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The article discusses the main criteria for optimizing the operational modes of a hydropower power plant in terms of active power. Relative growth characteristics are used to calculate the distribution of active power between stations for more rational use of water resources. Also, this method allows to optimally distributing the load between the units of one station. Basically, the characteristic of the relative increase in the load of the units depends on the operational characteristics of the hydraulic turbines. The article provides calculations of the relative increase in load at the Nurek hydropower power plant.

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This paper proposes hydro generator vibration observations under various conditions and solution of a problem of high vibration in upper guide bearing of 110MW hydro generator. Among the test, which were carried out to identify vibration origin of hydro generating unit were: voltage drop tests, magnetic flux measurements, interferric gap measurements, turbine pressure pulsation measurements, etc. It was shown, that among other possible reasons, correct balancing, including pivot bearing adjustment was the most efficient measure to eliminate vibration in start-up modes of hydro power unit. According to the results of conducted step-by-step defect analysis, the corresponding recommendations were provided for service and maintenance regarding the generation unit No2 of Sangtuda-2 Hydro Power Plant, Tajikistan.