以VFC脉冲序列为变量的继电保护硬件运算新方法  

A New Operation Method of Relay Protection Hardwarewith VFC Pulse Train as Variable

作　　者：葛亦兵 GE Yibing(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,China)

机构地区：[1]中国能源建设集团广东省电力设计研究院有限公司,广州510663

出　　处：《南方能源建设》2020年第3期125-130,共6页Southern Energy Construction

摘　　要：[目的]数字信号处理基础理论中,连续时间变量函数的微积分运算问题的处理,都可转化为其相对应离散信号的差分与累加运算。目前此原理在微机型继电保护方面的应用都是基于定间隔采样值的软件运算。此文提出一种上述理论的新应用类型,将采样及运算过程融入到A/D转换的离散、量化和编码环节,用以简化运算量开销提高保护性能。[方法]以VFC串行脉冲信号的即时序列和延时序列为变量,以计数器为核心运算硬件,配以脉冲延时等器件构建单重和多重“浮动运算窗口”实现微积分和相量加减的硬件同步运算。选择性引用成熟的软件保护算法理论,通过区间变换演算到新方法算式并提出回路构建模式。[结果]经讨论和演算得出下列结果,用新方法可以构成电气量的瞬时积分值、瞬时采样值、定积分有效值,并且用它们还可搭建相量和整套保护。[结论]虽与软件运算基于相同的基础原理,但其运算物理过程十分简洁,可完成高精度同步运算,并形成多种算子,可构建多种原理的保护方案。[Introduction]In the basic theory of digital signal processing,the calculus operation of continuous time variable function can be transformed into the difference and accumulation operation of corresponding discrete signal.At present,the application of this principle in microcomputer type relay protection is based on the software operation of fixed interval sampling value.In this paper,A new application type of the above theory is proposed,which integrates the sampling and operation process into the discrete,quantization and coding links of A/D conversion,so as to simplify the computational overhead and improve the protection performance.[Methods]The real-time sequence and delay sequence of VFC serial pulse signal were taken as variables,the counter was taken as the core computing hardware,and the single and multiple"floating operation Windows"were constructed with pulse delay devices to realize the hardware synchronization of calculus and phasor addition and subtraction.Based on the mature theory of software protection algorithm,the new algorithm formula is obtained by interval transformation and the loop construction mode is proposed.[Result]After discussion and calculation,the following results are obtained.The new method can be used to construct the instantaneous integral value of the electrical quantity,the instantaneous sampling value and the effective value of the definite integral.[Conclusion]Although the operation is based on the same basic principle as software operation,the physical process of operation is very simple,which can complete high-precision synchronous operation,and form a variety of operators,which can construct a protection scheme of multiple principles.

关 键 词：微机保护算法 脉冲序列 浮动窗口 计数器 VFC 

分 类 号：TM7[电气工程—电力系统及自动化] TM63