Rubber-tyred gantry crane (RTG) dual power saving system

摘要

The present invention discloses a double-power energy saving system of rubber tyre gantry crane (RTG), which is composed of a controller, a battery pack, a generator set and so on. The system changed the power supply mode of traditional RTG which is powered by a single generator set or a superposition of a generator set and a battery pack. Both the battery pack and the generator set of the system can support the RTG operations independently, forming the double-power energy saving system to improve the equipment reliability The battery pack is used as the primary power source for RTG and the output power can be highly matched with the demanded power, which reduces the reactive loss and increases the energy efficiency. The generator set is shut down and the power is supplied by the battery pack when the electricity of the battery pack is high; the generator set is started to supply power directly for RTG when the electricity of the battery pack is low, and the surplus energy can charge the battery pack. Once the battery pack is put into operation, it will run in the best economical fuel consumption area to achieve the highest fuel efficiency. The feedback energy of RTG can be fully recovered because the charging power of the battery pack is larger than the maximum feedback energy power of RTG. It is not required to replace the original generator set of RTG when the system is applied to RTG transformations.

主权项

1. A double power energy saving system of rubber tyre gantry crane (RTG), which is characterized in it is composed of a system controller, a battery pack and management system, a generator set, a unidirectional DC/AC inverter power, a unidirectional DC/DC direct-current power and an auxiliary transformer. The electric equipment of RTG associated with the system are mainly included a hoisting mechanism transducer, a trolley travelling mechanism transducer, a crane travelling transducer, auxiliary electric equipment and a controlling power supply.
The connection modes and main functions of each power module are as follows: The Battery Pack: it is connected in parallel with the DC bus of the RTG operating mechanism variable frequency drives, which provides motive power for the operating mechanism, and power for the auxiliary power supply and the 24V DC power supply. Besides, when there is inverted energy fed back from the operating mechanism, the inverted energy supplies power for the inverter through DC bus or recovers power to the battery pack. The Inverter: the input terminal is connected in parallel with DC bus, which converts the direct current into alternating current which is then output. The output terminal is connected with the auxiliary transformer 6, and the auxiliary transformer 6 outputsAC380V/220V/50 Hz three-phase four-wire power supply to be used by lights, air-conditioners and other auxiliary electric equipment of RTG. The 24V DC Power Supply: the input terminal is connected with the DC bus, and the output terminal supplies power for the RTG controlling power supply. The Generator Set it is a two-way output, one of which is connected with the AC input terminal of the transducer 7 of the RTG hoisting mechanism, and is connected in parallel with DC bus after rectification, supplying power for the RTG operating mechanism, the inverter and the 24V DC power supply or charging the battery pack; the other of which is connected with the input terminal of the auxiliary transformer, supplying power directly for the auxiliary mechanism when the generator set is put into normal operation. Both the generator set and the battery pack can support the RTG operations independently. The RTG uses the battery pack as the primary power source and the output power can be highly matched with the demanded power. The generator set works intermittently, once put into operation, it is controlled to work in the economical fuel consumption area. The generator set will either work in economical fuel consumption area or is idling or shut down, receiving energy saving and emission reduction while increasing the RTG dynamic reliability.