Fault processing method for unbalanced power distribution network containing inverter distributed power supply

An inverter-type distributed, fault-handling method technology, applied in the direction of AC networks, electrical components, circuit devices, etc. with the same frequency from different sources

Pending Publication Date: 2020-03-13
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies of the existing technology, the present invention provides a fault handling method for unbalanced distribution network with inverter-type distributed power supply to solve the problem of fault handling when distributed power supply is

Method used

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  • Fault processing method for unbalanced power distribution network containing inverter distributed power supply
  • Fault processing method for unbalanced power distribution network containing inverter distributed power supply
  • Fault processing method for unbalanced power distribution network containing inverter distributed power supply

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Embodiment

[0071] This embodiment takes figure 1 The distribution network shown is taken as an example, where 1 to 12 are nodes in the distribution network, the line from node 1 to node 2, the line from node 2 to node 3, the line from node 1 to node 6, and the line from node 1 to node The line from node 4, the line from node 4 to node 5, the line from node 6 to node 7, the line from node 7 to node 8, the line from node 6 to node 11, the line from node 6 to node 9, the line from node 9 to node 10 The lengths of the line and the line from node 9 to node 12 are 1km, 1km, 2km, 1km, 3km, 1.5km, 2km, 2.5km, 1km, 2km and 3km respectively; the line impedance Z 12 ,Z 23 ,Z 16 ,Z 14 ,Z 45 ,Z 67 ,Z 78 ,Z 611 ,Z 69 ,Z 910 ,Z 912 The calculation formula is as follows:

[0072] 0.13+j*0.356Ω / km;

[0073] Among them, load LD1: A phase: 2+j*0.5 / MVA, B phase: 1+j*0.4 / MVA, C phase: 0.5+j*0.1 / MVA; load LD2: A phase: 0.5+j*0.15 / MVA, Phase B: 1+j*0.4 / MVA, Phase C: 0.2+j*0.1 / MVA; Load LD3: Phase...

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Abstract

The invention discloses a fault processing method for an unbalanced power distribution network containing an inverter distributed power supply. The method comprises the following steps of inputting therequired parameters; setting the calculation error precision; forming an injection node current matrix; calculating a node voltage matrix in an active network; calculating a node voltage matrix ina passive network; calculating a post-fault node matrix; calculating the current outputted by each distributed power supply, an asymmetric line compensation current source and an asymmetric load compensation current source; taking the maximum difference value of the same node voltage as a calculation error, judging whether the calculation error is smaller than a set value or not, and if yes, outputting a calculation result; if not, recalculating from the current matrix forming the injection node; and optimizing the power distribution network according to the calculation result. The method is suitable for the fault processing of the complex power distribution network containing unbalanced elements, and is high in applicability and precision.

Description

technical field [0001] The invention belongs to the field of power system fault processing, and in particular relates to a fault processing method for an unbalanced distribution network including an inverter-type distributed power supply. Background technique [0002] In recent years, distributed power generation technology based on renewable energy has been rapidly developed and widely used. Distributed power can be divided into rotary type and inverter type according to its interface type. The output of rotating distributed power is similar to that of traditional generators, while the output of inverter distributed power is strongly nonlinear due to the influence of control strategies, so that the fault handling methods of traditional distribution networks are no longer applicable to Distribution network with inverter type distributed power supply [0003] On the other hand, system imbalance is a main feature of the distribution network. With the development and maturity...

Claims

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Application Information

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IPC IPC(8): H02J3/06H02J3/26H02J3/24H02H1/00
CPCH02J3/06H02J3/26H02J3/24H02H1/0007Y02E40/50Y04S10/52
Inventor 邓成江李海锋肖瑞超
Owner SOUTH CHINA UNIV OF TECH
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