PV-Coupled Battery Rack Control With Distributed DC/DC Converters
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Solution Overview
Problem
Existing DC-coupled energy storage systems face challenges in controlling individual battery racks and require appropriate control methods when integrated with photovoltaic systems, as they lack the ability to manage power conversion efficiently and individually control battery components.
Innovation Solution
The system includes a power management controller that determines operating modes and output references for a power conversion system and DC/DC converters based on the state of the photovoltaic system, using MPPT and droop modes to optimize power management, and a battery section controller to manage individual battery racks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large-capacity central power converter (DC/DC converter) is applied in a DC-coupled system, then power conversion capability is improved, but individual control of battery racks becomes impossible
Solution Approach 1:
The patent divides the single central power converter into multiple distributed power converters, each associated with individual battery racks. This segmentation enables both adequate power conversion capability and individual control of each battery rack, as each converter can be independently controlled while collectively meeting the system's power requirements.
2Measurement precision
If a power management system monitors state of each component in a DC-coupled system, then system monitoring capability is improved, but appropriate control method for photovoltaic integration is lacking
Solution Approach 1:
The patent implements dynamic control strategies that adapt to different operating conditions of the photovoltaic system. The power management system dynamically adjusts control parameters and modes based on real-time monitoring of photovoltaic output, battery states, and grid conditions, enabling appropriate control methods for photovoltaic integration while maintaining precise system monitoring.
3Loss of energy
If DC-coupled system architecture is used with photovoltaic system, then system efficiency is improved, but control complexity increases
Solution Approach 1:
The patent enables the DC-coupled system to self-regulate through coordinated control of distributed power converters that automatically adjust their operation based on local measurements and system-wide communication. This self-service capability maintains high efficiency while reducing external control complexity, as the system components autonomously manage power flow based on real-time conditions.
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 approach allows for efficient control and operation of individual battery racks in the energy storage system, enhancing system efficiency and flexibility in response to photovoltaic system conditions.
Implementation Method 1
An energy storage system connected with a PV (Photovoltaic) system
Implementation Method 2
a plurality of DC/DC converters configured to control a plurality of battery racks
Implementation Method 3
a plurality of battery racks
Data Source
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AI summary
An energy storage system, connected with a photovoltaic system and a power grid, may comprise: a plurality of DC/DC converters configured to control a plurality of battery racks; a power conversion system configured to control power in connection with the plurality of DC/DC converters and the photovoltaic system; and a power management controller configured to determine operating modes and output references of the power conversion system and the plurality of DC/DC converters according to a state of the photovoltaic system.