Pumped storage power station unit matching method suitable for cascade development
By employing Pelton turbines for unit matching in pumped storage power stations, the method addresses the inefficiencies of existing technologies, reducing costs and improving adaptability to new energy sources by optimizing unit selection and energy storage for heads over 1,000 meters.
Patent Information
- Application Number
- CN202311328815.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-15
- Publication Date
- 2024-12-27
AI Technical Summary
Existing pumped-storage power stations face challenges in efficiently managing heads exceeding 1,000 meters, requiring complex unit selections and increased investment due to the limitations of reversible mixed-flow pump-turbine units and Pelton turbines, and they struggle to match the energy storage needs of new energy sources like photovoltaic and wind power generation.
The method involves using Pelton turbines at all levels for unit matching in cascade developed pumped storage power stations, allowing for reduced unit stages and optimized energy storage to adapt to new energy sources by shortening pumping time and extending power generation time.
This approach reduces investment costs and enhances the adaptability of pumped-storage power stations to new energy sources by optimizing unit selection and energy storage characteristics, particularly for heads exceeding 1,000 meters.
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of pumped storage power stations, in particular to a method for matching pumped storage power station units suitable for cascade development. Background Art
[0002] Existing pumped-storage power stations mostly use reversible mixed-flow pump-turbine units, and their applicable head range is up to about 700 meters. For sites with cascade development heads exceeding 1,000 meters, it is necessary to choose between reversible mixed-flow pump-turbine units or Pelton turbines and their combination. Summary of the invention
[0003] The head of the cascade developed pumped storage power station will exceed 1000 meters. In terms of unit selection, a reversible mixed flow pump turbine unit, a Pelton turbine unit, or a combination of the two units can be used. The present invention is a method for matching units of a cascade developed pumped storage power station, which adopts the technical measure of using Pelton turbines at all levels. Compared with the use of a reversible mixed flow pump turbine unit or other combination methods, the differences and advantages are as follows: 1. According to the different working head ranges of the prior art, for cascade development pumped-storage power stations with a head of 1,000 meters, a first-stage Pelton turbine can be used, and one set of units can be used. A reversible mixed-flow pump-turbine unit must use a second stage, two sets of units. For cascade development pumped-storage power stations with a working head of 2,000 meters, considering the maximum head capacity limitations of existing pumps and the difficulty of manufacturing water inlet valves, a second-stage arrangement can be selected for the Pelton turbine, and two sets of units can be used. A three-stage arrangement must be used for the reversible mixed-flow pump-turbine unit, and three sets of units are required. As the head increases, the difference between the two becomes greater. The use of the method of the present invention will effectively reduce the investment in pumped-storage power station units.
[0004] 2. With the further improvement of the applicable range of pump head and working head of inlet valve, there is room for further reduction of the stages of Pelton turbine units, which cannot be achieved by reversible mixed flow pump turbine units.
[0005] 3. Energy storage facilities that match new energy photovoltaic and wind power generation need to have the characteristics of "fast charging" and "slow discharging". For pumped storage power stations, this means shortening the pumping time and extending the power generation time. Pumped storage power stations using pelton turbines have a separate pumping pump system, and the pumping power can be greater than the power generation power. The effect is to shorten the pumping time, which will better adapt to the characteristics of new energy power generation. For the 3-4 hour peak of photovoltaic power generation at noon and the hourly peak of wind turbines at night, it is easier to obtain more low-priced pumping electricity prices in the real-time trading power spot market to reduce pumping operation costs.
Claims
1. A method for matching pumped storage power station units suitable for cascade development, characterized in that: Pelton turbine units are used at all levels of cascaded pumped-storage power stations.