ac inverter, DSpace 1103 real-time interface, and voltages and currents sensors. Experimental Procedures and Operational Workflow:
The performance of the proposed PLL-less method and current limiter was tested under unbalanced grid voltage sags.
5：Data Analysis Methods:
The results were analyzed to verify the performance of the proposed GCPPP.
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