Port electromagnetic crane and regenerative energy recovery and recycling method and application

By monitoring the voltage changes of the variable frequency motor and controlling the energy manager, the problem of regenerative energy recovery and recycling of the port crane is solved, the stable recovery and recycling of regenerative energy is achieved, and the safety and efficiency of the system are improved.

CN119143012BActive Publication Date: 2025-09-30WUXI XIEXING PORT MACHINERY
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Patent Information

Application Number
CN202411631966.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-15
Publication Date
2025-09-30
Estimated Expiration
2044-11-15

AI Technical Summary

Technical Problem

In the existing technology, the regenerative energy generated by the hoisting motor of the port crane during braking and lowering cannot be effectively recovered and recycled, resulting in problems such as power grid impact, harmonic pollution and insufficient energy utilization.

Method used

By monitoring the changes in the common DC bus voltage between the variable frequency motor and the inverter, the motor status can be judged in real time, and the energy manager can be used to control the charging and discharging status of the energy storage unit to achieve the recovery and recycling of regenerative energy and avoid impact and pollution to the power grid.

Benefits of technology

It achieves stable recovery and recycling of renewable energy, reduces grid impact and harmonic pollution, and improves crane operating efficiency and system safety.

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Abstract

The present invention discloses a port electromagnetic crane and a method and application for recycling and utilizing regenerative energy. This solution cleverly monitors the voltage changes of the common DC bus between the variable frequency motor and the frequency converter to determine in real time whether the variable frequency motor is in the electric state or the power generation state. At the same time, this solution also monitors the state of the energy storage unit and uses the energy storage unit to charge and discharge the auxiliary motor to avoid its negative impact on the system circuit. This solution switches the working state of the energy storage unit to different states through the energy manager based on the motor state information and the energy storage state information of the energy storage unit. This solution can be applied to the working control method of the port electromagnetic crane to realize energy recovery and reuse when the crane's lifting motor is working. At the same time, because the regenerative energy generated by the lifting motor is not fed back to the power grid, it will not cause impact on the power grid and will not cause pollution problems such as harmonics and flicker to the power grid.
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