Power Control System for Energy Storage Devices
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Solution Overview
Problem
The existing power control systems for energy storage devices require multiple DC-DC converters, leading to increased costs and efficiency losses due to power loss, as each converter is needed for individual energy storage devices, necessitating a solution to reduce the number of converters.
Innovation Solution
A power control system that connects multiple energy storage devices to a power system or renewable energy source using a single DC-DC converter for one device and indirect voltage control for the others, reducing the need for multiple converters by using a control device to manage voltages based on the state of charge and required voltages of the energy storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple DC-DC converters are used for each energy storage device, then individual voltage control is achieved, but device complexity and cost increase
Solution Approach 1:
The patent merges the voltage control functions of multiple energy storage devices into a single DC-DC converter. The converter simultaneously manages multiple energy storage devices by dynamically adjusting switching duties of different switch groups, eliminating the need for separate converters for each device while maintaining individual voltage control capabilities.
Solution Approach 2:
The single DC-DC converter is designed with multi-functionality to handle voltage control for multiple different energy storage devices. By incorporating multiple switch groups that can be selectively activated, the converter universally serves multiple devices with different voltage requirements through a unified control mechanism.
2Ease of operation
If multiple DC-DC converters are installed, then each energy storage device can be controlled independently, but power loss increases
Solution Approach 1:
By consolidating control functions into one converter, the patent reduces the total number of power conversion stages. This merging eliminates redundant power losses that would occur in multiple separate converters, while the independent control capability is maintained through selective activation of different switch groups for different energy storage devices.
3Measurement precision
If multiple DC-DC converters are used, then voltage control precision is maintained, but installation cost increases
Solution Approach 1:
The patent achieves cost reduction by merging multiple converter functions into a single device, directly lowering installation and material costs. Voltage control precision is maintained through sophisticated control methods that dynamically adjust switching duties of different switch groups, ensuring accurate voltage regulation for each energy storage device despite the consolidated hardware approach.
Data Source
AI summary
Disclosed is a power control system for a plurality of energy storage devices, including: a first converter configured to perform a voltage conversion, the first converter having one end connected to a first power system and another end connected to a direct current (DC) linker; a second converter configured to perform a voltage conversion, the second converter having one end connected to a second power system and another end connected to the DC linker; a first energy storage device configured to store electric energy; a direct current-to-direct current (DC-DC) converter configured to perform a voltage conversion, the DC-DC converter having one end connected to the first energy storage device and another end connected to the DC linker; a second energy storage device connected to the DC linker and configured to store electric energy, and a control device.