Hybrid Ship Power Storage System for Load Variation
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Solution Overview
Problem
Ships face power load variations that can cause engine tripping and harmful emissions, and existing power storage devices, like secondary batteries, have low power density, requiring large installations that are impractical in terms of space and cost.
Innovation Solution
A power system utilizing a first power storage device with high energy density and a second with high power density, controlled by a system that prioritizes charging/discharging based on application needs, estimated using machine learning, to optimize energy and power usage, reducing the total size of power storage devices needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large-sized secondary batteries are installed to compensate for load variation, then the power storage capacity is improved, but the installation space and cost increase significantly
Solution Approach 1:
The patent combines two different power storage devices (first power storage device with high energy density and second power storage device with high power density) into a hybrid system. This merging allows the system to leverage the complementary strengths of both devices: the first device provides extended energy capacity for load variation compensation, while the second device delivers high power for instantaneous demands, thereby achieving reliable load compensation without requiring a single oversized battery installation.
Solution Approach 2:
The patent changes the parameter composition of the power storage system by selecting devices with different energy density and power density characteristics. The control system dynamically adjusts the operating parameters (charging/discharging priorities) based on real-time power demands, switching between the two devices optimally. This parameter-based differentiation allows the system to achieve both high energy capacity and high power output without proportionally increasing installation space.
2Power
If high power is required for load variation compensation, then the power output capability is improved, but the power storage device size increases due to low power density
Solution Approach 1:
The patent merges a first power storage device optimized for energy density with a second power storage device optimized for power density. The control system coordinates both devices to meet high power demands: the second device provides instantaneous high power output for rapid response to load variations, while the first device supplies sustained energy. This combination achieves high power output capability without requiring a single large-volume power storage device.
Solution Approach 2:
The patent utilizes parameter differentiation by selecting power storage devices with distinct power density characteristics. The control system dynamically changes operating parameters (charging/discharging priorities) based on power demand levels, prioritizing the high power density device when peak power is needed and the high energy density device for sustained lower power demands. This parameter-based control achieves high power output without proportionally increasing device volume.
3Use of energy by moving object
If secondary batteries are used for power supply, then the energy storage capacity is improved, but the power density remains low requiring larger installations
Solution Approach 1:
The patent combines a first power storage device with high energy density (such as secondary batteries) and a second power storage device with high power density (such as capacitors). This merging creates a hybrid system where the first device provides substantial energy storage capacity for extended operation, while the second device delivers high power density for instantaneous power demands. The control system coordinates both devices to optimize the balance between energy storage and power delivery, achieving both high energy capacity and high power density without requiring a single oversized installation.
Solution Approach 2:
The patent changes the parameter composition of the power storage system by incorporating devices with different energy density and power density characteristics. The control system dynamically adjusts operating parameters (charging/discharging priorities) based on real-time power and energy demands. When sustained energy supply is needed, the high energy density device is prioritized; when instantaneous power is needed, the high power density device is prioritized. This parameter-based differentiation allows the system to achieve both high energy storage capacity and high power density without requiring larger installations.
Data Source
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AI summary
A power system of a ship includes a first power storage device, a second power storage device, and a control system. The first power storage device has an energy density higher than that of the second power storage device. The second power storage device has a power density higher than that of the first power storage device. The control system is configured to: as a power generator application, prioritize discharging the first power storage device over discharging the second power storage device, such that base power is continuously supplied to an onboard electrical load connected to an onboard bus; and as a grid stabilization application, prioritize charging/discharging the second power storage device over charging/discharging the first power storage device to compensate for frequency variation or voltage variation of an onboard power grid.