Battery String AC Output Using Y-Connected Three-Phase Configuration
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Solution Overview
Problem
Existing electric power supply systems using battery strings primarily output direct current power, limiting their applications and increasing costs, as no technology effectively converts battery strings to output alternating current power.
Innovation Solution
An electric power supply system that utilizes a Y-connected U-phase, V-phase, and W-phase battery string configuration with an alternating current sweep unit and an inverter to convert direct current power from a high-output density battery string into alternating current power, allowing for efficient output and stabilization of current and voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a battery string is used to output direct current electric power, then the system structure is simple and cost is reduced, but the range of applications is limited and alternating current output capability is lost
Solution Approach 1:
An inverter is introduced as an intermediary device between the battery string and the external AC power supply. The inverter converts DC power from the battery string into AC power, enabling the battery string to supply power to AC-based external devices and grids while maintaining the simplicity of the battery string itself
Solution Approach 2:
The battery string system is designed to perform multiple functions: it can directly supply DC power to DC-based external power supplies, and through the inverter, it can also supply AC power to AC-based external power supplies. This multi-functionality expands the range of applications without requiring multiple separate power supply systems
2Power
If high output density batteries are used in the direct current battery string, then power output capability is improved, but energy storage capacity is reduced
Solution Approach 1:
The power supply system is segmented into two distinct battery strings: a DC battery string using high output density batteries for power output, and an AC battery string using high energy density batteries for energy storage. Each string is optimized for its specific function, and they work together through the inverter to provide both high power and high capacity performance
Solution Approach 2:
Different battery types with different characteristics are used in different parts of the system. The DC battery string uses high output density batteries where power delivery is critical, while the AC battery string uses high energy density batteries where energy storage is critical. Each local component is optimized for its specific quality requirement
3Reliability
If alternating current electric power is output from both the alternating current sweep unit and the alternating current electric power supply circuit simultaneously, then current stabilization is improved, but system complexity and control difficulty increase
Solution Approach 1:
The control device is configured to manage the operation sequence in advance: initially both the AC sweep unit and AC power supply circuit operate together to stabilize current, then after a predetermined period, the AC power supply circuit stops outputting and only the AC sweep unit continues. This pre-planned operation sequence ensures current stabilization while controlling system complexity through automated timing-based switching
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
Enables the expansion of battery string applications by outputting alternating current power, reducing costs through the combination of high-output and high-capacity batteries, and stabilizing current and voltage efficiently.
Implementation Method 1
an alternating current electric power supply circuit configured to convert an output of a direct current sweep unit including a direct current battery string into alternating current electric power using an inverter
Data Source
AI summary
An electric power supply system includes an alternating current electric power supply circuit that converts direct current electric power of a first direct current sweep unit including a battery string into alternating current electric power using a first inverter and outputs it, and an alternating current sweep unit that includes a U-phase battery string, a V-phase battery string, and a W-phase battery string that are Y-connected. Output densities of batteries of the battery string are higher than output densities of batteries of the alternating current sweep unit. Alternating current electric power is output from the alternating current sweep unit and the alternating current electric power supply circuit, and after a predetermined period elapses, the output of the alternating current electric power from the alternating current electric power supply circuit is stopped.