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Alternating-direct current mixed electric power system and direct current side fault protection method

An AC-DC hybrid power system technology, applied in emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, single AC networks with different frequencies, etc., can solve the difficulty of DC ground fault isolation, etc. To achieve the effect of suppressing ferromagnetic resonance overvoltage, reducing accident trip rate, reducing personal casualties and equipment damage

Active Publication Date: 2018-01-09
STATE GRID BEIJING ELECTRIC POWER +1
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a DC ground fault protection method for an AC-DC hybrid power system, which solves the DC ground fault isolation when the AC / DC converter device is directly connected to the AC system grounded by the arc suppression device without connecting the transformer problem

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  • Alternating-direct current mixed electric power system and direct current side fault protection method

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Embodiment Construction

[0024] 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.

[0025] figure 1 A schematic diagram of an embodiment of an AC / DC hybrid power system of the present invention is given. The AC-DC hybrid power system includes a 10kV AC power supply (01), an AC busbar (02), a 10kV AC feeder line (03), an AC switch (04), an AC / DC converter (05), an arc suppression device (06), The fault current damping device (07) and the grounding current measuring device (08), the DC side positive busbar (101) voltage measuring device (51) is installed on the DC side positive busbar of the AC / DC converter device (05), and the DC side of the converter is measured. side positive bus bar to ground voltage UdcP; configure DC side negative bus bar (102) v...

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Abstract

The invention discloses an alternating-direct current mixed electric power system and a direct current side fault protection method. 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). By detecting the direct current voltage and the grounding current of the system, whether a direct current side grounding fault occurs in the alternating-direct current mixed electric power system is judged and determined; after the occurrence of the direct current grounding fault, the bilateral switch of the fault current damping device is disconnected; when the directcurrent grounding fault does not occur, the damping resistor is bypassed through the bilateral switch, so the arc distinguishing device is capable of compensating the grounding fault of the alternating current system; the fault current damping device will not affect the protection mechanism during the fault of the alternating current system; and reliability of operation of the system is improved.

Description

technical field [0001] The invention relates to a DC-side grounding fault protection method of an AC-DC hybrid power system, and 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 ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/08H02J3/02
CPCH02H9/08
Inventor 尹昌新李蕴黄仁乐姜田贵谢晔源王存平张禄杨楠朱铭炼连建阳刘洪德张中锋
Owner STATE GRID BEIJING ELECTRIC POWER
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