三微机混合冗余容错模式及其在水轮机调速器中的应用

A Hybrid Triplex Redundant Fault-tolerant System Configuration AndIts Application in Hydroturbine Governor

容错是数字系统的存在属性。为了进一步提高工业过程微机控制系统的可靠性，在综合动态冗余容错技术和静态冗余容错技术的基础上，提出了一种三微机混合冗余容错模式：在统级硬件冗余的条件下，通过机内信息流划分和机间信息交流，部分实现功能单元级冗余容错，而且应用智能技术将三模表决机制发展为检测、表决和切换相综合的策略，使系统既可三模运行，亦可双模或单模运行。该系统模式已被成功地应用于水轮机调速器。

Fault-tolerance is the survival attribute of digital systems.A hybrid triplex redundant fault-tolerant system configuration i s developed to further enhance the reliability of microcomputer-based industrial process controllers, on base of the synthesis of the advantages of the dynamic redundant technique and the masking redundant technique. Although that the hardware redundancy is at system level, the system with this configuration partly has redundant structure at function unit level by means of the division of information flow in subsystem and the exchange of information among subsystems. And moreover the voting mechanism of usual triplex redundant systems is replaced by an intelligent fault detection, voting and switching strategy. So the system can run in either triplex or duplex or single modular mode. The redundant resources can be exhaustively used. This system configuration was successfully applied to a microcomputer-based hydroturbine governor.