节点文献
变电站瞬态电磁环境数值预测方法的研究
Research on Numerical Prediction Methods for Transient Electromagnetic Environments in Substations
【作者】 卢铁兵；
【导师】 崔翔；
【作者基本信息】 华北电力大学 ， 电工理论与新技术， 2002， 博士
【摘要】 本文结合国家自然科学基金资助项目“变电站瞬态电磁环境的预测计算方法研究”(项目编号：50077006)，重点研究了空气绝缘变电站和气体绝缘变电站由于开关操作产生的瞬态电磁过程及其瞬态电磁环境的数值预测方法，主要研究成果如下： (1)提出了级联和分支多导体传输线的时域有限差分法，推导出连接点的时域有限差分法迭代公式。 (2)提出了一种获取土壤阻抗时域形式的方法，该方法将Pade逼近和拉普拉斯反变换相结合，获得了复阻抗的时域形式。还提出了含频变参数的架空多导体传输线的时域有限差分法迭代公式。 (3)采用广义索莫菲恒等式以及广义函数束法，提高了计算电偶极子产生的瞬态电磁场的计算速度。 (4)提出了将多导体传输线时域有限差分法和电偶极子法相结合的空气绝缘变电站瞬态电磁环境数值预测方法，并对一座500kV变电站开关操作产生的瞬态电磁环境进行了预测计算，获得了可用于指导二次设备下放后其电磁屏蔽设计的关键数据。 (5)开发了一套基于传输线法和矩量法的气体绝缘变电站瞬态电磁环境数值预测软件包，并对一座125kV的气体绝缘变电站的瞬态电磁环境进行了数值预测，其数值预测结果与测量结果吻合。 本文研究成果可用于超高压变电站二次设备下放后遇到的瞬态电磁环境的预测计算，并为二次设备的电磁兼容性设计提供理论依据。
【Abstract】 Supported by National Natural Science Foundation of China under grant No. 50077006, the numerical methods to predict the transient electromagnetic environments when the circuit breakers and disconnect switches are operated in air-insulated substations and gas insulated substations are researched in this paper. The main contributions are as follows: 1. The finite difference-time domain method for the multi-conductor transmission lines connected by arbitrary load network or with many branches is proposed, and the iterative equations of the connection points are derived. 2. The method to treat the frequency-dependent parameters of MTLs over lossy soil in time domain is proposed, and then the finite difference-time domain iterative equations for overhead transmission lines are obtained. 3. Based on a generalized Sommerfeld identity and the generalized pencil-of-function method, the electromagnetic field generated by a dipole can be easily calculated, which is quite robust and less noise sensitive 4. Based on multi-conductor transmission lines and dipole method, a numerical method to predict the transient electromagnetic environments due to the operation of switches in air-insulated substation is proposed. After a model of busbars in a 500kV substation is set up, the transient electromag~etic field is predicted. 5. Based on transmission line model and the method of moment, a suit of software to predict the transient electromagnetic environments in gas-insulated substations is developed. A 125kV substation is analyzed, and the validity of the software is testified by contrasting the results of calculation with the results of measurement. The analysis results are useful when the control and protection devices are placed in the high-voltage yard.