Hydroelectric generating set guide vane dynamic segmented closing method

Abstract

The invention discloses a hydroelectric generating set guide vane dynamic segmented closing method which comprises the steps that in the set grid-connected normal operation process, servomotor adjustment under the set rated working condition guarantees calculation to obtain an inflection point, during set grid-connected operation, current set parameter values are collected in real time through a collection system, and when the set operates under certain load working conditions, a dynamic change value of an inflection point is calculated through a current unit parameter value, and the obtained dynamic inflection point is used as an optimal closing inflection point under different loads and different water heads and pressures; and the calculated dynamic inflection points comprise a power load inflection point, a water head influence inflection point, a pressure influence inflection point and a comprehensive inflection point calculated according to the power load inflection point, the water head influence inflection point and the pressure influence inflection point. According to the method, the optimal closing inflection points under different loads, different water heads and different pressures are obtained, and the optimal closing of the unit when faults such as load shedding occur is realized, so that the frequency stability of a power system is ensured by the hydroelectric generating set.

Description

technical field [0001] The invention belongs to the technical field of closing guide vanes of hydroelectric units, and in particular relates to a method for dynamically segmented closing of guide vanes of hydroelectric units. Background technique [0002] With the construction of large hydropower units, the proportion of hydropower units in the power grid is also increasing, and the problem that hydropower units affect the frequency stability of the power system is gradually reflected. When the unit itself or the system line fails, the hydroelectric unit should take corresponding operations according to the needs of the situation, and the load shedding of the unit is one of the corresponding countermeasures. During the load shedding process of the hydropower unit, due to the influence of the hydraulic structure, water diversion pipeline, unit rotational inertia, water flow inertia and other aspects, when the guide vane is closed quickly, the water pressure of the pressure st...

AI Technical Summary

Problems solved by technology

Although this can meet the calculation requirements of unit regulation guarantee at rated load, when the unit is partially loaded, when the water level of the upstream reservoir of the unit changes, and when the water level of the unit changes greatly in different periods, it is difficult to reach a working condition of unit load shedding. Optimum shutdown transition conditions, so it is very necessary for the present invention to propose a dynamic segmental shutdown method for guide vanes of hydroelectric units with dynamic adjustment

Images