基于厂站方式灵敏系数的运行方式组合方法

A Method for Combining the Operation Modes Based on the Operation Mode Switching Sensitivity Factor of Power Substations or Plants

结合高压电网整定计算中所关心的厂站结构特点,将其内部元件方式的变化看做一个整体单元的参数切换。根据整定计算所需要的故障计算量,引入了2类厂站方式灵敏系数。通过预先确定对故障电流和配合系数影响较大的厂站及其方式,能够有选择性地考虑厂站方式变化对保护定值的影响并进行相应的故障和整定计算,从而有效减少不必要的组合方式及故障计算量。实际工程算例表明该方法能有效提高保护定值的准确性和整定计算软件的效率,具有较好的实用性。

By taking into account the topology characteristics of power substations or plants in the relay coordination of the high- voltage transmission system, the operation mode variation in the power substations or plants can be thought of as an integral unit with different impedance parameters. Two types of sensitivity factors are derived that demonstrate the relationship between the fault current or coordination coefficients and different operation modes of different substations or plants. The operation mode of substations or plants with great impact on the setting of relays will be considered in the relay coordination. Numerous ineffective operation modes are excluded based on the sensitivity factor identification in advance. The results of engineering examples show the effectiveness and practicability of the proposed method in improving the accuracy of setting and efficiency of the relay coordination software.