Battery State-of-Charge Control for Extended Off-Grid Backup
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing backup power supply systems struggle to sustain battery charge at an operable range during extended power outages or when disconnected from the utility grid, leading to insufficient power supply and potential harm to energy storage devices.
Innovation Solution
An electrical system with an energy control system that manages the state of charge of an energy storage system by selecting from three modes of operation: normal, hibernation, and suspension, based on current time, state of charge, and discharge rate, to optimize battery life and ensure extended backup power capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the battery operates continuously to meet load demand during extended power outages, then the power supply duration is extended, but the battery state of charge drops below operable ranges causing harm to energy storage devices and curtailing battery lifetime
Solution Approach 1:
The system dynamically switches between three operational modes (normal mode, hibernation mode, and suspension mode) based on real-time state of charge levels and load conditions. This dynamic adjustment allows the battery to extend power duration during critical periods while preserving minimum charge levels to maintain operability and prevent damage, thereby resolving the contradiction between extended backup duration and battery reliability.
2Duration of action of moving object
If the battery discharges completely to maximize backup time, then the power supply duration is extended, but the battery lifetime is curtailed due to deep discharge harm
Solution Approach 1:
The system performs preliminary action by establishing minimum state of charge thresholds before complete discharge occurs. The controller monitors state of charge levels and transitions to hibernation or suspension modes proactively when thresholds are approached, preventing deep discharge damage before it happens. This preliminary protective action extends battery lifetime while still maximizing usable backup duration within safe operating limits.
3Reliability
If the battery maintains high state of charge to ensure sufficient power availability, then the power supply reliability is improved, but the battery may discharge too quickly during extended outages
Solution Approach 1:
The system implements periodic action through scheduled mode transitions based on state of charge thresholds. Instead of maintaining a constant high charge level, the battery operates in cycles of normal discharge mode followed by hibernation or suspension modes when thresholds are reached. This periodic cycling ensures sufficient power availability during active periods while extending overall backup duration through strategic charge preservation phases, resolving the contradiction between reliability and duration.
Data Source
AI summary
The present disclosure provides a system and method for managing the state of charge of an energy storage system that is used as a backup power supply source in an electrical system. The energy storage system can operate in a selected mode of operation that includes a normal mode, a hibernation mode, and a suspension mode. A controller of the energy control system can determine the selected mode of operation for the energy storage system based on the current time of the day and electronic data related to a backup PV power generation system, the energy storage system, and a plurality of loads.