Improved dual host fault-tolerance scheme of distributed master station

The characteristics of backup configuration of present power automation master stations are introduced. An improved dual-machines fault-tolerance scheme is presented. The synchronization of service group configuration status of network is simplified by only saving service group configuration status in shared disk array. Internal mutual judgment is only carried out in database service group and other service groups is only needed to judge self status and reply the safety query from database service group. So the algorithm complexity is reduced. Finally the data communication by unit of service group is introduced. Analysis and application show that this scheme is practical, reliable. (4 pages)