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Alternating-direct current mixed electric power system

A technology of AC-DC hybrid and power system, which is applied in the direction of electrical components, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., and can solve the problem of DC grounding faults of converter devices that cannot be isolated, arc suppression coil equipment, etc. Damage, AC switch can not be broken and other problems, to reduce personal casualties, save costs, suppress gap arc overvoltage and ferromagnetic resonance overvoltage effect

Active Publication Date: 2018-01-09
NR ELECTRIC CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the AC system using arc suppression coil grounding, the following problem exists when the converter device and the AC system share the ground, that is, after a ground fault occurs on the DC side of the converter device, the neutral point of the AC system will generate a DC bias voltage. A biased fault current will be generated on the arc suppression coil. Even if the converter device is blocked, the three-phase AC voltage can still be alternately conducted through the freewheeling diode of the converter. When the AC switch cannot be broken, the system cannot isolate the DC ground fault of the converter device
A large fault current will flow through the arc suppression device, commutation device and AC line, which will cause damage to the arc suppression coil, commutation device and other equipment in severe cases.

Method used

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  • Alternating-direct current mixed electric power system
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  • Alternating-direct current mixed electric power system

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.

[0028] figure 1 It is an example of an AC-DC hybrid power system based on the prior art. There is a connection transformer (041) between the AC power supply (01) and the AC / DC converter device (05), and the connection transformer (041) and the AC / DC converter A grounding device (042) is arranged between the converter devices (05) to provide a reference potential for the AC / DC converter device (05). The connection transformer between the AC power source (01) and the AC / DC converter (05) will increase the overall investment and land occupation of the system. figure 2 It is an AC-DC hybrid power system based on the prior art without connecting transformers, and the AC-D...

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Abstract

The invention discloses an alternating-direct current mixed electric power system. The system comprises an alternating current power supply (01), an alternating current bus (02), an alternating current feed line (03), an alternating current switch (04), an AC / DC current conversion device (05), an arc distinguishing device (06), a fault current damping device (07), a direct current positive electrode bus (101), a voltage measurement device (51), a direct current negative electrode bus (102), a voltage measurement device (52) and a grounding current measurement device (08). According to the invention, no transformer is connected between the AC / DC current conversion device (05) and the alternating current power supply (101), so the whole investment and land occupation of the system are reduced.

Description

technical field [0001] The invention relates to an AC-DC hybrid power system, which belongs to the technical field of AC-DC power supply. Background technique [0002] The transmission and distribution technology of the AC grid is mature, and the control and protection mechanism is clear. The DC power grid can realize the flexible control of the transmission power, is suitable for the access of DC power supply and DC load, and can be used as an important supplement to the urban power supply system. Building an AC-DC hybrid power supply system in a specific area can provide higher-quality power supply, better accommodate distributed power sources and DC loads, and improve the power and voltage control capabilities of the AC power distribution system, improve system security and stability, and reduce losses. . [0003] The voltage source converter device can realize AC / DC DC conversion, and its active and reactive power can be independently decoupled and controlled. It is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02H9/08
Inventor 姜田贵谢晔源朱铭炼连建阳段军欧阳有鹏刘洪德殷冠贤张中锋
Owner NR ELECTRIC CO LTD
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