INVT Energy-Saving Solution for Variable Speed Diesel RTG Cranes

1. Introduction of tire crane

Tire type container gantry crane is a special machine for stacking operation of container cargo. Tire type container gantry crane consists of main sorghum, 4 gate legs, running trolley, hoisting mechanism, trolley running mechanism, electrical system, operation cab and so on.  

2. Project difficulties

Full variable speed diesel engine to the whole machine power supply the following main problems:
1, how to make the variable speed diesel engine brings the variable frequency variable voltage power supply into a constant power supply;
2, how to ensure the stability of the electrical equipment in the electrical room when the diesel engine speed change;
3, lifting frequency converter power distribution balance;
4, How to ensure the accuracy of torque in the electric anti-shaking mode.

3. INVT Solution

According to the characteristics of the equipment, INVT designates the technical solution mainly adopts AFE rectification to change the power supply of frequency conversion into stable DC power supply; at the same time, it utilizes CVCF to supply power to the whole machine of RTG when it starts the diesel engine, and after the AFE is running, the AC inlet of CVCF is switched to the DC power supply seamlessly to ensure the stability of the control power supply of the whole machine; and the anti-shaking VFD provides the stable torque output by adopting the closed-loop vector, which can achieve the torque fluctuation error of more than 3%. The torque fluctuation error of no more than 3% can be realized.

Program System Diagram

4. Customer Benefits

* High product reliability and good user experience
Selection of the third generation of port-specific GD350-19-PT series VFD, the selection of port series inherited from the big brands of low failure rate device brand; standard thickening of the three-proof paint treatment in the port of the high salt spray environment can be better resistance to salt spray corrosion; the entire life of the machine is higher and more reliable.

* Perfect equipment protection and safer machinery

GD350-19 series VFD has a master-slave application function, which can better protect the mechanical parts and reduce the shock when the dual hoist motors are rigidly connected, and the unbalance is less than 5%.。
Expanded functionality for better understanding of device status
Users can observe the operation status of VFD in real time through the Ethernet card, so as to understand the operation status of the whole system and make the maintenance of the equipment more convenient.

* Excellent energy saving and emission reduction 
By running the diesel engine at reduced speeds during light loads and transitions, the amount of diesel fuel used can be effectively reduced, thus reducing carbon dioxide and sulfide emissions, which is kinder to the environment and less expensive to operate.

5. Programmatic summary

Application of variable speed diesel engine makes INVT's energy saving and emission reduction solutions on RTG more abundant, and broadens the scope of INVT's products in different terminal working conditions. INVT's solutions on RTG include: fixed-speed diesel RTG solution, lithium-ion hybrid RTG solution, utility + diesel RTG solution, utility + PCS RTG solution, lithium-ion battery RTG solution, and so on. Various energy-saving and emission reduction solutions to meet the carbon emission and energy-saving needs under various working conditions and applications in terminals