Outlet-Connected Energy Storage Switching for Grid Return Sync
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Solution Overview
Problem
Existing energy storage systems risk damage due to inconsistent signal synchronization between commercial AC power and battery-generated AC power when commercial AC power is restored after an outage, and require complex installation involving a distribution box.
Innovation Solution
An energy storage system with an AC/DC converter, booster, DC/AC converter, power controller, inductor, switching part, current determination part, and switching controller that allows seamless transition between commercial AC power and battery AC power, preventing damage during power restoration and eliminating the need for a distribution box installation by using an input/output terminal and connecting directly to an outlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the energy storage system uses commercial AC power and battery AC power simultaneously, then the power supply stability is improved, but the system may be damaged when commercial AC power is restored after power outage due to signal synchronization inconsistency
Solution Approach 1:
The switching controller preemptively detects the restoration of commercial AC power after an outage and提前 controls the switching part to stop battery AC power output before synchronization issues occur, preventing system damage while maintaining power supply stability
Solution Approach 2:
The system continuously monitors the synchronization status between commercial AC power and battery AC power through feedback mechanisms, and the switching controller adjusts the switching part based on real-time synchronization detection to prevent harmful effects
2Ease of manufacture
If the energy storage system is connected through a distribution box with separate input and output terminals, then the power conversion and distribution is improved, but the installation complexity increases
Solution Approach 1:
The patent combines the input terminal and output terminal into a single input/output terminal that can handle both commercial AC power input and battery AC power output, eliminating the need for a distribution box and reducing installation complexity while maintaining full power conversion functionality
Solution Approach 2:
The input/output terminal is designed with multi-functionality to serve as both input and output interface, allowing the system to accept commercial AC power and deliver battery AC power through the same terminal, simplifying installation without compromising power management capabilities
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
Ensures continuous and stable AC power supply to loads using both commercial and battery power without damaging the system during power restoration and simplifies installation by eliminating the need for a distribution box.
Implementation Method 1
an AC/DC converter configured to receive commercial AC power, which is grid power, through an input/output terminal and convert the commercial AC power into DC power
Implementation Method 2
a DC/AC converter configured to convert the boost DC voltage into AC power and supply battery AC power to a load through the input/output terminal
Data Source
AI summary
An energy storage system comprises: an alternating-current/direct-current converter; a battery; a booster; a direct-current/alternating-current converter; a power control unit; an inductor having one terminal connected to a supply terminal to which normal alternating-current power is supplied; a switching unit having one terminal connected to the other terminal of the inductor and having the other terminal connected to an input/output terminal; a current determination unit which compares an inductor current flowing through the inductor with a power recovery limit current determined by a user; and a switching control unit.