The application of high-power bidirectional DC-DC converters in port energy conservation is mainly reflected in the following aspects:
I. Potential Energy Recovery System
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System Background: When lifting equipment used in ports, such as portal cranes and gantry cranes, lowers the spreader, the motor generates electricity under the dragging of the spreader, converting potential energy into electrical energy. The traditional method is to consume this part of the electrical energy through energy-consuming resistors. However, this method is a waste of energy and generates heat.
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Application Method: The high-power bidirectional DC-DC module, with the help of the large-capacity energy storage unit of supercapacitors, has introduced a potential energy recovery and energy-saving system. This system stores electrical energy when the motor generates electricity and releases and utilizes this electrical energy when the motor consumes electricity.
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When the spreader is lowering: The electrical energy is stored in the supercapacitor energy storage unit.
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When the spreader is rising: The stored electrical energy is released into the supercapacitor energy storage unit on the DC bus side of the frequency converter, reducing the electrical energy supplied by the mains power, and achieving the full utilization and recovery of potential energy.
II. Technical Parameters
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DC Voltage: The DC voltage range of the high-voltage side is 550-750Vdc (configurable), and the DC voltage range of the low-voltage side is 200-540Vdc (configurable).
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DC Current: The rated DC current at both the low-voltage end and the high-voltage end is 1000A.
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Power Flow: Bidirectional, and it can charge and discharge the supercapacitors at different times.
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Rated Power: The output power (when the output voltage is 500V) is rated at 500KW, and the maximum power is 550KW.
III. Protection System
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High-voltage End Protection: It includes high-voltage overvoltage and high-voltage undervoltage protection to ensure the stability of the bus voltage of the frequency converter.
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Supercapacitor Module Protection: It provides overheating and overvoltage protection for each module unit.
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DC/DC Protection: It provides overcurrent and overheating protection.
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Supercapacitor End Protection: It includes overvoltage, undervoltage, and voltage equalization protection for the combination of supercapacitor modules.
IV. Application Case
A certain port in China has adopted high-power bidirectional DC-DC modules and carried out the design of kinetic energy and potential energy recovery for a 25-ton portal crane. This application not only realizes the recovery and utilization of energy but also helps the port to save energy, reduce emissions, and lower operating costs.
V. Conclusion
The application of high-power bidirectional DC-DC converters in port energy conservation realizes the circular utilization of electrical energy through the potential energy recovery system, improving the energy utilization efficiency of the port. At the same time, through the precise electrical protection system, the safe and stable operation of the equipment is ensured. With the continuous development of technology and the reduction of costs, this energy-saving application is expected to be promoted and applied in more ports.
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