研究目的
To enhance the fault-ride-through capability of grid-connected photovoltaic systems under asymmetrical faults by proposing a cooperative operation method involving a resistive-type superconducting fault current limiter and an online current limitation strategy.
研究成果
The cooperative operation of R-SFCL and OCLS effectively improves transient and steady-state performance of GCPVS under asymmetrical faults, enhancing FRT capability by restraining currents, stabilizing DC voltage, and improving terminal voltages.
研究不足
The application scenario of OCLS is generally narrow, and GCPVS cannot endure severe voltage sag without hardware enhancements. The study is simulation-based and may not account for all real-world variations.
1：Experimental Design and Method Selection:
The study involves designing a cooperative operation scheme for R-SFCL and OCLS in a GCPVS under asymmetrical faults. Theoretical models include symmetrical component method for sequence separation and E-J power law for SFCL resistance modeling.
2：Sample Selection and Data Sources:
A 4×500kW centralized GCPVS with a 30km transmission line is simulated, using parameters detailed in the appendix.
3：List of Experimental Equipment and Materials:
Includes PV array, boost converter, grid-side converter, R-SFCL, and transmission line components.
4：Experimental Procedures and Operational Workflow:
Simulations are conducted in MATLAB/Simulink to compare schemes with and without SFCL under double-line-to-ground faults. Data on grid-connected currents, DC voltage, PV power, and terminal voltages are collected.
5：Data Analysis Methods:
Performance evaluation based on current limitation, voltage stabilization, and power improvement using derived equations and PI controllers.
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