Asymmetric fault analysis method for power distribution network including inverted distribution type power supply

An inverter-type distributed and asymmetric fault technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as inability to use the equivalent model of synchronous motors, large errors, etc.

Inactive Publication Date: 2013-01-16
SOUTH CHINA UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, the inverter distributed power supply is completely different from the traditional synchronous motor type power supply. Its output characteristics are completely determined by its control strategy under asymmetric fault conditions, and the traditional synchronous motor equivalent value cannot be used in positive and negative sequence networks. Model
Therefore, the existing fault analysis methods will inevitably produce large errors

Method used

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  • Asymmetric fault analysis method for power distribution network including inverted distribution type power supply
  • Asymmetric fault analysis method for power distribution network including inverted distribution type power supply
  • Asymmetric fault analysis method for power distribution network including inverted distribution type power supply

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Embodiment

[0036] This embodiment is based on figure 1 The shown power distribution network is taken as an example, and the asymmetric fault analysis method of the distributed power distribution network containing the inverter type of the present invention is used for fault analysis, such as figure 2 As shown, including the following steps:

[0037] S1 calculates the PCC voltage amplitude U during normal operation of the distribution network PCC , Specifically including the following steps:

[0038] S11 obtains the node voltage equation during normal operation according to the distribution network equivalent diagram during normal operation:

[0039] [ Y ] U · = I ·

[0040] The node voltage equation during normal operation in this embodiment is:

[0041] 1 Z s + 1 Z L 1 - 1 L 1 - 1 Z L 1 1 Z L 1 + 1 Z L 2 U · M U · PCC = E · ...

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Abstract

The invention discloses an asymmetric fault analysis method for a power distribution network including an inverted distribution type power supply. The asymmetric fault analysis method comprises the steps as follows: firstly, calculating a voltage amplitude value UPCC of a point of common coupling PCC when the power distribution network runs normally in combination with a fault through control strategy and an output characteristic of the distribution type power supply; and secondly, building an equation set of a positive sequence voltage amplitude value of the PCC when the power distribution network has a fault to calculate a positive sequence voltage of the PCC when the power distribution network has the fault so as to finish fault analysis of the power distribution network including the inverted distribution type power supply. Compared with the prior art, the accuracy of fault analysis is improved.

Description

Technical field [0001] The invention relates to a power system fault analysis method, in particular to an asymmetric fault analysis method of an inverter-type distributed power distribution network. Background technique [0002] The symmetrical component method is the most important method for asymmetric fault analysis. For traditional synchronous motors, the voltage source equivalent can be used in the positive sequence network, and the impedance equivalent can be used in the negative sequence network. However, the inverter-type distributed power supply is completely different from the traditional synchronous motor type power supply. Its output characteristics are completely determined by its control strategy under asymmetric fault conditions. The traditional synchronous motor equivalent cannot be used in the positive and negative sequence networks. model. Therefore, the existing failure analysis methods will inevitably produce larger errors. In order to realize the accurate a...

Claims

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Application Information

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Patent Type & Authority Applications(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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