Multi-infeed direct current commutation failure quick assessment method

A multi-infeed DC and commutation failure technology, which is applied to AC network circuits, power transmission AC networks, instruments, etc., can solve problems such as the inability to fully measure the impact of faults, achieve rapid scanning, and avoid misjudgment effects

Active Publication Date: 2017-11-24
NARI TECH CO LTD +3
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AI Technical Summary

Problems solved by technology

Only considering the multi-infeed interaction factors or the operating status of a DC itself cannot fully measure the impact of AC system faults on multiple DC faults

Method used

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  • Multi-infeed direct current commutation failure quick assessment method
  • Multi-infeed direct current commutation failure quick assessment method
  • Multi-infeed direct current commutation failure quick assessment method

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Embodiment 1

[0042] The method in this embodiment is used to evaluate the commutation failure of multi-infeed DC, and its process is as follows figure 1 As shown, it mainly includes the following steps:

[0043] 1) Calculate the multi-feed interaction factor M of any two direct currents i and j in the n-return direct current feed-in system IIFji And the multi-infeed effective short-circuit ratio M of each return DC scr , where, i=1, 2,..., n, j=1, 2,..., n, i≠j;

[0044] 2) Let the bus at the fault point be F, and calculate the self-impedance Z of the bus F FF And the mutual impedance between the bus F and the commutation bus of each DC inverter station;

[0045] 3) Denote the initial voltage of bus F as U F0 , use the formula (1) to estimate the transient voltage drop of the n-circuit DC inverter station commutation busbar when the three-phase metallic short circuit occurs on the busbar F:

[0046]

[0047] In the formula, M is an n×n full-rank matrix, and its n diagonal elements ar...

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Abstract

The invention discloses a multi-infeed direct current commutation failure quick assessment method, and belongs to the technical field of power system automation. The multi-infeed direct current commutation failure quick assessment method comprehensively considers the interaction influence among multiple loops of direct current, the self operating state and the structure parameter of the direct current, and the capability of the alternating current power grid of supporting a direct current inversion station commutation bus, based on the flow result in the initial operating mode and the structure parameter of the multi-infeed direct current power grid, and can realize quick assessment of the multiple loops of direct current commutation failure risk which may be caused by the three-phase short circuit fault of a multi direct current infeed alternating current power grid on the premise of carrying out no transient stable time domain simulation. The multi-infeed direct current commutation failure quick assessment method can effectively avoid misjudgment caused by depending on voltage drop of the direct current inversion station commutation bus.

Description

technical field [0001] The invention belongs to the technical field of power system automation, and more precisely, the invention relates to a method for quickly evaluating commutation failure of multi-infeed direct current. Background technique [0002] With the rapid development of my country's UHV AC-DC power grid, large-scale DC-intensive access, the problem of AC-DC interaction is prominent, especially the multi-DC feeding into the receiving end system, the problem of multi-DC commutation failure caused by the AC system has become a constraint The key factor for the safe and stable operation of the power grid. [0003] Both the State Grid and the China Southern Power Grid have large-scale multi-infeed DC transmission systems. Taking the East China Branch of the State Grid as an example, by the end of 2017, 10 circuits of high-voltage DC or UHV DC will be connected, with a total feed-in capacity of 57,760MW. Due to the short electrical distance on the DC inverter side, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38G06Q10/06G06Q50/06
CPCG06Q10/0635G06Q50/06H02J3/36H02J3/381H02J2203/20Y02E60/60
Inventor 侯玉强王玉刘福锁李威薛峰罗剑波李兆伟张红丽黄志龙曹路李建华李海峰庄侃沁张倩赵彥丽陈珏
Owner NARI TECH CO LTD
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