潮间带光伏预应力管桩做自然接地体特性研究

Research on Characteristics of Prestressed Pipe Pile Used as Natural Grounding Electrode of Offshore Photovoltaic in Intertidal Zone

摘要:

为研究潮间带海上光伏利用预应力管桩做自然接地体的接地特性，采用CDEGS 仿真软件建立预应力管桩自然接地体的仿真模型，分析了不同海水深度、淤泥层厚度和不同光伏装机规模、桩长对光伏阵列工频接地电阻的影响以及不同桩长、管桩数量和海水深度对冲击接地电阻的影响。经分析，工频接地电阻随海水深度、淤泥层厚度、装机规模的增加而降低且减小幅度逐步变缓并趋于稳定。冲击接地电阻随着支架数量和海水深度的增加而减小，且减小的幅度逐步降低。研究表明潮间带光伏利用预应力管桩做自然接地体具备可行性。

Abstract:

In order to study the grounding characteristics of prestressed pipe pile used as natural grounding electrode of offshore photovoltaic in intertidal zone, a simulation model of prestressed pipe pile used as natural grounding electrode is established by using CDEGS. The impact of different seawater depth and silt layer thickness, different installed capacity and pile length on power frequency earthing resistance of photovoltaic arrays are analyzed as well as the impact of different pile length, number of pipe piles and seawater depth on impulse earthing resistance. According to the analysis, power frequency earthing resistance decreases with the increase of seawater depth，silt layer thickness and installed capacity, and gradually slows down and tends towards stability. While impulse earthing resistance decreases with the increase of the number of supports and seawater depth, and the magnitude of the decrease gradually slows down. The results show that using prestressed pipe pile as natural grounding electrode has the feasibility for offshore photovoltaic in intertidal zone.