Energy Storage System With Bidirectional DC-Link Converters
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Solution Overview
Problem
Existing energy storage systems lack the capability for seamless power supply and power exchange with the power system due to their unidirectional design and absence of a power exchanging algorithm, requiring expensive emergency transfer switches and algorithms for diesel generators.
Innovation Solution
An energy storage system with converters and a main controller that manages power between a power system and a DC distribution network, enabling constant charge/discharge control of batteries and power control based on SOC and consumption information, allowing seamless power supply and exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diesel generator is used for emergency power generation, then seamless power supply is enabled, but expensive emergency transfer switch and algorithm are required
Solution Approach 1:
The patent introduces a converter as an intermediary device between the power system and the battery system. This converter manages power flow and enables seamless power supply without requiring complex emergency transfer switches or algorithms by acting as a mediator that coordinates power transmission and battery charge/discharge operations.
Solution Approach 2:
The patent implements a feedback mechanism where the converter receives SOC (state of charge) information from the battery and consumption power information from loads, then generates power control commands based on this feedback. This closed-loop control enables seamless power supply through intelligent coordination rather than complex hardware switching.
2Device complexity
If the energy storage system is designed with unidirectional power flow, then the system structure is simplified, but power exchanging between the energy storage system and power system is impossible
Solution Approach 1:
The patent transforms the unidirectional power flow design into a dynamic bidirectional system. The converter is designed to adaptively control power flow direction based on real-time conditions, enabling the system to switch between charging and discharging modes while maintaining relatively simple structural components through dynamic operational flexibility.
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 power consumption control and high-quality, seamless power supply by managing battery charge/discharge and power distribution through converters and a communication system, reducing the need for expensive transfer switches and algorithms.
Implementation Method 1
a first converter connected to and disposed between the power system and the DC distribution network, wherein the first converter is configured for converting a alternating current (AC) voltage of the power system into a DC voltage
Implementation Method 2
a battery connected to the second converter, wherein charge and discharge of the battery are controlled by the second converter
Data Source
AI summary
The energy storage system according to one embodiment comprises a first converter connected between the system and the DC distribution network, and converting an AC voltage of the system into a DC voltage and transmitting the DC voltage to the DC distribution network; a second converter connected to the DC distribution network and controlling the voltage of the DC distribution network; a battery connected to the second converter and of which the charging and discharging are controlled by the second converter; a third converter connected to the DC distribution network; and a first load connected to the third converter and of which the voltage is controlled by means of the third converter, wherein the first converter generates a power control instruction for controlling at least one of the battery and the first load on the basis of SOC information of the battery and power consumption information of the first load.