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Symmetric fault analyzing method containing inversion type distributed power distribution network

An inverter-type distributed and distributed power supply technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as large errors, single power supply of distribution network, and inability to use the equivalent model of voltage source

Inactive Publication Date: 2015-01-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The traditional distribution network has a single power supply and a simple structure. The existing symmetrical fault analysis method uses the voltage source model to equalize the system power supply and then solves the node voltage and branch current in the network.
However, with a large number of distributed power sources connected to the distribution network, the structure of the distribution network has undergone great changes; at the same time, because the output characteristics of the inverter distributed power source are completely different from the traditional synchronous motor type power source, the traditional voltage source cannot be used equivalence model
Therefore, the existing fault analysis methods will inevitably produce large errors

Method used

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  • Symmetric fault analyzing method containing inversion type distributed power distribution network
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Embodiment

[0035] This embodiment takes figure 1 The distribution network shown is taken as an example, and the fault analysis is carried out by adopting the symmetrical fault analysis method of the distributed power distribution network with inverter type according to the present invention, such as figure 2 shown, including the following steps:

[0036] S1 calculates the voltage amplitude U of the PCC during the normal operation of the distribution network PCC , including the following steps:

[0037] S11 obtains the node voltage equation during normal operation according to the distribution network equivalent diagram during normal operation:

[0038] [ Y ] U · = I ·

[0039] in, [ Y ] = Y 11 Y...

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Abstract

The invention discloses a symmetric fault analyzing method containing an inversion type distributed power distribution network. Combining a fault ride-through control strategy and an output characteristics of a distributed power supply, the method comprises the following steps of: firstly, calculating a voltage amplitude value UPCC of a public junction point PCC during normal operation of the power distribution network; building a solution equation group of a voltage amplitude value UPCC.f of the common junction point PCC when the power distribution network has a fault; and solving the UPCC.f to realize fault analysis of the inversion type distributed power distribution network. Compared with the prior art, the symmetric fault analyzing method has the advantage of accuracy of fault analysis.

Description

technical field [0001] The invention relates to a fault analysis method of a power system, in particular to a symmetrical fault analysis method of a distributed power distribution network with an inverter type. Background technique [0002] The traditional distribution network has a single power supply and a simple structure. The existing symmetrical fault analysis method is to use the voltage source model to equalize the system power supply and then solve the node voltage and branch current in the network. However, with a large number of distributed power sources connected to the distribution network, the structure of the distribution network has undergone great changes; at the same time, because the output characteristics of the inverter distributed power source are completely different from the traditional synchronous motor type power source, the traditional voltage source cannot be used equivalence model. Therefore, the existing fault analysis methods will inevitably pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 王钢吴争荣李海锋钟庆梁远升汪隆君潘国清高翔王辉
Owner SOUTH CHINA UNIV OF TECH
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