When selecting the main diesel engine, the ship should consider the sea conditions, ship conditions, diesel engine safety and other power storage. The main diesel engine is mostly operated at partial load, and its economy will be reduced when operating at low loads below 75%-85% of the rated power. If the shaft generator is used, it can make the main engine run under high load for a long time, and then it has good economy. The shaft generator and INVT GD300-EP series special machine inverter can overcome the change of voltage and frequency caused by the unstable spindle speed, and complete the constant frequency and constant voltage output of the power supply. Power supplies can be used for lighting, air conditioning and other mechanical and electrical equipment on ships.
The working principle of the constant frequency constant voltage cabinet system of marine shaft power generation equipment is that the main shaft of the ship engine drives the generator set, and the generator outputs the power supply to the constant frequency and constant voltage system cabinet. This is a new plan of the constant frequency and constant voltage system in the field of marine power supply, which not only has the energy-saving effect of the shaft generator, but also has a stable voltage output to complete the uninterrupted power supply to the electrical equipment on the ship.
A science and technology company in Nanchang City, Jiangxi Province originally needed to configure a diesel generator that needs to be open all the time for the ship's electrical equipment, but with the equipment launched by INVT, as long as the ship is sailing, there is no need for a separate diesel generator to generate electricity, and the electricity can be taken directly from the system, so that fuel can be saved.
According to the needs of customers, INVT launched the plan to increase INVT's GD300-EP series special inverter in the shaft generator, which can make the electricity emitted by the generator need to be rectified and inverted through the GD300-EP series special inverter to stabilize the output voltage and frequency at 380V and 50HZ, overcome the change of voltage and frequency caused by the unstable spindle speed, and complete the constant frequency and constant voltage output of the power supply.
Main control machine: INVT special aircraft inverter GD300-EP
Cooperation system: INVT VS-070HS touch screen, friendly PLC, communication module, communication board, power collection module and other auxiliary materials circuit breaker, relay, etc.
After the special constant frequency and constant voltage conditioning function of INVT special inverter GD300-EP, the PLC of the friend company is used as a help to write the parameters, so that the output voltage and frequency of the inverter are at a stable value.
After the on-site data indicates that the output voltage is stable after the constant frequency and constant voltage cabinet system plan of INVT marine shaft power generation equipment, the output voltage is stable: the communication voltage error can be controlled within 1V during operation; Stable frequency: the frequency error can be controlled within 0.3HZ, and energy saving: taking a 7000-ton cargo ship as an example, 24-hour operation can save 2000 yuan in diesel costs.
The use of INVT GD300-EP inverter can well meet the working needs of shaft generators, whether it is in the stability of power supply voltage and frequency or in the protection of external equipment. The use of this system can make full use of the power of the main diesel engine on board, use the excess energy to provide power to the equipment on board, slow down the use of other standby generators, achieve the effect of energy saving and emission reduction, and bring great economic benefits to users.
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