中文摘要：

目标电流零点的快速预测是实现故障电流相控分断技术的一个关键难题。针对目前最主要的两种电流零点快速预测算法——安全点法和自适应算法，展开了理论与仿真研究，通过建立单相系统短路故障电流的数学模型，分析对比两种算法的适应性。分析表明，对于不含谐波的故障电流模型，自适应算法的误差相对较小，精度较高；对于含有谐波的故障电流模型，安全点算法简单、可靠、容易实现，能够较好地预测波形。两种算法目前都只适用于单相故障系统。

英文摘要：

For controlled fault current interruption, rapid prediction of zero-cross point of objective current is a key factor, however a difficult problem. Two major rapid algorithms for predicting the zero-cross point, i.e. the safe-point algorithm and the adaptive self-checking algorithm, were hence proposed. This paper discussed the two algorithms via theoretical analysis and simulation. A single-phase short circuit fault current model was established to analyze and compare the suitability of two algorithms. The results show that for the short circuit fault current model without harmonics, the adaptive self-checking algorithm can predict the zero-cross point of objective current with higher precision, and for the short circuit fault current model with harmonics, the safe-point algorithm works easier and can achieve better waveform. However, both algorithms can only be applied to the system with single-phase fault.