基于阻抗优化的电缆环流抑制装置参数设计

Parameter Design of Cable Circulation Suppression Device Based on Impedance Optimization

针对现有高压电缆金属护套环流抑制装置投入和退出缺乏灵活性,确定抑制阻抗数值时未考虑护套感应电压超标、功率损耗过大等问题,设计了一种能根据现场情况对护套环流抑制阻抗进行动态投入或退出的环流抑制装置。首先,阐述了该抑制装置的结构和动作流程;接着分析了抑制阻抗分别为纯电阻、纯电感和电阻电感组合三种类型时护套环流、感应电压和护套损耗的变化特性;在此基础上,建立优化模型求解满足护套环流和感应电压要求时使功率损耗最小的最佳阻抗值,基于最佳阻抗值对晶闸管等元件的参数进行配置。结果表明,所提方法可以得到满足工程要求的电缆抑制阻抗最优值,实现良好的环流抑制效果。

In view of the lack of flexibility in the input and exit of the current metal sheath loop suppression device for high voltage cables,the problems such as excessive induced voltage of the sheath and excessive power loss were not considered when determining the suppression impedance value,a loop suppression device was designed which could dynamically input or exit the loop suppression impedance of the sheath according to the field conditions.Firstly,the structure and operation flow of the suppression device was described.Then,the variation characteristics of sheath circulation,induced voltage and sheath loss when the suppression impedance was pure resistance,pure inductance and combined resistance inductance were analysed.On this basis,an optimization model was established to solve the optimal impedance value which can minimize the power loss when meeting the requirements of sheath circulation and induced voltage.Based on the optimal impedance value,the parameters of thyristors and other components were configured.The results show that the proposed method can obtain the optimal value of cable suppression impedance that meets the engineering requirements,and achieve a good circulation suppression effect.