Voltage building-up method in guide vane pre-opening mode for water pump working condition

Abstract

The invention relates to a voltage building-up method in a guide vane pre-opening mode under a water pump working condition. When the working condition of a unit is changed into the water pump working condition from a pumped phase modulation working condition, the hydraulic vibration abnormal value of the unit with a small-opening guide vane is avoided in a guide vane pre-opening mode, so that the unit can be operated under the water pump working condition, and the performance requirement of the unit is met. The method has the advantages of convenience of use and high reliability, ensures that other units have sufficient water for debugging, has a positive effect on a pumped storage power station, and improves the project progress, safety stability and economic benefit of the power station.

Description

technical field [0001] The invention is applied to a pumped storage unit, especially a method for avoiding the hydraulic vibration problem of the unit caused by the small opening of the guide vane by pre-opening the guide vane, specifically a method for building pressure by pre-opening the guide vane in the pump working condition. Background technique [0002] The Yixing pumped storage power station is equipped with 4 single-stage vertical shaft mixed-flow reversible pump-turbine units produced by GE Hydropower Company with a stand-alone capacity of 250MW. When the unit is started under the pumping condition, the guide vane opens from zero opening to the optimal opening of the guide vane of the unit, so that the unit reaches a steady pumping state. However, during the commissioning and start-up test of unit 1, when the unit changed from the pumping phasing (SCP) working condition to the pumping (PO) working condition, it was found that the unit vibrated abnormally when the ...

AI Technical Summary

Problems solved by technology

However, during the commissioning and start-up test of unit 1, when the unit changed from the pumping phasing (SCP) working condition to the pumping (PO) working condition, it was found that the unit vibrated abnormally when the guide vanes were at a small opening, and the vibration caused most of the active guide vanes The friction plate between the upper and lower crank arms of the vane slipped, and the connecting pins between the crank arms and connecting rods of some movable guide vanes and between the connecting rod and the control ring fell off or lifted, causing serious damage to the unit and endangering the safe and stable operation of the power station