基于低热阻回填材料的光伏电站动态负荷增容方法研究Research on Dynamic Load Capacity Expansion Method for Photovoltaic Power Plants Based on Low Thermal Resistance Backfill Materials
王峰
摘要(Abstract):
海上光伏电站送出电缆通道往往存在密集敷设现象,导致电缆间互热效应明显进而诱发电缆过热问题。为了对海上光伏电站送出线路进行输送能力精准评估以实现线路的安全稳定运行,通过收集真实海上光伏电站全年负荷出力数据,获取送出电缆的波动负荷特性,搭建送出电缆通道的温度场计算模型,最终实现了充分考虑波动负荷特性下光伏电站送出电缆线路输送能力的精准评估;随后建立排管段三芯电缆热路模型,并基于热解析法计算外部环境热阻,得到了送出电缆通道过热运行的关键影响因素;提出了基于低热阻材料回填的散热强化措施,同时研究了低热阻材料导热系数对敷设断面降温效果的影响,为工程中的材料特性选择提供了指导依据。结果表明:送出电缆通道过热运行的关键影响因素是排管管道内空气段,在填充导热性能为2.5 W/(K·m)的材料后,相比于不填充时电缆最热点温度下降幅度可达30℃,实现了在不增加电缆投资前提下提高了线路输送容量,可为海上光伏发电容量的提升提供技术支撑,同时通过低热阻材料的工程实施案例验证了低热阻材料填充的工程可行性。
关键词(KeyWords): 光伏电站;排管敷设;动态负荷;热路模型;低热阻回填材料
基金项目(Foundation):
作者(Author): 王峰
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