Pumped storage unit water pump working condition hump area stability evaluation method considering dynamic characteristics

Abstract

The invention relates to a pumped storage unit water pump working condition hump area stability evaluation method considering dynamic characteristics. The invention aims to provide a pumped storage unit water pump working condition hump area stability evaluation method considering dynamic characteristics. According to the technical scheme, the evaluation method comprises the steps that several corresponding working conditions of the high-lift operation transition process of a water pump are selected according to the principle of generating the maximum dynamic lift of a unit and the arrangementtype of a water delivery power generation system; according to the selected working condition, the transition process of the water delivery power generation system of the pumped storage power stationis calculated, and the maximum dynamic lift Hdmax of the pumped storage unit in the transition process is obtained; and the maximum dynamic lift point Hdmax is marked on the working condition H-Q curve of the water pump of the pumped storage unit, the bottom lift Humin of the hump area is marked according to the form of the curve, and the allowance between the maximum dynamic lift Hdmax and the bottom lift Humin of the hump area is calculated so as to evaluate the stability of the working condition hump area of the water pump of the pumped storage unit. The invention is applicable to the technical field of hydropower and hydraulic engineering.

Description

Technical field[0001]The invention relates to a method for evaluating the stability of a pumped storage unit pump working condition hump zone considering dynamic characteristics. It is suitable for the technical field of hydropower and water conservancy engineering.Background technique[0002]Pumped-storage power station is an economical and efficient way of large-scale energy storage, and it is recognized as a flexible, reliable and environmentally-friendly regulated power supply worldwide. The power station is generally composed of upper reservoir, lower reservoir, water diversion system, tail water system, underground powerhouse, pumped storage unit, etc. Among them, the water diversion system, tail water system and unit constitute the power plant water transmission and power generation system. The pumped storage unit is the core of the water delivery power generation system. Because the pumped storage unit needs to meet the two-way operation of pumping conditions (pump conditions)...

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Problems solved by technology

[0003] At present, in the engineering design of pumped storage power plants and unit model acceptance tests at home and abroad, the margin of the hump area only considers the static margin, that is, only considers the margin of the hump area when the unit is running at the highest lift statically, and does not consider the output power. Influence of Dynamic Characteristics of Hydropower System on Maximum Lift

Under dynamic working conditions such as large pressure fluctuations in the water transmission and power generation system, there is a risk of the unit running into the hump area, resulting in instability and hidden dangers to the safety of the power station

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