研究目的
Investigating the application of supercapacitors for smoothing power fluctuations in photovoltaic (PV) systems connected to the grid.
研究成果
The basis for further and more extensive investigation of storage in PV systems installed in homes is presented. The presence of the load is accounted for and the importance of the controlling parameters is highlighted. Future work will be concentrated on efficient bidirectional DC–DC converters to deliver the stored power to the grid during disturbance and storing energy during non-disturbance periods. Methods to identify the disturbance and its level must also be investigated. The quality of the power during the disturbance with compensation is of paramount importance. Furthermore, the appropriate equivalent circuit of the supercapacitor model device will be examined in terms of its electrical and other characteristics.
研究不足
The system is operated in an open-loop mode without the corrective action of the closed-loops of the MPPT and the load angle. The study is a preliminary investigation of supercapacitor application in terms of power flow. Future work is needed on efficient bidirectional DC–DC converters, methods to identify the disturbance and its level, and the appropriate equivalent circuit of the supercapacitor model device.
1：Experimental Design and Method Selection:
The system is analyzed to define the operating point and controlling parameters for correct power sharing between the load and the grid. The operating point is set by the duty cycle (D) of the DC–DC converter, the depth of modulation (Dm) of the inverter, and the phase angle (δ) between the output voltage of the inverter and the grid voltage. The system is simulated in an open-loop mode to investigate the effect of each parameter without the corrective action of the closed-loops of the MPPT and the load angle. A preliminary investigation of a supercapacitor controlled storage application is performed in terms of the power flow.
2：Sample Selection and Data Sources:
The system under investigation is a 3KWp Net metering configuration employing 12 Luxor ECO Line PV modules of 250W.
3：0W. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The system is modelled in PSIM software. A 50F supercapacitor module is used for the compensating circuit.
4：Experimental Procedures and Operational Workflow:
The system is first simulated without the smoothing circuit to confirm the correct operation in terms of power sharing at the calculated parameters. Then, controlled smoothing is applied via a bidirectional dc/dc step up converter connecting a charged supercapacitor module to the input of the inverter.
5：Data Analysis Methods:
The results are derived from the simulation of the PV system in PSIM and compared with theoretical calculations.
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