研究目的
To study the effect of distributed generation on fault current level and protection of radial distribution feeder of National University of Science and Technology.
研究成果
The integration of PV distributed generation increases short-circuit current levels and can affect protection system operation, especially when faults occur upstream of PV systems, leading to potential islanding. Existing protection schemes work efficiently for downstream faults but may require advanced methods like ROCOF and SFS for reliable operation with DG integration.
研究不足
The study is specific to the radial distribution network of NUST and may not generalize to other networks. The simulation assumes specific conditions and does not account for all real-world variables. PV inverters have limited fault current contribution due to design constraints.
1：Experimental Design and Method Selection:
The study uses MATLAB Simulink to model and simulate a radial distribution network with and without PV distributed generation. A three-phase fault is simulated to analyze short-circuit current levels and protection system operation.
2：Sample Selection and Data Sources:
The real underground MV network of NUST campus in Islamabad is selected, with load data collected from NUST Project Management Office (PMO).
3：List of Experimental Equipment and Materials:
The network includes a 132kV grid, 4MVA power transformer, 11kV feeder with 16mm2 conductors, 11000/400 volts Delta-Wye transformers, under voltage circuit breakers, fuses, over current relays, and grid-tied solar PV inverters with reactive power control.
4：Experimental Procedures and Operational Workflow:
The network is modeled in MATLAB Simulink. Scenarios without and with PV DG integration are simulated. A three-phase fault is applied at specific points (e.g., downstream of bus 7 or 8), and current profiles and circuit breaker operations are monitored.
5：Data Analysis Methods:
Results are analyzed by comparing short-circuit current levels and protection device operations between scenarios, using MATLAB Simulink for simulation and visualization.
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