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Connection map-based connection fault identification method of high-voltage DC-AC field equipment

A technology for communicating faults and identifying methods, applied to electrical components, emergency protection circuit devices, etc., can solve problems such as elevation, loss of electrical connection, failure to reach, etc., and achieve the effect of avoiding damage

Active Publication Date: 2018-10-16
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The AC filter split bus operation fault refers to the connection fault between the AC filter and the conventional DC unit. If the electrical connection is lost, if the filter needs to be switched at this time, it will actually have no effect on controlling the reactive power of the conventional DC unit. Instead, it will raise or lower the AC voltage of the bus connected to the filter. There are great risks to the safe operation of equipment and DC systems
The last circuit breaker / last line tripping fault is the connection fault between the conventional / flexible DC unit and the AC feeder. When a certain circuit breaker trips and the DC unit has no electrical connection with all AC feeders, the DC unit may experience serious overvoltage, which affects the primary safe operation of equipment

Method used

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  • Connection map-based connection fault identification method of high-voltage DC-AC field equipment
  • Connection map-based connection fault identification method of high-voltage DC-AC field equipment

Examples

Experimental program
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Embodiment

[0019] like figure 1 and figure 2 As shown, a method for identifying connection faults of high-voltage DC AC field equipment based on the connection graph includes the following steps:

[0020] 1) Construct a complete AC field connectivity graph G=(V,E) according to the topological structure of the AC field, where V={v 1 ,v 2 ,v 3 ,…} is the set of electrical nodes in the AC field, E={e 1 ,e 2 ,e 3 ,…} is the set of electrical branches in the AC field, and its simplified model is as follows figure 1 shown. Each electrical branch circuit contains 1 circuit breaker, 2 isolating switches and 2 grounding switches, if and only if the circuit breaker of the branch circuit and the isolating switches on both sides are in the closed position, and the grounding switches on both sides are in the off position. In this case, the branch is the valid branch. Since the AC field of the converter station is usually three-half wiring, by figure 1 It can be seen that the connected grap...

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Abstract

The invention discloses a connection map-based connection fault identification method of high-voltage DC-AC field equipment. The connection map-based connection fault identification method comprises the steps of building a complete AC field connection map, correcting an AC field connection sub-map at an initial moment T, correcting an AC field connection sub-map at a subsequent moment, judging a fault condition, and taking control protection measure. According to the method, an equipment connection fault of three second wiring AC field is judged by a connection map algorithm, effective and accurate identification on an AC filter spit bus running fault and a final circuit / final circuit breaker trip fault can be simultaneously performed from a fault principle, corresponding control protection measure is conveniently and timely taken, further damage to primary equipment of a DC system is prevented, and the safety of power grid equipment is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power system control operation and protection, in particular to a method for judging connection faults of DC system AC field equipment under the condition of parallel operation of multiple high-voltage direct current transmission units. Background technique [0002] In HVDC transmission projects, the role of the AC field in the converter station is mainly to complete the electrical connection of AC filters, reactive power compensation equipment, converter transformers, AC feeders, station transformers and other equipment through switchgear. Conventional converter valves need to consume a large amount of reactive power when they are normally unlocked. At the same time, converter valves are the source of harmonics in the AC-DC system. Harmonic currents will be generated during rectification or inversion, which will affect the normal operation of electrical equipment in the AC-DC system. run. In order to ma...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 杨育丰何竞松黄义隆吴健颖
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID