微机反时限过流保护算法  

Microprocessor-based inverse time over-current protection algorithm

作　　者：徐厚东[1] 黄益庄[1] 付铭[1] 

机构地区：[1]清华大学电机工程与应用电子技术系电力系统及大型发电设备安全控制和仿真国家重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2006年第1期1-4,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：为了解决反时限特性曲线中的指数运算转换为微处理器能够处理的运算的问题,分析了微机反时限过流保护特性曲线的数学模型和目前常用的微机反时限过流保护算法的优点和不足,提出了一种拟合算法。该算法利用T a ilor展开和数据存储相结合的方法拟合反时限特性曲线。仿真结果表明,该算法精度可以达到0.5%。利用该算法可以拟合任意的反时限特性曲线,能够方便地实现多条反时限特性曲线的设计,有利于将反时限过流保护应用于电力系统微机保护中。Exponential calculation of the inverse time over-current curves is inherently difficult to analyze mathematically in a microprocessor for real time analyses for power system relay protection systems. Therefore, an analytical model using a Taylor series approxmation to the inverse time over-current curve was developed to improve the processing time. The algorithm uses a Tailor series approach with stored data to quickly approximate the inverse time over-current curve and can easily reach a precision of 0.5%. The approach can match any inverse time over current curves among them for multl-curve approximations of the inverse time over-current. Therefore, it is suitable for microcomputer-based inverse time over-current protection.

关 键 词：电力系统继电保护 反时限过流 微机保护 

分 类 号：TM77[电气工程—电力系统及自动化]