计及轴向传热的中低压单芯电缆导体温升状态空间模型
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国家自然科学青年基金资助项目(51607091)


The state space model of conductor temperature estimation considering axial heat conduction for middle and low voltage single core power cable
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    摘要:

    电力电缆导体温度可为线路载流量及运行状态的评估提供依据。然而,在当前电缆温度计算中,导体的轴向温度分布通常被忽略,无法准确描述电缆运行的热动态过程。为此,基于热平衡原理,在状态空间内提出了计及轴向传热的中低压单芯电缆导体的温升模型。为克服模型参数难以确定的问题,提出了基于粒子群优化算法的电缆热路参数辨识方法。为验证模型精度,建立了电缆温升实验平台,在不同电流下对空气中敷设电缆进行了轴向温升实验。计算结果与实验结果的对比表明,当电缆存在轴向温度梯度时,所提状态空间模型结果精度高于IEC 60287标准模型,能够满足中低压单芯电缆导体在不同电流条件下的轴向温升计算要求。

    Abstract:

    Power cable conductor temperature is an important parameter to evaluate the ampacity and operation status of transmission line. However, the current cable temperature calculation model can not accurately describe thermal dynamic process of cable operation for ignoring the axial conductor temperature distribution. To solve this problem, a state space model of conductor temperature estimation considering axial heat conduction for middle and low voltage single core power cable was proposed in this paper which based on thermal equilibrium principle. To overcome the shortcoming that the thermal parameters are difficult to accurately calculate, a power cable conductor thermal parameter identification algorithm based on particle swarm optimization (PSO) was proposed. To verify model accuracy, a cable temperature experiment platform was established and the axial temperature of air laying power cable under various current was measured. Comparison of calculation results and experimental results shows that the precision of proposed model is higher than that of IEC 60287 model, the proposed model can meet the precision requirement of middle and low voltage power cable conductor temperature calculation under various current which can be applied to describe the single core power cable thermal dynamic process more accurately.

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朱立位,潘宏承,应展烽,何玲.计及轴向传热的中低压单芯电缆导体温升状态空间模型[J].电力工程技术,2019,38(1):24-30

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历史
  • 收稿日期:2018-08-28
  • 最后修改日期:2018-10-08
  • 录用日期:2017-12-25
  • 在线发布日期: 2019-01-28
  • 出版日期: 2019-01-28