Multi-port Energy Storage System with Independent AC Ports
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Solution Overview
Problem
Conventional energy storage systems are limited to single AC ports and functions, making them inflexible and unable to supply multiple levels or classifications of power quality, which restricts their operational versatility and requires multiple systems for different power quality needs.
Innovation Solution
A multi-port energy storage system is designed with a bidirectional power conversion circuit and DC-AC inverter circuits to create multiple AC ports, allowing for flexible power quality supply by utilizing a first AC port dependent on utility power and a second AC port with independent power quality, simplifying the system structure and eliminating the need for multiple single-port systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional single-port energy storage system is used, then the system structure is simple, but the system cannot supply multiple levels of power quality and requires multiple separate systems for different power quality needs
Solution Approach 1:
The energy storage system is designed with multiple AC ports (first AC port connected to utility power source, second AC port independent from utility power source) that can simultaneously provide different power quality levels. The bidirectional power conversion circuit and DC-AC inverter circuit enable the system to perform multiple functions including charging from utility, discharging to utility, and independent power supply to loads, making a single system capable of replacing multiple separate systems.
2Adaptability or versatility
If multiple single-port energy storage systems are deployed to provide different power qualities, then the power quality needs are met, but the overall system complexity and cost increase
Solution Approach 1:
The patent combines multiple single-port energy storage systems into a single multi-port system by integrating bidirectional power conversion circuits and DC-AC inverter circuits. The first AC port handles utility-connected operations while the second AC port provides independent power quality, merging the functionality of what would otherwise require separate systems into one unified structure.
3Productivity
If the AC switch is switched on to connect utility power source, then the bidirectional power conversion circuit can charge the energy storage facility, but the system cannot simultaneously provide independent power quality to the second AC port
Solution Approach 1:
The system employs dynamic switching control where the AC switch can be selectively turned on or off based on operational requirements. When the AC switch is on, the system operates in grid-connected mode for charging or power arbitrage. When the AC switch is off, the system operates in islanded mode providing independent power quality through the DC-AC inverter circuit to the second AC port, allowing flexible adaptation to different operational scenarios.
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 multi-port energy storage system effectively supplies various levels of power quality through multiple AC ports, enhancing flexibility and simplifying the system structure while providing clean and stable power independent of utility power source conditions.
Implementation Method 1
an AC power supplied from the utility power source 10 is converted into a DC power by the bidirectional power conversion circuit 11
Implementation Method 2
a DC power of the electric energy storage facility 12 is converted into an AC power supplying to the load 13 via the bidirectional power conversion circuit 11
Data Source
AI summary
A multi-port energy storage system includes a bi-directional power conversion circuit, a DC-AC inverter circuit, an electric energy storage facility, a first AC port, a second AC port and an AC switch. The multi-port energy storage system controllably provides various classifications of power supply quality via the first AC port and the second AC port.