输电线路故障测距实用算法研究

Study of faults location utilizing algorithm on power transmission lines

针对输电线路双端故障测距算法需要进行双曲函数复杂的计算、牛顿-拉夫逊迭代和二分搜索计算量大、需要精确线路参数等问题,提出了一种新的适合于输电线路差动保护装置的精确故障测距算法。算法原理简单,经过简单的复数运算就可以计算出输电线路的精确参数、两侧非同步采样系数和故障距离。采用正序故障分量来计算故障距离,能适应各种故障类型,计算结果收敛快,不受过渡电阻影响。

A novel accurate location of faults on power transmission line with two-end phasor measurement used in differential protection device is proposed. The new algorithm may solve the shortages such as complex calculations of calculating the hyperbolic functions, large amount of calculation with the Newton-Raphson iteration and binary search and needing accurate line parameters. The algorithm is simple in principle, it can calculate the accurate parameters of the transmission line, coefficient of asynchronous sampling and fault distance through simple complex operation. The algorithm uses the positive sequence fault component to calculate the fault distance, is able to adapt to all type of fault, and the calculation results have fast convergence and do not influenced by the transition resistance.