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An AC-DC hybrid power distribution system and its fault operation method

An AC-DC hybrid and power distribution system technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problem of low power flow transfer capability, inability to non-faulty AC feeder power supply, and inability to guarantee non-faulty AC-DC hybrid distribution systems. Problems such as normal transmission lines

Active Publication Date: 2021-05-04
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current AC-DC hybrid power distribution system based on power electronics technology still has the following defects: First, the AC feeders in the AC-DC hybrid power distribution system are mainly connected through contact switches and run radially, causing each AC feeder to correspond to The load power supply circuit in the system is relatively single. When multiple AC feeder failures occur, it cannot be guaranteed that the non-faulty AC feeder in the system can continue to supply power to each AC feeder; second, the AC system and DC system in the AC-DC hybrid power distribution system Generally, the power coupling is performed through a VSC (voltage source converter) converter, resulting in a low power flow transfer capability of the AC-DC hybrid power distribution system. All non-fault transmission lines can supply power normally

Method used

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  • An AC-DC hybrid power distribution system and its fault operation method
  • An AC-DC hybrid power distribution system and its fault operation method
  • An AC-DC hybrid power distribution system and its fault operation method

Examples

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example 1

[0065] Example 1: A fault occurs between circuit breakers C4-C5 in the first AC feeder L3.

[0066] The fault operation method of the AC / DC hybrid power distribution system mainly includes the following steps:

[0067] Step 11: Control circuit breakers C4 and C5 to open.

[0068] Step 12: Obtain the non-faulty line ( image 3 The target power supply node that has a power supply relationship with the line connected to the circuit breaker C5-C6 and C13 is a flexible interconnection device.

[0069] Step 13: Supply power to the non-fault line corresponding to the first AC feeder L3 through the flexible interconnection device, that is, control the voltage and flow of the AC power in the first AC feeder L2, L5-L6 through the flexible interconnection device, so that the first AC feeder The AC power in L2, L5-L6 continues to supply power to the loads in the non-fault line corresponding to the first AC feeder L3.

[0070] In step 13 in this embodiment, when image 3 When the AC-DC...

example 2

[0071] Example 2: A fault occurs between circuit breakers C19-C20 in DC feeder L13.

[0072] The fault operation method of the AC / DC hybrid power distribution system mainly includes the following steps:

[0073] Step 21: Control circuit breakers C19 and C20 to open.

[0074] Step 22: Obtain the non-faulty line ( image 3 The target power supply node of the shown DC feeder L7) having a power supply relationship is the voltage source converter VSC1.

[0075] Step 23: Supply power to the non-fault line corresponding to the DC feeder L13 through the voltage source converter VSC1, that is, continue to supply power to the loads in the DC feeder L7 through the voltage source converter VSC1.

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Abstract

The invention relates to the technical field of power electronics, and specifically provides an AC / DC hybrid power distribution system and a fault operation method thereof, aiming at solving the technical problem of how to improve the power supply reliability of the AC / DC hybrid power distribution. The system provided by the present invention includes an AC distribution sub-system, a DC distribution sub-system, a voltage source converter and a power electronic transformer. The AC distribution sub-system includes a flexible interconnection device and is arranged between the flexible interconnection device and the low-voltage side of the first transformer. When multiple first AC feeders are faulty, the flexible interconnection device can be used to control other non-faulty first AC feeders to the non-faulty feeders corresponding to each faulty feeder after the fault point in the faulty feeder is removed. The line continues to supply power; at the same time, the DC distribution sub-system in the present invention performs power coupling with the AC distribution sub-system through the voltage source converter and the power electronic transformer respectively, which further improves the power supply reliability of the AC-DC hybrid power distribution.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an AC / DC hybrid power distribution system and a fault operation method thereof. Background technique [0002] With the gradual maturity of power electronics technology, the AC-DC hybrid power distribution system based on power electronics technology has also developed rapidly. However, the current AC-DC hybrid power distribution system based on power electronics technology still has the following defects: First, the AC feeders in the AC-DC hybrid power distribution system are mainly connected through contact switches and run radially, causing each AC feeder to correspond to The load power supply circuit in the system is relatively single. When multiple AC feeder failures occur, it cannot be guaranteed that the non-faulty AC feeder in the system can continue to supply power to each AC feeder; second, the AC system and DC system in the AC-DC hybrid power distribution syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J5/00H02J3/00
CPCH02J3/005H02J5/00
Inventor 杨艳红张释中裴玮邓卫叶华
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI