AC Multi-Phase Energy Storage Load Balancing by Output Voltage
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Solution Overview
Problem
Energy storage power supply systems with multiple independent units suffer from shortened endurance and inconsistent power consumption due to battery inconsistencies, leading to premature shutdowns and potential damage to electrical devices when connected to unbalanced loads.
Innovation Solution
An electric quantity balance control method adjusts the output voltage of energy storage devices based on their remaining electric quantities to equalize power consumption, using a master-slave communication system to synchronize phase and voltage adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent energy storage power supplies are used to form an AC multi-phase system, then the system can provide power supply for various loads including stand-alone loads, but the overall endurance is greatly shortened due to battery inconsistency
Solution Approach 1:
The patent merges multiple energy storage power supplies into a coordinated multi-phase system with a unified control strategy. Instead of operating independently, the power supplies are combined under a common control framework that monitors and adjusts their output based on real-time battery states of charge, enabling them to work together as an integrated system that optimizes overall endurance while maintaining load adaptability.
Solution Approach 2:
The patent implements dynamic adjustment of output power for each energy storage power supply based on real-time battery states of charge. The control method continuously monitors SOC levels and dynamically modifies the operating parameters of each unit, allowing the system to adapt its power distribution strategy to current battery conditions, thereby extending overall system endurance while maintaining versatility.
2Ease of operation
If energy storage power supplies operate independently with unbalanced stand-alone loads, then each unit can serve its connected load, but power consumption becomes inconsistent leading to premature shutdown
Solution Approach 1:
The patent implements a feedback mechanism where the control device continuously monitors the state of charge of each energy storage power supply and the power consumption of connected loads. Based on this feedback information, the system dynamically adjusts the output power of each unit to maintain consistent discharge rates, preventing premature shutdown and ensuring reliable operation while preserving independent operational capability.
Solution Approach 2:
The patent changes the operating parameters (output power levels) of each energy storage power supply based on their individual battery states of charge and connected load requirements. By dynamically adjusting these parameters, the system maintains consistent power consumption across all units, thereby improving reliability while allowing each unit to continue operating independently with its connected load.
3Reliability
If the system shuts down when any one energy storage power supply runs out of power, then safety is maintained, but the overall system endurance is limited by the weakest unit
Solution Approach 1:
The patent enables continuous useful action from the overall system by coordinating multiple energy storage power supplies to operate in parallel. When one unit's battery approaches depletion, the control device redistributes the load to other units with higher remaining capacity, ensuring that the system continues to provide power supply without interruption. This coordination allows the system to utilize the combined capacity of all units, greatly extending overall endurance while maintaining safety through controlled operation.
Data Source
AI summary
An electric quantity balance control method includes: S1: obtaining remaining electric quantities of a plurality of energy storage devices; S2: calculating an average value of the remaining electric quantities of the plurality of energy storage devices; S3: subtracting the average value calculated in step S2 from the remaining electric quantity of each energy storage device to obtain a corresponding difference, and for each energy storage device, if the corresponding difference is greater than 0, increasing an output voltage of the energy storage device to increase its output power, otherwise if the corresponding difference is less than 0, reducing the output voltage of the energy storage device to decrease its output power. According to the energy storage device alternating current multi-phase system and the electric quantity balance control method therefor provided in the present invention, the problem of the overall endurance of the system being greatly shortened is effectively solved.