Bidirectional AC/DC Converter Control for Compact High-Power Storage
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Solution Overview
Problem
Existing power control systems face challenges in achieving quick response and large output power while maintaining a manageable system size, particularly when integrating a power converter and large-capacity power storage devices.
Innovation Solution
A power control system incorporating a first energy storage system, a bidirectional AC/DC converter, a circuit breaker, a resistor, and a switch, along with a control device to manage charging and discharging without increasing system size, and an additional configuration with a bidirectional DC/DC converter and parallel circuit for efficient energy transfer between storage systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a system configuration combining a power converter and large-capacity power storage device is used to achieve quick response and large output power, then the response speed and output power are improved, but the system size is increased
Solution Approach 1:
The patent combines the charge device and discharge device into a single integrated power converter unit. The bidirectional AC/DC converter serves both charging and discharging functions, eliminating the need for separate dedicated charge and discharge equipment. This merging of functions reduces the overall system size while maintaining the capability for quick response and large output power.
Solution Approach 2:
The power converter is designed with multi-functionality, serving as both a charge device and a discharge device. The bidirectional converter can operate in both rectification mode (charging) and inversion mode (discharging), allowing a single device to perform multiple functions that would traditionally require separate equipment, thereby reducing system size.
2Adaptability or versatility
If separate charge device and discharge device are provided in a storage system, then the charging and discharging functions are improved, but the system size is increased
Solution Approach 1:
The patent merges the charge device and discharge device into a single bidirectional power converter. This converter can switch between charging mode (converting AC to DC) and discharging mode (converting DC to AC), providing both charging and discharging functions through one integrated unit rather than requiring separate dedicated devices.
Solution Approach 2:
The bidirectional power converter is designed with universal functionality to handle both charging and discharging operations. By implementing multi-functionality in a single device, the system maintains versatile charging and discharging capabilities while avoiding the space occupation of multiple separate devices.
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
Enables efficient charging and discharging of energy storage systems without enlarging the power control system, facilitating quick response and large output power capabilities.
Implementation Method 1
a bidirectional AC/DC converter for converting the DC power of the first energy storage system into AC power and converting AC power of an AC power system into the DC power
Implementation Method 2
a resistor connected between the circuit breaker and the bidirectional AC/DC converter; and a switch for forming a discharge path for discharging the DC power of the first energy storage system via the resistor
Data Source
AI summary
A power control system includes: a first energy storage system; a bidirectional AC/DC converter connected between an AC power system and the first energy storage system; and a control device for controlling an operation of the bidirectional AC/DC converter. The control device controls the operation of the bidirectional AC/DC converter to control charging and discharging of the first energy storage system. The power control system includes: a circuit breaker connected between the AC power system and the bidirectional AC/DC converter; a resistor connected between the circuit breaker and the bidirectional AC/DC converter; and a switch for forming a discharge path for discharging the DC power of the first energy storage system via the resistor, while the circuit breaker is open.