Three-Machine Pumped Storage Unit Power Regulation Method
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Solution Overview
Problem
Conventional mixed flow reversible pumped storage units face challenges in regulating pumping power, especially at sites with higher water heads and energy densities, limiting their flexibility in serving renewable energy systems.
Innovation Solution
A method for determining the regulation range of pumping power in a three-machine pumped storage unit, involving the use of a generator, water pump, and hydraulic turbine, where parameters such as gravitational acceleration, water head, inflow, and power absorbed by the grid are used to establish relational expressions that characterize the pumping process efficiency and power distribution, enabling flexible regulation of pumping power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mixed flow reversible unit is used for pumped storage, then the unit is widely applicable with working head of 30-800m, but the unit cannot be regulated in power when operating as a water pump
Solution Approach 1:
The patent segments the pumping function into two independent components: the water pump machine and the hydraulic turbine. The water pump handles the main pumping operation, while the hydraulic turbine can be independently controlled to regulate power output by adjusting its guide vane opening. This segmentation allows the pumped storage unit to maintain pumping function while gaining power regulation capability through the turbine component.
Solution Approach 2:
The hydraulic turbine serves multiple functions: it can operate as a power generation turbine during power production mode, and simultaneously serve as a power regulation device during pumping mode. By making the turbine multi-functional, the system achieves both pumping capability and power regulation capability without requiring separate dedicated equipment for each function.
2Stability of the object's composition
If the hydraulic turbine operates at constant power during pumping, then the pumping process is stable, but the pumping power cannot be flexibly regulated according to power grid requirements
Solution Approach 1:
The patent introduces dynamic control of the hydraulic turbine's guide vane opening to enable flexible power regulation. By dynamically adjusting the turbine's power output based on grid requirements, the system can flexibly regulate the portion of pumping power drawn from the grid, transforming the previously static constant-power operation into a dynamic, adaptable system that responds to changing grid conditions.
3Ease of operation
If a three-machine unit configuration is used, then power regulation becomes possible, but the shaft system structure becomes more complex
Solution Approach 1:
The patent merges the generator with the hydraulic turbine shaft, creating a combined generator-hydraulic turbine unit that shares a common shaft. This merging reduces the overall structural complexity compared to having completely separate machines, while still maintaining the three-machine configuration's power regulation capability. The shared shaft system simplifies the mechanical connection and reduces the number of independent rotating components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances the flexibility of pumped storage power stations to serve the power grid by allowing for the regulation of pumping power, simplifies the shaft system structure, reduces construction costs, and improves operational stability.
Implementation Method 1
pumping water from a lower reservoir to an upper reservoir... power absorbed by a power grid
Implementation Method 2
the other end connected to the hydraulic turbine... determining a regulation range of pumping power
Data Source
AI summary
A method for determining a regulation range of pumping power of a three-machine pumped storage unit is provided. The method includes: obtaining a first parameter set of pumping measurement parameters for characterizing the three-machine pumped storage unit and determining a pumping process efficiency; determining a first relational expression based on the pumping process efficiency and a design efficiency of a pumped storage power station and establishing a second relational expression; and determining a third relational expression based on power absorbed by a power grid and the second relational expression and determining a fourth relational expression, where the fourth relational expression reflects the regulation range of the pumping power of the three-machine pumped storage unit. The method for determining the regulation range of the pumping power of the three-machine pumped storage unit is proposed according to unit characteristics and operating economy of the power station.