研究目的
To propose a new fast technique for detecting short circuit current in PV distributed generators, enabling rapid disconnection or transformation into a STATCOM for grid support.
研究成果
The proposed fast short circuit current detection technique effectively prevents adverse short circuit current contributions from PV inverters by enabling rapid disconnection or transformation into a STATCOM for grid support. It responds successfully to various fault types and locations, discriminating between faults and other transient events. This technique facilitates the integration of more PV solar systems in grids with strict short circuit current limits.
研究不足
The technique assumes the PV solar farm has only one inverter and is connected directly to the PCC without any intervening cables or lines. For large solar farms with multiple inverters, coordination and communication delays need consideration.
1：Experimental Design and Method Selection:
The study involves the development of a fast short circuit current detection technique based on the slope and magnitude of PV inverter current. PSCAD/EMTDC software is used for simulation studies on a realistic distribution network.
2：Sample Selection and Data Sources:
The study system includes a 25 km long 27.6 kV feeder connecting a transmission network through a substation, with a 7.5MW PV solar farm connected near the end of the feeder.
3：6 kV feeder connecting a transmission network through a substation, with a 5MW PV solar farm connected near the end of the feeder.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: PV modules, boost converter, inverter, AC filter, Maximum Power Point Tracking (MPPT) module, and the inverter controller.
4：Experimental Procedures and Operational Workflow:
The proposed fault detection module measures instantaneous inverter output current and terminal voltage, processes these signals through slope and magnitude detectors, and generates a trigger signal for rapid disconnection or transformation into STATCOM.
5：Data Analysis Methods:
The effectiveness of the technique is demonstrated through PSCAD-based simulation studies, analyzing the response to symmetrical and asymmetrical faults, and its application in stabilizing a critical induction motor load.
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