Battery Unit Selection for Stable DC Link Voltage Control
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Solution Overview
Problem
Conventional power conditioner systems face difficulties in stabilizing the voltage of a DC link due to challenges in controlling the voltage when receiving power restriction instructions or experiencing abrupt load fluctuations, especially when using multiple battery units with varying voltage measurements and potential measurement errors.
Innovation Solution
A method for controlling the charge/discharge of multiple battery units in a power conditioner system, where a selected first battery unit stabilizes the DC link voltage, and other units manage charge/discharge power, using parameters like power capacity and state of charge (SOC) to optimize power allocation and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the inverter controls the voltage of the DC link to stabilize it, then the voltage stability is improved, but the control becomes difficult when receiving power restriction instructions or experiencing abrupt load fluctuations
Solution Approach 1:
The patent divides the voltage control function from the power management function by selecting specific battery units to perform voltage control while others handle power management. This segmentation allows the system to maintain voltage stability through dedicated units while improving overall adaptability to different operating conditions.
Solution Approach 2:
The patent implements dynamic selection of battery units for voltage control based on real-time operating conditions such as power restriction instructions and load fluctuations. The controller dynamically adjusts which battery unit performs voltage control, enabling the system to adapt to changing conditions while maintaining stability.
2Power
If multiple battery units are used in the storage system, then the power capacity is increased, but the voltage measurement variations and control complexity increase
Solution Approach 1:
The patent segments the functions of multiple battery units by designating specific units for voltage control while assigning other units to power management tasks. This functional segmentation reduces control complexity by clearly defining the role of each battery unit, even as the system scales to accommodate more units for increased power capacity.
Solution Approach 2:
The patent creates a hybrid control scheme where battery units can serve multiple purposes - some units perform both voltage control and power management, while others focus on power management. This multi-functionality allows the system to leverage multiple battery units for increased power capacity without proportionally increasing control complexity.
Data Source
AI summary
In a power conditioner system including a storage system having a plurality of battery units, the battery units of the storage system are each connected to an inverter through a DC link. A battery unit executing charge/discharge operation for controlling the voltage of the DC link is selected among the battery units.