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An AC-DC hybrid power system and DC 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 personal casualties and equipment damage, and reducing accident trip rate

Active Publication Date: 2019-06-21
STATE GRID BEIJING ELECTRIC POWER +1
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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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  • An AC-DC hybrid power system and DC side fault protection method
  • An AC-DC hybrid power system and DC side fault protection method
  • An AC-DC hybrid power system and DC 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

An AC / DC hybrid power system and a DC-side fault protection method. The system comprises an AC power supply (01), an AC bus (02), an AC feed line (03), an AC switch (04), an AC / DC conversion device (05), an arc extinguishing device (06), a fault current damping device (07), a voltage measurement device (51) for a DC positive bus (101), a voltage measurement device (52) for a DC negative bus (102), and a ground current measurement device (08). Whether a DC-side ground fault has occurred in the AC / DC hybrid power system is determined by means of detecting magnitudes of a DC voltage and a ground current of the system. When there is no DC ground fault, a damping resistor is bypassed by using a bi-directional switch. The arc extinguishing device compensates for ground faults of the AC system, such that a protection mechanism is unaffected by the fault current damping device when a fault occurs in the AC system, enhancing the operation reliability of the system.

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 Patents(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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