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Method for analyzing fault of micro electrical network containing V/f control inversion type distributed power source

A fault analysis method and inverter-type distributed technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as not considering the island operation of the microgrid

Active Publication Date: 2014-09-03
SOUTH CHINA UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The existing fault analysis methods focus on the situation of the microgrid when it is connected to the grid, but do not consider the situation of the microgrid when it is operating in an island

Method used

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  • Method for analyzing fault of micro electrical network containing V/f control inversion type distributed power source
  • Method for analyzing fault of micro electrical network containing V/f control inversion type distributed power source
  • Method for analyzing fault of micro electrical network containing V/f control inversion type distributed power source

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Embodiment

[0049] This embodiment takes figure 1 The shown micro-grid is taken as an example, and the micro-grid fault analysis method containing V / f control inverter type distributed power supply of the present invention is used for fault analysis, such as figure 2 shown, including the following steps:

[0050] S1 performs fault judgment and judges the type of fault, if it is a symmetrical fault, execute steps S2-S6, and if it is an asymmetrical fault, execute steps S7-S14;

[0051] S2 obtains the node voltage equation when the fault occurs according to the contour diagram of the distribution network fault:

[0052] [ Y ′ ] U · f = I · f - - - ( 1 )

[0053] in, [ Y ′...

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Abstract

The invention discloses a method for analyzing a fault of a micro electrical network containing a V / f control inversion type distributed power source. The method combines control strategies of a distributed power source with output characteristics, a fault equivalence model of the distributed power source is firstly brought forward, a fault node voltage equation of the micro electrical network containing the V / f control inversion type distributed power source is then established, solution is realized, and accurate fault analysis on the micro electrical network containing the V / f control inversion type distributed power source power is realized. According to the method, the control strategies of the distributed power source and the output characteristics are combined, the new transient equivalence model of the distributed power source is established, so fault current characteristics of the distributed power source can be more truly reflected; the micro electrical network fault analysis method is provided on the basis, improves accuracy of fault analysis, provides scientific bases for equipment type selection and protection setting of the micro electrical network containing the V / f control inversion type distributed power source and has quite strong practicality in engineering practice.

Description

technical field [0001] The invention relates to a fault analysis method of a power system, in particular to a fault analysis method of a micro-grid including a V / f control inverter type distributed power supply. Background technique [0002] The short-circuit current calculation of the microgrid under two different operating modes of grid-connected and island is an important basis for the establishment of microgrid protection. The existing fault analysis methods focus on the situation of the microgrid when it is connected to the grid, but do not consider the situation of the microgrid when it is operating in an island. When the microgrid is operating in an island, at least one DG adopts V / f control, and its fault characteristics are very different from those of the DG that adopts the PQ control strategy when connected to the grid, which leads to a great difference in the fault characteristics of the microgrid when it is operating in an island . In order to realize the faul...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/38
Inventor 李海锋曾德辉林跃欢蔡颖倩潘国清钟庆王钢
Owner SOUTH CHINA UNIV OF TECH
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