Power Storage Relay Layout for Maintenance Without Control Power Loss
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Solution Overview
Problem
The control unit of a power storage system becomes inoperable when the power storage device is opened for maintenance, as it loses its power source due to the relay disconnecting it from the power storage device, and there is a risk of power outages or insufficient power from alternative sources.
Innovation Solution
A power storage system configuration where the relay is positioned between the power storage device and the electrical load, allowing the control device to disconnect the power storage device from the load while maintaining connectivity to an alternative power source, enabling the control device to remain powered and perform maintenance tasks like cell voltage equalization without losing power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the relay is disconnected to open the power storage device for maintenance, then the power storage device can be maintained (cell voltage equalization), but the control device loses power supply and becomes inoperable
Solution Approach 1:
The relay is segmented into two separate relays: one relay (first relay) controls the connection between the power storage device and the control device, while another relay (second relay) controls the connection between the power storage device and the electrical load. This segmentation allows independent control of power supply to the control device versus power supply to the load, enabling maintenance of the power storage device without disrupting control device operation.
Solution Approach 2:
The control device acts as an intermediary that receives power from the power storage device through the first relay and uses this power to control the second relay, which in turn controls the connection to the electrical load. This intermediary arrangement allows the control device to maintain power supply while managing the disconnection for maintenance purposes.
2Ease of operation
If the relay is disconnected to perform maintenance operations, then maintenance tasks can be executed, but the control device cannot receive power supply and stops operating
Solution Approach 1:
The power supply path is segmented into two independent circuits: one circuit supplies power to the control device through the first relay, while another circuit supplies power to the electrical load through the second relay. This allows the control device to maintain power supply during maintenance operations by keeping the first relay closed while opening the second relay for load disconnection.
3Reliability
If the relay remains connected to maintain control device power supply, then the control device remains operable, but the power storage device cannot be opened for maintenance
Solution Approach 1:
The relay system is segmented into two independent relays: the first relay maintains continuous power supply to the control device, while the second relay enables disconnection of the electrical load for maintenance. This segmentation resolves the contradiction by allowing simultaneous maintenance access and control device operation through independent relay control.
Solution Approach 2:
The system dynamically switches between different relay states based on operational requirements. During normal operation, both relays are closed. During maintenance, the second relay opens while the first relay remains closed, allowing dynamic adaptation of the power supply configuration to meet different operational needs.
Data Source
AI summary
A power storage system includes: a stationary power storage device configured to supply electric power to an electrical load; a control device configured to receive supply of electric power from each of the power storage device and another power source; a relay located between the power storage device and the control device and between the power storage device and the electrical load, but not between the control device and the power source; and an input device configured to accept input from a user. When a connection request is input to the input device while the relay is in a disconnected state, the control device brings the relay into a connected state.