Common DC bus based multi-frequency converter system for vessel

A common DC bus, frequency conversion system technology, applied in general control systems, control systems, control/regulation systems, etc., can solve the problem of not fully exploiting the technical potential of frequency converters, and achieve the effect of reducing electric energy and system heat generation.

Inactive Publication Date: 2008-03-12
CHINA CNR LIMITED DALIAN ELECTRIC TRACTION R&D CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this configuration method is technically simple, it does not give full play to the technical potential of frequency converters when they are used in groups, and there is still a lot of room for improvement in terms of its economical and performance advantages.

Method used

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  • Common DC bus based multi-frequency converter system for vessel
  • Common DC bus based multi-frequency converter system for vessel
  • Common DC bus based multi-frequency converter system for vessel

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Embodiment Construction

[0051] A multi-inverter system based on a common DC bus as shown in Figures 1-5 is characterized in that multiple inverters are connected to the common DC bus and connected to the main three-phase power supply in the ship through a common rectification device . The public rectifying device 2 completes the conversion from the main three-phase power supply to the public DC power supply; the public DC bus bar 3 provides DC power supply to each frequency converter 6 ; and each frequency converter drives its corresponding asynchronous motor 7 . The system also includes an input filter device 1 , a common overvoltage chopper unit 4 , a system insulation detection device 5 and a master control unit 8 .

[0052]The internal circuit of the input filter device 1 included in the present invention is shown in FIG. 2 . It is mainly composed of a set of three-phase filter reactors, three matched sets of capacitors, and a three-phase electromagnetic compatibility filter. According to the r...

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Abstract

The invention discloses a heterodyne-converter system based on public DC bus technology for boat and is characterized in that: a plurality of frequency changers are connected with respective public DC bus and is connected with the main three phase power source inside the boat through a public ratifying device. The public rectifying device finishes the transforming from the main three phase power source to public DC power source and provides DC power for each frequency changer through the public DC bus, each frequency changer drives respective non-synchronous motor. The heterodyne-converter system for boat needs only a group of public input wave filter device, a group of public three phase rectifying device, a group of public overpressure chopped wave unit and a group of public insulating inspection device to supply reliable work insurance for the posterior pole system made of heterodyneconverter system. The invention greatly increases the work reliability of the whole system and is mainly applied in the DC drive frequency changing system of boat for heterodyne-converter drive of the windlass load, blower load and pump load.

Description

technical field [0001] The invention relates to a frequency conversion system applied to an AC drive of a ship to provide a public DC power supply for a system composed of a plurality of frequency converters. It can be widely used in the field of ships, and is especially suitable for the field of engineering ships with multiple driving units. Background technique [0002] At present, hydraulic transmission systems or pole-changing motor transmissions are widely used in the drive field of ships, which have many shortcomings such as complex systems, low efficiency, and heavy maintenance tasks, and are gradually being replaced by advanced AC drive systems using frequency converters. The frequency converter AC drive system can overcome the above-mentioned shortcomings of the traditional drive system, and has the characteristics of high starting torque, wide stepless speed regulation range and full use of electric braking, which represents the technical development direction of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06H02J3/00G05B19/418G05B15/02
Inventor 车向中谢步明郭建斌姜悦礼蔡景荣马晨普
Owner CHINA CNR LIMITED DALIAN ELECTRIC TRACTION R&D CENT
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