CN-122022164-A - Calculation method for emergency emptying capacity of full-protection basin of pumped storage power station

CN122022164ACN 122022164 ACN122022164 ACN 122022164ACN-122022164-A

Abstract

The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a calculation method of the full-protection basin emergency emptying capacity of a pumped storage power station, which comprises the steps of determining basic data such as basin water level, reservoir capacity, unit parameters and the like; the method comprises the steps of dividing working conditions according to normal/abnormal running states of a unit in a flood period/a non-flood period, calculating core indexes such as emptying time, water head reduction value, water head reduction rate, reservoir capacity emptying rate and the like under each working condition, verifying capability according to four compliance indexes and outputting a result table, adapting the structural characteristics of the full-protection reservoir basin, and comprehensively covering the working conditions to form a standardized calculation and compliance verification closed loop.

Inventors

WU HENGHENG
XIANG KEMING
CUI XIAO
ZHAO KUN
QIAO HAO
WANG YANCHENG
WANG BING
Zhai Bingrong
LIU SHIJIA
ZHANG YONGHONG
CHEN JIANHUA
TAN HONGBO
LIU XIAONAN
ZHOU CHANGXING
XIE GANG

Assignees

中国电建集团北京勘测设计研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20260130

Claims (12)

1. The calculation method of the emergency emptying capacity of the full-protection basin of the pumped storage power station is characterized by comprising the following steps of: s1, determining basic parameters of a full-protection reservoir basin; S2, dividing emergency emptying working conditions of the unit; S3, calculating emergency emptying time, a water head reduction value, a water head reduction rate and a reservoir capacity emptying rate under each working condition; and S4, verifying whether the emptying capacity meets the requirement, and outputting emergency emptying capacity result calculation tables under different working conditions.
2. The method for calculating the emergency emptying capacity of the full-protection basin of the pumped storage power station according to claim 1, wherein the basic parameters of the full-protection basin comprise: Checking water level, normal water storage level, dead water level, emergency emptying water level, checking reservoir capacity below the water storage level, dead reservoir capacity below the normal water storage level, adjusting reservoir capacity, reservoir capacity below the emergency emptying water level, full-protection reservoir basin reservoir bottom elevation, full-protection reservoir basin water-choking head, number of normally operated units, rated flow of a single unit of a water turbine and load rate of the single unit of the water turbine.
3. The method for calculating the emergency emptying capacity of the full-protection basin of the pumped-storage power station according to claim 2, wherein the emergency emptying water level The following constraints are satisfied: Non-flood period: and (3) in the flood season: ; Wherein, the For the dead water level, For a normal water storage level, To check the water level.
4. The method for calculating the emergency emptying capacity of the full-protection basin of the pumped storage power station according to claim 2, wherein the reservoir capacity is adjusted And full-protection basin water-choking water head Is calculated to satisfy the following constraint: Non-flood period: , and (3) in the flood season: , ; Wherein, the Is the storage capacity below the normal water storage level, For the dead volume of the container, In order to check the storage capacity below the water level, For a normal water storage level, In order to check the water level, Is the height of the bottom of the full-protection basin.
5. The method for calculating the emergency emptying capacity of the full-protection basin of the pumped-storage power station according to claim 2, wherein the reservoir capacity below the emergency emptying water level The calculation formula of (2) is as follows: Wherein, the For the area of the reservoir basin corresponding to the emergency emptying water level, Is the area of the warehouse basin corresponding to the height of the warehouse bottom of the full-protection warehouse basin, For an emergency emptying of the water level, Is the height of the bottom of the full-protection basin.
6. The method for calculating the emergency emptying capacity of the full-protection basin of the pumped storage power station according to claim 1, wherein the emergency emptying working condition of the unit comprises the following steps: The flood season is normal operation conditions and abnormal operation conditions; The normal operation working condition is normal operation of all units of the power station, and the abnormal operation working condition comprises no-load operation and load operation of the units.
7. The method for calculating the emergency emptying capacity of a full-protection basin of a pumped-storage power station according to claim 1, wherein the water head reduction value is The calculation of (2) satisfies the following condition: Non-flood period: and (3) in the flood season: ; Wherein, the For a normal water storage level, For an emergency emptying of the water level, To check the water level.
8. The method for calculating the emergency emptying capacity of the full-protection basin of the pumped-storage power station according to claim 1, wherein the water head reduction rate is The calculation of (2) satisfies the following condition: Non-flood period: , ; And (3) flood season: , ; Wherein, the For a normal water storage level, For an emergency emptying of the water level, Is a full-protection basin water-blocking head, Is the height of the bottom of the full-protection basin, To check the water level.
9. The method for calculating the emergency emptying capacity of a full-protection basin of a pumped-storage power station according to claim 1, wherein the reservoir capacity emptying rate is as follows The calculation of (2) satisfies the following condition: Non-flood period: and (3) in the flood season: ; Wherein, the For the storage capacity below the emergency emptying water level, Is the storage capacity below the normal water storage level, To check the storage capacity below the water level.
10. The method for calculating the emergency emptying capacity of the full-protection basin of the pumped-storage power station according to claim 1, wherein the emergency emptying time The calculation of (2) satisfies the following condition: Non-flood period: ; And (3) flood season: ; Wherein, the Is the storage capacity below the normal water storage level, For the storage capacity below the emergency emptying water level, In order to check the storage capacity below the water level, For the number of units in normal operation, The full flow rate of the single unit of the water turbine is achieved, The load factor of a single unit of the water turbine is obtained.
11. The calculation method of the emergency emptying capacity of the full-protection basin of the pumped-storage power station according to claim 1, wherein the determination condition for verifying whether the emptying capacity meets the requirement in the step S4 is as follows: Non-flood period: ; ; ≥20; , ; ; And (3) flood season: ; ; ≥20; , ; ; Wherein, the Is the storage capacity below the normal water storage level, For the storage capacity below the emergency emptying water level, For the number of units in normal operation, The full flow rate of the single unit of the water turbine is achieved, The load rate of a single unit of the water turbine is, For a normal water storage level, For an emergency emptying of the water level, Is a full-protection basin water-blocking head, Is the height of the bottom of the full-protection basin, For the area of the reservoir basin corresponding to the emergency emptying water level, Is the area of the warehouse basin corresponding to the height of the warehouse bottom of the full-protection warehouse basin, In order to check the storage capacity below the water level, To check the water level.
12. The method for calculating the emergency emptying capacity of the full-protection basin of the pumped storage power station according to claim 1, wherein the core field of the emergency emptying capacity result calculation table comprises a period, a working condition type, the number of units, a load rate, an emergency emptying water level, an emptying time, a water head reduction value, a water head reduction rate, a reservoir capacity emptying rate, a compliance judgment result and a disqualification item description.

