Parallel Power Supply String Control for Accurate State Detection
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Solution Overview
Problem
Existing power supply systems face challenges in accurately monitoring the state of power distribution when current values are low, leading to potential misunderstandings and errors in state detection, particularly when multiple power supply devices are connected in parallel and power demand is small.
Innovation Solution
A power supply system comprising a power distribution device connected to multiple strings in parallel, each string including sweep modules with battery modules and switching elements, and a control device that determines which strings to prioritize for power input or output, ensuring stable current values and accurate state monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple power supply devices are connected in parallel to increase system capacity, then the overall power output capability is improved, but the current value in each individual device decreases leading to measurement errors
Solution Approach 1:
The system segments the power supply operations by dividing strings into monitoring strings and non-monitoring strings. The control device selectively performs monitoring processes only on designated monitoring strings, thereby concentrating sufficient current for accurate measurement while maintaining overall system power capacity through the parallel configuration of all strings.
Solution Approach 2:
The patent applies local quality by assigning different roles to different strings: monitoring strings are optimized for accurate state detection with sufficient current flow, while non-monitoring strings contribute to overall power output without requiring the same measurement precision. This localized differentiation resolves the contradiction between total power capacity and measurement accuracy.
2Loss of information
If a monitoring process is performed on all strings connected in parallel, then comprehensive state information is obtained, but the current value in each string becomes too small causing detection errors
Solution Approach 1:
The monitoring function is segmented to operate selectively on only certain designated strings rather than all strings simultaneously. The control device identifies specific monitoring strings and performs monitoring processes exclusively on those, ensuring sufficient current values for accurate detection while still gathering essential state information needed for system operation.
Solution Approach 2:
Instead of performing monitoring on all strings (excessive action), the system performs monitoring on a partial subset of strings that is sufficient to maintain system reliability. This partial monitoring approach ensures adequate current values for detection accuracy while obtaining the necessary state information to control power input and output operations.
3Stability of the object's composition
If power is distributed evenly across all strings, then system balance is maintained, but the current value in each string decreases leading to misunderstandings of device state
Solution Approach 1:
The system applies local quality by creating different operational characteristics for different strings. Monitoring strings receive prioritized power distribution to ensure sufficient current for reliable state detection, while non-monitoring strings operate with standard distribution. This localized differentiation maintains overall system balance while ensuring detection reliability in critical monitoring strings.
Solution Approach 2:
The control device uses feedback from monitoring strings to adjust power distribution dynamically. By continuously monitoring the state of designated strings and using this information to control overall power input and output, the system maintains both balance and detection reliability. The feedback mechanism allows the system to prioritize current values in monitoring strings when needed.
Data Source
AI summary
A control device of a power supply system includes a first processing unit and a second processing unit. The first processing unit is a processing unit configured to perform a first process of determining certain strings out of a plurality of strings connected in parallel to a power distribution device. The second processing unit is a processing unit configured to perform a second process of performing inputting of electric power to the plurality of strings connected in parallel to the power distribution device or outputting of electric power from the plurality of strings to the power distribution device using at least the certain strings determined by the first processing unit.