突发冻结环境下OPGW超临界直流动态除冰效果研究

Study on Dynamic Deicing Effect of OPGW Supercritical DC under Sudden Freezing Environment

光纤复合架空地线(OPGW)作为智能输电技术研究热点,其冰冻条件与电网稳定运行效果息息相关,直流除冰技术为重要突破口。针对突发冻结环境,设计了一种超临界直流动态除冰模型,获取OPGW超临界直流融冰影响因素,建立动态温度评估体系,并通过仿真实验对热交换效果予以评估。结果表明:突发冻结环境下冰层中段热交换系数对破冻效果影响巨大,除冰效果与温度、空气流速、冰层温差等因素相关,另外,影响OPGW融冰电流因素同上述因素,电流大小会随着温差扩大、空气流速呈现增加态势,但冰层厚度对融冰电流影响因素较低。因此,实践中应根据上述因素动态调整融冰电流。

The optical fiber composite overhead ground wire(OPGW)is a research hotspot of intelligent transmission technology.Its freezing conditions are closely related to the stable operation effect of power grid,and DC deicing technology is an important breakthrough.In this paper,a supercritical DC dynamic deicing model is designed for the sudden freezing environment.The influencing factors of OPGW supercritical DC deicing are obtained,the dynamic temperature evaluation system is established,and the heat exchange effect is evaluated through simulation experiments.The results show that under the sudden freezing environment,the heat exchange coefficient in the middle of the ice layer has a great influence on the freezing breaking effect,and the deicing effect is related to factors such as temperature,air velocity and ice temperature difference.The factors affecting OPGW ice melting current are the same as the above factors.The current can increase with the expansion of temperature difference and air velocity,but the influence factor of ice thickness on ice melting current is low.Therefore,in practice,the ice melting current should be dynamically adjusted according to the above factors.