Ridgeline Cable Drive Energy Storage System
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Solution Overview
Problem
Current energy storage solutions, such as battery technologies and conventional gravitational potential energy storage devices, face limitations in scalability, efficiency, and cost-effectiveness, particularly in providing utility-scale energy storage capabilities with limited horizontal space and steep rail inclines, which are not universally available.
Innovation Solution
The ridgeline cable drive electric energy storage system employs multiple modules with funicular track sets and winch sets to transport masses between upper and lower storage yards, using electrical power to store energy as potential energy and convert it back into electricity, allowing for efficient energy storage and generation with adjustable power output and reduced installation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional gravitational potential energy storage devices use mechanical lifting devices to raise weights, then energy storage capability is achieved, but the system requires very large mass and results in high cost
Solution Approach 1:
The system divides the storage facility into upper and lower storage yards separated by a steep incline, with masses segmented into individual rail cars that can be independently loaded, transported, and unloaded. This segmentation allows the system to achieve energy storage capability without requiring a single extremely large mass, thereby reducing overall system cost while maintaining storage capacity.
2Power
If pumped storage hydro is used to store energy by pumping water uphill, then utility-scale energy storage is achieved, but energy losses exceed 20% and construction takes more than a decade
Solution Approach 1:
The system replaces the water pumping and turbine generation mechanism with a rail-based mechanical transport system using electric locomotives. Masses are lifted mechanically via rail cars on a steep incline and lowered back down to generate energy, eliminating the hydraulic losses inherent in pumped storage hydro while achieving comparable utility-scale energy storage capability.
3Loss of energy
If rail based energy storage systems operate on steep conventional rail grades, then energy storage efficiency is improved, but the system requires larger storage yards which are not available in certain geographic areas
Solution Approach 1:
The system transitions from horizontal storage yard expansion to vertical elevation utilization by employing a steep incline (up to 50 degrees) between upper and lower storage yards. This dimensional shift allows the system to achieve energy storage efficiency through vertical mass transport while minimizing the horizontal footprint, making it suitable for geographic areas with limited space.
4Power
If mechanical lifting devices are used to raise weights, then energy storage is achieved, but the system becomes expensive and uneconomical
Solution Approach 1:
The rail car system serves multiple functions: transporting masses uphill for energy storage, transporting masses downhill for energy generation, and potentially serving dual purposes with bidirectional capability. This multi-functionality reduces the need for separate systems for charging and discharging, thereby lowering overall system cost and improving economic viability while maintaining energy storage capability.
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 system enables efficient energy storage and generation capabilities ranging from 10 to 1,000 megawatts, offering high efficiency and reduced capital investment, while accommodating limited horizontal space and varying terrain, thus addressing the need for utility-scale energy storage with flexibility and cost-effectiveness.
Implementation Method 1
electrical power to store energy as potential energy
Implementation Method 2
convert it back into electricity
Data Source
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AI summary
A highly efficient, utility scale energy storage system employs large masses transported uphill to store energy and downhill to release energy. An electric powered cable winch or chain drive shuttles the masses between two storage yards of different elevations separated by a steep incline on rail vehicles supported by track and operated by an automated control system.