两种故障电流相控开断电流零点预测算法对比  

Comparison between Two Methods of Zero-cross Point Prediction for Controlled Fault Current Interruption

作　　者：段雄英[1] 黄智慧[1] 李蕊[1] 邹积岩[1] 

机构地区：[1]大连理工大学电气工程学院,大连116024

出　　处：《高压电器》2011年第1期5-9,共5页High Voltage Apparatus

基　　金：国家自然科学基金资助项目(50877006);"十一五"国家科技支撑计划资助项目(2009BAA19B03);国家电网公司科技攻关项目(SG0846)~~

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。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.

关 键 词：故障电流 相控开断 零点预测 安全点算法 自适应算法 

分 类 号：TM561[电气工程—电器]