研究目的
Investigating the effects of reverse current from large-power photovoltaic generation systems on voltage rise and fall characteristics at the interconnection node and voltage profiles along the power distribution line.
研究成果
The study concludes that the voltage on the distribution line increases from the sending end to the receiving end when the line current is small. However, a relatively large current causes a voltage reduction near the distribution substation. The allowable limits of the line current and output power from the PV system are determined based on the voltage behavior. The study highlights the importance of considering the line impedance and length in the design and operation of power distribution systems with large PV systems.
研究不足
The study is theoretical and does not account for practical variations in load conditions or the dynamic behavior of PV systems. The analysis is limited to a single-phase equivalent circuit, which may not fully represent three-phase distribution systems.
1：Experimental Design and Method Selection:
The study uses a single-phase equivalent circuit of a power distribution system with a large PV system at the receiving end to analyze voltage characteristics. Theoretical models and vector diagrams are employed to understand the voltage behavior.
2：Sample Selection and Data Sources:
The study assumes no load in the distribution system to focus on the influence of the PV system. The line impedance per unit length is specified, and the reverse line current is varied to observe its effects.
3：List of Experimental Equipment and Materials:
The study is theoretical and does not specify physical equipment or materials.
4：Experimental Procedures and Operational Workflow:
The study involves calculating the receiving-end voltage and voltage profiles along the line for different line currents and line lengths. Vector diagrams are used to illustrate the voltage behavior.
5：Data Analysis Methods:
The study uses mathematical expressions derived from the vector diagrams to analyze the voltage characteristics and determine the allowable limits of line current and output power.
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