industry characteristics

Shore power supply, also known as shore-use variable frequency power supply or electronic static shore power supply, is a high-quality power supply that converts three-phase 50Hz industrial electricity into three-phase 60Hz electricity with stable frequency and voltage. It is used in places where three-phase 60Hz power is required, such as ships, shipbuilding and repairing factories, offshore drilling platforms, and shore terminals, to supply power to shipboard electrical equipment. The shore power supply is specifically designed for harsh operating environments such as ships and shore terminals, which are characterized by high temperature, high humidity, high corrosivity, and large load impact. All PCB circuit boards undergo coating curing treatment; sine filters and output transformers are treated with overall vacuum impregnation insulation paint and sprayed with high-temperature protective paint, providing high insulation levels and protective capabilities; they comply with the China Classification Society (CCS) marine product certification standards. Commonly used shore power supplies include 500KVA shore power supply, 800KVA shore power supply, and 1000KVA variable frequency power supply.
       

Since the standard power supply frequency of China's power grid is 50 Hz, before the onboard generator is put into normal use, these devices that require 60 Hz power supply cannot work properly when connected to China's power grid. The traditional power supply method in the shipbuilding and repair industry in the past was to use a three-phase 380V/50Hz motor (synchronous or asynchronous) to drive a 440V/60Hz generator to supply power to the ship. This method had many disadvantages, such as high noise, low efficiency, high failure rate, inconvenient maintenance, requiring special personnel for management, poor dynamic characteristics of output voltage under sudden heavy load, unstable frequency, and so on. As a professional power supply equipment for the shipbuilding and repair industry, the marine static shore power supply emerged as the times require, because it has the function of converting 50Hz to 60Hz power supply, has a higher cost-effectiveness, and can provide shore power to ships of different systems.
       

Compared to generators, it saves over 20% of energy and eliminates many inconveniences brought by generators, such as loud noise, high operating costs, significant losses, pollution, difficult maintenance, and the need for dedicated management. Functionally, it has stronger applicability, can monitor the operation of the power supply in real time, and is widely used by major domestic shipbuilding and ship repair enterprises..
1. Compared to the high loss of the generator set, its no-load loss is small, allowing it to operate with low or high load for a long time;
2. Compared to generator sets, it significantly saves operating costs and offers a quick return on investment;
3. It is easy to operate and manage, eliminating the need for dedicated personnel, thus significantly reducing management costs;
4. It operates with low noise, produces no pollution, and has minimal impact on the environment;
5. The outdoor square warehouse, featuring rainproof, frost-resistant, dustproof, and acid mist-resistant properties, is easy to move and simple to install;
6. Under normal operating conditions, key core components can operate without failure for an extended period of time;
7. Good dynamic characteristics, high frequency stability, and strong shock resistance.
       

The shore power supply has higher standards than ordinary variable frequency power supplies. The core inverter module group is mainly composed of interconnected components such as IGBTs (Insulated Gate Bipolar Transistors), switching power supplies, heat sinks, electrolytic capacitors, snubber capacitors, drive boards, and copper plates. This module group adopts IGBT inverter technology, featuring high reliability, small size, significant material savings in manufacturing, light weight, and easy mobility. It automatically matches optimal technical parameters, reducing wiring inductance. This enhances the reliability of the system, and also makes the capacitor distribution more uniform, with a more compact, simple, and aesthetically pleasing structure.