Shared Bidirectional DC/DC Circuit for Battery and EV Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The integration of photovoltaic, energy storage, and public power grid systems in conventional energy storage systems results in higher overall system costs due to the use of separate bidirectional DC/DC circuits for the energy storage battery and chargeable vehicle.
Innovation Solution
An energy storage system design where the energy storage battery and chargeable vehicle share a bidirectional DC/DC circuit, reducing the number of DC/DC circuits and optimizing the system configuration through controllable switches and a DC/AC circuit, allowing coordinated charging and discharging processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate bidirectional DC/DC circuits are used for energy storage battery and chargeable vehicle, then reliability and independence of each function is improved, but device complexity and overall system cost increase
Solution Approach 1:
The patent merges the bidirectional DC/DC circuits for the energy storage battery and chargeable vehicle into a single shared circuit. The controller manages this unified circuit to handle both charging and discharging operations, reducing the total number of DC/DC circuits from two to one while maintaining functional independence through controlled operation sequences.
Solution Approach 2:
The single bidirectional DC/DC circuit is designed to serve multiple functions: it can charge the energy storage battery, charge the chargeable vehicle, and handle bidirectional power flow. The controller enables this circuit to adapt its operation mode based on system requirements, making it a universal component that replaces multiple specialized circuits.
2Adaptability or versatility
If separate bidirectional DC/DC circuits are used for energy storage battery and chargeable vehicle, then operational flexibility is improved, but overall system cost increases
Solution Approach 1:
The controller dynamically switches the single bidirectional DC/DC circuit between different operational modes depending on whether the energy storage battery or chargeable vehicle needs charging. This dynamic control allows the circuit to adapt to varying system requirements, maintaining operational flexibility while using a single unified hardware configuration.
Data Source
AI summary
An energy storage system and a control method thereof in the field of energy storage are provided. The system includes: an energy storage battery, a first bidirectional DC/DC circuit, a DC bus, a DC/AC circuit, a first controllable switch, and a second controllable switch. The energy storage battery is connected to a device side of the first bidirectional DC/DC circuit via the first controllable switch; a bus side of the first bidirectional DC/DC circuit is connected to the DC bus; the DC bus is connected to a public power grid via the DC/AC circuit; the second controllable switch has a first end connected to a chargeable vehicle, and a second end connected to the device side of the first bidirectional DC/DC circuit; and at most one of the first controllable switch and the second controllable switch is in a closed state at the same time.