Power Storage Current Sensor Correction During Energy Management
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Solution Overview
Problem
In stationary power storage systems, the power storage devices must remain in a conduction state for energy management, but current sensors' output correction is insufficient due to the interruption state, leading to decreased accuracy in current control.
Innovation Solution
A control device is used to select power storage devices for energy management, interrupt non-selected devices, and acquire output values from current sensors when no current flows to perform accurate output correction and maintain high energy management accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power storage devices are kept in conduction state for energy management, then energy management can be performed continuously, but current sensor output correction becomes insufficient and current control accuracy decreases
Solution Approach 1:
The control device performs output correction of current sensors during periods when power storage devices are not needed for energy management. By preparing the correction in advance during idle periods, the system ensures accurate current control when energy management begins, without interrupting the continuity of energy management operations.
Solution Approach 2:
The system alternates between energy management mode and sensor correction mode in periodic cycles. During designated correction periods, power storage devices are switched to interruption state to enable accurate current sensor calibration, while during energy management periods, devices operate in conduction state. This periodic switching ensures both continuous energy management capability and regular sensor accuracy maintenance.
2Measurement precision
If current sensor output correction is performed frequently, then current control accuracy is improved, but energy management continuity is interrupted
Solution Approach 1:
Instead of performing full correction cycles frequently, the system performs partial correction actions during brief idle moments within the energy management period. By applying incremental correction updates rather than complete correction cycles, the system maintains current control accuracy without significantly interrupting energy management operations.
Data Source
AI summary
A stationary power storage system includes a control device configured to control a current value of each of a plurality of power storage devices. Each of the plurality of power storage devices is configured to be switchable between conduction and interruption in accordance with a command from the control device. The control device is configured to select at least one power storage device to be used for energy management from the plurality of power storage devices and interrupt a current of at least one power storage device that has not been selected. The control device is configured to, for the energy management, control a current value of the power storage device that has been selected, and during execution of the energy management, acquire an output value, when no current flows, of at least one current sensor corresponding to at least one power storage device that has not been selected.