继电保护整定计算电源运行方式优化选择方法

Optimized power source operation mode selection method for relay setting calculation

为提高继电保护整定计算中电源运行方式选择的合理性与计算效率,提出一种基于电源贡献系数法的优化选择方法.提出电源贡献系数的概念和基于节点阻抗矩阵的计算方法;根据保护支路和助增支路电源贡献系数的计算结果,构建电源运行方式的优化选择方法.在新英格兰10机39节点系统中进行算例验证,结果表明:上述方法能够准确地给出各电源在最小或最大配合系数的计算中所对应的大小方式,可以避免排列组合的枚举,提高了自动整定计算的效率.

A power source contribution coefficient-based optimized method was proposed to increase the reasonability and efficiency of the power source operation mode selection in relay setting calculation.The concept of power source contribution coefficient and corresponding calculation method based on the node impedance matrix were presented.A system operation mode selection method based on the power source contribution coefficients of the protected line and infeed branches was developed.The effectiveness of the proposed method was verified through the case study of New England 39-Bus test system.Results show that by utilizing the proposed infeed coefficient calculation method,the specific operation modes of different power sources corresponding to the maximal and minimal infeed coefficient values can be determined precisely.This process does not need permutation or combination,which improves the efficiency and accuracy of the automatic relay setting calculations.