Gravity Block Energy Storage for Reliable Renewable Power
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Solution Overview
Problem
The intermittency and unpredictability of renewable energy sources, such as solar and wind power, limit the reliable delivery of electricity to the grid, necessitating an efficient energy storage system to capture and store energy for predictable power distribution.
Innovation Solution
A gravity-driven energy storage system utilizing a crane to stack and unstack blocks, converting electrical energy into potential energy during abundance and generating electricity through kinetic energy when needed, with a grabber mechanism for precise block handling and a motor-generator for efficient energy conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If renewable energy sources (solar, wind) are used for power generation, then clean energy production increases, but intermittency and unpredictability limit reliable electricity delivery to the grid
Solution Approach 1:
The system performs preliminary action by stacking blocks to store gravitational potential energy during periods when renewable energy is abundant (daylight hours for solar). This pre-stored energy is then released during off-peak hours when renewable generation is insufficient, ensuring reliable electricity delivery to the grid regardless of intermittent conditions.
2Reliability
If a gravity-driven block stacking system is used for energy storage, then energy can be stored and released predictably, but the device complexity increases due to crane and block handling mechanisms
Solution Approach 1:
The system employs self-service principles where the gravitational force naturally serves to both store and release energy. Blocks are passively stacked to store energy and then passively descend to generate electricity, with the gravity field providing the service of energy conversion without requiring active control during the energy release phase.
Solution Approach 2:
The crane system serves multiple functions: it lifts blocks for energy storage, positions blocks for optimal stacking, and can control the block descent for electricity generation. This multi-functionality reduces the need for separate specialized mechanisms for each operation.
3Quantity of substance
If blocks are stacked to high elevations for maximum energy storage, then energy storage capacity increases, but the risk of block instability and system failure increases
Solution Approach 1:
The energy storage system divides the total energy storage capacity into multiple discrete block units rather than using a single large mass. Each block is independently handled, positioned, and stacked, allowing for modular energy storage where stability can be managed at the individual block level rather than requiring the entire stack to be perfectly stable.
Solution Approach 2:
The crane system acts as an intermediary between the ground-level block storage area and the elevated stacking position. It provides controlled, precise placement of each block, ensuring proper alignment and stability before releasing the block. This intermediary control mechanism prevents instability issues that would arise from uncontrolled dropping or placement.
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 effectively stores renewable energy as potential energy during peak production hours and converts it into electricity during off-peak hours, providing a stable and efficient means to deliver electricity to the grid, with minimal maintenance requirements and high energy storage capacity.
Implementation Method 1
move one or more blocks from a lower elevation to a higher elevation to store energy (e.g., via the potential energy of the block in the higher elevation)
Implementation Method 2
move one or more blocks from a higher elevation to a lower elevation under the force of gravity
Implementation Method 3
generate electricity (e.g., via the kinetic energy of the block when moved to the lower elevation)
Data Source
AI summary
An energy storage system includes a crane and a plurality of blocks, where the crane is operable to move blocks from a lower elevation to a higher elevation (via stacking of the blocks) to store electrical energy as potential energy of the blocks, and then operable to move blocks from a higher elevation to a lower elevation (via unstacking of the blocks) to generate electricity based on the kinetic energy of the block when lowered (e.g., by gravity). The energy storage system can, for example, store electricity generated from solar power as potential energy in the stacked blocks during daytime hours when solar power is available, and can convert the potential energy in the stacked blocks into electricity during nighttime hours when solar energy is not available, and deliver the converted electricity to the power grid.