Y-Connected Battery Power Supply for AC Output Balancing
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Solution Overview
Problem
Existing power supply systems using battery strings primarily output direct-current power, limiting their applicability and increasing costs, as they do not efficiently provide alternating-current power, which is necessary for broader applications.
Innovation Solution
A power supply system that outputs alternating-current power using a Y-connected U-phase, V-phase, and W-phase battery strings with high energy density, combined with a first battery string of high output density, utilizing an inverter to convert direct-current power to alternating-current power, and a control device for power balancing and battery management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power supply system uses a battery string to output direct-current power, then the system can be implemented with existing technology, but the applicable range is limited and costs increase
Solution Approach 1:
The battery string system is designed to perform multiple functions: it can output both direct-current power (through the first power supply circuit) and alternating-current power (through the alternating-current sweep unit). This multi-functionality allows the same battery string to serve diverse applications, thereby expanding the applicable range without proportionally increasing costs
2Adaptability or versatility
If alternating-current power is output using a battery string, then the applicable range increases, but the system efficiency decreases due to the alternating-current sweep unit
Solution Approach 1:
The power supply system is divided into two separate functional segments: the first power supply circuit for direct-current output and the alternating-current sweep unit for alternating-current output. This segmentation allows each component to be optimized for its specific function, enabling the system to expand applicability through alternating-current capability while managing efficiency losses by isolating them to only the alternating-current path
3Loss of energy
If batteries with high energy density are used in the alternating-current sweep unit, then the system can operate efficiently at low rates, but the maximum output power is reduced
Solution Approach 1:
Different battery characteristics are assigned to different parts of the system: batteries with high energy density are used in the alternating-current sweep unit for efficient low-rate operation, while batteries with high output density are used in the first power supply circuit for maximum power delivery. This local differentiation of battery quality allows each subsystem to operate optimally for its intended function
4Loss of energy
If the first power supply circuit converts direct-current to alternating-current using an inverter, then alternating-current power can be output efficiently, but the device complexity increases
Solution Approach 1:
The system segments the power conversion functions into two distinct paths: direct conversion for direct-current output and inverter-based conversion for alternating-current output. This segmentation isolates the complexity of the inverter circuit to only the alternating-current path, allowing efficient conversion where needed while keeping the direct-current path simple
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 configuration enables efficient and stable output of alternating-current power, reducing costs by utilizing batteries with high energy and output densities in their respective roles, allowing for high output and capacity power supply while minimizing inefficiencies and overcharging risks.
Implementation Method 1
a first power supply circuit that converts output of a direct-current sweep unit including a first battery string to alternating-current power using an inverter
Data Source
AI summary
A power supply system comprises an alternating-current sweep unit that outputs alternating-current power from a U-phase battery string, a V-phase battery string, and a W-phase battery string that are Y-connected, a first power supply circuit that converts output of a direct-current sweep unit to alternating-current power using an inverter and outputs the alternating-current power, the direct-current sweep unit including a first battery string; and a control device. An energy density of a battery included in the U-phase battery string, the V-phase battery string, and the W-phase battery string is higher than an energy density of a battery included in the first battery string.