基于DSP实现多边形阻抗特性最佳判据的选择

OPTIMAL IMPLEMENTATION OF POLYGON IMPEDANCE CHARACTERISTICS USING DSP TECHNIQUE

探讨了用数字信号处理器 (DSP)芯片独立实现保护功能时如何选择判据实现形式。以距离保护中的多边形阻抗动作特性为例 ,分析了该特性用比相式、比幅式以及直接比较式 3种判据分别实现时DSP的运算复杂度。指出 :虽然硬件的发展为保护算法实现和选择提供了更高的冗余度 ,但仍然应当通过对算法实现形式的良好设计来减少对资源的不必要占用 ,最大限度地发挥硬件的效能 ,提高装置的总体可靠性水平。

How to choose the expression of the criterion when the protection function is implemented with the DSP chip is discussed. The computing complexities of DSP are analyzed when the polygon impedance characteristics of distance protection are realized with three types of criteria, i.e., the phase angle comparative criterion, magnitude comparative criterion, and direct comparative one. It has been proved that the protection algorithm should be optimized to reduce the unnecessary occupation of the hardware resource although the development of hardware provides higher redundancy for the implementation and choice of the protection algorithm. Thus, the aggregate reliability level of the protection device can be improved.