Description

Calculation method for emergency emptying capacity of full-protection basin of pumped storage power station Technical Field The invention belongs to the technical field of water conservancy and hydropower engineering, and particularly relates to a calculation method of the full-protection basin emergency emptying capacity of a pumped storage power station. Background With the continuous promotion of the construction of a novel power system, a pumped storage power station is used as a core peak regulation energy storage facility, and the full-protection basin-type upper reservoir structure of the pumped storage power station has the remarkable advantage, so that the engineering application in a terrain-limited area is wider. The structure has the core advantages of small drainage basin area (only receiving and storing local heavy rain in the basin), no need of arranging special drainage buildings such as spillways/spillways, and small occupied area. The core feature of the basin is that the emergency emptying path is unique, which is to rely on the water delivery power generation system completely, and the water is delivered to the lower reservoir for storage through the water pump turbine, without other independent water discharge channels, which is essentially different from the conventional reservoir with special water discharge building. However, the current reservoir emptying capacity calculation technology has significant limitations, and is difficult to adapt to the special requirements of the full-protection reservoir basin, and the specific following steps are included: (1) The adaptability is insufficient, the existing methods are developed aiming at a conventional reservoir provided with a water discharge building, the core calculation logic is constructed around the overflow capacity of the water discharge building, and the structural characteristics of the full-protection reservoir basin, such as "the air discharge dependent unit flow and no independent water discharge channel", cannot be matched, so that the calculation result and the engineering actual deviation are obvious. (2) The existing method does not distinguish the difference of the reservoir capacity boundaries of the flood season/non-flood season (the flood season needs to take reservoir capacity below the check water level as a reference, the non-flood season needs to take reservoir capacity below the normal water level as a reference), the working condition coverage is single, the running scenes of different units and different load rates of the unit are not refined, and the complex requirement of multiple working conditions in engineering is difficult to meet. (3) The core attribute is not integrated, the existing method does not integrate the core attribute of the full-protection basin, such as small basin area, no special drainage building, emergency emptying realization depending on a water delivery power generation system, and the corresponding emergency emptying capacity requirement into a calculation flow, and cannot directly verify whether the emergency emptying capacity meets the engineering requirement or not, thereby bringing hidden danger to engineering safety. (4) The logic lacks of standardization, and the calculation logic of the existing method lacks of uniformity and standardization, so that a standardized calculation system is difficult to form, and the reliability and the universality of the result are further affected. In view of this, the present invention has been made. Disclosure of Invention In order to solve the technical problems in the prior art, the invention provides a calculation method for the full-protection basin emergency emptying capacity of the pumped storage power station, which solves the problem of large actual deviation between the traditional method and engineering, improves the operation safety of the power station, and obviously reduces the cost of industrial design and research and development. In order to achieve the above purpose, the technical scheme of the invention is as follows: a calculation method for the emergency emptying capacity of a full-protection basin of a pumped storage power station comprises the following steps: s1, determining basic parameters of a full-protection reservoir basin; S2, dividing emergency emptying working conditions of the unit; S3, calculating emergency emptying time, a water head reduction value, a water head reduction rate and a reservoir capacity emptying rate under each working condition; and S4, verifying whether the emptying capacity meets the requirement, and outputting emergency emptying capacity result calculation tables under different working conditions. Further, the security basin foundation parameters include: Checking water level, normal water storage level, dead water level, emergency emptying water level, checking reservoir capacity below the water storage level, dead reservoir capacity below the normal water storage level, adjusting res