Control/maintenance strategy fault tolerant mode and reliability analysis for hydro power stations

Reliability analysis for hydro power stations for (N + M) and 2N fault tole rant modes (FTM) and their comparison from the standpoint of control and ma intenance have been carried out in this paper, it shows that the (N + M) FT M is superior to 2N FTM in reliability and economics in most cases. So, (N + IM) FTM is recommended for large power stations, especially for multi-uni t plants, A simple method to choose the number of standby controllers is de veloped by optimizing the (N + M) FTM. The ideas and results proposed in th is paper can be used not only for governing systems in hydro power stations but also for other industrial systems.