EV-to-Home AC Coupling for Longer Backup Power
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Solution Overview
Problem
Household energy storage systems face limitations in backup power duration due to the high cost of large capacity batteries and the inefficiency of integrating electric vehicle (EV) batteries, which cannot directly supply synchronized AC power to the household electricity grid.
Innovation Solution
An AC-to-AC power converter is used to synchronize the EV's AC power with the household electricity grid, allowing the energy stored in EV batteries to be coupled with the household energy storage system, extending backup duration during outages and enabling energy feed-back to the grid during peak hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If large capacity batteries are used to provide sufficient backup power during electricity grid outage, then backup power duration is improved, but system cost increases significantly
Solution Approach 1:
The patent combines EV batteries with the household energy storage system to create a hybrid energy storage configuration. The EV battery pack serves as an additional energy source that can supplement the primary household battery during grid outages, extending backup power duration without requiring a proportionally larger primary battery installation.
Solution Approach 2:
The EV battery pack serves multiple functions: it acts as an energy storage device for backup power, a controllable load for grid support, and a mobile energy reservoir that can be charged during off-peak hours and discharged during peak demand or outage periods, providing versatile energy management capabilities.
2Quantity of substance
If EV batteries are integrated into the household energy storage system, then energy capacity is improved, but system complexity increases due to synchronization requirements
Solution Approach 1:
The patent introduces a bidirectional converter as an intermediary device between the EV battery pack and the household energy storage system. This converter handles the complex tasks of voltage matching, frequency synchronization, and power flow control, isolating the synchronization complexity from the main system while enabling seamless integration of the EV battery.
Solution Approach 2:
The bidirectional converter dynamically adjusts electrical parameters including voltage, current, and frequency to match the grid and household system requirements. The system can switch between different operating modes (charging, discharging, grid-tied, islanded) by changing these parameters in real-time based on system conditions.
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
The solution enhances backup power duration and enables profit-making by stabilizing the electricity grid, leveraging the larger energy capacity of EV batteries efficiently.
Implementation Method 1
connecting an alternate current (AC) output from an electric vehicle (EV) to a household electricity grid through an AC-to-AC power converter capable of outputting a vehicle-to-load (V2L) AC power that is synchronized to the household electricity grid
Data Source
AI summary
An energy coupling method for household energy storage includes: connecting an alternate current (AC) output from an electric vehicle (EV) to a household electricity grid through an AC-to-AC power converter capable of outputting a vehicle-to-load (V2L) AC power that is synchronized to the household electricity grid; in response to an outage of an electricity grid that supplies power to the household grid, turning on the AC-to-AC power converter to supply the V2L AC power to a household load connected to the household electricity grid; and in response to a recovery of the electricity grid, turning off the AC-to-AC power converter to stop outputting the V2L AC power.