Bidirectional Converter Control for EV Charging Station UPS
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Solution Overview
Problem
The high cost and operational challenges of uninterruptible power supplies (UPS) in electric vehicle charging stations, particularly due to sudden power failures affecting user experience and data loss, necessitate a cost-effective solution for maintaining uninterrupted power supply.
Innovation Solution
A power supply control system utilizing an AC/DC bidirectional converter and energy storage battery, which switches to an inversion state during power outages, ensuring energy supply from the battery while keeping costs low by eliminating the need for separate rectifiers and inverters, and managing voltage and current output based on grid conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate uninterruptible power supply (UPS) is equipped in the charging station, then the reliability of power supply during power failure is improved, but the cost of the charging station increases
Solution Approach 1:
The patent combines the UPS function with the existing energy storage system by integrating a bidirectional converter that can operate in both rectification and inversion modes. This merging eliminates the need for separate UPS equipment while maintaining uninterrupted power supply capability during grid failures.
Solution Approach 2:
The bidirectional converter is designed to perform multiple functions: it acts as a rectifier during normal grid operation to charge the energy storage battery, and switches to inversion mode during power failures to supply power to the load. This multi-functionality replaces what would traditionally require separate dedicated UPS equipment.
2Reliability
If traditional UPS equipment is used, then the uninterrupted power supply function is achieved, but the device complexity and cost increase
Solution Approach 1:
The patent merges the UPS functionality into the existing energy storage system architecture. The bidirectional converter integrates both rectification and inversion capabilities in a single device, eliminating the need for separate UPS equipment and reducing overall system complexity.
Solution Approach 2:
The system dynamically switches between rectification mode during normal operation and inversion mode during power failures. The bidirectional converter can change its operating state in real-time based on grid conditions, providing adaptive power management without requiring complex dedicated UPS hardware.
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
This solution provides uninterrupted power to electric vehicle charging stations without additional UPS costs, ensuring normal operations during power grid failures while maintaining energy storage system readiness and reducing overall expenses.
Implementation Method 1
The energy storage system includes an alternating-current/direct-current (AC/DC) bidirectional converter and an energy storage battery connected to the alternating current bus via the AC/DC bidirectional converter
Implementation Method 2
The inverter is supplied with power via a direct current bus and inverts the power into an alternating current (generally 220 V) required for a load
Implementation Method 3
When the input power supply is normal, the rectifier generates a direct current and outputs the direct current to the energy storage battery and the inverter
Data Source
AI summary
Provided are a power supply control system and a control method thereof. The power supply control system includes: a transformer connected to a power grid; an output socket connected to the transformer via an alternating current bus and configured to be connected to an electric device in the electric vehicle charging station; and an energy storage system including an AC/DC bidirectional converter and an energy storage battery connected to the alternating current bus via the AC/DC bidirectional converter. The energy storage system is configured to be controlled to, in response to the power supply control system being in an uninterruptible power supply mode: switch the AC/DC bidirectional converter into an inversion state; and output no electric energy when the power grid has a normal voltage and supply electric energy only by the energy storage system when the power grid has an abnormal voltage.