As China's economy continues to develop rapidly, the pace of port construction continues to accelerate, the number and density of ships docking at the terminal have increased significantly, most ships, especially oil tankers and container ships, use fuel oil to generate electricity to meet the power demand of ships when they call at the port, for which a lot of fuel needs to be consumed, resulting in a lot of exhaust gas and particulate matter emissions, resulting in severe environmental pollution, thus, shore power supply came into being.
INVT solution
(1) Output closed-loop control
The system has AVR (Active Voltage Regulation) function, which increases feedforward compensation for the use of impact loads, with fast response speed and high precision, and can still ensure stable output when the bus voltage fluctuates frequently or the load often changes suddenly. Through the software algorithm, the reverse power is pressed, and there is no need to configure braking resistance or energy feedback device, and the architecture is simple and the cost is low.
(2) Accurate grid-connected control
The control system uses the self-developed "frequency-locked phase-locked" control technology, which can actively identify the current input voltage system of the ship, with high frequency and phase synchronization accuracy, and has been widely used in the occasion of large-capacity motor frequency conversion and soft start, which can completely realize the shock-free switching between the shore-based power supply and the auxiliary power supply of the ship itself, so as to avoid the impact on other electrical equipment of the system.
Customer value
(1) There are no harmonics in the input and output
(1) The input harmonic is small, and the current harmonic on the grid side is <2% when the rated load is loaded.
(2) The output voltage waveform is pure, close to the sine wave, and the harmonic content is <2%.
(2) High efficiency and high power factor
(1) When the system is fully loaded, the power factor ≥ 0.97.
(2) When the system is fully loaded, the system efficiency ≥ 96%.
(3) Good frequency adaptability
With the function of converting 50Hz to 60Hz power supply, it can provide shore power to ships of different standards, which is more cost-effective.
(4) Energy saving, consumption reduction and environmental friendliness
Compared with the generator, the energy saving is more than 20%, and it saves many inconveniences such as loud noise, high operating cost, large loss, pollution, difficult repair, and the need for special personnel to handle the generator.
(v) High reliability
In terms of function, it has the advantages of being able to monitor the operation status of the power supply in real time. In terms of reliability and volume, the shore power supply has a higher specification than the ordinary inverter power supply, and the module group uses IGBT inverter technology, which has high reliability, small size, greatly saving manufacturing materials, light weight and easy to move. The structure is more compact, concise and beautiful.
INVT GD5000 series high-voltage shore power supply adopts direct high output plan, high system efficiency, small input harmonics and high power factor; The output voltage waveform is of good quality and has strong ability to resist load disturbance; Advanced reverse power pressing technology can achieve reverse power pressing without increasing hardware investment; It is a high-quality choice for shore power systems in ports and terminals.
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