研究目的
To build a model that can simulate DC arc in a PV system, so that the long-time interactions between the arc and PV system can be studied more conveniently and deeply.
研究成果
The paper introduces a method to simulate the long-time-series DC arc in a PV system using MATLAB/Simulink software. The Habedank model was selected to simulate the U–I characteristics of the long-time DC arc. The simulation results show good correlation with the measured data. The interactions between the arc and MPPT were investigated, showing that the arc can cause the P&O MPPT algorithm to reduce the output power of PV array through negative perturbation of MPPT, while the MPPT can influence the change of arc current.
研究不足
The study is conducted under uniform irradiance, which is the simplest situation. There are many complicated situations in reality that are not covered, such as varying irradiance, the impact of DC arc on advanced MPPT algorithms, methods to enhance the robustness of MPPT algorithms under arc-fault conditions, and the impact of arcs of different types and locations on PV systems.
1：Experimental Design and Method Selection:
The study involves building a simulation system with an arc model and PV system model to understand the mechanism of interactions between the PV system and DC arc. The characteristics of the series DC arc in a small grid-connected PV system are investigated under uniform irradiance. The Habedank model is selected to simulate the fault arc.
2：Sample Selection and Data Sources:
The experiment was conducted at a small grid-connected PV station with a single string of 10 solar panels connected to the grid with the help of a two-stage inverter.
3：List of Experimental Equipment and Materials:
The type of solar panel, inverter, and measuring equipment used in the experiment are specified, including JT240PLe solar panel, Zeverlution3000S inverter, Tektronix MSO2024 oscillator, Tektronix TCP0030 current probe, and Sapphire SI-9110 voltage probe.
4：Experimental Procedures and Operational Workflow:
The fault arcs were generated by separating the electrodes of the arc-generating device. The arc behavior is influenced by the properties of discharge gas and electrodes. The experiments were conducted under uniform irradiance of around 900 W/m
5：Data Analysis Methods:
The trends of simulated arc waveforms are compared with the measured data, and the fitting degree in adjusted R-squared is analyzed.
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