研究目的
The problem of state and parameter estimation in photovoltaic (PV) systems, focusing on online estimation of PVG current and voltage as well as the unknown resistance parameter of the cable.
研究成果
The designed adaptive high gain observer effectively estimates the PVG output voltage and current as well as the cable resistance parameter, overcoming the challenges of measurement inaccuracies and MPPT control inaccuracies due to long PV cables. The observer's convergence is theoretically proved and its performance is validated through simulation.
研究不足
The study acknowledges the challenge of achieving faster convergence without signal disturbance due to the high gain observer characteristics. The design parameters are chosen as a compromise between satisfactory convergence and less disturbance.
1：Experimental Design and Method Selection:
The study proposes an adaptive high gain observer for state and parameter estimation in PV systems. The observer design is based on Lyapunov stability theory to ensure convergence.
2：Sample Selection and Data Sources:
The system consists of a 2kW PV generator supplying power to a 1.2kW DC centrifugal pump via a 500m PV cable.
3：2kW DC centrifugal pump via a 500m PV cable.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: PV modules, DC-DC boost converter, DC centrifugal pump, and PV cable with specified parameters.
4：Experimental Procedures and Operational Workflow:
The observer's performance is evaluated through simulation under varying solar irradiation steps and constant temperature.
5：Data Analysis Methods:
The convergence of the observer is analyzed using Lyapunov approach, and its performance is evaluated by simulation results.
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